Merge remote-tracking branch 'origin/master' into feature/esp32c6

.github/workflows/build.yml

@@ -15,6 +15,8 @@ env:
   OLDOLDOLDSTABLE_VERSION: 0.4
   QEMU_VERSION: 8.2.0
   QEMU_URL: https://download.qemu.org/qemu-8.2.0.tar.xz
+  QEMU_ESP: qemu_esp
+  QEMU_ESP_URL: https://github.com/espressif/qemu/releases/download/esp-develop-8.2.0-20240122/qemu-riscv32-softmmu-esp_develop_8.2.0_20240122-x86_64-linux-gnu.tar.xz
 
 jobs:
   # Run cargo xtask format-check
@@ -257,7 +259,7 @@ jobs:
         run: |
           sudo apt update
           sudo apt install -y qemu-system-arm qemu-system-riscv32
-          sudo apt-get install git libglib2.0-dev libfdt-dev libpixman-1-dev zlib1g-dev ninja-build
+          sudo apt install -y git libglib2.0-dev libfdt-dev libpixman-1-dev zlib1g-dev ninja-build
 
       - if: ${{ steps.cache-qemu.outputs.cache-hit != 'true' }}
         name: Download QEMU
@@ -277,8 +279,16 @@ jobs:
         name: Build QEMU
         run: |
           cd qemu-${{ env.QEMU_VERSION }}
-          make -j$(nproc)
+          ninja -C build
           
+      - name: Download ESP32 QEMU
+        run: wget "${{ env.QEMU_ESP_URL }}" --output-document=${{ env.QEMU_ESP}}.tar.xz
+
+      - name: Extract ESP32 QEMU
+        run: |
+          mkdir -p qemu-${{ env.QEMU_VERSION }}/build/esp32
+          tar --strip-components=1 -xvJf ${{ env.QEMU_ESP }}.tar.xz -C qemu-${{ env.QEMU_VERSION }}/build/esp32 qemu
+
       - name: Archive QEMU build
         run: |
           cd qemu-${{ env.QEMU_VERSION }}/build
@@ -413,6 +423,75 @@ jobs:
         if: ${{ matrix.backend != 'riscv32-imc-clint' }}
         run: cargo xtask --deny-warnings --platform hifive1 --backend ${{ matrix.backend }} qemu
 
+  # Platform esp32c3: verify the example output with run-pass tests
+  testexamplesesp32c3:
+    name: QEMU run (esp32c3)
+    needs: buildqemu
+    runs-on: ubuntu-22.04
+    strategy:
+      matrix:
+        toolchain:
+          - stable
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Install Rust ${{ matrix.toolchain }}
+        run: |
+          rustup set profile minimal
+          rustup override set ${{ matrix.toolchain }}
+
+      - name: Configure Rust target
+        run: |
+          rustup target add riscv32imac-unknown-none-elf
+          rustup target add riscv32imc-unknown-none-elf
+
+      - name: Add Rust component llvm-tools-preview
+        run: rustup component add llvm-tools-preview
+
+      - name: Install libudev espflash dependency
+        run: |
+          sudo apt update
+          sudo apt install -y libudev-dev
+
+      # Use precompiled binutils
+      - name: Install cargo-binutils
+        uses: taiki-e/install-action@v2
+        with:
+          tool: cargo-binutils
+
+      # Use precompiled if possible
+      - name: Install cargo-binutils
+        uses: taiki-e/install-action@v2
+        with:
+          tool: espflash
+
+      - name: Install esptool.py
+        run: pip install esptool
+
+      - name: Cache Dependencies
+        uses: Swatinem/rust-cache@v2
+
+      - name: Install QEMU to get dependencies
+        run: |
+          sudo apt update
+          sudo apt install -y qemu-system-riscv32
+
+      - name: Download built QEMU
+        uses: actions/download-artifact@v4
+        with:
+          name: qemu
+      
+      - name: Extract ESP32 QEMU into local path
+        run: sudo tar --strip-components=1 -xf qemu.tar -C /usr/local/ esp32/
+
+      - name: Check which QEMU is used
+        run: |
+          which qemu-system-riscv32
+      
+      - name: Run-pass tests
+        run: cargo xtask -v --platform esp32-c3 qemu
+
   # Run test suite
   tests:
     name: tests
@@ -720,7 +799,7 @@ jobs:
           tool: mdbook-mermaid
 
       - name: mdBook Action
-        uses: peaceiris/actions-mdbook@v1
+        uses: peaceiris/actions-mdbook@v2
         with:
           mdbook-version: 'latest'
 
@@ -831,7 +910,7 @@ jobs:
           tar -xf bookstodeploy.tar
 
       - name: Deploy to GH-pages
-        uses: peaceiris/actions-gh-pages@v3
+        uses: peaceiris/actions-gh-pages@v4
         with:
           github_token: ${{ secrets.GITHUB_TOKEN }}
           publish_dir: ./bookstodeploy
@@ -853,6 +932,7 @@ jobs:
       - checkexamplesesp32c6
       - testexampleslm3s6965
       - testexampleshifive1
+      - testexamplesesp32c3
       - tests
       - docs
       - mdbook

.gitignore

@@ -9,3 +9,4 @@ book-target/
 
 .DS_Store
 .vscode/
+qemu.log

ci/expected/esp32c3/sw_and_hw.run

@@ -0,0 +1,36 @@
+QEMU 8.2.0 monitor - type 'help' for more information
+(qemu) q
+ESP-ROM:esp32c3-api1-20210207
+Build:Feb  7 2021
+rst:0x1 (POWERON),boot:0x8 (SPI_FAST_FLASH_BOOT)
+SPIWP:0xee
+mode:DIO, clock div:2
+load:0x3fcd5820,len:0x1714
+load:0x403cc710,len:0x968
+load:0x403ce710,len:0x2f9c
+entry 0x403cc710
+I (0) boot: ESP-IDF v5.1.2-342-gbcf1645e44 2nd stage bootloader
+I (0) boot: compile time Dec 12 2023 10:50:58
+I (0) boot: chip revision: v0.3
+I (0) boot.esp32c3: SPI Speed      : 40MHz
+I (0) boot.esp32c3: SPI Mode       : SLOW READ
+I (0) boot.esp32c3: SPI Flash Size : 4MB
+I (0) boot: Enabling RNG early entropy source...
+I (1) boot: Partition Table:
+I (1) boot: ## Label            Usage          Type ST Offset   Length
+I (1) boot:  0 nvs              WiFi data        01 02 00009000 00006000
+I (1) boot:  1 phy_init         RF data          01 01 0000f000 00001000
+I (1) boot:  2 factory          factory app      00 00 00010000 003f0000
+I (1) boot: End of partition table
+I (1) esp_image: REDACTED
+I (3) esp_image: REDACTED
+I (3) esp_image: REDACTED
+I (8) esp_image: REDACTED
+I (11) boot: Loaded app from partition at offset 0x10000
+I (11) boot: Disabling RNG early entropy source...
+init
+Inside high prio task, press button now!
+Leaving high prio task.
+idle
+Inside low prio task, press button now!
+Leaving low prio task.

examples/embassy-stm32g4/src/bin/blinky.rs

@@ -5,9 +5,11 @@
 
 use embassy_stm32::gpio::{Level, Output, Speed};
 use rtic::app;
-use rtic_monotonics::systick::*;
+use rtic_monotonics::systick::prelude::*;
 use {defmt_rtt as _, panic_probe as _};
 
+systick_monotonic!(Mono, 1_000);
+
 pub mod pac {
     pub use embassy_stm32::pac::Interrupt as interrupt;
     pub use embassy_stm32::pac::*;
@@ -26,8 +28,7 @@ mod app {
     #[init]
     fn init(cx: init::Context) -> (Shared, Local) {
         // Initialize the systick interrupt & obtain the token to prove that we did
-        let systick_mono_token = rtic_monotonics::create_systick_token!();
-        Systick::start(cx.core.SYST, 25_000_000, systick_mono_token);
+        Mono::start(cx.core.SYST, 25_000_000);
 
         let p = embassy_stm32::init(Default::default());
         defmt::info!("Hello World!");
@@ -53,7 +54,7 @@ mod app {
                 led.set_low();
             }
             state = !state;
-            Systick::delay(1000.millis()).await;
+            Mono::delay(1000.millis()).await;
         }
     }
 }

examples/esp32c3/.cargo/config.toml

@@ -1,5 +1,9 @@
 [target.riscv32imc-unknown-none-elf]
-runner = "espflash flash --monitor"
+# Real hardware
+#runner = "espflash flash --monitor"
+
+# QEMU emulator
+runner = "./runner.sh"
 
 [build]
 rustflags = [

examples/esp32c3/runner.sh

@@ -0,0 +1,31 @@
+#!/bin/bash
+
+if [ $# -eq 0 ]
+  then
+    echo "No arguments supplied! Provide path to ELF as argument"
+fi
+
+outputfilenamecargo=$1
+outputfilename="$outputfilenamecargo".bin
+
+logfile=qemu.log
+
+qemuexec=qemu-system-riscv32
+
+# Building ESP32-C3 image
+espflash save-image --chip esp32c3 --merge "$outputfilenamecargo" "$outputfilename" 1>&2
+
+# Get stats
+esptool.py image_info --version 2 "$outputfilename" 1>&2
+
+# Run in QEMU
+$qemuexec -nographic -monitor tcp:127.0.0.1:55555,server,nowait -icount 3 -machine esp32c3 -drive file="$outputfilename",if=mtd,format=raw  -serial file:"$logfile" &
+
+# Let it run
+sleep 3s
+
+# Kill QEMU nicely by sending 'q' (quit) over tcp
+echo q | nc -N 127.0.0.1 55555
+# Output that will be compared, remove the esp_image segments as they change
+# between runs
+cat "$logfile" | sed 's/esp_image: .*$/esp_image: REDACTED/'

examples/lm3s6965/Cargo.lock

@@ -362,7 +362,6 @@ dependencies = [
  "critical-section",
  "rtic-core",
  "rtic-macros",
- "rtic-monotonics",
 ]
 
 [[package]]
@@ -392,12 +391,11 @@ dependencies = [
 
 [[package]]
 name = "rtic-monotonics"
-version = "1.5.0"
+version = "2.0.0"
 dependencies = [
  "atomic-polyfill",
  "cfg-if",
  "cortex-m",
- "embedded-hal 1.0.0",
  "fugit",
  "rtic-time",
 ]
@@ -417,9 +415,12 @@ dependencies = [
 
 [[package]]
 name = "rtic-time"
-version = "1.3.0"
+version = "2.0.0"
 dependencies = [
  "critical-section",
+ "embedded-hal 1.0.0",
+ "embedded-hal-async",
+ "fugit",
  "futures-util",
  "rtic-common",
 ]

examples/lm3s6965/examples/async-delay.rs

@@ -11,7 +11,9 @@ use panic_semihosting as _;
 #[rtic::app(device = lm3s6965, dispatchers = [SSI0, UART0], peripherals = true)]
 mod app {
     use cortex_m_semihosting::{debug, hprintln};
-    use rtic_monotonics::systick::*;
+    use rtic_monotonics::systick::prelude::*;
+
+    systick_monotonic!(Mono, 100);
 
     #[shared]
     struct Shared {}
@@ -23,8 +25,7 @@ mod app {
     fn init(cx: init::Context) -> (Shared, Local) {
         hprintln!("init");
 
-        let systick_token = rtic_monotonics::create_systick_token!();
-        Systick::start(cx.core.SYST, 12_000_000, systick_token);
+        Mono::start(cx.core.SYST, 12_000_000);
 
         foo::spawn().ok();
         bar::spawn().ok();
@@ -36,21 +37,21 @@ mod app {
     #[task]
     async fn foo(_cx: foo::Context) {
         hprintln!("hello from foo");
-        Systick::delay(100.millis()).await;
+        Mono::delay(100.millis()).await;
         hprintln!("bye from foo");
     }
 
     #[task]
     async fn bar(_cx: bar::Context) {
         hprintln!("hello from bar");
-        Systick::delay(200.millis()).await;
+        Mono::delay(200.millis()).await;
         hprintln!("bye from bar");
     }
 
     #[task]
     async fn baz(_cx: baz::Context) {
         hprintln!("hello from baz");
-        Systick::delay(300.millis()).await;
+        Mono::delay(300.millis()).await;
         hprintln!("bye from baz");
 
         debug::exit(debug::EXIT_SUCCESS);

examples/lm3s6965/examples/async-timeout.rs

@@ -8,13 +8,13 @@
 
 use cortex_m_semihosting::{debug, hprintln};
 use panic_semihosting as _;
-use rtic_monotonics::systick::*;
+use rtic_monotonics::systick::prelude::*;
+systick_monotonic!(Mono, 100);
 
 #[rtic::app(device = lm3s6965, dispatchers = [SSI0, UART0], peripherals = true)]
 mod app {
     use super::*;
     use futures::{future::FutureExt, select_biased};
-    use rtic_monotonics::Monotonic;
 
     #[shared]
     struct Shared {}
@@ -27,8 +27,7 @@ mod app {
     fn init(cx: init::Context) -> (Shared, Local) {
         hprintln!("init");
 
-        let systick_token = rtic_monotonics::create_systick_token!();
-        Systick::start(cx.core.SYST, 12_000_000, systick_token);
+        Mono::start(cx.core.SYST, 12_000_000);
         // ANCHOR_END: init
 
         foo::spawn().ok();
@@ -42,19 +41,19 @@ mod app {
         // Call hal with short relative timeout using `select_biased`
         select_biased! {
             v = hal_get(1).fuse() => hprintln!("hal returned {}", v),
-            _ = Systick::delay(200.millis()).fuse() =>  hprintln!("timeout", ), // this will finish first
+            _ = Mono::delay(200.millis()).fuse() =>  hprintln!("timeout", ), // this will finish first
         }
 
         // Call hal with long relative timeout using `select_biased`
         select_biased! {
             v = hal_get(1).fuse() => hprintln!("hal returned {}", v), // hal finish first
-            _ = Systick::delay(1000.millis()).fuse() =>  hprintln!("timeout", ),
+            _ = Mono::delay(1000.millis()).fuse() =>  hprintln!("timeout", ),
         }
         // ANCHOR_END: select_biased
 
         // ANCHOR: timeout_after_basic
         // Call hal with long relative timeout using monotonic `timeout_after`
-        match Systick::timeout_after(1000.millis(), hal_get(1)).await {
+        match Mono::timeout_after(1000.millis(), hal_get(1)).await {
             Ok(v) => hprintln!("hal returned {}", v),
             _ => hprintln!("timeout"),
         }
@@ -62,20 +61,20 @@ mod app {
 
         // ANCHOR: timeout_at_basic
         // get the current time instance
-        let mut instant = Systick::now();
+        let mut instant = Mono::now();
 
         // do this 3 times
         for n in 0..3 {
             // absolute point in time without drift
             instant += 1000.millis();
-            Systick::delay_until(instant).await;
+            Mono::delay_until(instant).await;
 
             // absolute point in time for timeout
             let timeout = instant + 500.millis();
-            hprintln!("now is {:?}, timeout at {:?}", Systick::now(), timeout);
+            hprintln!("now is {:?}, timeout at {:?}", Mono::now(), timeout);
 
-            match Systick::timeout_at(timeout, hal_get(n)).await {
-                Ok(v) => hprintln!("hal returned {} at time {:?}", v, Systick::now()),
+            match Mono::timeout_at(timeout, hal_get(n)).await {
+                Ok(v) => hprintln!("hal returned {} at time {:?}", v, Mono::now()),
                 _ => hprintln!("timeout"),
             }
         }
@@ -90,7 +89,7 @@ async fn hal_get(n: u32) -> u32 {
     // emulate some delay time dependent on n
     let d = 350.millis() + n * 100.millis();
     hprintln!("the hal takes a duration of {:?}", d);
-    Systick::delay(d).await;
+    Mono::delay(d).await;
     // emulate some return value
     5
 }

examples/nrf52840_blinky/Cargo.lock

@@ -136,7 +136,7 @@ dependencies = [
  "proc-macro-error",
  "proc-macro2",
  "quote",
- "syn 2.0.39",
+ "syn 2.0.51",
 ]
 
 [[package]]
@@ -179,9 +179,18 @@ dependencies = [
 
 [[package]]
 name = "embedded-hal"
-version = "1.0.0-rc.2"
+version = "1.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3e57ec6ad0bc8eb967cf9c9f144177f5e8f2f6f02dad0b8b683f9f05f6b22def"
+checksum = "361a90feb7004eca4019fb28352a9465666b24f840f5c3cddf0ff13920590b89"
+
+[[package]]
+name = "embedded-hal-async"
+version = "1.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0c4c685bbef7fe13c3c6dd4da26841ed3980ef33e841cddfa15ce8a8fb3f1884"
+dependencies = [
+ "embedded-hal 1.0.0",
+]
 
 [[package]]
 name = "embedded-storage"
@@ -412,18 +421,18 @@ dependencies = [
 
 [[package]]
 name = "proc-macro2"
-version = "1.0.70"
+version = "1.0.78"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "39278fbbf5fb4f646ce651690877f89d1c5811a3d4acb27700c1cb3cdb78fd3b"
+checksum = "e2422ad645d89c99f8f3e6b88a9fdeca7fabeac836b1002371c4367c8f984aae"
 dependencies = [
  "unicode-ident",
 ]
 
 [[package]]
 name = "quote"
-version = "1.0.33"
+version = "1.0.35"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5267fca4496028628a95160fc423a33e8b2e6af8a5302579e322e4b520293cae"
+checksum = "291ec9ab5efd934aaf503a6466c5d5251535d108ee747472c3977cc5acc868ef"
 dependencies = [
  "proc-macro2",
 ]
@@ -468,18 +477,18 @@ dependencies = [
  "proc-macro-error",
  "proc-macro2",
  "quote",
- "syn 1.0.109",
+ "syn 2.0.51",
 ]
 
 [[package]]
 name = "rtic-monotonics"
-version = "1.4.0"
+version = "2.0.0"
 dependencies = [
  "atomic-polyfill",
  "cfg-if",
  "cortex-m",
  "critical-section",
- "embedded-hal 1.0.0-rc.2",
+ "embedded-hal 1.0.0",
  "fugit",
  "nrf52840-pac",
  "rtic-time",
@@ -487,9 +496,12 @@ dependencies = [
 
 [[package]]
 name = "rtic-time"
-version = "1.1.0"
+version = "2.0.0"
 dependencies = [
  "critical-section",
+ "embedded-hal 1.0.0",
+ "embedded-hal-async",
+ "fugit",
  "futures-util",
  "rtic-common",
 ]
@@ -537,9 +549,9 @@ dependencies = [
 
 [[package]]
 name = "syn"
-version = "2.0.39"
+version = "2.0.51"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "23e78b90f2fcf45d3e842032ce32e3f2d1545ba6636271dcbf24fa306d87be7a"
+checksum = "6ab617d94515e94ae53b8406c628598680aa0c9587474ecbe58188f7b345d66c"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -563,7 +575,7 @@ checksum = "266b2e40bc00e5a6c09c3584011e08b06f123c00362c92b975ba9843aaaa14b8"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.39",
+ "syn 2.0.51",
 ]
 
 [[package]]

examples/nrf52840_blinky/Cargo.toml

@@ -26,7 +26,7 @@ features = ["thumbv7-backend"]
 
 [dependencies.rtic-monotonics]
 path = "../../rtic-monotonics"
-version = "1.4.0"
+version = "2.0.0"
 features = ["nrf52840"]
 
 # cargo build/run

examples/nrf52840_blinky/src/bin/blinky_rtc.rs

@@ -5,6 +5,9 @@
 
 use nrf52840_blinky::hal;
 
+use rtic_monotonics::nrf::rtc::prelude::*;
+nrf_rtc0_monotonic!(Mono);
+
 #[rtic::app(device = hal::pac, dispatchers = [SWI0_EGU0])]
 mod app {
     use super::*;
@@ -12,10 +15,6 @@ mod app {
     use hal::gpio::{Level, Output, Pin, PushPull};
     use hal::prelude::*;
 
-    use rtic_monotonics::nrf::rtc::Rtc0 as Mono;
-    use rtic_monotonics::nrf::rtc::*;
-    use rtic_monotonics::Monotonic;
-
     #[shared]
     struct Shared {}
 
@@ -30,8 +29,7 @@ mod app {
         hal::clocks::Clocks::new(cx.device.CLOCK).start_lfclk();
 
         // Initialize Monotonic
-        let token = rtic_monotonics::create_nrf_rtc0_monotonic_token!();
-        Mono::start(cx.device.RTC0, token);
+        Mono::start(cx.device.RTC0);
 
         // Setup LED
         let port0 = hal::gpio::p0::Parts::new(cx.device.P0);

examples/nrf52840_blinky/src/bin/blinky_timer.rs

@@ -5,6 +5,9 @@
 
 use nrf52840_blinky::hal;
 
+use rtic_monotonics::nrf::timer::prelude::*;
+nrf_timer0_monotonic!(Mono, 8_000_000);
+
 #[rtic::app(device = hal::pac, dispatchers = [SWI0_EGU0])]
 mod app {
     use super::*;
@@ -12,10 +15,6 @@ mod app {
     use hal::gpio::{Level, Output, Pin, PushPull};
     use hal::prelude::*;
 
-    use rtic_monotonics::nrf::timer::Timer0 as Mono;
-    use rtic_monotonics::nrf::timer::*;
-    use rtic_monotonics::Monotonic;
-
     #[shared]
     struct Shared {}
 
@@ -27,8 +26,7 @@ mod app {
     #[init]
     fn init(cx: init::Context) -> (Shared, Local) {
         // Initialize Monotonic
-        let token = rtic_monotonics::create_nrf_timer0_monotonic_token!();
-        Mono::start(cx.device.TIMER0, token);
+        Mono::start(cx.device.TIMER0);
 
         // Setup LED
         let port0 = hal::gpio::p0::Parts::new(cx.device.P0);

examples/rp2040_local_i2c_init/Cargo.lock

@@ -10,9 +10,9 @@ checksum = "96d30a06541fbafbc7f82ed10c06164cfbd2c401138f6addd8404629c4b16711"
 
 [[package]]
 name = "atomic-polyfill"
-version = "1.0.2"
+version = "1.0.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c314e70d181aa6053b26e3f7fbf86d1dfff84f816a6175b967666b3506ef7289"
+checksum = "8cf2bce30dfe09ef0bfaef228b9d414faaf7e563035494d7fe092dba54b300f4"
 dependencies = [
  "critical-section",
 ]
@@ -52,7 +52,7 @@ checksum = "8ec610d8f49840a5b376c69663b6369e71f4b34484b9b2eb29fb918d92516cb9"
 dependencies = [
  "bare-metal 0.2.5",
  "bitfield",
- "embedded-hal",
+ "embedded-hal 0.2.7",
  "volatile-register",
 ]
 
@@ -73,23 +73,23 @@ checksum = "f0f6f3e36f203cfedbc78b357fb28730aa2c6dc1ab060ee5c2405e843988d3c7"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn",
+ "syn 1.0.109",
 ]
 
 [[package]]
 name = "crc-any"
-version = "2.4.3"
+version = "2.4.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "774646b687f63643eb0f4bf13dc263cb581c8c9e57973b6ddf78bda3994d88df"
+checksum = "c01a5e1f881f6fb6099a7bdf949e946719fd4f1fefa56264890574febf0eb6d0"
 dependencies = [
  "debug-helper",
 ]
 
 [[package]]
 name = "critical-section"
-version = "1.1.1"
+version = "1.1.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6548a0ad5d2549e111e1f6a11a6c2e2d00ce6a3dafe22948d67c2b443f775e52"
+checksum = "7059fff8937831a9ae6f0fe4d658ffabf58f2ca96aa9dec1c889f936f705f216"
 
 [[package]]
 name = "debug-helper"
@@ -99,9 +99,9 @@ checksum = "f578e8e2c440e7297e008bb5486a3a8a194775224bbc23729b0dbdfaeebf162e"
 
 [[package]]
 name = "either"
-version = "1.8.1"
+version = "1.10.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7fcaabb2fef8c910e7f4c7ce9f67a1283a1715879a7c230ca9d6d1ae31f16d91"
+checksum = "11157ac094ffbdde99aa67b23417ebdd801842852b500e395a45a9c0aac03e4a"
 
 [[package]]
 name = "embedded-dma"
@@ -123,10 +123,64 @@ dependencies = [
 ]
 
 [[package]]
-name = "equivalent"
+name = "embedded-hal"
 version = "1.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "88bffebc5d80432c9b140ee17875ff173a8ab62faad5b257da912bd2f6c1c0a1"
+checksum = "361a90feb7004eca4019fb28352a9465666b24f840f5c3cddf0ff13920590b89"
+
+[[package]]
+name = "embedded-hal-async"
+version = "1.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0c4c685bbef7fe13c3c6dd4da26841ed3980ef33e841cddfa15ce8a8fb3f1884"
+dependencies = [
+ "embedded-hal 1.0.0",
+]
+
+[[package]]
+name = "equivalent"
+version = "1.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5443807d6dff69373d433ab9ef5378ad8df50ca6298caf15de6e52e24aaf54d5"
+
+[[package]]
+name = "frunk"
+version = "0.4.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "11a351b59e12f97b4176ee78497dff72e4276fb1ceb13e19056aca7fa0206287"
+dependencies = [
+ "frunk_core",
+ "frunk_derives",
+]
+
+[[package]]
+name = "frunk_core"
+version = "0.4.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "af2469fab0bd07e64ccf0ad57a1438f63160c69b2e57f04a439653d68eb558d6"
+
+[[package]]
+name = "frunk_derives"
+version = "0.4.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b0fa992f1656e1707946bbba340ad244f0814009ef8c0118eb7b658395f19a2e"
+dependencies = [
+ "frunk_proc_macro_helpers",
+ "quote",
+ "syn 2.0.51",
+]
+
+[[package]]
+name = "frunk_proc_macro_helpers"
+version = "0.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "35b54add839292b743aeda6ebedbd8b11e93404f902c56223e51b9ec18a13d2c"
+dependencies = [
+ "frunk_core",
+ "proc-macro2",
+ "quote",
+ "syn 2.0.51",
+]
 
 [[package]]
 name = "fugit"
@@ -139,21 +193,21 @@ dependencies = [
 
 [[package]]
 name = "futures-core"
-version = "0.3.28"
+version = "0.3.30"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4bca583b7e26f571124fe5b7561d49cb2868d79116cfa0eefce955557c6fee8c"
+checksum = "dfc6580bb841c5a68e9ef15c77ccc837b40a7504914d52e47b8b0e9bbda25a1d"
 
 [[package]]
 name = "futures-task"
-version = "0.3.28"
+version = "0.3.30"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "76d3d132be6c0e6aa1534069c705a74a5997a356c0dc2f86a47765e5617c5b65"
+checksum = "38d84fa142264698cdce1a9f9172cf383a0c82de1bddcf3092901442c4097004"
 
 [[package]]
 name = "futures-util"
-version = "0.3.28"
+version = "0.3.30"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "26b01e40b772d54cf6c6d721c1d1abd0647a0106a12ecaa1c186273392a69533"
+checksum = "3d6401deb83407ab3da39eba7e33987a73c3df0c82b4bb5813ee871c19c41d48"
 dependencies = [
  "futures-core",
  "futures-task",
@@ -169,15 +223,15 @@ checksum = "1d758ba1b47b00caf47f24925c0074ecb20d6dfcffe7f6d53395c0465674841a"
 
 [[package]]
 name = "hashbrown"
-version = "0.14.0"
+version = "0.14.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2c6201b9ff9fd90a5a3bac2e56a830d0caa509576f0e503818ee82c181b3437a"
+checksum = "290f1a1d9242c78d09ce40a5e87e7554ee637af1351968159f4952f028f75604"
 
 [[package]]
 name = "indexmap"
-version = "2.0.0"
+version = "2.2.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d5477fe2230a79769d8dc68e0eabf5437907c0457a5614a9e8dddb67f65eb65d"
+checksum = "233cf39063f058ea2caae4091bf4a3ef70a653afbc026f5c4a4135d114e3c177"
 dependencies = [
  "equivalent",
  "hashbrown",
@@ -224,7 +278,7 @@ checksum = "dcbff9bc912032c62bf65ef1d5aea88983b420f4f839db1e9b0c281a25c9c799"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn",
+ "syn 1.0.109",
 ]
 
 [[package]]
@@ -238,15 +292,15 @@ dependencies = [
 
 [[package]]
 name = "paste"
-version = "1.0.12"
+version = "1.0.14"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9f746c4065a8fa3fe23974dd82f15431cc8d40779821001404d10d2e79ca7d79"
+checksum = "de3145af08024dea9fa9914f381a17b8fc6034dfb00f3a84013f7ff43f29ed4c"
 
 [[package]]
 name = "pin-project-lite"
-version = "0.2.9"
+version = "0.2.13"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e0a7ae3ac2f1173085d398531c705756c94a4c56843785df85a60c1a0afac116"
+checksum = "8afb450f006bf6385ca15ef45d71d2288452bc3683ce2e2cacc0d18e4be60b58"
 
 [[package]]
 name = "pin-utils"
@@ -265,6 +319,12 @@ dependencies = [
  "paste",
 ]
 
+[[package]]
+name = "portable-atomic"
+version = "1.6.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7170ef9988bc169ba16dd36a7fa041e5c4cbeb6a35b76d4c03daded371eae7c0"
+
 [[package]]
 name = "proc-macro-error"
 version = "1.0.4"
@@ -274,7 +334,7 @@ dependencies = [
  "proc-macro-error-attr",
  "proc-macro2",
  "quote",
- "syn",
+ "syn 1.0.109",
  "version_check",
 ]
 
@@ -291,18 +351,18 @@ dependencies = [
 
 [[package]]
 name = "proc-macro2"
-version = "1.0.63"
+version = "1.0.78"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7b368fba921b0dce7e60f5e04ec15e565b3303972b42bcfde1d0713b881959eb"
+checksum = "e2422ad645d89c99f8f3e6b88a9fdeca7fabeac836b1002371c4367c8f984aae"
 dependencies = [
  "unicode-ident",
 ]
 
 [[package]]
 name = "quote"
-version = "1.0.29"
+version = "1.0.35"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "573015e8ab27661678357f27dc26460738fd2b6c86e46f386fde94cb5d913105"
+checksum = "291ec9ab5efd934aaf503a6466c5d5251535d108ee747472c3977cc5acc868ef"
 dependencies = [
  "proc-macro2",
 ]
@@ -315,11 +375,10 @@ checksum = "ec0be4795e2f6a28069bec0b5ff3e2ac9bafc99e6a9a7dc3547996c5c816922c"
 
 [[package]]
 name = "rp-pico"
-version = "0.7.0"
+version = "0.8.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "aab28f6f4e19cec2d61b64cdd685e69794b81c579fd3b765579c46018fe616d0"
+checksum = "6341771e6f8e5d130b2b3cbc23435b7847761adf198af09f4b2a60407d43bd56"
 dependencies = [
- "cortex-m",
  "cortex-m-rt",
  "fugit",
  "rp2040-boot2",
@@ -329,23 +388,24 @@ dependencies = [
 
 [[package]]
 name = "rp2040-boot2"
-version = "0.2.1"
+version = "0.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3c773ec49b836077aa144b58dc7654a243e1eecdb6cf0d25361ae7c7600fabd8"
+checksum = "7c92f344f63f950ee36cf4080050e4dce850839b9175da38f9d2ffb69b4dbb21"
 dependencies = [
  "crc-any",
 ]
 
 [[package]]
 name = "rp2040-hal"
-version = "0.8.2"
+version = "0.9.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1369bb84862d7f69391a96606b2f29a00bfce7f29a749e23d5f01fc3f607ada0"
+checksum = "1ff2b9ae7e6dd6720fd9f64250c9087260e50fe98b6b032ccca65be3581167ca"
 dependencies = [
  "cortex-m",
  "critical-section",
  "embedded-dma",
- "embedded-hal",
+ "embedded-hal 0.2.7",
+ "frunk",
  "fugit",
  "itertools",
  "nb 1.1.0",
@@ -368,17 +428,18 @@ dependencies = [
  "cortex-m-rt",
  "proc-macro2",
  "quote",
- "syn",
+ "syn 1.0.109",
 ]
 
 [[package]]
 name = "rp2040-pac"
-version = "0.4.0"
+version = "0.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9192cafbb40d717c9e0ddf767aaf9c69fee1b4e48d22ed853b57b11f6d9f3d7e"
+checksum = "12d9d8375815f543f54835d01160d4e47f9e2cae75f17ff8f1ec19ce1da96e4c"
 dependencies = [
  "cortex-m",
  "cortex-m-rt",
+ "critical-section",
  "vcell",
 ]
 
@@ -387,7 +448,7 @@ name = "rp2040_local_i2c_init"
 version = "0.1.0"
 dependencies = [
  "cortex-m",
- "embedded-hal",
+ "embedded-hal 0.2.7",
  "fugit",
  "panic-probe",
  "rp-pico",
@@ -397,7 +458,7 @@ dependencies = [
 
 [[package]]
 name = "rtic"
-version = "2.0.0"
+version = "2.0.1"
 dependencies = [
  "atomic-polyfill",
  "bare-metal 1.0.0",
@@ -409,9 +470,10 @@ dependencies = [
 
 [[package]]
 name = "rtic-common"
-version = "1.0.0"
+version = "1.0.1"
 dependencies = [
  "critical-section",
+ "portable-atomic",
 ]
 
 [[package]]
@@ -422,22 +484,23 @@ checksum = "d9369355b04d06a3780ec0f51ea2d225624db777acbc60abd8ca4832da5c1a42"
 
 [[package]]
 name = "rtic-macros"
-version = "2.0.0"
+version = "2.0.1"
 dependencies = [
  "indexmap",
  "proc-macro-error",
  "proc-macro2",
  "quote",
- "syn",
+ "syn 2.0.51",
 ]
 
 [[package]]
 name = "rtic-monotonics"
-version = "1.0.0"
+version = "2.0.0"
 dependencies = [
  "atomic-polyfill",
  "cfg-if",
  "cortex-m",
+ "embedded-hal 1.0.0",
  "fugit",
  "rp2040-pac",
  "rtic-time",
@@ -445,9 +508,12 @@ dependencies = [
 
 [[package]]
 name = "rtic-time"
-version = "1.0.0"
+version = "2.0.0"
 dependencies = [
  "critical-section",
+ "embedded-hal 1.0.0",
+ "embedded-hal-async",
+ "fugit",
  "futures-util",
  "rtic-common",
 ]
@@ -494,10 +560,21 @@ dependencies = [
 ]
 
 [[package]]
-name = "unicode-ident"
-version = "1.0.9"
+name = "syn"
+version = "2.0.51"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b15811caf2415fb889178633e7724bad2509101cde276048e013b9def5e51fa0"
+checksum = "6ab617d94515e94ae53b8406c628598680aa0c9587474ecbe58188f7b345d66c"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "unicode-ident",
+]
+
+[[package]]
+name = "unicode-ident"
+version = "1.0.12"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3354b9ac3fae1ff6755cb6db53683adb661634f67557942dea4facebec0fee4b"
 
 [[package]]
 name = "usb-device"
@@ -525,9 +602,9 @@ checksum = "6a02e4885ed3bc0f2de90ea6dd45ebcbb66dacffe03547fadbb0eeae2770887d"
 
 [[package]]
 name = "volatile-register"
-version = "0.2.1"
+version = "0.2.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9ee8f19f9d74293faf70901bc20ad067dc1ad390d2cbf1e3f75f721ffee908b6"
+checksum = "de437e2a6208b014ab52972a27e59b33fa2920d3e00fe05026167a1c509d19cc"
 dependencies = [
  "vcell",
 ]

examples/rp2040_local_i2c_init/Cargo.toml

@@ -15,14 +15,14 @@ features = ["thumbv6-backend"]
 
 [dependencies.rtic-monotonics]
 path = "../../rtic-monotonics"
-version = "1.0.0"
+version = "2.0.0"
 features = ["rp2040"]
 
 [dependencies]
 cortex-m = "0.7"
 embedded-hal = { version = "0.2.7", features = ["unproven"] }
 fugit = "0.3"
-rp-pico = "0.7.0"
+rp-pico = "0.8.0"
 panic-probe = "0.3"
 
 [profile.dev]

examples/rp2040_local_i2c_init/src/main.rs

@@ -1,15 +1,21 @@
 #![no_std]
 #![no_main]
 
-#[rtic::app(
-    device = rp_pico::hal::pac,
-    dispatchers = [TIMER_IRQ_1]
-)]
+use rtic_monotonics::rp2040::prelude::*;
+
+rp2040_timer_monotonic!(Mono);
+
+#[rtic::app(device = rp_pico::hal::pac)]
 mod app {
+    use super::*;
+
     use rp_pico::hal::{
-        clocks, gpio,
-        gpio::pin::bank0::{Gpio2, Gpio25, Gpio3},
-        gpio::pin::PushPullOutput,
+        clocks,
+        gpio::{
+            self,
+            bank0::{Gpio2, Gpio25, Gpio3},
+            FunctionSioOutput, PullNone, PullUp,
+        },
         pac,
         sio::Sio,
         watchdog::Watchdog,
@@ -20,15 +26,13 @@ mod app {
     use core::mem::MaybeUninit;
     use embedded_hal::digital::v2::{OutputPin, ToggleableOutputPin};
     use fugit::RateExtU32;
-    use rtic_monotonics::rp2040::*;
-
     use panic_probe as _;
 
     type I2CBus = I2C<
         pac::I2C1,
         (
-            gpio::Pin<Gpio2, gpio::FunctionI2C>,
-            gpio::Pin<Gpio3, gpio::FunctionI2C>,
+            gpio::Pin<Gpio2, gpio::FunctionI2C, PullUp>,
+            gpio::Pin<Gpio3, gpio::FunctionI2C, PullUp>,
         ),
     >;
 
@@ -37,7 +41,7 @@ mod app {
 
     #[local]
     struct Local {
-        led: gpio::Pin<Gpio25, PushPullOutput>,
+        led: gpio::Pin<Gpio25, FunctionSioOutput, PullNone>,
         i2c: &'static mut I2CBus,
     }
 
@@ -48,11 +52,8 @@ mod app {
         i2c_ctx: MaybeUninit<I2CBus> = MaybeUninit::uninit()
     ])]
     fn init(mut ctx: init::Context) -> (Shared, Local) {
-        // Initialize the interrupt for the RP2040 timer and obtain the token
-        // proving that we have.
-        let rp2040_timer_token = rtic_monotonics::create_rp2040_monotonic_token!();
         // Configure the clocks, watchdog - The default is to generate a 125 MHz system clock
-        Timer::start(ctx.device.TIMER, &mut ctx.device.RESETS, rp2040_timer_token); // default rp2040 clock-rate is 125MHz
+        Mono::start(ctx.device.TIMER, &mut ctx.device.RESETS); // default rp2040 clock-rate is 125MHz
         let mut watchdog = Watchdog::new(ctx.device.WATCHDOG);
         let clocks = clocks::init_clocks_and_plls(
             XOSC_CRYSTAL_FREQ,
@@ -74,12 +75,21 @@ mod app {
             sio.gpio_bank0,
             &mut ctx.device.RESETS,
         );
-        let mut led = gpioa.led.into_push_pull_output();
+        let mut led = gpioa
+            .led
+            .into_pull_type::<PullNone>()
+            .into_push_pull_output();
         led.set_low().unwrap();
 
         // Init I2C pins
-        let sda_pin = gpioa.gpio2.into_mode::<gpio::FunctionI2C>();
-        let scl_pin = gpioa.gpio3.into_mode::<gpio::FunctionI2C>();
+        let sda_pin = gpioa
+            .gpio2
+            .into_pull_up_disabled()
+            .into_function::<gpio::FunctionI2C>();
+        let scl_pin = gpioa
+            .gpio3
+            .into_pull_up_disabled()
+            .into_function::<gpio::FunctionI2C>();
 
         // Init I2C itself, using MaybeUninit to overwrite the previously
         // uninitialized i2c_ctx variable without dropping its value
@@ -118,7 +128,7 @@ mod app {
             // now to do something with it!
 
             // Delay for 1 second
-            Timer::delay(1000.millis()).await;
+            Mono::delay(1000.millis()).await;
         }
     }
 }

examples/stm32f3_blinky/Cargo.lock

@@ -52,11 +52,12 @@ checksum = "bef38d45163c2f1dde094a7dfd33ccf595c92905c8f8f4fdc18d06fb1037718a"
 
 [[package]]
 name = "bxcan"
-version = "0.6.2"
+version = "0.7.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4b13b4b2ea9ab2ba924063ebb86ad895cb79f4a79bf90f27949eb20c335b30f9"
+checksum = "40ac3d0c0a542d0ab5521211f873f62706a7136df415676f676d347e5a41dd80"
 dependencies = [
  "bitflags",
+ "embedded-hal 0.2.7",
  "nb 1.1.0",
  "vcell",
 ]
@@ -86,7 +87,7 @@ dependencies = [
  "bare-metal 0.2.5",
  "bitfield",
  "critical-section",
- "embedded-hal",
+ "embedded-hal 0.2.7",
  "volatile-register",
 ]
 
@@ -112,9 +113,9 @@ dependencies = [
 
 [[package]]
 name = "critical-section"
-version = "1.1.1"
+version = "1.1.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6548a0ad5d2549e111e1f6a11a6c2e2d00ce6a3dafe22948d67c2b443f775e52"
+checksum = "7059fff8937831a9ae6f0fe4d658ffabf58f2ca96aa9dec1c889f936f705f216"
 
 [[package]]
 name = "darling"
@@ -136,7 +137,7 @@ dependencies = [
  "ident_case",
  "proc-macro2",
  "quote",
- "syn 2.0.22",
+ "syn 2.0.50",
 ]
 
 [[package]]
@@ -147,7 +148,7 @@ checksum = "29a358ff9f12ec09c3e61fef9b5a9902623a695a46a917b07f269bff1445611a"
 dependencies = [
  "darling_core",
  "quote",
- "syn 2.0.22",
+ "syn 2.0.50",
 ]
 
 [[package]]
@@ -169,6 +170,21 @@ dependencies = [
  "void",
 ]
 
+[[package]]
+name = "embedded-hal"
+version = "1.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "361a90feb7004eca4019fb28352a9465666b24f840f5c3cddf0ff13920590b89"
+
+[[package]]
+name = "embedded-hal-async"
+version = "1.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0c4c685bbef7fe13c3c6dd4da26841ed3980ef33e841cddfa15ce8a8fb3f1884"
+dependencies = [
+ "embedded-hal 1.0.0",
+]
+
 [[package]]
 name = "embedded-time"
 version = "0.12.1"
@@ -180,9 +196,9 @@ dependencies = [
 
 [[package]]
 name = "enumset"
-version = "1.1.2"
+version = "1.1.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e875f1719c16de097dee81ed675e2d9bb63096823ed3f0ca827b7dea3028bbbb"
+checksum = "226c0da7462c13fb57e5cc9e0dc8f0635e7d27f276a3a7fd30054647f669007d"
 dependencies = [
  "enumset_derive",
 ]
@@ -196,7 +212,7 @@ dependencies = [
  "darling",
  "proc-macro2",
  "quote",
- "syn 2.0.22",
+ "syn 2.0.50",
 ]
 
 [[package]]
@@ -343,28 +359,28 @@ dependencies = [
 
 [[package]]
 name = "num-traits"
-version = "0.2.15"
+version = "0.2.18"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "578ede34cf02f8924ab9447f50c28075b4d3e5b269972345e7e0372b38c6cdcd"
+checksum = "da0df0e5185db44f69b44f26786fe401b6c293d1907744beaa7fa62b2e5a517a"
 dependencies = [
  "autocfg",
 ]
 
 [[package]]
 name = "panic-rtt-target"
-version = "0.1.2"
+version = "0.1.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0d6ab67bc881453e4c90f958c657c1303670ea87bc1a16e87fd71a40f656dce9"
+checksum = "608d1d809dd8960d5e8364981279c7ab280a13d98b99eae049885a7ab2b1cbfe"
 dependencies = [
- "cortex-m",
- "rtt-target 0.3.1",
+ "critical-section",
+ "rtt-target",
 ]
 
 [[package]]
 name = "paste"
-version = "1.0.12"
+version = "1.0.14"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9f746c4065a8fa3fe23974dd82f15431cc8d40779821001404d10d2e79ca7d79"
+checksum = "de3145af08024dea9fa9914f381a17b8fc6034dfb00f3a84013f7ff43f29ed4c"
 
 [[package]]
 name = "pin-project-lite"
@@ -378,6 +394,12 @@ version = "0.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8b870d8c151b6f2fb93e84a13146138f05d02ed11c7e7c54f8826aaaf7c9f184"
 
+[[package]]
+name = "portable-atomic"
+version = "1.6.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7170ef9988bc169ba16dd36a7fa041e5c4cbeb6a35b76d4c03daded371eae7c0"
+
 [[package]]
 name = "proc-macro-error"
 version = "1.0.4"
@@ -404,18 +426,18 @@ dependencies = [
 
 [[package]]
 name = "proc-macro2"
-version = "1.0.63"
+version = "1.0.78"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7b368fba921b0dce7e60f5e04ec15e565b3303972b42bcfde1d0713b881959eb"
+checksum = "e2422ad645d89c99f8f3e6b88a9fdeca7fabeac836b1002371c4367c8f984aae"
 dependencies = [
  "unicode-ident",
 ]
 
 [[package]]
 name = "quote"
-version = "1.0.29"
+version = "1.0.35"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "573015e8ab27661678357f27dc26460738fd2b6c86e46f386fde94cb5d913105"
+checksum = "291ec9ab5efd934aaf503a6466c5d5251535d108ee747472c3977cc5acc868ef"
 dependencies = [
  "proc-macro2",
 ]
@@ -431,7 +453,7 @@ dependencies = [
 
 [[package]]
 name = "rtic"
-version = "2.0.0"
+version = "2.0.1"
 dependencies = [
  "atomic-polyfill",
  "bare-metal 1.0.0",
@@ -443,9 +465,10 @@ dependencies = [
 
 [[package]]
 name = "rtic-common"
-version = "1.0.0"
+version = "1.0.1"
 dependencies = [
  "critical-section",
+ "portable-atomic",
 ]
 
 [[package]]
@@ -456,49 +479,44 @@ checksum = "d9369355b04d06a3780ec0f51ea2d225624db777acbc60abd8ca4832da5c1a42"
 
 [[package]]
 name = "rtic-macros"
-version = "2.0.0"
+version = "2.0.1"
 dependencies = [
  "indexmap",
  "proc-macro-error",
  "proc-macro2",
  "quote",
- "syn 1.0.109",
+ "syn 2.0.50",
 ]
 
 [[package]]
 name = "rtic-monotonics"
-version = "1.0.0"
+version = "2.0.0"
 dependencies = [
  "atomic-polyfill",
  "cfg-if",
  "cortex-m",
+ "embedded-hal 1.0.0",
  "fugit",
  "rtic-time",
 ]
 
 [[package]]
 name = "rtic-time"
-version = "1.0.0"
+version = "2.0.0"
 dependencies = [
  "critical-section",
+ "embedded-hal 1.0.0",
+ "embedded-hal-async",
+ "fugit",
  "futures-util",
  "rtic-common",
 ]
 
 [[package]]
 name = "rtt-target"
-version = "0.3.1"
+version = "0.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "065d6058bb1204f51a562a67209e1817cf714759d5cf845aa45c75fa7b0b9d9b"
-dependencies = [
- "ufmt-write",
-]
-
-[[package]]
-name = "rtt-target"
-version = "0.4.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3afa12c77ba1b9bf560e4039a9b9a08bb9cde0e9e6923955eeb917dd8d5cf303"
+checksum = "10b34c9e6832388e45f3c01f1bb60a016384a0a4ad80cdd7d34913bed25037f0"
 dependencies = [
  "critical-section",
  "ufmt-write",
@@ -553,9 +571,9 @@ dependencies = [
 
 [[package]]
 name = "stm32f3"
-version = "0.14.0"
+version = "0.15.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "265cda62ac13307414de4aca58dbbbd8038ddba85cffbb335823aa216f2e3200"
+checksum = "b28b37228ef3fa47956af38c6abd756e912f244c1657f14e66d42fc8d74ea96f"
 dependencies = [
  "bare-metal 1.0.0",
  "cortex-m",
@@ -567,30 +585,32 @@ dependencies = [
 name = "stm32f3-blinky"
 version = "0.1.0"
 dependencies = [
- "embedded-hal",
+ "cortex-m",
+ "embedded-hal 0.2.7",
  "panic-rtt-target",
  "rtic",
  "rtic-monotonics",
- "rtt-target 0.4.0",
+ "rtt-target",
  "stm32f3xx-hal",
 ]
 
 [[package]]
 name = "stm32f3xx-hal"
-version = "0.9.2"
+version = "0.10.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4c9d827f02df3826371c897404dfbea8a1abd544eed9d6cdc3e5f6e9f04b9e06"
+checksum = "4c73e8b6e63435b75198d2fe2b27cd7f5c8e0b07bd5da9f82cffddf23210f77f"
 dependencies = [
- "bare-metal 1.0.0",
  "bxcan",
  "cfg-if",
  "cortex-m",
  "cortex-m-rt",
+ "critical-section",
  "embedded-dma",
- "embedded-hal",
+ "embedded-hal 0.2.7",
  "embedded-time",
  "enumset",
  "nb 1.1.0",
+ "num-traits",
  "paste",
  "rtcc",
  "slice-group-by",
@@ -612,9 +632,9 @@ dependencies = [
 
 [[package]]
 name = "syn"
-version = "2.0.22"
+version = "2.0.50"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2efbeae7acf4eabd6bcdcbd11c92f45231ddda7539edc7806bd1a04a03b24616"
+checksum = "74f1bdc9872430ce9b75da68329d1c1746faf50ffac5f19e02b71e37ff881ffb"
 dependencies = [
  "proc-macro2",
  "quote",

examples/stm32f3_blinky/Cargo.toml

@@ -14,17 +14,21 @@ features = ["thumbv7-backend"]
 
 [dependencies.rtic-monotonics]
 path = "../../rtic-monotonics"
-version = "1.0.0"
+version = "2.0.0"
 features = ["cortex-m-systick"]
 
+[dependencies.cortex-m]
+version = "0.7.7"
+features = ["critical-section-single-core"]
+
 [dependencies]
 embedded-hal = "0.2.7"
-panic-rtt-target = { version = "0.1.2", features = ["cortex-m"] }
-rtt-target = { version = "0.4.0" }
+panic-rtt-target = { version = "0.1.3" }
+rtt-target = { version = "0.5.0" }
 
 [dependencies.stm32f3xx-hal]
 features = ["stm32f303xc", "rt"]
-version = "0.9.2"
+version = "0.10.0"
 
 # this lets you use `cargo fix`!
 [[bin]]

examples/stm32f3_blinky/src/main.rs

@@ -5,11 +5,13 @@
 
 use panic_rtt_target as _;
 use rtic::app;
-use rtic_monotonics::systick::*;
+use rtic_monotonics::systick::prelude::*;
 use rtt_target::{rprintln, rtt_init_print};
 use stm32f3xx_hal::gpio::{Output, PushPull, PA5};
 use stm32f3xx_hal::prelude::*;
 
+systick_monotonic!(Mono, 1000);
+
 #[app(device = stm32f3xx_hal::pac, peripherals = true, dispatchers = [SPI1])]
 mod app {
     use super::*;
@@ -30,8 +32,7 @@ mod app {
         let mut rcc = cx.device.RCC.constrain();
 
         // Initialize the systick interrupt & obtain the token to prove that we did
-        let systick_mono_token = rtic_monotonics::create_systick_token!();
-        Systick::start(cx.core.SYST, 36_000_000, systick_mono_token); // default STM32F303 clock-rate is 36MHz
+        Mono::start(cx.core.SYST, 36_000_000); // default STM32F303 clock-rate is 36MHz
 
         rtt_init_print!();
         rprintln!("init");
@@ -67,7 +68,7 @@ mod app {
                 cx.local.led.set_low().unwrap();
                 *cx.local.state = true;
             }
-            Systick::delay(1000.millis()).await;
+            Mono::delay(1000.millis()).await;
         }
     }
 }

examples/stm32g030f6_periodic_prints/.cargo/config.toml

@@ -0,0 +1,24 @@
+[target.'cfg(all(target_arch = "arm", target_os = "none"))']
+# TODO(2) replace `$CHIP` with your chip's name (see `probe-run --list-chips` output)
+runner = "probe-run --chip STM32G030F6Px"
+rustflags = [
+  "-C", "linker=flip-link",
+  "-C", "link-arg=-Tlink.x",
+  "-C", "link-arg=-Tdefmt.x",
+  # This is needed if your flash or ram addresses are not aligned to 0x10000 in memory.x
+  # See https://github.com/rust-embedded/cortex-m-quickstart/pull/95
+  "-C", "link-arg=--nmagic",
+]
+
+[build]
+# TODO(3) Adjust the compilation target.
+# (`thumbv6m-*` is compatible with all ARM Cortex-M chips but using the right
+# target improves performance)
+target = "thumbv6m-none-eabi"    # Cortex-M0 and Cortex-M0+
+# target = "thumbv7m-none-eabi"    # Cortex-M3
+# target = "thumbv7em-none-eabi"   # Cortex-M4 and Cortex-M7 (no FPU)
+# target = "thumbv7em-none-eabihf" # Cortex-M4F and Cortex-M7F (with FPU)
+
+[alias]
+rb = "run --bin"
+rrb = "run --release --bin"

examples/stm32g030f6_periodic_prints/.vscode/settings.json

@@ -0,0 +1,9 @@
+{
+    // override the default setting (`cargo check --all-targets`) which produces the following error
+    // "can't find crate for `test`" when the default compilation target is a no_std target
+    // with these changes RA will call `cargo check --bins` on save
+    "rust-analyzer.checkOnSave.allTargets": false,
+    "rust-analyzer.checkOnSave.extraArgs": [
+        "--bins"
+    ]
+}

examples/stm32g030f6_periodic_prints/Cargo.lock

@@ -0,0 +1,511 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
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+version = "1.0.3"
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+ "critical-section",
+]
+
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+name = "bare-metal"
+version = "0.2.5"
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+ "rustc_version",
+]
+
+[[package]]
+name = "bare-metal"
+version = "1.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
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+ "bare-metal 0.2.5",
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+checksum = "da25490ff9892aab3fcf7c36f08cfb902dd3e71ca0f9f9517bea02a73a5ce38c"
+dependencies = [
+ "proc-macro-error-attr",
+ "proc-macro2",
+ "quote",
+ "syn 1.0.109",
+ "version_check",
+]
+
+[[package]]
+name = "proc-macro-error-attr"
+version = "1.0.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a1be40180e52ecc98ad80b184934baf3d0d29f979574e439af5a55274b35f869"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "version_check",
+]
+
+[[package]]
+name = "proc-macro2"
+version = "1.0.78"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e2422ad645d89c99f8f3e6b88a9fdeca7fabeac836b1002371c4367c8f984aae"
+dependencies = [
+ "unicode-ident",
+]
+
+[[package]]
+name = "quote"
+version = "1.0.35"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "291ec9ab5efd934aaf503a6466c5d5251535d108ee747472c3977cc5acc868ef"
+dependencies = [
+ "proc-macro2",
+]
+
+[[package]]
+name = "rtic"
+version = "2.0.1"
+dependencies = [
+ "atomic-polyfill",
+ "bare-metal 1.0.0",
+ "cortex-m",
+ "critical-section",
+ "rtic-core",
+ "rtic-macros",
+]
+
+[[package]]
+name = "rtic-common"
+version = "1.0.1"
+dependencies = [
+ "critical-section",
+ "portable-atomic",
+]
+
+[[package]]
+name = "rtic-core"
+version = "1.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d9369355b04d06a3780ec0f51ea2d225624db777acbc60abd8ca4832da5c1a42"
+
+[[package]]
+name = "rtic-macros"
+version = "2.0.1"
+dependencies = [
+ "indexmap",
+ "proc-macro-error",
+ "proc-macro2",
+ "quote",
+ "syn 2.0.51",
+]
+
+[[package]]
+name = "rtic-monotonics"
+version = "2.0.0"
+dependencies = [
+ "atomic-polyfill",
+ "cfg-if",
+ "cortex-m",
+ "embedded-hal 1.0.0",
+ "fugit",
+ "proc-macro2",
+ "quote",
+ "rtic-time",
+ "stm32-metapac",
+]
+
+[[package]]
+name = "rtic-time"
+version = "2.0.0"
+dependencies = [
+ "critical-section",
+ "embedded-hal 1.0.0",
+ "embedded-hal-async",
+ "fugit",
+ "futures-util",
+ "rtic-common",
+]
+
+[[package]]
+name = "rustc_version"
+version = "0.2.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "138e3e0acb6c9fb258b19b67cb8abd63c00679d2851805ea151465464fe9030a"
+dependencies = [
+ "semver",
+]
+
+[[package]]
+name = "semver"
+version = "0.9.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1d7eb9ef2c18661902cc47e535f9bc51b78acd254da71d375c2f6720d9a40403"
+dependencies = [
+ "semver-parser",
+]
+
+[[package]]
+name = "semver-parser"
+version = "0.7.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "388a1df253eca08550bef6c72392cfe7c30914bf41df5269b68cbd6ff8f570a3"
+
+[[package]]
+name = "stm32-metapac"
+version = "15.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "deabea56a8821dcea05d0109f3ab3135f31eb572444e5da203d06149c594c8c6"
+dependencies = [
+ "cortex-m",
+]
+
+[[package]]
+name = "stm32g0"
+version = "0.14.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "dfc2ac544cea741c92a501bfd027d197354cd22ee92b439aea26d2ee0b55bcd7"
+dependencies = [
+ "bare-metal 1.0.0",
+ "cortex-m",
+ "cortex-m-rt",
+ "vcell",
+]
+
+[[package]]
+name = "stm32g030f6_periodic_prints"
+version = "0.1.0"
+dependencies = [
+ "cortex-m",
+ "cortex-m-rt",
+ "defmt",
+ "defmt-rtt",
+ "fugit",
+ "panic-probe",
+ "rtic",
+ "rtic-monotonics",
+ "stm32g0xx-hal",
+]
+
+[[package]]
+name = "stm32g0xx-hal"
+version = "0.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "fae457e81f9601121c5b92dca20e3612c80ea957898f8e0e68efcaab6b242067"
+dependencies = [
+ "bare-metal 1.0.0",
+ "cortex-m",
+ "embedded-hal 0.2.7",
+ "fugit",
+ "nb 1.1.0",
+ "stm32g0",
+ "void",
+]
+
+[[package]]
+name = "syn"
+version = "1.0.109"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "72b64191b275b66ffe2469e8af2c1cfe3bafa67b529ead792a6d0160888b4237"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "unicode-ident",
+]
+
+[[package]]
+name = "syn"
+version = "2.0.51"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6ab617d94515e94ae53b8406c628598680aa0c9587474ecbe58188f7b345d66c"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "unicode-ident",
+]
+
+[[package]]
+name = "thiserror"
+version = "1.0.57"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1e45bcbe8ed29775f228095caf2cd67af7a4ccf756ebff23a306bf3e8b47b24b"
+dependencies = [
+ "thiserror-impl",
+]
+
+[[package]]
+name = "thiserror-impl"
+version = "1.0.57"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a953cb265bef375dae3de6663da4d3804eee9682ea80d8e2542529b73c531c81"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 2.0.51",
+]
+
+[[package]]
+name = "unicode-ident"
+version = "1.0.12"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3354b9ac3fae1ff6755cb6db53683adb661634f67557942dea4facebec0fee4b"
+
+[[package]]
+name = "vcell"
+version = "0.1.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "77439c1b53d2303b20d9459b1ade71a83c716e3f9c34f3228c00e6f185d6c002"
+
+[[package]]
+name = "version_check"
+version = "0.9.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "49874b5167b65d7193b8aba1567f5c7d93d001cafc34600cee003eda787e483f"
+
+[[package]]
+name = "void"
+version = "1.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6a02e4885ed3bc0f2de90ea6dd45ebcbb66dacffe03547fadbb0eeae2770887d"
+
+[[package]]
+name = "volatile-register"
+version = "0.2.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "de437e2a6208b014ab52972a27e59b33fa2920d3e00fe05026167a1c509d19cc"
+dependencies = [
+ "vcell",
+]

examples/stm32g030f6_periodic_prints/Cargo.toml

@@ -0,0 +1,48 @@
+[package]
+authors = ["Finomnis <finomnis@gmail.com>"]
+name = "stm32g030f6_periodic_prints"
+edition = "2021"
+version = "0.1.0"
+
+[workspace]
+
+
+[dependencies.rtic]
+path = "../../rtic"
+version = "2.0.1"
+features = ["thumbv6-backend"]
+
+[dependencies.rtic-monotonics]
+path = "../../rtic-monotonics"
+version = "2.0.0"
+features = ["stm32g030f6", "stm32_tim3"]
+
+
+[dependencies]
+cortex-m = { version = "0.7.7", features = ["critical-section-single-core"] }
+cortex-m-rt = "0.7.3"
+defmt = "0.3.4"
+defmt-rtt = "0.4.0"
+fugit = "0.3.7"
+panic-probe = { version = "0.3.1", features = ["print-defmt"] }
+
+stm32g0xx-hal = { version = "0.2.0", features = ["rt", "stm32g030"] }
+
+# cargo build/run
+[profile.dev]
+codegen-units = 1
+debug = 2
+debug-assertions = true # <-
+incremental = false
+opt-level = 3           # <-
+overflow-checks = true  # <-
+
+# cargo build/run --release
+[profile.release]
+codegen-units = 1
+debug = 2
+debug-assertions = false # <-
+incremental = false
+lto = 'fat'
+opt-level = 3            # <-
+overflow-checks = false  # <-

examples/stm32g030f6_periodic_prints/README.md

@@ -0,0 +1,31 @@
+# `stm32g030f6_periodic_prints`
+
+An RTIC periodic print example intended for the stm32g030f6 chip.
+
+## Dependencies
+
+#### 1. `flip-link`:
+
+```console
+$ cargo install flip-link
+```
+
+#### 2. `probe-rs`:
+
+``` console
+$ # make sure to install v0.2.0 or later
+$ cargo install probe-rs --features cli
+```
+
+
+## Run
+
+The stm32g030f6 chip needs to be connected to the computer via an SWD probe, like a [J-Link EDU Mini].
+
+Then, run:
+
+```
+cargo run --release
+```
+
+[J-Link EDU Mini]: https://www.segger.com/products/debug-probes/j-link/models/j-link-edu-mini/

examples/stm32g030f6_periodic_prints/memory.x

@@ -0,0 +1,6 @@
+/* Linker script for the STM32G030F6 */
+MEMORY
+{
+  FLASH : ORIGIN = 0x08000000, LENGTH = 32K
+  RAM : ORIGIN = 0x20000000, LENGTH = 8K
+}

examples/stm32g030f6_periodic_prints/src/main.rs

@@ -0,0 +1,57 @@
+#![deny(unsafe_code)]
+#![deny(warnings)]
+#![no_main]
+#![no_std]
+
+use defmt_rtt as _; // global logger
+
+pub use stm32g0xx_hal as hal; // memory layout
+
+use panic_probe as _;
+
+// same panicking *behavior* as `panic-probe` but doesn't print a panic message
+// this prevents the panic message being printed *twice* when `defmt::panic` is invoked
+#[defmt::panic_handler]
+fn panic() -> ! {
+    cortex_m::asm::udf()
+}
+
+use rtic_monotonics::stm32::prelude::*;
+stm32_tim3_monotonic!(Mono, 1_000_000);
+
+#[rtic::app(device = hal::stm32, peripherals = true, dispatchers = [USART1, USART2])]
+mod app {
+    use super::*;
+
+    #[local]
+    struct LocalResources {}
+
+    #[shared]
+    struct SharedResources {}
+
+    #[init]
+    fn init(ctx: init::Context) -> (SharedResources, LocalResources) {
+        // enable dma clock during sleep, otherwise defmt doesn't work
+        ctx.device.RCC.ahbenr.modify(|_, w| w.dmaen().set_bit());
+
+        defmt::println!("TIM Monotonic blinker example!");
+
+        // Start the monotonic
+        Mono::start(16_000_000);
+
+        print_messages::spawn().unwrap();
+
+        (SharedResources {}, LocalResources {})
+    }
+
+    #[task(priority = 2)]
+    async fn print_messages(_cx: print_messages::Context) {
+        let mut next_update = <Mono as Monotonic>::Instant::from_ticks(0u64);
+
+        loop {
+            defmt::println!("Time: {} ticks", Mono::now().ticks());
+            next_update += 1000u64.millis();
+            Mono::delay_until(next_update).await;
+        }
+    }
+}

examples/teensy4_blinky/Cargo.lock

@@ -133,9 +133,18 @@ dependencies = [
 
 [[package]]
 name = "embedded-hal"
-version = "1.0.0-rc.2"
+version = "1.0.0-rc.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3e57ec6ad0bc8eb967cf9c9f144177f5e8f2f6f02dad0b8b683f9f05f6b22def"
+checksum = "bc402f79e1fd22731ca945b4f97b5ff37e7b3f379312595c42bb2e8811c29920"
+
+[[package]]
+name = "embedded-hal-async"
+version = "1.0.0-rc.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "fa1fba2ef2ffb35d614acc6fb323ddf7facc45c069f24544d49ea54e5043626d"
+dependencies = [
+ "embedded-hal 1.0.0-rc.3",
+]
 
 [[package]]
 name = "equivalent"
@@ -440,12 +449,12 @@ dependencies = [
 
 [[package]]
 name = "rtic-monotonics"
-version = "1.4.0"
+version = "2.0.0"
 dependencies = [
  "atomic-polyfill",
  "cfg-if",
  "cortex-m",
- "embedded-hal 1.0.0-rc.2",
+ "embedded-hal 1.0.0-rc.3",
  "fugit",
  "imxrt-ral",
  "rtic-time",
@@ -453,9 +462,12 @@ dependencies = [
 
 [[package]]
 name = "rtic-time"
-version = "1.1.0"
+version = "2.0.0"
 dependencies = [
  "critical-section",
+ "embedded-hal 1.0.0-rc.3",
+ "embedded-hal-async",
+ "fugit",
  "futures-util",
  "rtic-common",
 ]

examples/teensy4_blinky/Cargo.toml

@@ -14,7 +14,7 @@ features = ["thumbv7-backend"]
 
 [dependencies.rtic-monotonics]
 path = "../../rtic-monotonics"
-version = "1.2.1"
+version = "2.0.0"
 features = ["imxrt_gpt1"]
 
 [dependencies]

examples/teensy4_blinky/examples/with_logs.rs

@@ -13,9 +13,8 @@ use bsp::logging;
 
 use embedded_hal::serial::Write;
 
-use rtic_monotonics::imxrt::Gpt1 as Mono;
-use rtic_monotonics::imxrt::*;
-use rtic_monotonics::Monotonic;
+use rtic_monotonics::imxrt::prelude::*;
+imxrt_gpt1_monotonic!(Mono, board::PERCLK_FREQUENCY);
 
 #[rtic::app(device = teensy4_bsp, dispatchers = [LPSPI1])]
 mod app {
@@ -61,8 +60,7 @@ mod app {
 
         // Initialize Monotonic
         gpt1.set_clock_source(hal::gpt::ClockSource::PeripheralClock);
-        let gpt1_mono_token = rtic_monotonics::create_imxrt_gpt1_token!();
-        Mono::start(board::PERCLK_FREQUENCY, gpt1.release(), gpt1_mono_token);
+        Mono::start(gpt1.release());
 
         // Setup LED
         let led = board::led(&mut gpio2, pins.p13);

examples/teensy4_blinky/src/main.rs

@@ -10,8 +10,8 @@ fn panic(_: &::core::panic::PanicInfo) -> ! {
 
 use teensy4_bsp::{board, hal};
 
-use rtic_monotonics::imxrt::Gpt1 as Mono;
-use rtic_monotonics::imxrt::*;
+use rtic_monotonics::imxrt::prelude::*;
+imxrt_gpt1_monotonic!(Mono, board::PERCLK_FREQUENCY);
 
 #[rtic::app(device = teensy4_bsp, dispatchers = [LPSPI1])]
 mod app {
@@ -36,8 +36,7 @@ mod app {
 
         // Initialize Monotonic
         gpt1.set_clock_source(hal::gpt::ClockSource::PeripheralClock);
-        let gpt1_mono_token = rtic_monotonics::create_imxrt_gpt1_token!();
-        Mono::start(board::PERCLK_FREQUENCY, gpt1.release(), gpt1_mono_token);
+        Mono::start(gpt1.release());
 
         // Setup LED
         let led = board::led(&mut gpio2, pins.p13);

rtic-macros/src/codegen/bindings/esp32c3.rs

@@ -242,8 +242,7 @@ mod esp32c3 {
         stmts
     }
 
-pub fn extra_modules(_app: &App, _analysis: &SyntaxAnalysis) -> Vec<TokenStream2> {
-    vec![]
+    pub fn extra_modules(_app: &App, _analysis: &SyntaxAnalysis) -> Vec<TokenStream2> {
+        vec![]
+    }
 }
-}
-

rtic-monotonics/CHANGELOG.md

@@ -5,10 +5,12 @@ This project adheres to [Semantic Versioning](http://semver.org/).
 
 For each category, *Added*, *Changed*, *Fixed* add new entries at the top!
 
-## Unreleased
+## Unreleased - v2.0.0
 
 ### Changed
 
+- Rework all timers based on `rtic-time 2.0.0`
+- Most timer tick rates are now configurable
 - Tweak `build.rs` to avoid warnings in Nightly 1.78+
 - Removed unused `rust-toolchain.toml`
 

rtic-monotonics/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "rtic-monotonics"
-version = "1.5.0"
+version = "2.0.0"
 
 edition = "2021"
 authors = [
@@ -24,13 +24,17 @@ features = [
     "imxrt_gpt1",
     "imxrt_gpt2",
     "imxrt-ral/imxrt1011",
+    "stm32h725ag",
+    "stm32_tim2",
+    "stm32_tim3",
+    "stm32_tim4",
+    "stm32_tim5",
+    "stm32_tim15",
 ]
 rustdoc-flags = ["--cfg", "docsrs"]
 
 [dependencies]
-rtic-time = { version = "1.1.0", path = "../rtic-time" }
-embedded-hal = { version = "1.0" }
-embedded-hal-async = { version = "1.0", optional = true }
+rtic-time = { version = "2.0.0", path = "../rtic-time" }
 fugit = { version = "0.3.6" }
 atomic-polyfill = "1"
 cfg-if = "1.0.0"
@@ -69,8 +73,6 @@ defmt = ["fugit/defmt"]
 
 # Systick on Cortex-M, default 1 kHz
 cortex-m-systick = ["dep:cortex-m"]
-systick-100hz = []
-systick-10khz = []
 # Use 64-bit wide backing storage for the Instant
 systick-64bit = []
 
@@ -99,7 +101,6 @@ stm32_tim2 = []
 stm32_tim3 = []
 stm32_tim4 = []
 stm32_tim5 = []
-stm32_tim12 = []
 stm32_tim15 = []
 
 stm32-metapac = ["dep:stm32-metapac", "dep:quote", "dep:proc-macro2"]

rtic-monotonics/src/imxrt.rs

@@ -1,112 +1,158 @@
-//! [`Monotonic`] implementations for i.MX RT's GPT peripherals.
+//! [`Monotonic`](rtic_time::Monotonic) implementations for i.MX RT's GPT peripherals.
 //!
 //! # Example
 //!
 //! ```
-//! use rtic_monotonics::imxrt::*;
-//! use rtic_monotonics::imxrt::Gpt1 as Mono;
+//! use rtic_monotonics::imxrt::prelude::*;
+//! imxrt_gpt1_monotonic!(Mono, 1_000_000);
 //!
 //! fn init() {
-//!     // Obtain ownership of the timer register block
+//!     // Obtain ownership of the timer register block.
 //!     let gpt1 = unsafe { imxrt_ral::gpt::GPT1::instance() };
 //!
-//!     // Configure the timer clock source and determine its tick rate
-//!     let timer_tickrate_hz = 1_000_000;
-//!
-//!     // Generate timer token to ensure correct timer interrupt handler is used
-//!     let token = rtic_monotonics::create_imxrt_gpt1_token!();
+//!     // Configure the timer tick rate as specified earlier
+//!     todo!("Configure the gpt1 peripheral to a tick rate of 1_000_000");
 //!
 //!     // Start the monotonic
-//!     Mono::start(timer_tickrate_hz, gpt1, token);
+//!     Mono::start(gpt1);
 //! }
 //!
 //! async fn usage() {
 //!     loop {
 //!          // Use the monotonic
-//!          let timestamp = Mono::now().ticks();
+//!          let timestamp = Mono::now();
 //!          Mono::delay(100.millis()).await;
 //!     }
 //! }
 //! ```
 
-use crate::{Monotonic, TimeoutError, TimerQueue};
 use atomic_polyfill::{AtomicU32, Ordering};
-pub use fugit::{self, ExtU64, ExtU64Ceil};
-use rtic_time::half_period_counter::calculate_now;
+use rtic_time::{
+    half_period_counter::calculate_now,
+    timer_queue::{TimerQueue, TimerQueueBackend},
+};
 
-use imxrt_ral as ral;
+pub use imxrt_ral as ral;
 
-const TIMER_HZ: u32 = 1_000_000;
+/// Common definitions and traits for using the i.MX RT monotonics
+pub mod prelude {
+    #[cfg(feature = "imxrt_gpt1")]
+    pub use crate::imxrt_gpt1_monotonic;
+    #[cfg(feature = "imxrt_gpt2")]
+    pub use crate::imxrt_gpt2_monotonic;
+
+    pub use crate::Monotonic;
+    pub use fugit::{self, ExtU64, ExtU64Ceil};
+}
 
 #[doc(hidden)]
 #[macro_export]
 macro_rules! __internal_create_imxrt_timer_interrupt {
-    ($mono_timer:ident, $timer:ident, $timer_token:ident) => {{
+    ($mono_backend:ident, $timer:ident) => {
         #[no_mangle]
         #[allow(non_snake_case)]
         unsafe extern "C" fn $timer() {
-            $crate::imxrt::$mono_timer::__tq().on_monotonic_interrupt();
+            use $crate::TimerQueueBackend;
+            $crate::imxrt::$mono_backend::timer_queue().on_monotonic_interrupt();
+        }
+    };
+}
+
+#[doc(hidden)]
+#[macro_export]
+macro_rules! __internal_create_imxrt_timer_struct {
+    ($name:ident, $mono_backend:ident, $timer:ident, $tick_rate_hz:expr) => {
+        /// A `Monotonic` based on the GPT peripheral.
+        struct $name;
+
+        impl $name {
+            /// Starts the `Monotonic`.
+            ///
+            /// This method must be called only once.
+            pub fn start(gpt: $crate::imxrt::ral::gpt::$timer) {
+                $crate::__internal_create_imxrt_timer_interrupt!($mono_backend, $timer);
+
+                $crate::imxrt::$mono_backend::_start(gpt);
+            }
         }
 
-        pub struct $timer_token;
+        impl $crate::TimerQueueBasedMonotonic for $name {
+            type Backend = $crate::imxrt::$mono_backend;
+            type Instant = $crate::fugit::Instant<
+                <Self::Backend as $crate::TimerQueueBackend>::Ticks,
+                1,
+                { $tick_rate_hz },
+            >;
+            type Duration = $crate::fugit::Duration<
+                <Self::Backend as $crate::TimerQueueBackend>::Ticks,
+                1,
+                { $tick_rate_hz },
+            >;
+        }
 
-        unsafe impl $crate::InterruptToken<$crate::imxrt::$mono_timer> for $timer_token {}
-
-        $timer_token
-    }};
+        $crate::rtic_time::impl_embedded_hal_delay_fugit!($name);
+        $crate::rtic_time::impl_embedded_hal_async_delay_fugit!($name);
+    };
 }
 
-/// Register the GPT1 interrupt for the monotonic.
+/// Create a GPT1 based monotonic and register the GPT1 interrupt for it.
+///
+/// See [`crate::imxrt`] for more details.
+///
+/// # Arguments
+///
+/// * `name` - The name that the monotonic type will have.
+/// * `tick_rate_hz` - The tick rate of the timer peripheral. It's the user's responsibility
+///                    to configure the peripheral to the given frequency before starting the
+///                    monotonic.
 #[cfg(feature = "imxrt_gpt1")]
 #[macro_export]
-macro_rules! create_imxrt_gpt1_token {
-    () => {{
-        $crate::__internal_create_imxrt_timer_interrupt!(Gpt1, GPT1, Gpt1Token)
-    }};
+macro_rules! imxrt_gpt1_monotonic {
+    ($name:ident, $tick_rate_hz:expr) => {
+        $crate::__internal_create_imxrt_timer_struct!($name, Gpt1Backend, GPT1, $tick_rate_hz);
+    };
 }
 
-/// Register the GPT2 interrupt for the monotonic.
+/// Create a GPT2 based monotonic and register the GPT2 interrupt for it.
+///
+/// See [`crate::imxrt`] for more details.
+///
+/// # Arguments
+///
+/// * `name` - The name that the monotonic type will have.
+/// * `tick_rate_hz` - The tick rate of the timer peripheral. It's the user's responsibility
+///                    to configure the peripheral to the given frequency before starting the
+///                    monotonic.
 #[cfg(feature = "imxrt_gpt2")]
 #[macro_export]
-macro_rules! create_imxrt_gpt2_token {
-    () => {{
-        $crate::__internal_create_imxrt_timer_interrupt!(Gpt2, GPT2, Gpt2Token)
-    }};
+macro_rules! imxrt_gpt2_monotonic {
+    ($name:ident, $tick_rate_hz:expr) => {
+        $crate::__internal_create_imxrt_timer_struct!($name, Gpt2Backend, GPT2, $tick_rate_hz);
+    };
 }
 
 macro_rules! make_timer {
-    ($mono_name:ident, $timer:ident, $period:ident, $tq:ident$(, doc: ($($doc:tt)*))?) => {
-        /// Timer implementing [`Monotonic`] which runs at 1 MHz.
+    ($mono_name:ident, $backend_name:ident, $timer:ident, $period:ident, $tq:ident$(, doc: ($($doc:tt)*))?) => {
+        /// GPT based [`TimerQueueBackend`].
         $(
             #[cfg_attr(docsrs, doc(cfg($($doc)*)))]
         )?
 
-        pub struct $mono_name;
+        pub struct $backend_name;
 
         use ral::gpt::$timer;
 
         /// Number of 2^31 periods elapsed since boot.
         static $period: AtomicU32 = AtomicU32::new(0);
-        static $tq: TimerQueue<$mono_name> = TimerQueue::new();
+        static $tq: TimerQueue<$backend_name> = TimerQueue::new();
 
-        impl $mono_name {
-            /// Starts the monotonic timer.
+        impl $backend_name {
+            /// Starts the timer.
             ///
-            /// - `tick_freq_hz`: The tick frequency of the given timer.
-            /// - `gpt`: The GPT timer register block instance.
-            /// - `_interrupt_token`: Required for correct timer interrupt handling.
+            /// **Do not use this function directly.**
             ///
-            /// This method must be called only once.
-            pub fn start(tick_freq_hz: u32, gpt: $timer, _interrupt_token: impl crate::InterruptToken<Self>) {
-                // Find a prescaler that creates our desired tick frequency
-                let previous_prescaler = ral::read_reg!(ral::gpt, gpt, PR, PRESCALER) + 1;
-                let previous_clock_freq = tick_freq_hz * previous_prescaler;
-                assert!((previous_clock_freq % TIMER_HZ) == 0,
-                        "Unable to find a fitting prescaler value!\n    Input: {}/{}\n    Desired: {}",
-                        previous_clock_freq, previous_prescaler, TIMER_HZ);
-                let prescaler = previous_clock_freq / TIMER_HZ;
-                assert!(prescaler > 0);
-                assert!(prescaler <= 4096);
+            /// Use the prelude macros instead.
+            pub fn _start(gpt: $timer) {
 
                 // Disable the timer.
                 ral::modify_reg!(ral::gpt, gpt, CR, EN: 0);
@@ -122,11 +168,6 @@ macro_rules! make_timer {
                 // Reset period
                 $period.store(0, Ordering::SeqCst);
 
-                // Prescaler
-                ral::modify_reg!(ral::gpt, gpt, PR,
-                    PRESCALER: (prescaler - 1), // Scale to our desired clock rate
-                );
-
                 // Enable interrupts
                 ral::write_reg!(ral::gpt, gpt, IR,
                     ROVIE: 1,   // Rollover interrupt
@@ -150,7 +191,6 @@ macro_rules! make_timer {
                     ENMOD: 0,   // Keep state when disabled
                 );
 
-
                 // SAFETY: We take full ownership of the peripheral and interrupt vector,
                 // plus we are not using any external shared resources so we won't impact
                 // basepri/source masking based critical sections.
@@ -159,65 +199,21 @@ macro_rules! make_timer {
                     cortex_m::peripheral::NVIC::unmask(ral::Interrupt::$timer);
                 }
             }
-
-            /// Used to access the underlying timer queue
-            #[doc(hidden)]
-            pub fn __tq() -> &'static TimerQueue<$mono_name> {
-                &$tq
-            }
-
-            /// Delay for some duration of time.
-            #[inline]
-            pub async fn delay(duration: <Self as Monotonic>::Duration) {
-                $tq.delay(duration).await;
-            }
-
-            /// Timeout at a specific time.
-            pub async fn timeout_at<F: core::future::Future>(
-                instant: <Self as rtic_time::Monotonic>::Instant,
-                future: F,
-            ) -> Result<F::Output, TimeoutError> {
-                $tq.timeout_at(instant, future).await
-            }
-
-            /// Timeout after a specific duration.
-            #[inline]
-            pub async fn timeout_after<F: core::future::Future>(
-                duration: <Self as Monotonic>::Duration,
-                future: F,
-            ) -> Result<F::Output, TimeoutError> {
-                $tq.timeout_after(duration, future).await
-            }
-
-            /// Delay to some specific time instant.
-            #[inline]
-            pub async fn delay_until(instant: <Self as Monotonic>::Instant) {
-                $tq.delay_until(instant).await;
-            }
         }
 
-        rtic_time::embedded_hal_delay_impl_fugit64!($mono_name);
+        impl TimerQueueBackend for $backend_name {
+            type Ticks = u64;
 
-        #[cfg(feature = "embedded-hal-async")]
-        rtic_time::embedded_hal_async_delay_impl_fugit64!($mono_name);
-
-        impl Monotonic for $mono_name {
-            type Instant = fugit::TimerInstantU64<TIMER_HZ>;
-            type Duration = fugit::TimerDurationU64<TIMER_HZ>;
-
-            const ZERO: Self::Instant = Self::Instant::from_ticks(0);
-            const TICK_PERIOD: Self::Duration = Self::Duration::from_ticks(1);
-
-            fn now() -> Self::Instant {
+            fn now() -> Self::Ticks {
                 let gpt = unsafe{ $timer::instance() };
 
-                Self::Instant::from_ticks(calculate_now(
+                calculate_now(
                     || $period.load(Ordering::Relaxed),
                     || ral::read_reg!(ral::gpt, gpt, CNT)
-                ))
+                )
             }
 
-            fn set_compare(instant: Self::Instant) {
+            fn set_compare(instant: Self::Ticks) {
                 let gpt = unsafe{ $timer::instance() };
 
                 // Set the timer regardless of whether it is multiple periods in the future,
@@ -225,8 +221,7 @@ macro_rules! make_timer {
                 // The worst thing that can happen is a spurious wakeup, and with a timer
                 // period of half an hour, this is hardly a problem.
 
-                let ticks = instant.duration_since_epoch().ticks();
-                let ticks_wrapped = ticks as u32;
+                let ticks_wrapped = instant as u32;
 
                 ral::write_reg!(ral::gpt, gpt, OCR[1], ticks_wrapped);
             }
@@ -257,12 +252,16 @@ macro_rules! make_timer {
                     assert!(prev % 2 == 0, "Monotonic must have skipped an interrupt!");
                 }
             }
+
+            fn timer_queue() -> &'static TimerQueue<Self> {
+                &$tq
+            }
         }
     };
 }
 
 #[cfg(feature = "imxrt_gpt1")]
-make_timer!(Gpt1, GPT1, GPT1_HALFPERIODS, GPT1_TQ);
+make_timer!(Gpt1, Gpt1Backend, GPT1, GPT1_HALFPERIODS, GPT1_TQ);
 
 #[cfg(feature = "imxrt_gpt2")]
-make_timer!(Gpt2, GPT2, GPT2_HALFPERIODS, GPT2_TQ);
+make_timer!(Gpt2, Gpt2Backend, GPT2, GPT2_HALFPERIODS, GPT2_TQ);

rtic-monotonics/src/lib.rs

@@ -21,14 +21,18 @@
 //! `Available on crate features X only` tag are available on any `nrf52*` feature.
 //!
 // To build these docs correctly:
-// RUSTFLAGS="--cfg docsrs" cargo doc --featuers cortex-m-systick,rp2040,nrf52840
+// RUSTFLAGS="--cfg docsrs" cargo +nightly doc --features thumbv7-backend,cortex-m-systick,rp2040,nrf52840,imxrt_gpt1,imxrt_gpt2,imxrt-ral/imxrt1011,stm32h725ag,stm32_tim2,stm32_tim3,stm32_tim4,stm32_tim5,stm32_tim15
 
 #![no_std]
 #![deny(missing_docs)]
 #![allow(incomplete_features)]
 #![cfg_attr(docsrs, feature(doc_cfg))]
 
-pub use rtic_time::{Monotonic, TimeoutError, TimerQueue};
+pub use fugit;
+pub use rtic_time::{
+    self, monotonic::TimerQueueBasedMonotonic, timer_queue::TimerQueueBackend, Monotonic,
+    TimeoutError,
+};
 
 #[cfg(feature = "cortex-m-systick")]
 pub mod systick;
@@ -92,13 +96,3 @@ pub(crate) unsafe fn set_monotonic_prio(
 
     nvic.set_priority(interrupt, hw_prio);
 }
-
-/// This marker is implemented on an interrupt token to enforce that the right tokens
-/// are given to the correct monotonic implementation.
-///
-/// This trait is implemented by this crate and not intended for user implementation.
-///
-/// # Safety
-///
-/// This is only safely implemented by this crate.
-pub unsafe trait InterruptToken<Periperhal> {}

rtic-monotonics/src/nrf/rtc.rs

@@ -1,96 +1,152 @@
-//! [`Monotonic`] implementation for the nRF Real Time Clocks (RTC).
+//! [`Monotonic`](rtic_time::Monotonic) implementation for the nRF Real Time Clocks (RTC).
 //!
 //! # Example
 //!
 //! ```
-//! use rtic_monotonics::nrf::rtc::*;
+//! use rtic_monotonics::nrf::rtc::prelude::*;
+//! nrf_rtc0_monotonic!(Mono);
 //!
 //! fn init() {
 //!     # // This is normally provided by the selected PAC
 //!     # let rtc = unsafe { core::mem::transmute(()) };
-//!     // Generate the required token
-//!     let token = rtic_monotonics::create_nrf_rtc0_monotonic_token!();
-//!
 //!     // Start the monotonic
-//!     Rtc0::start(rtc, token);
+//!     Mono::start(rtc);
 //! }
 //!
 //! async fn usage() {
 //!     loop {
 //!          // Use the monotonic
-//!          Rtc0::delay(100.millis()).await;
+//!          let timestamp = Mono::now();
+//!          Mono::delay(100.millis()).await;
 //!     }
 //! }
 //! ```
 
-#[cfg(feature = "nrf52810")]
-use nrf52810_pac::{self as pac, Interrupt, RTC0, RTC1};
-#[cfg(feature = "nrf52811")]
-use nrf52811_pac::{self as pac, Interrupt, RTC0, RTC1};
-#[cfg(feature = "nrf52832")]
-use nrf52832_pac::{self as pac, Interrupt, RTC0, RTC1, RTC2};
-#[cfg(feature = "nrf52833")]
-use nrf52833_pac::{self as pac, Interrupt, RTC0, RTC1, RTC2};
-#[cfg(feature = "nrf52840")]
-use nrf52840_pac::{self as pac, Interrupt, RTC0, RTC1, RTC2};
-#[cfg(feature = "nrf5340-app")]
-use nrf5340_app_pac::{self as pac, Interrupt, RTC0_NS as RTC0, RTC1_NS as RTC1};
-#[cfg(feature = "nrf5340-net")]
-use nrf5340_net_pac::{self as pac, Interrupt, RTC0_NS as RTC0, RTC1_NS as RTC1};
-#[cfg(feature = "nrf9160")]
-use nrf9160_pac::{self as pac, Interrupt, RTC0_NS as RTC0, RTC1_NS as RTC1};
+/// Common definitions and traits for using the nRF RTC monotonics
+pub mod prelude {
+    pub use crate::nrf_rtc0_monotonic;
+    pub use crate::nrf_rtc1_monotonic;
+    #[cfg(any(feature = "nrf52832", feature = "nrf52833", feature = "nrf52840"))]
+    pub use crate::nrf_rtc2_monotonic;
+
+    pub use crate::Monotonic;
+    pub use fugit::{self, ExtU64, ExtU64Ceil};
+}
+
+#[cfg(feature = "nrf52810")]
+#[doc(hidden)]
+pub use nrf52810_pac::{self as pac, RTC0, RTC1};
+#[cfg(feature = "nrf52811")]
+#[doc(hidden)]
+pub use nrf52811_pac::{self as pac, RTC0, RTC1};
+#[cfg(feature = "nrf52832")]
+#[doc(hidden)]
+pub use nrf52832_pac::{self as pac, RTC0, RTC1, RTC2};
+#[cfg(feature = "nrf52833")]
+#[doc(hidden)]
+pub use nrf52833_pac::{self as pac, RTC0, RTC1, RTC2};
+#[cfg(feature = "nrf52840")]
+#[doc(hidden)]
+pub use nrf52840_pac::{self as pac, RTC0, RTC1, RTC2};
+#[cfg(feature = "nrf5340-app")]
+#[doc(hidden)]
+pub use nrf5340_app_pac::{self as pac, RTC0_NS as RTC0, RTC1_NS as RTC1};
+#[cfg(feature = "nrf5340-net")]
+#[doc(hidden)]
+pub use nrf5340_net_pac::{self as pac, RTC0_NS as RTC0, RTC1_NS as RTC1};
+#[cfg(feature = "nrf9160")]
+#[doc(hidden)]
+pub use nrf9160_pac::{self as pac, RTC0_NS as RTC0, RTC1_NS as RTC1};
 
-use crate::{Monotonic, TimeoutError, TimerQueue};
 use atomic_polyfill::{AtomicU32, Ordering};
-use core::future::Future;
-pub use fugit::{self, ExtU64, ExtU64Ceil};
-use rtic_time::half_period_counter::calculate_now;
+use rtic_time::{
+    half_period_counter::calculate_now,
+    timer_queue::{TimerQueue, TimerQueueBackend},
+};
 
 #[doc(hidden)]
 #[macro_export]
 macro_rules! __internal_create_nrf_rtc_interrupt {
-    ($mono_timer:ident, $rtc:ident, $rtc_token:ident) => {{
+    ($mono_backend:ident, $rtc:ident) => {
         #[no_mangle]
         #[allow(non_snake_case)]
         unsafe extern "C" fn $rtc() {
-            $crate::nrf::rtc::$mono_timer::__tq().on_monotonic_interrupt();
+            use $crate::TimerQueueBackend;
+            $crate::nrf::rtc::$mono_backend::timer_queue().on_monotonic_interrupt();
+        }
+    };
+}
+
+#[doc(hidden)]
+#[macro_export]
+macro_rules! __internal_create_nrf_rtc_struct {
+    ($name:ident, $mono_backend:ident, $timer:ident) => {
+        /// A `Monotonic` based on the nRF RTC peripheral.
+        struct $name;
+
+        impl $name {
+            /// Starts the `Monotonic`.
+            ///
+            /// This method must be called only once.
+            pub fn start(rtc: $crate::nrf::rtc::$timer) {
+                $crate::__internal_create_nrf_rtc_interrupt!($mono_backend, $timer);
+
+                $crate::nrf::rtc::$mono_backend::_start(rtc);
+            }
         }
 
-        pub struct $rtc_token;
+        impl $crate::TimerQueueBasedMonotonic for $name {
+            type Backend = $crate::nrf::rtc::$mono_backend;
+            type Instant = $crate::fugit::Instant<
+                <Self::Backend as $crate::TimerQueueBackend>::Ticks,
+                1,
+                32_768,
+            >;
+            type Duration = $crate::fugit::Duration<
+                <Self::Backend as $crate::TimerQueueBackend>::Ticks,
+                1,
+                32_768,
+            >;
+        }
 
-        unsafe impl $crate::InterruptToken<$crate::nrf::rtc::$mono_timer> for $rtc_token {}
-
-        $rtc_token
-    }};
+        $crate::rtic_time::impl_embedded_hal_delay_fugit!($name);
+        $crate::rtic_time::impl_embedded_hal_async_delay_fugit!($name);
+    };
 }
 
-/// Register the Rtc0 interrupt for the monotonic.
+/// Create an RTC0 based monotonic and register the RTC0 interrupt for it.
+///
+/// See [`crate::nrf::rtc`] for more details.
 #[macro_export]
-macro_rules! create_nrf_rtc0_monotonic_token {
-    () => {{
-        $crate::__internal_create_nrf_rtc_interrupt!(Rtc0, RTC0, Rtc0Token)
-    }};
+macro_rules! nrf_rtc0_monotonic {
+    ($name:ident) => {
+        $crate::__internal_create_nrf_rtc_struct!($name, Rtc0Backend, RTC0);
+    };
 }
 
-/// Register the Rtc1 interrupt for the monotonic.
+/// Create an RTC1 based monotonic and register the RTC1 interrupt for it.
+///
+/// See [`crate::nrf::rtc`] for more details.
 #[macro_export]
-macro_rules! create_nrf_rtc1_monotonic_token {
-    () => {{
-        $crate::__internal_create_nrf_rtc_interrupt!(Rtc1, RTC1, Rtc1Token)
-    }};
+macro_rules! nrf_rtc1_monotonic {
+    ($name:ident) => {
+        $crate::__internal_create_nrf_rtc_struct!($name, Rtc1Backend, RTC1);
+    };
 }
 
-/// Register the Rtc2 interrupt for the monotonic.
+/// Create an RTC2 based monotonic and register the RTC2 interrupt for it.
+///
+/// See [`crate::nrf::rtc`] for more details.
 #[cfg(any(feature = "nrf52832", feature = "nrf52833", feature = "nrf52840"))]
 #[cfg_attr(
     docsrs,
     doc(cfg(any(feature = "nrf52832", feature = "nrf52833", feature = "nrf52840")))
 )]
 #[macro_export]
-macro_rules! create_nrf_rtc2_monotonic_token {
-    () => {{
-        $crate::__internal_create_nrf_rtc_interrupt!(Rtc2, RTC2, Rtc2Token)
-    }};
+macro_rules! nrf_rtc2_monotonic {
+    ($name:ident) => {
+        $crate::__internal_create_nrf_rtc_struct!($name, Rtc2Backend, RTC2);
+    };
 }
 
 struct TimerValueU24(u32);
@@ -104,19 +160,23 @@ impl From<TimerValueU24> for u64 {
 }
 
 macro_rules! make_rtc {
-    ($mono_name:ident, $rtc:ident, $overflow:ident, $tq:ident$(, doc: ($($doc:tt)*))?) => {
-        /// Monotonic timer queue implementation.
+    ($backend_name:ident, $rtc:ident, $overflow:ident, $tq:ident$(, doc: ($($doc:tt)*))?) => {
+        /// RTC based [`TimerQueueBackend`].
         $(
             #[cfg_attr(docsrs, doc(cfg($($doc)*)))]
         )?
-        pub struct $mono_name;
+        pub struct $backend_name;
 
         static $overflow: AtomicU32 = AtomicU32::new(0);
-        static $tq: TimerQueue<$mono_name> = TimerQueue::new();
+        static $tq: TimerQueue<$backend_name> = TimerQueue::new();
 
-        impl $mono_name {
-            /// Start the timer monotonic.
-            pub fn start(rtc: $rtc, _interrupt_token: impl crate::InterruptToken<Self>) {
+        impl $backend_name {
+            /// Starts the timer.
+            ///
+            /// **Do not use this function directly.**
+            ///
+            /// Use the prelude macros instead.
+            pub fn _start(rtc: $rtc) {
                 unsafe { rtc.prescaler.write(|w| w.bits(0)) };
 
                 // Disable interrupts, as preparation
@@ -166,67 +226,21 @@ macro_rules! make_rtc {
                 // plus we are not using any external shared resources so we won't impact
                 // basepri/source masking based critical sections.
                 unsafe {
-                    crate::set_monotonic_prio(pac::NVIC_PRIO_BITS, Interrupt::$rtc);
-                    pac::NVIC::unmask(Interrupt::$rtc);
+                    crate::set_monotonic_prio(pac::NVIC_PRIO_BITS, pac::Interrupt::$rtc);
+                    pac::NVIC::unmask(pac::Interrupt::$rtc);
                 }
             }
-
-            /// Used to access the underlying timer queue
-            #[doc(hidden)]
-            pub fn __tq() -> &'static TimerQueue<$mono_name> {
-                &$tq
-            }
-
-            /// Timeout at a specific time.
-            #[inline]
-            pub async fn timeout_at<F: Future>(
-                instant: <Self as Monotonic>::Instant,
-                future: F,
-            ) -> Result<F::Output, TimeoutError> {
-                $tq.timeout_at(instant, future).await
-            }
-
-            /// Timeout after a specific duration.
-            #[inline]
-            pub async fn timeout_after<F: Future>(
-                duration: <Self as Monotonic>::Duration,
-                future: F,
-            ) -> Result<F::Output, TimeoutError> {
-                $tq.timeout_after(duration, future).await
-            }
-
-            /// Delay for some duration of time.
-            #[inline]
-            pub async fn delay(duration: <Self as Monotonic>::Duration) {
-                $tq.delay(duration).await;
-            }
-
-            /// Delay to some specific time instant.
-            #[inline]
-            pub async fn delay_until(instant: <Self as Monotonic>::Instant) {
-                $tq.delay_until(instant).await;
-            }
         }
 
+        impl TimerQueueBackend for $backend_name {
+            type Ticks = u64;
 
-        rtic_time::embedded_hal_delay_impl_fugit64!($mono_name);
-
-        #[cfg(feature = "embedded-hal-async")]
-        rtic_time::embedded_hal_async_delay_impl_fugit64!($mono_name);
-
-        impl Monotonic for $mono_name {
-            const ZERO: Self::Instant = Self::Instant::from_ticks(0);
-            const TICK_PERIOD: Self::Duration = Self::Duration::from_ticks(1);
-
-            type Instant = fugit::TimerInstantU64<32_768>;
-            type Duration = fugit::TimerDurationU64<32_768>;
-
-            fn now() -> Self::Instant {
+            fn now() -> Self::Ticks {
                 let rtc = unsafe { &*$rtc::PTR };
-                Self::Instant::from_ticks(calculate_now(
+                calculate_now(
                     || $overflow.load(Ordering::Relaxed),
                     || TimerValueU24(rtc.counter.read().bits())
-                ))
+                )
             }
 
             fn on_interrupt() {
@@ -243,28 +257,35 @@ macro_rules! make_rtc {
                 }
             }
 
-            fn enable_timer() {}
-
-            fn disable_timer() {}
-
-            fn set_compare(mut instant: Self::Instant) {
+            fn set_compare(mut instant: Self::Ticks) {
                 let rtc = unsafe { &*$rtc::PTR };
 
+                const MAX: u64 = 0xff_ffff;
+
                 // Disable interrupts because this section is timing critical.
                 // We rely on the fact that this entire section runs within one
                 // RTC clock tick. (which it will do easily if it doesn't get
                 // interrupted)
                 critical_section::with(|_|{
                     let now = Self::now();
-                    if let Some(diff) = instant.checked_duration_since(now) {
+                    // wrapping_sub deals with the u64 overflow corner case
+                    let diff = instant.wrapping_sub(now);
+                    let val = if diff <= MAX {
+                        // Now we know `instant` whill happen within one `MAX` time duration.
+
                         // Errata: Timer interrupts don't fire if they are scheduled less than
                         // two ticks in the future. Make it three, because the timer could
                         // tick right now.
-                        if diff.ticks() < 3 {
-                            instant = Self::Instant::from_ticks(now.ticks().wrapping_add(3));
+                        if diff < 3 {
+                            instant = now.wrapping_add(3);
                         }
-                        unsafe { rtc.cc[0].write(|w| w.bits(instant.ticks() as u32 & 0xff_ffff)) };
-                    }
+
+                        (instant & MAX) as u32
+                    } else {
+                        0
+                    };
+
+                    unsafe { rtc.cc[0].write(|w| w.bits(val)) };
                 });
             }
 
@@ -274,13 +295,17 @@ macro_rules! make_rtc {
             }
 
             fn pend_interrupt() {
-                pac::NVIC::pend(Interrupt::$rtc);
+                pac::NVIC::pend(pac::Interrupt::$rtc);
+            }
+
+            fn timer_queue() -> &'static TimerQueue<Self> {
+                &$tq
             }
         }
     };
 }
 
-make_rtc!(Rtc0, RTC0, RTC0_OVERFLOWS, RTC0_TQ);
-make_rtc!(Rtc1, RTC1, RTC1_OVERFLOWS, RTC1_TQ);
+make_rtc!(Rtc0Backend, RTC0, RTC0_OVERFLOWS, RTC0_TQ);
+make_rtc!(Rtc1Backend, RTC1, RTC1_OVERFLOWS, RTC1_TQ);
 #[cfg(any(feature = "nrf52832", feature = "nrf52833", feature = "nrf52840"))]
-make_rtc!(Rtc2, RTC2, RTC2_OVERFLOWS, RTC2_TQ, doc: (any(feature = "nrf52832", feature = "nrf52833", feature = "nrf52840")));
+make_rtc!(Rtc2Backend, RTC2, RTC2_OVERFLOWS, RTC2_TQ, doc: (any(feature = "nrf52832", feature = "nrf52833", feature = "nrf52840")));

rtic-monotonics/src/nrf/timer.rs

@@ -1,4 +1,4 @@
-//! [`Monotonic`] impl for the 32-bit timers of the nRF series.
+//! [`Monotonic`](rtic_time::Monotonic) implementation for the 32-bit timers of the nRF series.
 //!
 //! Not all timers are available on all parts. Ensure that only the available
 //! timers are exposed by having the correct `nrf52*` feature enabled for `rtic-monotonics`.
@@ -6,139 +6,217 @@
 //! # Example
 //!
 //! ```
-//! use rtic_monotonics::nrf::timer::*;
+//! use rtic_monotonics::nrf::timer::prelude::*;
+//! nrf_timer0_monotonic!(Mono);
 //!
 //! fn init() {
 //!     # // This is normally provided by the selected PAC
 //!     # let timer = unsafe { core::mem::transmute(()) };
-//!     // Generate the required token
-//!     let token = rtic_monotonics::create_nrf_timer0_monotonic_token!();
-//!
 //!     // Start the monotonic
-//!     Timer0::start(timer, token);
+//!     Mono::start(timer);
 //! }
 //!
 //! async fn usage() {
 //!     loop {
 //!          // Use the monotonic
-//!          Timer0::delay(100.millis()).await;
+//!          let timestamp = Mono::now();
+//!          Mono::delay(100.millis()).await;
 //!     }
 //! }
 //! ```
 
-use crate::{Monotonic, TimeoutError, TimerQueue};
-use atomic_polyfill::{AtomicU32, Ordering};
-use core::future::Future;
-pub use fugit::{self, ExtU64, ExtU64Ceil};
-use rtic_time::half_period_counter::calculate_now;
+/// Common definitions and traits for using the nRF Timer monotonics
+pub mod prelude {
+    pub use crate::nrf_timer0_monotonic;
+    pub use crate::nrf_timer1_monotonic;
+    pub use crate::nrf_timer2_monotonic;
+    #[cfg(any(feature = "nrf52832", feature = "nrf52833", feature = "nrf52840"))]
+    pub use crate::nrf_timer3_monotonic;
+    #[cfg(any(feature = "nrf52832", feature = "nrf52833", feature = "nrf52840"))]
+    pub use crate::nrf_timer4_monotonic;
+
+    pub use crate::Monotonic;
+    pub use fugit::{self, ExtU64, ExtU64Ceil};
+}
 
 #[cfg(feature = "nrf52810")]
-use nrf52810_pac::{self as pac, Interrupt, TIMER0, TIMER1, TIMER2};
+#[doc(hidden)]
+pub use nrf52810_pac::{self as pac, TIMER0, TIMER1, TIMER2};
 #[cfg(feature = "nrf52811")]
-use nrf52811_pac::{self as pac, Interrupt, TIMER0, TIMER1, TIMER2};
+#[doc(hidden)]
+pub use nrf52811_pac::{self as pac, TIMER0, TIMER1, TIMER2};
 #[cfg(feature = "nrf52832")]
-use nrf52832_pac::{self as pac, Interrupt, TIMER0, TIMER1, TIMER2, TIMER3, TIMER4};
+#[doc(hidden)]
+pub use nrf52832_pac::{self as pac, TIMER0, TIMER1, TIMER2, TIMER3, TIMER4};
 #[cfg(feature = "nrf52833")]
-use nrf52833_pac::{self as pac, Interrupt, TIMER0, TIMER1, TIMER2, TIMER3, TIMER4};
+#[doc(hidden)]
+pub use nrf52833_pac::{self as pac, TIMER0, TIMER1, TIMER2, TIMER3, TIMER4};
 #[cfg(feature = "nrf52840")]
-use nrf52840_pac::{self as pac, Interrupt, TIMER0, TIMER1, TIMER2, TIMER3, TIMER4};
+#[doc(hidden)]
+pub use nrf52840_pac::{self as pac, TIMER0, TIMER1, TIMER2, TIMER3, TIMER4};
 #[cfg(feature = "nrf5340-app")]
-use nrf5340_app_pac::{
-    self as pac, Interrupt, TIMER0_NS as TIMER0, TIMER1_NS as TIMER1, TIMER2_NS as TIMER2,
+#[doc(hidden)]
+pub use nrf5340_app_pac::{
+    self as pac, TIMER0_NS as TIMER0, TIMER1_NS as TIMER1, TIMER2_NS as TIMER2,
 };
 #[cfg(feature = "nrf5340-net")]
-use nrf5340_net_pac::{
-    self as pac, Interrupt, TIMER0_NS as TIMER0, TIMER1_NS as TIMER1, TIMER2_NS as TIMER2,
+#[doc(hidden)]
+pub use nrf5340_net_pac::{
+    self as pac, TIMER0_NS as TIMER0, TIMER1_NS as TIMER1, TIMER2_NS as TIMER2,
 };
 #[cfg(feature = "nrf9160")]
-use nrf9160_pac::{
-    self as pac, Interrupt, TIMER0_NS as TIMER0, TIMER1_NS as TIMER1, TIMER2_NS as TIMER2,
+#[doc(hidden)]
+pub use nrf9160_pac::{self as pac, TIMER0_NS as TIMER0, TIMER1_NS as TIMER1, TIMER2_NS as TIMER2};
+
+use atomic_polyfill::{AtomicU32, Ordering};
+use rtic_time::{
+    half_period_counter::calculate_now,
+    timer_queue::{TimerQueue, TimerQueueBackend},
 };
 
 #[doc(hidden)]
 #[macro_export]
 macro_rules! __internal_create_nrf_timer_interrupt {
-    ($mono_timer:ident, $timer:ident, $timer_token:ident) => {{
+    ($mono_backend:ident, $timer:ident) => {
         #[no_mangle]
         #[allow(non_snake_case)]
         unsafe extern "C" fn $timer() {
-            $crate::nrf::timer::$mono_timer::__tq().on_monotonic_interrupt();
+            use $crate::TimerQueueBackend;
+            $crate::nrf::timer::$mono_backend::timer_queue().on_monotonic_interrupt();
+        }
+    };
+}
+
+#[doc(hidden)]
+#[macro_export]
+macro_rules! __internal_create_nrf_timer_struct {
+    ($name:ident, $mono_backend:ident, $timer:ident, $tick_rate_hz:expr) => {
+        /// A `Monotonic` based on the nRF Timer peripheral.
+        struct $name;
+
+        impl $name {
+            /// Starts the `Monotonic`.
+            ///
+            /// This method must be called only once.
+            pub fn start(timer: $crate::nrf::timer::$timer) {
+                $crate::__internal_create_nrf_timer_interrupt!($mono_backend, $timer);
+
+                const PRESCALER: u8 = match $tick_rate_hz {
+                    16_000_000 => 0,
+                    8_000_000 => 1,
+                    4_000_000 => 2,
+                    2_000_000 => 3,
+                    1_000_000 => 4,
+                    500_000 => 5,
+                    250_000 => 6,
+                    125_000 => 7,
+                    62_500 => 8,
+                    31_250 => 9,
+                    _ => panic!("Timer cannot run at desired tick rate!"),
+                };
+
+                $crate::nrf::timer::$mono_backend::_start(timer, PRESCALER);
+            }
         }
 
-        pub struct $timer_token;
+        impl $crate::TimerQueueBasedMonotonic for $name {
+            type Backend = $crate::nrf::timer::$mono_backend;
+            type Instant = $crate::fugit::Instant<
+                <Self::Backend as $crate::TimerQueueBackend>::Ticks,
+                1,
+                { $tick_rate_hz },
+            >;
+            type Duration = $crate::fugit::Duration<
+                <Self::Backend as $crate::TimerQueueBackend>::Ticks,
+                1,
+                { $tick_rate_hz },
+            >;
+        }
 
-        unsafe impl $crate::InterruptToken<$crate::nrf::timer::$mono_timer> for $timer_token {}
-
-        $timer_token
-    }};
+        $crate::rtic_time::impl_embedded_hal_delay_fugit!($name);
+        $crate::rtic_time::impl_embedded_hal_async_delay_fugit!($name);
+    };
 }
 
-/// Register the Timer0 interrupt for the monotonic.
+/// Create an Timer0 based monotonic and register the TIMER0 interrupt for it.
+///
+/// See [`crate::nrf::timer`] for more details.
 #[macro_export]
-macro_rules! create_nrf_timer0_monotonic_token {
-    () => {{
-        $crate::__internal_create_nrf_timer_interrupt!(Timer0, TIMER0, Timer0Token)
-    }};
+macro_rules! nrf_timer0_monotonic {
+    ($name:ident, $tick_rate_hz:expr) => {
+        $crate::__internal_create_nrf_timer_struct!($name, Timer0Backend, TIMER0, $tick_rate_hz);
+    };
 }
 
-/// Register the Timer1 interrupt for the monotonic.
+/// Create an Timer1 based monotonic and register the TIMER1 interrupt for it.
+///
+/// See [`crate::nrf::timer`] for more details.
 #[macro_export]
-macro_rules! create_nrf_timer1_monotonic_token {
-    () => {{
-        $crate::__internal_create_nrf_timer_interrupt!(Timer1, TIMER1, Timer1Token)
-    }};
+macro_rules! nrf_timer1_monotonic {
+    ($name:ident, $tick_rate_hz:expr) => {
+        $crate::__internal_create_nrf_timer_struct!($name, Timer1Backend, TIMER1, $tick_rate_hz);
+    };
 }
 
-/// Register the Timer2 interrupt for the monotonic.
+/// Create an Timer2 based monotonic and register the TIMER2 interrupt for it.
+///
+/// See [`crate::nrf::timer`] for more details.
 #[macro_export]
-macro_rules! create_nrf_timer2_monotonic_token {
-    () => {{
-        $crate::__internal_create_nrf_timer_interrupt!(Timer2, TIMER2, Timer2Token)
-    }};
+macro_rules! nrf_timer2_monotonic {
+    ($name:ident, $tick_rate_hz:expr) => {
+        $crate::__internal_create_nrf_timer_struct!($name, Timer2Backend, TIMER2, $tick_rate_hz);
+    };
 }
 
-/// Register the Timer3 interrupt for the monotonic.
+/// Create an Timer3 based monotonic and register the TIMER3 interrupt for it.
+///
+/// See [`crate::nrf::timer`] for more details.
 #[cfg_attr(
     docsrs,
     doc(cfg(any(feature = "nrf52832", feature = "nrf52833", feature = "nrf52840")))
 )]
 #[cfg(any(feature = "nrf52832", feature = "nrf52833", feature = "nrf52840"))]
 #[macro_export]
-macro_rules! create_nrf_timer3_monotonic_token {
-    () => {{
-        $crate::__internal_create_nrf_timer_interrupt!(Timer3, TIMER3, Timer3Token)
-    }};
+macro_rules! nrf_timer3_monotonic {
+    ($name:ident, $tick_rate_hz:expr) => {
+        $crate::__internal_create_nrf_timer_struct!($name, Timer3Backend, TIMER3, $tick_rate_hz);
+    };
 }
 
-/// Register the Timer4 interrupt for the monotonic.
+/// Create an Timer4 based monotonic and register the TIMER4 interrupt for it.
+///
+/// See [`crate::nrf::timer`] for more details.
 #[cfg_attr(
     docsrs,
     doc(cfg(any(feature = "nrf52832", feature = "nrf52833", feature = "nrf52840")))
 )]
 #[cfg(any(feature = "nrf52832", feature = "nrf52833", feature = "nrf52840"))]
 #[macro_export]
-macro_rules! create_nrf_timer4_monotonic_token {
-    () => {{
-        $crate::__internal_create_nrf_timer_interrupt!(Timer4, TIMER4, Timer4Token)
-    }};
+macro_rules! nrf_timer4_monotonic {
+    ($name:ident, $tick_rate_hz:expr) => {
+        $crate::__internal_create_nrf_timer_struct!($name, Timer4Backend, TIMER4, $tick_rate_hz);
+    };
 }
 
 macro_rules! make_timer {
-    ($mono_name:ident, $timer:ident, $overflow:ident, $tq:ident$(, doc: ($($doc:tt)*))?) => {
-        /// Monotonic timer queue implementation.
+    ($backend_name:ident, $timer:ident, $overflow:ident, $tq:ident$(, doc: ($($doc:tt)*))?) => {
+        /// Timer peripheral based [`TimerQueueBackend`].
         $(
             #[cfg_attr(docsrs, doc(cfg($($doc)*)))]
         )?
-        pub struct $mono_name;
+        pub struct $backend_name;
 
         static $overflow: AtomicU32 = AtomicU32::new(0);
-        static $tq: TimerQueue<$mono_name> = TimerQueue::new();
+        static $tq: TimerQueue<$backend_name> = TimerQueue::new();
 
-        impl $mono_name {
-            /// Start the timer monotonic.
-            pub fn start(timer: $timer, _interrupt_token: impl crate::InterruptToken<Self>) {
-                // 1 MHz
-                timer.prescaler.write(|w| unsafe { w.prescaler().bits(4) });
+        impl $backend_name {
+            /// Starts the timer.
+            ///
+            /// **Do not use this function directly.**
+            ///
+            /// Use the prelude macros instead.
+            pub fn _start(timer: $timer, prescaler: u8) {
+                timer.prescaler.write(|w| unsafe { w.prescaler().bits(prescaler) });
                 timer.bitmode.write(|w| w.bitmode()._32bit());
 
                 // Disable interrupts, as preparation
@@ -184,70 +262,25 @@ macro_rules! make_timer {
                 // plus we are not using any external shared resources so we won't impact
                 // basepri/source masking based critical sections.
                 unsafe {
-                    crate::set_monotonic_prio(pac::NVIC_PRIO_BITS, Interrupt::$timer);
-                    pac::NVIC::unmask(Interrupt::$timer);
+                    crate::set_monotonic_prio(pac::NVIC_PRIO_BITS, pac::Interrupt::$timer);
+                    pac::NVIC::unmask(pac::Interrupt::$timer);
                 }
             }
-
-            /// Used to access the underlying timer queue
-            #[doc(hidden)]
-            pub fn __tq() -> &'static TimerQueue<$mono_name> {
-                &$tq
-            }
-
-            /// Timeout at a specific time.
-            #[inline]
-            pub async fn timeout_at<F: Future>(
-                instant: <Self as Monotonic>::Instant,
-                future: F,
-            ) -> Result<F::Output, TimeoutError> {
-                $tq.timeout_at(instant, future).await
-            }
-
-            /// Timeout after a specific duration.
-            #[inline]
-            pub async fn timeout_after<F: Future>(
-                duration: <Self as Monotonic>::Duration,
-                future: F,
-            ) -> Result<F::Output, TimeoutError> {
-                $tq.timeout_after(duration, future).await
-            }
-
-            /// Delay for some duration of time.
-            #[inline]
-            pub async fn delay(duration: <Self as Monotonic>::Duration) {
-                $tq.delay(duration).await;
-            }
-
-            /// Delay to some specific time instant.
-            #[inline]
-            pub async fn delay_until(instant: <Self as Monotonic>::Instant) {
-                $tq.delay_until(instant).await;
-            }
         }
 
-        rtic_time::embedded_hal_delay_impl_fugit64!($mono_name);
+        impl TimerQueueBackend for $backend_name {
+            type Ticks = u64;
 
-        #[cfg(feature = "embedded-hal-async")]
-        rtic_time::embedded_hal_async_delay_impl_fugit64!($mono_name);
-
-        impl Monotonic for $mono_name {
-            const ZERO: Self::Instant = Self::Instant::from_ticks(0);
-            const TICK_PERIOD: Self::Duration = Self::Duration::from_ticks(1);
-
-            type Instant = fugit::TimerInstantU64<1_000_000>;
-            type Duration = fugit::TimerDurationU64<1_000_000>;
-
-            fn now() -> Self::Instant {
+            fn now() -> Self::Ticks {
                 let timer = unsafe { &*$timer::PTR };
 
-                Self::Instant::from_ticks(calculate_now(
+                calculate_now(
                     || $overflow.load(Ordering::Relaxed),
                     || {
                         timer.tasks_capture[3].write(|w| unsafe { w.bits(1) });
                         timer.cc[3].read().bits()
                     }
-                ))
+                )
             }
 
             fn on_interrupt() {
@@ -268,9 +301,9 @@ macro_rules! make_timer {
                 }
             }
 
-            fn set_compare(instant: Self::Instant) {
+            fn set_compare(instant: Self::Ticks) {
                 let timer = unsafe { &*$timer::PTR };
-                timer.cc[0].write(|w| unsafe { w.cc().bits(instant.ticks() as u32) });
+                timer.cc[0].write(|w| unsafe { w.cc().bits(instant as u32) });
             }
 
             fn clear_compare_flag() {
@@ -279,16 +312,20 @@ macro_rules! make_timer {
             }
 
             fn pend_interrupt() {
-                pac::NVIC::pend(Interrupt::$timer);
+                pac::NVIC::pend(pac::Interrupt::$timer);
+            }
+
+            fn timer_queue() -> &'static TimerQueue<$backend_name> {
+                &$tq
             }
         }
     };
 }
 
-make_timer!(Timer0, TIMER0, TIMER0_OVERFLOWS, TIMER0_TQ);
-make_timer!(Timer1, TIMER1, TIMER1_OVERFLOWS, TIMER1_TQ);
-make_timer!(Timer2, TIMER2, TIMER2_OVERFLOWS, TIMER2_TQ);
+make_timer!(Timer0Backend, TIMER0, TIMER0_OVERFLOWS, TIMER0_TQ);
+make_timer!(Timer1Backend, TIMER1, TIMER1_OVERFLOWS, TIMER1_TQ);
+make_timer!(Timer2Backend, TIMER2, TIMER2_OVERFLOWS, TIMER2_TQ);
 #[cfg(any(feature = "nrf52832", feature = "nrf52833", feature = "nrf52840"))]
-make_timer!(Timer3, TIMER3, TIMER3_OVERFLOWS, TIMER3_TQ, doc: (any(feature = "nrf52832", feature = "nrf52833", feature = "nrf52840")));
+make_timer!(Timer3Backend, TIMER3, TIMER3_OVERFLOWS, TIMER3_TQ, doc: (any(feature = "nrf52832", feature = "nrf52833", feature = "nrf52840")));
 #[cfg(any(feature = "nrf52832", feature = "nrf52833", feature = "nrf52840"))]
-make_timer!(Timer4, TIMER4, TIMER4_OVERFLOWS, TIMER4_TQ, doc: (any(feature = "nrf52832", feature = "nrf52833", feature = "nrf52840")));
+make_timer!(Timer4Backend, TIMER4, TIMER4_OVERFLOWS, TIMER4_TQ, doc: (any(feature = "nrf52832", feature = "nrf52833", feature = "nrf52840")));

rtic-monotonics/src/rp2040.rs

@@ -1,46 +1,56 @@
-//! [`Monotonic`] implementation for RP2040's Timer peripheral.
+//! [`Monotonic`](rtic_time::Monotonic) implementation for RP2040's Timer peripheral.
+//!
+//! Always runs at a fixed rate of 1 MHz.
 //!
 //! # Example
 //!
 //! ```
-//! use rtic_monotonics::rp2040::*;
+//! use rtic_monotonics::rp2040::prelude::*;
+//!
+//! rp2040_timer_monotonic!(Mono);
 //!
 //! fn init() {
 //!     # // This is normally provided by the selected PAC
 //!     # let timer = unsafe { core::mem::transmute(()) };
 //!     # let mut resets = unsafe { core::mem::transmute(()) };
-//!     // Generate the required token
-//!     let token = rtic_monotonics::create_rp2040_monotonic_token!();
-//!
+//!     #
 //!     // Start the monotonic
-//!     Timer::start(timer, &mut resets, token);
+//!     Mono::start(timer, &mut resets);
 //! }
 //!
 //! async fn usage() {
 //!     loop {
 //!          // Use the monotonic
-//!          Timer::delay(100.millis()).await;
+//!          let timestamp = Mono::now();
+//!          Mono::delay(100.millis()).await;
 //!     }
 //! }
 //! ```
 
-use super::Monotonic;
+/// Common definitions and traits for using the RP2040 timer monotonic
+pub mod prelude {
+    pub use crate::rp2040_timer_monotonic;
 
-pub use super::{TimeoutError, TimerQueue};
-use core::future::Future;
-pub use fugit::{self, ExtU64, ExtU64Ceil};
-use rp2040_pac::{timer, Interrupt, NVIC, RESETS, TIMER};
+    pub use crate::Monotonic;
 
-/// Timer implementing [`Monotonic`] which runs at 1 MHz.
-pub struct Timer;
+    pub use fugit::{self, ExtU64, ExtU64Ceil};
+}
 
-impl Timer {
-    /// Start a `Monotonic` based on RP2040's Timer.
-    pub fn start(
-        timer: TIMER,
-        resets: &RESETS,
-        _interrupt_token: impl crate::InterruptToken<Self>,
-    ) {
+use crate::TimerQueueBackend;
+use rp2040_pac::{timer, Interrupt, NVIC};
+pub use rp2040_pac::{RESETS, TIMER};
+use rtic_time::timer_queue::TimerQueue;
+
+/// Timer implementing [`TimerQueueBackend`].
+pub struct TimerBackend;
+
+impl TimerBackend {
+    /// Starts the monotonic timer.
+    ///
+    /// **Do not use this function directly.**
+    ///
+    /// Use the prelude macros instead.
+    pub fn _start(timer: TIMER, resets: &RESETS) {
         resets.reset.modify(|_, w| w.timer().clear_bit());
         while resets.reset_done.read().timer().bit_is_clear() {}
         timer.inte.modify(|_, w| w.alarm_0().bit(true));
@@ -58,55 +68,12 @@ impl Timer {
     }
 }
 
-static TIMER_QUEUE: TimerQueue<Timer> = TimerQueue::new();
+static TIMER_QUEUE: TimerQueue<TimerBackend> = TimerQueue::new();
 
-// Forward timerqueue interface
-impl Timer {
-    /// Used to access the underlying timer queue
-    #[doc(hidden)]
-    pub fn __tq() -> &'static TimerQueue<Timer> {
-        &TIMER_QUEUE
-    }
+impl TimerQueueBackend for TimerBackend {
+    type Ticks = u64;
 
-    /// Timeout at a specific time.
-    #[inline]
-    pub async fn timeout_at<F: Future>(
-        instant: <Self as Monotonic>::Instant,
-        future: F,
-    ) -> Result<F::Output, TimeoutError> {
-        TIMER_QUEUE.timeout_at(instant, future).await
-    }
-
-    /// Timeout after a specific duration.
-    #[inline]
-    pub async fn timeout_after<F: Future>(
-        duration: <Self as Monotonic>::Duration,
-        future: F,
-    ) -> Result<F::Output, TimeoutError> {
-        TIMER_QUEUE.timeout_after(duration, future).await
-    }
-
-    /// Delay for some duration of time.
-    #[inline]
-    pub async fn delay(duration: <Self as Monotonic>::Duration) {
-        TIMER_QUEUE.delay(duration).await;
-    }
-
-    /// Delay to some specific time instant.
-    #[inline]
-    pub async fn delay_until(instant: <Self as Monotonic>::Instant) {
-        TIMER_QUEUE.delay_until(instant).await;
-    }
-}
-
-impl Monotonic for Timer {
-    type Instant = fugit::TimerInstantU64<1_000_000>;
-    type Duration = fugit::TimerDurationU64<1_000_000>;
-
-    const ZERO: Self::Instant = Self::Instant::from_ticks(0);
-    const TICK_PERIOD: Self::Duration = Self::Duration::from_ticks(1);
-
-    fn now() -> Self::Instant {
+    fn now() -> Self::Ticks {
         let timer = Self::timer();
 
         let mut hi0 = timer.timerawh.read().bits();
@@ -114,22 +81,24 @@ impl Monotonic for Timer {
             let low = timer.timerawl.read().bits();
             let hi1 = timer.timerawh.read().bits();
             if hi0 == hi1 {
-                break Self::Instant::from_ticks((u64::from(hi0) << 32) | u64::from(low));
+                break ((u64::from(hi0) << 32) | u64::from(low));
             }
             hi0 = hi1;
         }
     }
 
-    fn set_compare(instant: Self::Instant) {
+    fn set_compare(instant: Self::Ticks) {
         let now = Self::now();
 
-        let max = u32::MAX as u64;
+        const MAX: u64 = u32::MAX as u64;
 
         // Since the timer may or may not overflow based on the requested compare val, we check
         // how many ticks are left.
-        let val = match instant.checked_duration_since(now) {
-            Some(x) if x.ticks() <= max => instant.duration_since_epoch().ticks() & max, // Will not overflow
-            _ => 0, // Will overflow or in the past, set the same value as after overflow to not get extra interrupts
+        // `wrapping_sup` takes care of the u64 integer overflow special case.
+        let val = if instant.wrapping_sub(now) <= MAX {
+            instant & MAX
+        } else {
+            0
         };
 
         Self::timer()
@@ -145,32 +114,55 @@ impl Monotonic for Timer {
         rp2040_pac::NVIC::pend(Interrupt::TIMER_IRQ_0);
     }
 
-    fn on_interrupt() {}
-
-    fn enable_timer() {}
-
-    fn disable_timer() {}
+    fn timer_queue() -> &'static TimerQueue<Self> {
+        &TIMER_QUEUE
+    }
 }
 
-rtic_time::embedded_hal_delay_impl_fugit64!(Timer);
-
-#[cfg(feature = "embedded-hal-async")]
-rtic_time::embedded_hal_async_delay_impl_fugit64!(Timer);
-
-/// Register the Timer interrupt for the monotonic.
+/// Create an RP2040 timer based monotonic and register the necessary interrupt for it.
+///
+/// See [`crate::rp2040`] for more details.
+///
+/// # Arguments
+///
+/// * `name` - The name that the monotonic type will have.
 #[macro_export]
-macro_rules! create_rp2040_monotonic_token {
-    () => {{
-        #[no_mangle]
-        #[allow(non_snake_case)]
-        unsafe extern "C" fn TIMER_IRQ_0() {
-            $crate::rp2040::Timer::__tq().on_monotonic_interrupt();
+macro_rules! rp2040_timer_monotonic {
+    ($name:ident) => {
+        /// A `Monotonic` based on the RP2040 Timer peripheral.
+        struct $name;
+
+        impl $name {
+            /// Starts the `Monotonic`.
+            ///
+            /// This method must be called only once.
+            pub fn start(timer: $crate::rp2040::TIMER, resets: &$crate::rp2040::RESETS) {
+                #[no_mangle]
+                #[allow(non_snake_case)]
+                unsafe extern "C" fn TIMER_IRQ_0() {
+                    use $crate::TimerQueueBackend;
+                    $crate::rp2040::TimerBackend::timer_queue().on_monotonic_interrupt();
+                }
+
+                $crate::rp2040::TimerBackend::_start(timer, resets);
+            }
         }
 
-        pub struct Rp2040Token;
+        impl $crate::TimerQueueBasedMonotonic for $name {
+            type Backend = $crate::rp2040::TimerBackend;
+            type Instant = $crate::fugit::Instant<
+                <Self::Backend as $crate::TimerQueueBackend>::Ticks,
+                1,
+                1_000_000,
+            >;
+            type Duration = $crate::fugit::Duration<
+                <Self::Backend as $crate::TimerQueueBackend>::Ticks,
+                1,
+                1_000_000,
+            >;
+        }
 
-        unsafe impl $crate::InterruptToken<$crate::rp2040::Timer> for Rp2040Token {}
-
-        Rp2040Token
-    }};
+        $crate::rtic_time::impl_embedded_hal_delay_fugit!($name);
+        $crate::rtic_time::impl_embedded_hal_async_delay_fugit!($name);
+    };
 }

rtic-monotonics/src/stm32.rs

@@ -1,4 +1,4 @@
-//! [`Monotonic`] impl for the STM32.
+//! [`Monotonic`](rtic_time::Monotonic) implementations for STM32 chips.
 //!
 //! Not all timers are available on all parts. Ensure that only available
 //! timers are exposed by having the correct `stm32*` feature enabled for `rtic-monotonics`.
@@ -6,38 +6,56 @@
 //! # Example
 //!
 //! ```
-//! use rtic_monotonics::stm32::*;
-//! use rtic_monotonics::stm32::Tim2 as Mono;
-//! use rtic_monotonics::Monotonic;
-//! use embassy_stm32::peripherals::TIM2;
-//! use embassy_stm32::rcc::low_level::RccPeripheral;
+//! use rtic_monotonics::stm32::prelude::*;
+//!
+//! // Define the monotonic and set it to 1MHz tick rate
+//! stm32_tim2_monotonic!(Mono, 1_000_000);
 //!
 //! fn init() {
-//!     // Generate timer token to ensure correct timer interrupt handler is used.
-//!     let token = rtic_monotonics::create_stm32_tim2_monotonic_token!();
-//!
 //!     // If using `embassy-stm32` HAL, timer clock can be read out like this:
-//!     let timer_clock_hz = TIM2::frequency();
+//!     let timer_clock_hz = embassy_stm32::peripherals::TIM2::frequency();
 //!     // Or define it manually if you are using other HAL or know correct frequency:
 //!     let timer_clock_hz = 64_000_000;
 //!
 //!     // Start the monotonic
-//!     Mono::start(timer_clock_hz, token);
+//!     Mono::start(timer_clock_hz);
 //! }
 //!
 //! async fn usage() {
 //!     loop {
 //!          // Use the monotonic
-//!          let timestamp = Mono::now().ticks();
+//!          let timestamp = Mono::now();
 //!          Mono::delay(100.millis()).await;
 //!     }
 //! }
 //! ```
 
-use crate::{Monotonic, TimeoutError, TimerQueue};
+/// Common definitions and traits for using the STM32 monotonics
+pub mod prelude {
+    #[cfg(feature = "stm32_tim2")]
+    pub use crate::stm32_tim2_monotonic;
+
+    #[cfg(feature = "stm32_tim3")]
+    pub use crate::stm32_tim3_monotonic;
+
+    #[cfg(feature = "stm32_tim4")]
+    pub use crate::stm32_tim4_monotonic;
+
+    #[cfg(feature = "stm32_tim5")]
+    pub use crate::stm32_tim5_monotonic;
+
+    #[cfg(feature = "stm32_tim15")]
+    pub use crate::stm32_tim15_monotonic;
+
+    pub use crate::Monotonic;
+    pub use fugit::{self, ExtU64, ExtU64Ceil};
+}
+
 use atomic_polyfill::{AtomicU64, Ordering};
-pub use fugit::{self, ExtU64, ExtU64Ceil};
-use rtic_time::half_period_counter::calculate_now;
+use rtic_time::{
+    half_period_counter::calculate_now,
+    timer_queue::{TimerQueue, TimerQueueBackend},
+};
 use stm32_metapac as pac;
 
 mod _generated {
@@ -48,116 +66,180 @@ mod _generated {
     include!(concat!(env!("OUT_DIR"), "/_generated.rs"));
 }
 
-const TIMER_HZ: u32 = 1_000_000;
-
 #[doc(hidden)]
 #[macro_export]
 macro_rules! __internal_create_stm32_timer_interrupt {
-    ($mono_timer:ident, $timer:ident, $timer_token:ident) => {{
+    ($mono_backend:ident, $interrupt_name:ident) => {
         #[no_mangle]
         #[allow(non_snake_case)]
-        unsafe extern "C" fn $timer() {
-            $crate::stm32::$mono_timer::__tq().on_monotonic_interrupt();
+        unsafe extern "C" fn $interrupt_name() {
+            use $crate::TimerQueueBackend;
+            $crate::stm32::$mono_backend::timer_queue().on_monotonic_interrupt();
+        }
+    };
+}
+
+#[doc(hidden)]
+#[macro_export]
+macro_rules! __internal_create_stm32_timer_struct {
+    ($name:ident, $mono_backend:ident, $timer:ident, $tick_rate_hz:expr) => {
+        struct $name;
+
+        impl $name {
+            /// Starts the `Monotonic`.
+            ///
+            /// - `tim_clock_hz`: `TIMx` peripheral clock frequency.
+            ///
+            /// Panics if it is impossible to achieve the desired monotonic tick rate based
+            /// on the given `tim_clock_hz` parameter. If that happens, adjust the desired monotonic tick rate.
+            ///
+            /// This method must be called only once.
+            pub fn start(tim_clock_hz: u32) {
+                $crate::__internal_create_stm32_timer_interrupt!($mono_backend, $timer);
+
+                $crate::stm32::$mono_backend::_start(tim_clock_hz, $tick_rate_hz);
+            }
         }
 
-        pub struct $timer_token;
+        impl $crate::TimerQueueBasedMonotonic for $name {
+            type Backend = $crate::stm32::$mono_backend;
+            type Instant = $crate::fugit::Instant<
+                <Self::Backend as $crate::TimerQueueBackend>::Ticks,
+                1,
+                { $tick_rate_hz },
+            >;
+            type Duration = $crate::fugit::Duration<
+                <Self::Backend as $crate::TimerQueueBackend>::Ticks,
+                1,
+                { $tick_rate_hz },
+            >;
+        }
 
-        unsafe impl $crate::InterruptToken<$crate::stm32::$mono_timer> for $timer_token {}
-
-        $timer_token
-    }};
+        $crate::rtic_time::impl_embedded_hal_delay_fugit!($name);
+        $crate::rtic_time::impl_embedded_hal_async_delay_fugit!($name);
+    };
 }
 
-/// Register TIM2 interrupt for the monotonic.
+/// Create a TIM2 based monotonic and register the TIM2 interrupt for it.
+///
+/// See [`crate::stm32`] for more details.
+///
+/// # Arguments
+///
+/// * `name` - The name that the monotonic type will have.
+/// * `tick_rate_hz` - The tick rate of the timer peripheral.
+///
 #[cfg(feature = "stm32_tim2")]
 #[macro_export]
-macro_rules! create_stm32_tim2_monotonic_token {
-    () => {{
-        $crate::__internal_create_stm32_timer_interrupt!(Tim2, TIM2, Tim2Token)
-    }};
+macro_rules! stm32_tim2_monotonic {
+    ($name:ident, $tick_rate_hz:expr) => {
+        $crate::__internal_create_stm32_timer_struct!($name, Tim2Backend, TIM2, $tick_rate_hz);
+    };
 }
 
-/// Register TIM3 interrupt for the monotonic.
+/// Create a TIM3 based monotonic and register the TIM3 interrupt for it.
+///
+/// See [`crate::stm32`] for more details.
+///
+/// # Arguments
+///
+/// * `name` - The name that the monotonic type will have.
+/// * `tick_rate_hz` - The tick rate of the timer peripheral.
+///
 #[cfg(feature = "stm32_tim3")]
 #[macro_export]
-macro_rules! create_stm32_tim3_monotonic_token {
-    () => {{
-        $crate::__internal_create_stm32_timer_interrupt!(Tim3, TIM3, Tim3Token)
-    }};
+macro_rules! stm32_tim3_monotonic {
+    ($name:ident, $tick_rate_hz:expr) => {
+        $crate::__internal_create_stm32_timer_struct!($name, Tim3Backend, TIM3, $tick_rate_hz);
+    };
 }
 
-/// Register TIM4 interrupt for the monotonic.
+/// Create a TIM4 based monotonic and register the TIM4 interrupt for it.
+///
+/// See [`crate::stm32`] for more details.
+///
+/// # Arguments
+///
+/// * `name` - The name that the monotonic type will have.
+/// * `tick_rate_hz` - The tick rate of the timer peripheral.
+///
 #[cfg(feature = "stm32_tim4")]
 #[macro_export]
-macro_rules! create_stm32_tim4_monotonic_token {
-    () => {{
-        $crate::__internal_create_stm32_timer_interrupt!(Tim4, TIM4, Tim4Token)
-    }};
+macro_rules! stm32_tim4_monotonic {
+    ($name:ident, $tick_rate_hz:expr) => {
+        $crate::__internal_create_stm32_timer_struct!($name, Tim4Backend, TIM4, $tick_rate_hz);
+    };
 }
 
-/// Register TIM5 interrupt for the monotonic.
+/// Create a TIM5 based monotonic and register the TIM5 interrupt for it.
+///
+/// See [`crate::stm32`] for more details.
+///
+/// # Arguments
+///
+/// * `name` - The name that the monotonic type will have.
+/// * `tick_rate_hz` - The tick rate of the timer peripheral.
+///
 #[cfg(feature = "stm32_tim5")]
 #[macro_export]
-macro_rules! create_stm32_tim5_monotonic_token {
-    () => {{
-        $crate::__internal_create_stm32_timer_interrupt!(Tim5, TIM5, Tim5Token)
-    }};
+macro_rules! stm32_tim5_monotonic {
+    ($name:ident, $tick_rate_hz:expr) => {
+        $crate::__internal_create_stm32_timer_struct!($name, Tim5Backend, TIM5, $tick_rate_hz);
+    };
 }
 
-/// Register TIM12 interrupt for the monotonic.
-#[cfg(feature = "stm32_tim12")]
-#[macro_export]
-macro_rules! create_stm32_tim12_monotonic_token {
-    () => {{
-        $crate::__internal_create_stm32_timer_interrupt!(Tim12, TIM12, Tim12Token)
-    }};
-}
-
-/// Register TIM15 interrupt for the monotonic.
+/// Create a TIM15 based monotonic and register the TIM15 interrupt for it.
+///
+/// See [`crate::stm32`] for more details.
+///
+/// # Arguments
+///
+/// * `name` - The name that the monotonic type will have.
+/// * `tick_rate_hz` - The tick rate of the timer peripheral.
+///
 #[cfg(feature = "stm32_tim15")]
 #[macro_export]
-macro_rules! create_stm32_tim15_monotonic_token {
-    () => {{
-        $crate::__internal_create_stm32_timer_interrupt!(Tim15, TIM15, Tim15Token)
-    }};
+macro_rules! stm32_tim15_monotonic {
+    ($name:ident, $tick_rate_hz:expr) => {
+        $crate::__internal_create_stm32_timer_struct!($name, Tim15Backend, TIM15, $tick_rate_hz);
+    };
 }
 
 macro_rules! make_timer {
-    ($mono_name:ident, $timer:ident, $bits:ident, $overflow:ident, $tq:ident$(, doc: ($($doc:tt)*))?) => {
-        /// Monotonic timer queue implementation.
+    ($backend_name:ident, $timer:ident, $bits:ident, $overflow:ident, $tq:ident$(, doc: ($($doc:tt)*))?) => {
+        /// Monotonic timer backend implementation.
         $(
             #[cfg_attr(docsrs, doc(cfg($($doc)*)))]
         )?
 
-        pub struct $mono_name;
+        pub struct $backend_name;
 
         use pac::$timer;
 
         static $overflow: AtomicU64 = AtomicU64::new(0);
-        static $tq: TimerQueue<$mono_name> = TimerQueue::new();
+        static $tq: TimerQueue<$backend_name> = TimerQueue::new();
 
-        impl $mono_name {
-            /// Starts the monotonic timer.
+        impl $backend_name {
+            /// Starts the timer.
             ///
-            /// - `tim_clock_hz`: `TIMx` peripheral clock frequency.
-            /// - `_interrupt_token`: Required for correct timer interrupt handling.
+            /// **Do not use this function directly.**
             ///
-            /// This method must be called only once.
-            pub fn start(tim_clock_hz: u32, _interrupt_token: impl crate::InterruptToken<Self>) {
+            /// Use the prelude macros instead.
+            pub fn _start(tim_clock_hz: u32, timer_hz: u32) {
                 _generated::$timer::enable();
                 _generated::$timer::reset();
 
                 $timer.cr1().modify(|r| r.set_cen(false));
 
-                assert!((tim_clock_hz % TIMER_HZ) == 0, "Unable to find suitable timer prescaler value!");
-                let psc = tim_clock_hz / TIMER_HZ - 1;
+                assert!((tim_clock_hz % timer_hz) == 0, "Unable to find suitable timer prescaler value!");
+                let psc = tim_clock_hz / timer_hz - 1;
                 $timer.psc().write(|r| r.set_psc(psc as u16));
 
                 // Enable full-period interrupt.
                 $timer.dier().modify(|r| r.set_uie(true));
 
                 // Configure and enable half-period interrupt
-                $timer.ccr(2).write(|r| r.set_ccr($bits::MAX - ($bits::MAX >> 1)));
+                $timer.ccr(2).write(|r| r.set_ccr(($bits::MAX - ($bits::MAX >> 1)).into()));
                 $timer.dier().modify(|r| r.set_ccie(2, true));
 
                 // Trigger an update event to load the prescaler value to the clock.
@@ -183,73 +265,31 @@ macro_rules! make_timer {
                     cortex_m::peripheral::NVIC::unmask(pac::Interrupt::$timer);
                 }
             }
-
-            /// Used to access the underlying timer queue
-            #[doc(hidden)]
-            pub fn __tq() -> &'static TimerQueue<$mono_name> {
-                &$tq
-            }
-
-            /// Delay for some duration of time.
-            #[inline]
-            pub async fn delay(duration: <Self as Monotonic>::Duration) {
-                $tq.delay(duration).await;
-            }
-
-            /// Timeout at a specific time.
-            pub async fn timeout_at<F: core::future::Future>(
-                instant: <Self as rtic_time::Monotonic>::Instant,
-                future: F,
-            ) -> Result<F::Output, TimeoutError> {
-                $tq.timeout_at(instant, future).await
-            }
-
-            /// Timeout after a specific duration.
-            #[inline]
-            pub async fn timeout_after<F: core::future::Future>(
-                duration: <Self as Monotonic>::Duration,
-                future: F,
-            ) -> Result<F::Output, TimeoutError> {
-                $tq.timeout_after(duration, future).await
-            }
-
-            /// Delay to some specific time instant.
-            #[inline]
-            pub async fn delay_until(instant: <Self as Monotonic>::Instant) {
-                $tq.delay_until(instant).await;
-            }
         }
 
-        rtic_time::embedded_hal_delay_impl_fugit64!($mono_name);
+        impl TimerQueueBackend for $backend_name {
+            type Ticks = u64;
 
-        #[cfg(feature = "embedded-hal-async")]
-        rtic_time::embedded_hal_async_delay_impl_fugit64!($mono_name);
-
-        impl Monotonic for $mono_name {
-            type Instant = fugit::TimerInstantU64<TIMER_HZ>;
-            type Duration = fugit::TimerDurationU64<TIMER_HZ>;
-
-            const ZERO: Self::Instant = Self::Instant::from_ticks(0);
-            const TICK_PERIOD: Self::Duration = Self::Duration::from_ticks(1);
-
-            fn now() -> Self::Instant {
-                Self::Instant::from_ticks(calculate_now(
+            fn now() -> Self::Ticks {
+                calculate_now(
                     || $overflow.load(Ordering::Relaxed),
                     || $timer.cnt().read().cnt()
-                ))
+                )
             }
 
-            fn set_compare(instant: Self::Instant) {
+            fn set_compare(instant: Self::Ticks) {
                 let now = Self::now();
 
                 // Since the timer may or may not overflow based on the requested compare val, we check how many ticks are left.
-                let val = match instant.checked_duration_since(now) {
-                    None => 0, // In the past
-                    Some(x) if x.ticks() <= ($bits::MAX as u64) => instant.duration_since_epoch().ticks() as $bits, // Will not overflow
-                    Some(_x) => 0, // Will overflow
+                // `wrapping_sup` takes care of the u64 integer overflow special case.
+                let val = if instant.wrapping_sub(now) <= ($bits::MAX as u64) {
+                    instant as $bits
+                } else {
+                    // In the past or will overflow
+                    0
                 };
 
-                $timer.ccr(1).write(|r| r.set_ccr(val));
+                $timer.ccr(1).write(|r| r.set_ccr(val.into()));
             }
 
             fn clear_compare_flag() {
@@ -282,24 +322,25 @@ macro_rules! make_timer {
                     assert!(prev % 2 == 0, "Monotonic must have missed an interrupt!");
                 }
             }
+
+            fn timer_queue() -> &'static TimerQueue<$backend_name> {
+                &$tq
+            }
         }
     };
 }
 
 #[cfg(feature = "stm32_tim2")]
-make_timer!(Tim2, TIM2, u32, TIMER2_OVERFLOWS, TIMER2_TQ);
+make_timer!(Tim2Backend, TIM2, u32, TIMER2_OVERFLOWS, TIMER2_TQ);
 
 #[cfg(feature = "stm32_tim3")]
-make_timer!(Tim3, TIM3, u16, TIMER3_OVERFLOWS, TIMER3_TQ);
+make_timer!(Tim3Backend, TIM3, u16, TIMER3_OVERFLOWS, TIMER3_TQ);
 
 #[cfg(feature = "stm32_tim4")]
-make_timer!(Tim4, TIM4, u16, TIMER4_OVERFLOWS, TIMER4_TQ);
+make_timer!(Tim4Backend, TIM4, u16, TIMER4_OVERFLOWS, TIMER4_TQ);
 
 #[cfg(feature = "stm32_tim5")]
-make_timer!(Tim5, TIM5, u16, TIMER5_OVERFLOWS, TIMER5_TQ);
-
-#[cfg(feature = "stm32_tim12")]
-make_timer!(Tim12, TIM12, u16, TIMER12_OVERFLOWS, TIMER12_TQ);
+make_timer!(Tim5Backend, TIM5, u16, TIMER5_OVERFLOWS, TIMER5_TQ);
 
 #[cfg(feature = "stm32_tim15")]
-make_timer!(Tim15, TIM15, u16, TIMER15_OVERFLOWS, TIMER15_TQ);
+make_timer!(Tim15Backend, TIM15, u16, TIMER15_OVERFLOWS, TIMER15_TQ);

rtic-monotonics/src/systick.rs

@@ -1,93 +1,79 @@
-//! [`Monotonic`] based on Cortex-M SysTick. Note: this implementation is inefficient as it
+//! [`Monotonic`](rtic_time::Monotonic) based on Cortex-M SysTick.
+//! Note: this implementation is inefficient as it
 //! ticks and generates interrupts at a constant rate.
 //!
-//! Currently, the following tick rates are supported:
-//!
-//! | Feature          | Tick rate | Precision |
-//! |:----------------:|----------:|----------:|
-//! | (none / default) |  1 kHz    |      1 ms |
-//! |   systick-100hz  | 100 Hz    |     10 ms |
-//! |   systick-10khz  | 10 kHz    |    0.1 ms |
-
 //! # Example
 //!
 //! ```
-//! use rtic_monotonics::systick::*;
+//! use rtic_monotonics::systick::prelude::*;
+//! systick_monotonic!(Mono, 1_000);
 //!
 //! fn init() {
 //!     # // This is normally provided by the selected PAC
 //!     # let systick = unsafe { core::mem::transmute(()) };
-//!     // Generate the required token
-//!     let systick_token = rtic_monotonics::create_systick_token!();
-//!
+//!     #
 //!     // Start the monotonic
-//!     Systick::start(systick, 12_000_000, systick_token);
+//!     Mono::start(systick, 12_000_000);
 //! }
 //!
 //! async fn usage() {
 //!     loop {
 //!          // Use the monotonic
+//!          let timestamp = Mono::now();
 //!          Systick::delay(100.millis()).await;
 //!     }
 //! }
 //! ```
 
-use super::Monotonic;
-pub use super::{TimeoutError, TimerQueue};
+/// Common definitions and traits for using the systick monotonic
+pub mod prelude {
+    pub use crate::systick_monotonic;
+
+    pub use crate::Monotonic;
+
+    cfg_if::cfg_if! {
+        if #[cfg(feature = "systick-64bit")] {
+            pub use fugit::{self, ExtU64, ExtU64Ceil};
+        } else {
+            pub use fugit::{self, ExtU32, ExtU32Ceil};
+        }
+    }
+}
+
+pub use cortex_m::peripheral::SYST;
+
 use atomic_polyfill::Ordering;
-use core::future::Future;
-use cortex_m::peripheral::SYST;
-pub use fugit;
+use rtic_time::timer_queue::TimerQueue;
+
+use crate::TimerQueueBackend;
+
 cfg_if::cfg_if! {
     if #[cfg(feature = "systick-64bit")] {
-        pub use fugit::{ExtU64, ExtU64Ceil};
         use atomic_polyfill::AtomicU64;
         static SYSTICK_CNT: AtomicU64 = AtomicU64::new(0);
     } else {
-        pub use fugit::{ExtU32, ExtU32Ceil};
         use atomic_polyfill::AtomicU32;
         static SYSTICK_CNT: AtomicU32 = AtomicU32::new(0);
     }
 }
-static SYSTICK_TIMER_QUEUE: TimerQueue<Systick> = TimerQueue::new();
 
-// Features should be additive, here systick-100hz gets picked if both
-// `systick-100hz` and `systick-10khz` are enabled.
+static SYSTICK_TIMER_QUEUE: TimerQueue<SystickBackend> = TimerQueue::new();
 
-cfg_if::cfg_if! {
-    if #[cfg(feature = "systick-100hz")]
-    {
-        const TIMER_HZ: u32 = 100;
-    } else if #[cfg(feature = "systick-10khz")]
-    {
-        const TIMER_HZ: u32 = 10_000;
-    } else {
-        // Default case is 1 kHz
-        const TIMER_HZ: u32 = 1_000;
-    }
-}
+/// Systick based [`TimerQueueBackend`].
+pub struct SystickBackend;
 
-/// Systick implementing [`Monotonic`] which runs at 1 kHz, 100Hz or 10 kHz.
-pub struct Systick;
-
-impl Systick {
-    /// Start a `Monotonic` based on SysTick.
+impl SystickBackend {
+    /// Starts the monotonic timer.
     ///
-    /// The `sysclk` parameter is the speed at which SysTick runs at. This value should come from
-    /// the clock generation function of the used HAL.
+    /// **Do not use this function directly.**
     ///
-    /// Notice that the actual rate of the timer is a best approximation based on the given
-    /// `sysclk` and `TIMER_HZ`.
-    ///
-    /// Note: Give the return value to `TimerQueue::initialize()` to initialize the timer queue.
-    pub fn start(
-        mut systick: cortex_m::peripheral::SYST,
-        sysclk: u32,
-        _interrupt_token: impl crate::InterruptToken<Self>,
-    ) {
-        // + TIMER_HZ / 2 provides round to nearest instead of round to 0.
-        // - 1 as the counter range is inclusive [0, reload]
-        let reload = (sysclk + TIMER_HZ / 2) / TIMER_HZ - 1;
+    /// Use the prelude macros instead.
+    pub fn _start(mut systick: SYST, sysclk: u32, timer_hz: u32) {
+        assert!(
+            (sysclk % timer_hz) == 0,
+            "timer_hz cannot evenly divide sysclk! Please adjust the timer or sysclk frequency."
+        );
+        let reload = sysclk / timer_hz - 1;
 
         assert!(reload <= 0x00ff_ffff);
         assert!(reload > 0);
@@ -98,7 +84,7 @@ impl Systick {
         systick.enable_interrupt();
         systick.enable_counter();
 
-        SYSTICK_TIMER_QUEUE.initialize(Systick {});
+        SYSTICK_TIMER_QUEUE.initialize(SystickBackend {});
     }
 
     fn systick() -> SYST {
@@ -106,67 +92,24 @@ impl Systick {
     }
 }
 
-// Forward timerqueue interface
-impl Systick {
-    /// Used to access the underlying timer queue
-    #[doc(hidden)]
-    pub fn __tq() -> &'static TimerQueue<Systick> {
-        &SYSTICK_TIMER_QUEUE
-    }
-
-    /// Timeout at a specific time.
-    pub async fn timeout_at<F: Future>(
-        instant: <Self as Monotonic>::Instant,
-        future: F,
-    ) -> Result<F::Output, TimeoutError> {
-        SYSTICK_TIMER_QUEUE.timeout_at(instant, future).await
-    }
-
-    /// Timeout after a specific duration.
-    #[inline]
-    pub async fn timeout_after<F: Future>(
-        duration: <Self as Monotonic>::Duration,
-        future: F,
-    ) -> Result<F::Output, TimeoutError> {
-        SYSTICK_TIMER_QUEUE.timeout_after(duration, future).await
-    }
-
-    /// Delay for some duration of time.
-    #[inline]
-    pub async fn delay(duration: <Self as Monotonic>::Duration) {
-        SYSTICK_TIMER_QUEUE.delay(duration).await;
-    }
-
-    /// Delay to some specific time instant.
-    #[inline]
-    pub async fn delay_until(instant: <Self as Monotonic>::Instant) {
-        SYSTICK_TIMER_QUEUE.delay_until(instant).await;
-    }
-}
-
-impl Monotonic for Systick {
+impl TimerQueueBackend for SystickBackend {
     cfg_if::cfg_if! {
         if #[cfg(feature = "systick-64bit")] {
-            type Instant = fugit::TimerInstantU64<TIMER_HZ>;
-            type Duration = fugit::TimerDurationU64<TIMER_HZ>;
+            type Ticks = u64;
         } else {
-            type Instant = fugit::TimerInstantU32<TIMER_HZ>;
-            type Duration = fugit::TimerDurationU32<TIMER_HZ>;
+            type Ticks = u32;
         }
     }
 
-    const ZERO: Self::Instant = Self::Instant::from_ticks(0);
-    const TICK_PERIOD: Self::Duration = Self::Duration::from_ticks(1);
-
-    fn now() -> Self::Instant {
+    fn now() -> Self::Ticks {
         if Self::systick().has_wrapped() {
             SYSTICK_CNT.fetch_add(1, Ordering::AcqRel);
         }
 
-        Self::Instant::from_ticks(SYSTICK_CNT.load(Ordering::Relaxed))
+        SYSTICK_CNT.load(Ordering::Relaxed)
     }
 
-    fn set_compare(_: Self::Instant) {
+    fn set_compare(_: Self::Ticks) {
         // No need to do something here, we get interrupts anyway.
     }
 
@@ -184,39 +127,66 @@ impl Monotonic for Systick {
         }
     }
 
-    fn enable_timer() {}
-
-    fn disable_timer() {}
-}
-
-cfg_if::cfg_if! {
-    if #[cfg(feature = "systick-64bit")] {
-        rtic_time::embedded_hal_delay_impl_fugit64!(Systick);
-
-        #[cfg(feature = "embedded-hal-async")]
-        rtic_time::embedded_hal_async_delay_impl_fugit64!(Systick);
-    } else {
-        rtic_time::embedded_hal_delay_impl_fugit32!(Systick);
-
-        #[cfg(feature = "embedded-hal-async")]
-        rtic_time::embedded_hal_async_delay_impl_fugit32!(Systick);
+    fn timer_queue() -> &'static TimerQueue<Self> {
+        &SYSTICK_TIMER_QUEUE
     }
 }
 
-/// Register the Systick interrupt for the monotonic.
+/// Create a Systick based monotonic and register the Systick interrupt for it.
+///
+/// See [`crate::systick`] for more details.
+///
+/// # Arguments
+///
+/// * `name` - The name that the monotonic type will have.
+/// * `tick_rate_hz` - The tick rate of the timer peripheral.
+///                    Can be omitted; defaults to 1kHz.
 #[macro_export]
-macro_rules! create_systick_token {
-    () => {{
-        #[no_mangle]
-        #[allow(non_snake_case)]
-        unsafe extern "C" fn SysTick() {
-            $crate::systick::Systick::__tq().on_monotonic_interrupt();
+macro_rules! systick_monotonic {
+    ($name:ident) => {
+        $crate::systick_monotonic($name, 1_000);
+    };
+    ($name:ident, $tick_rate_hz:expr) => {
+        /// A `Monotonic` based on SysTick.
+        struct $name;
+
+        impl $name {
+            /// Starts the `Monotonic`.
+            ///
+            /// The `sysclk` parameter is the speed at which SysTick runs at. This value should come from
+            /// the clock generation function of the used HAL.
+            ///
+            /// Panics if it is impossible to achieve the desired monotonic tick rate based
+            /// on the given `sysclk` parameter. If that happens, adjust the desired monotonic tick rate.
+            ///
+            /// This method must be called only once.
+            pub fn start(systick: $crate::systick::SYST, sysclk: u32) {
+                #[no_mangle]
+                #[allow(non_snake_case)]
+                unsafe extern "C" fn SysTick() {
+                    use $crate::TimerQueueBackend;
+                    $crate::systick::SystickBackend::timer_queue().on_monotonic_interrupt();
+                }
+
+                $crate::systick::SystickBackend::_start(systick, sysclk, $tick_rate_hz);
+            }
         }
 
-        pub struct SystickToken;
+        impl $crate::TimerQueueBasedMonotonic for $name {
+            type Backend = $crate::systick::SystickBackend;
+            type Instant = $crate::fugit::Instant<
+                <Self::Backend as $crate::TimerQueueBackend>::Ticks,
+                1,
+                { $tick_rate_hz },
+            >;
+            type Duration = $crate::fugit::Duration<
+                <Self::Backend as $crate::TimerQueueBackend>::Ticks,
+                1,
+                { $tick_rate_hz },
+            >;
+        }
 
-        unsafe impl $crate::InterruptToken<$crate::systick::Systick> for SystickToken {}
-
-        SystickToken
-    }};
+        $crate::rtic_time::impl_embedded_hal_delay_fugit!($name);
+        $crate::rtic_time::impl_embedded_hal_async_delay_fugit!($name);
+    };
 }

rtic-time/CHANGELOG.md

@@ -5,11 +5,18 @@ This project adheres to [Semantic Versioning](http://semver.org/).
 
 For each category, *Added*, *Changed*, *Fixed* add new entries at the top!
 
-## Unreleased
+## Unreleased - v2.0.0
+
 
 ### Added
 
 ### Changed
+- Full rewrite of the `Monotonic` API.
+    - Now split into multiple traits:
+        - `Monotonic` - A user-facing trait that defines what the functionality of a monotonic is.
+        - `TimerQueueBackend` - The set of functionality a backend must provide in order to be used with the `TimerQueue`.
+    - `TimerQueue` is now purely based on ticks and has no concept of real time.
+    - The `TimerQueueBasedMonotonic` trait implements a `Monotonic` based on a `TimerQueueBackend`, translating ticks into `Instant` and `Duration`.
 
 ### Fixed
 

rtic-time/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "rtic-time"
-version = "1.3.0"
+version = "2.0.0"
 
 edition = "2021"
 authors = [
@@ -11,7 +11,7 @@ authors = [
   "Per Lindgren <per.lindgren@ltu.se>",
 ]
 categories = ["concurrency", "embedded", "no-std", "asynchronous"]
-description = "rtic-time lib TODO"
+description = "Basic definitions and utilities that can be used to keep track of time"
 license = "MIT OR Apache-2.0"
 repository = "https://github.com/rtic-rs/rtic"
 
@@ -21,11 +21,11 @@ repository = "https://github.com/rtic-rs/rtic"
 critical-section = "1"
 futures-util = { version = "0.3.25", default-features = false }
 rtic-common = { version = "1.0.0", path = "../rtic-common" }
+embedded-hal = { version = "1.0.0" }
+embedded-hal-async = { version = "1.0.0" }
+fugit = "0.3.7"
 
 [dev-dependencies]
-embedded-hal = { version = "1.0" }
-embedded-hal-async = { version = "1.0" }
-fugit = "0.3.7"
 parking_lot = "0.12"
 cassette = "0.2"
 cooked-waker = "5.0.0"

rtic-time/README.md

@@ -0,0 +1,29 @@
+# rtic-time
+
+Basic definitions and utilities that can be used to keep track of time.
+
+[![crates.io](https://img.shields.io/crates/v/rtic-time)](https://crates.io/crates/rtic-time)
+[![docs.rs](https://docs.rs/rtic-time/badge.svg)](https://docs.rs/rtic-time)
+[![matrix](https://img.shields.io/matrix/rtic:matrix.org)](https://matrix.to/#/#rtic:matrix.org)
+
+
+## Content
+
+The main contribution of this crate is to define the [`Monotonic`](https://docs.rs/rtic-time/latest/rtic_time/trait.Monotonic.html) trait. It serves as a standardized interface for libraries to interact with the system's monotonic timers.
+
+Additionally, this crate provides tools and utilities that help with implementing monotonic timers.
+
+## Implementations of the `Monotonic` trait
+
+For implementations of [`Monotonic`](https://docs.rs/rtic-time/latest/rtic_time/trait.Monotonic.html)
+on various hardware, see [`rtic-monotonics`](https://docs.rs/rtic-monotonics/).
+
+
+## Chat
+
+Join us and talk about RTIC in the [Matrix room][matrix-room].
+
+Weekly meeting minutes can be found over at [RTIC HackMD][hackmd].
+
+[matrix-room]: https://matrix.to/#/#rtic:matrix.org
+[hackmd]: https://rtic.rs/meeting

rtic-time/src/lib.rs

@@ -5,285 +5,60 @@
 
 #![no_std]
 #![deny(missing_docs)]
-#![allow(incomplete_features)]
-
-use core::future::{poll_fn, Future};
-use core::pin::Pin;
-use core::sync::atomic::{AtomicBool, AtomicUsize, Ordering};
-use core::task::{Poll, Waker};
-use futures_util::{
-    future::{select, Either},
-    pin_mut,
-};
-use linked_list::{Link, LinkedList};
-pub use monotonic::Monotonic;
-use rtic_common::dropper::OnDrop;
+#![allow(async_fn_in_trait)]
 
 pub mod half_period_counter;
 mod linked_list;
-mod monotonic;
-
-/// Holds a waker and at which time instant this waker shall be awoken.
-struct WaitingWaker<Mono: Monotonic> {
-    waker: Waker,
-    release_at: Mono::Instant,
-    was_popped: AtomicBool,
-}
-
-impl<Mono: Monotonic> Clone for WaitingWaker<Mono> {
-    fn clone(&self) -> Self {
-        Self {
-            waker: self.waker.clone(),
-            release_at: self.release_at,
-            was_popped: AtomicBool::new(self.was_popped.load(Ordering::Relaxed)),
-        }
-    }
-}
-
-impl<Mono: Monotonic> PartialEq for WaitingWaker<Mono> {
-    fn eq(&self, other: &Self) -> bool {
-        self.release_at == other.release_at
-    }
-}
-
-impl<Mono: Monotonic> PartialOrd for WaitingWaker<Mono> {
-    fn partial_cmp(&self, other: &Self) -> Option<core::cmp::Ordering> {
-        self.release_at.partial_cmp(&other.release_at)
-    }
-}
-
-/// A generic timer queue for async executors.
-///
-/// # Blocking
-///
-/// The internal priority queue uses global critical sections to manage access. This means that
-/// `await`ing a delay will cause a lock of the entire system for O(n) time. In practice the lock
-/// duration is ~10 clock cycles per element in the queue.
-///
-/// # Safety
-///
-/// This timer queue is based on an intrusive linked list, and by extension the links are strored
-/// on the async stacks of callers. The links are deallocated on `drop` or when the wait is
-/// complete.
-///
-/// Do not call `mem::forget` on an awaited future, or there will be dragons!
-pub struct TimerQueue<Mono: Monotonic> {
-    queue: LinkedList<WaitingWaker<Mono>>,
-    initialized: AtomicBool,
-}
+pub mod monotonic;
+pub mod timer_queue;
 
 /// This indicates that there was a timeout.
 pub struct TimeoutError;
 
-/// This is needed to make the async closure in `delay_until` accept that we "share"
-/// the link possible between threads.
-struct LinkPtr<Mono: Monotonic>(*mut Option<linked_list::Link<WaitingWaker<Mono>>>);
+/// Re-export for macros
+pub use embedded_hal;
+/// Re-export for macros
+pub use embedded_hal_async;
 
-impl<Mono: Monotonic> Clone for LinkPtr<Mono> {
-    fn clone(&self) -> Self {
-        LinkPtr(self.0)
-    }
-}
-
-impl<Mono: Monotonic> LinkPtr<Mono> {
-    /// This will dereference the pointer stored within and give out an `&mut`.
-    unsafe fn get(&mut self) -> &mut Option<linked_list::Link<WaitingWaker<Mono>>> {
-        &mut *self.0
-    }
-}
-
-unsafe impl<Mono: Monotonic> Send for LinkPtr<Mono> {}
-unsafe impl<Mono: Monotonic> Sync for LinkPtr<Mono> {}
-
-impl<Mono: Monotonic> TimerQueue<Mono> {
-    /// Make a new queue.
-    pub const fn new() -> Self {
-        Self {
-            queue: LinkedList::new(),
-            initialized: AtomicBool::new(false),
-        }
-    }
-
-    /// Forwards the `Monotonic::now()` method.
-    #[inline(always)]
-    pub fn now(&self) -> Mono::Instant {
-        Mono::now()
-    }
-
-    /// Takes the initialized monotonic to initialize the TimerQueue.
-    pub fn initialize(&self, monotonic: Mono) {
-        self.initialized.store(true, Ordering::SeqCst);
-
-        // Don't run drop on `Mono`
-        core::mem::forget(monotonic);
-    }
-
-    /// Call this in the interrupt handler of the hardware timer supporting the `Monotonic`
+/// # A monotonic clock / counter definition.
+///
+/// ## Correctness
+///
+/// The trait enforces that proper time-math is implemented between `Instant` and `Duration`. This
+/// is a requirement on the time library that the user chooses to use.
+pub trait Monotonic {
+    /// The type for instant, defining an instant in time.
     ///
-    /// # Safety
+    /// **Note:** In all APIs in RTIC that use instants from this monotonic, this type will be used.
+    type Instant: Ord
+        + Copy
+        + core::ops::Add<Self::Duration, Output = Self::Instant>
+        + core::ops::Sub<Self::Duration, Output = Self::Instant>
+        + core::ops::Sub<Self::Instant, Output = Self::Duration>;
+
+    /// The type for duration, defining a duration of time.
     ///
-    /// It's always safe to call, but it must only be called from the interrupt of the
-    /// monotonic timer for correct operation.
-    pub unsafe fn on_monotonic_interrupt(&self) {
-        Mono::clear_compare_flag();
-        Mono::on_interrupt();
+    /// **Note:** In all APIs in RTIC that use duration from this monotonic, this type will be used.
+    type Duration: Copy;
 
-        loop {
-            let mut release_at = None;
-            let head = self.queue.pop_if(|head| {
-                release_at = Some(head.release_at);
+    /// Get the current time.
+    fn now() -> Self::Instant;
 
-                let should_pop = Mono::now() >= head.release_at;
-                head.was_popped.store(should_pop, Ordering::Relaxed);
-
-                should_pop
-            });
-
-            match (head, release_at) {
-                (Some(link), _) => {
-                    link.waker.wake();
-                }
-                (None, Some(instant)) => {
-                    Mono::enable_timer();
-                    Mono::set_compare(instant);
-
-                    if Mono::now() >= instant {
-                        // The time for the next instant passed while handling it,
-                        // continue dequeueing
-                        continue;
-                    }
-
-                    break;
-                }
-                (None, None) => {
-                    // Queue is empty
-                    Mono::disable_timer();
-
-                    break;
-                }
-            }
-        }
-    }
-
-    /// Timeout at a specific time.
-    pub async fn timeout_at<F: Future>(
-        &self,
-        instant: Mono::Instant,
-        future: F,
-    ) -> Result<F::Output, TimeoutError> {
-        let delay = self.delay_until(instant);
-
-        pin_mut!(future);
-        pin_mut!(delay);
-
-        match select(future, delay).await {
-            Either::Left((r, _)) => Ok(r),
-            Either::Right(_) => Err(TimeoutError),
-        }
-    }
-
-    /// Timeout after at least a specific duration.
-    #[inline]
-    pub async fn timeout_after<F: Future>(
-        &self,
-        duration: Mono::Duration,
-        future: F,
-    ) -> Result<F::Output, TimeoutError> {
-        let now = Mono::now();
-        let mut timeout = now + duration;
-        if now != timeout {
-            timeout = timeout + Mono::TICK_PERIOD;
-        }
-
-        // Wait for one period longer, because by definition timers have an uncertainty
-        // of one period, so waiting for 'at least' needs to compensate for that.
-        self.timeout_at(timeout, future).await
-    }
-
-    /// Delay for at least some duration of time.
-    #[inline]
-    pub async fn delay(&self, duration: Mono::Duration) {
-        let now = Mono::now();
-        let mut timeout = now + duration;
-        if now != timeout {
-            timeout = timeout + Mono::TICK_PERIOD;
-        }
-
-        // Wait for one period longer, because by definition timers have an uncertainty
-        // of one period, so waiting for 'at least' needs to compensate for that.
-        self.delay_until(timeout).await;
-    }
+    /// Delay for some duration of time.
+    async fn delay(duration: Self::Duration);
 
     /// Delay to some specific time instant.
-    pub async fn delay_until(&self, instant: Mono::Instant) {
-        if !self.initialized.load(Ordering::Relaxed) {
-            panic!(
-                "The timer queue is not initialized with a monotonic, you need to run `initialize`"
-            );
-        }
+    async fn delay_until(instant: Self::Instant);
 
-        let mut link_ptr: Option<linked_list::Link<WaitingWaker<Mono>>> = None;
+    /// Timeout at a specific time.
+    async fn timeout_at<F: core::future::Future>(
+        instant: Self::Instant,
+        future: F,
+    ) -> Result<F::Output, TimeoutError>;
 
-        // Make this future `Drop`-safe
-        // SAFETY(link_ptr): Shadow the original definition of `link_ptr` so we can't abuse it.
-        let mut link_ptr =
-            LinkPtr(&mut link_ptr as *mut Option<linked_list::Link<WaitingWaker<Mono>>>);
-        let mut link_ptr2 = link_ptr.clone();
-
-        let queue = &self.queue;
-        let marker = &AtomicUsize::new(0);
-
-        let dropper = OnDrop::new(|| {
-            queue.delete(marker.load(Ordering::Relaxed));
-        });
-
-        poll_fn(|cx| {
-            if Mono::now() >= instant {
-                return Poll::Ready(());
-            }
-
-            // SAFETY: This pointer is only dereferenced here and on drop of the future
-            // which happens outside this `poll_fn`'s stack frame, so this mutable access cannot
-            // happen at the same time as `dropper` runs.
-            let link = unsafe { link_ptr2.get() };
-            if link.is_none() {
-                let link_ref = link.insert(Link::new(WaitingWaker {
-                    waker: cx.waker().clone(),
-                    release_at: instant,
-                    was_popped: AtomicBool::new(false),
-                }));
-
-                // SAFETY(new_unchecked): The address to the link is stable as it is defined
-                //outside this stack frame.
-                // SAFETY(insert): `link_ref` lifetime comes from `link_ptr` that is shadowed, and
-                // we make sure in `dropper` that the link is removed from the queue before
-                // dropping `link_ptr` AND `dropper` makes sure that the shadowed `link_ptr` lives
-                // until the end of the stack frame.
-                let (head_updated, addr) = unsafe { queue.insert(Pin::new_unchecked(link_ref)) };
-
-                marker.store(addr, Ordering::Relaxed);
-
-                if head_updated {
-                    // Pend the monotonic handler if the queue head was updated.
-                    Mono::pend_interrupt()
-                }
-            }
-
-            Poll::Pending
-        })
-        .await;
-
-        // SAFETY: We only run this and dereference the pointer if we have
-        // exited the `poll_fn` below in the `drop(dropper)` call. The other dereference
-        // of this pointer is in the `poll_fn`.
-        if let Some(link) = unsafe { link_ptr.get() } {
-            if link.val.was_popped.load(Ordering::Relaxed) {
-                // If it was popped from the queue there is no need to run delete
-                dropper.defuse();
-            }
-        } else {
-            // Make sure that our link is deleted from the list before we drop this stack
-            drop(dropper);
-        }
-    }
+    /// Timeout after a specific duration.
+    async fn timeout_after<F: core::future::Future>(
+        duration: Self::Duration,
+        future: F,
+    ) -> Result<F::Output, TimeoutError>;
 }

rtic-time/src/monotonic.rs

@@ -1,236 +1,8 @@
-//! A monotonic clock / counter definition.
+//! Structs and traits surrounding the [`Monotonic`](crate::Monotonic) trait.
 
-/// # A monotonic clock / counter definition.
-///
-/// ## Correctness
-///
-/// The trait enforces that proper time-math is implemented between `Instant` and `Duration`. This
-/// is a requirement on the time library that the user chooses to use.
-pub trait Monotonic {
-    /// The time at time zero.
-    const ZERO: Self::Instant;
+pub use timer_queue_based_monotonic::{
+    TimerQueueBasedDuration, TimerQueueBasedInstant, TimerQueueBasedMonotonic,
+};
 
-    /// The duration between two timer ticks.
-    const TICK_PERIOD: Self::Duration;
-
-    /// The type for instant, defining an instant in time.
-    ///
-    /// **Note:** In all APIs in RTIC that use instants from this monotonic, this type will be used.
-    type Instant: Ord
-        + Copy
-        + core::ops::Add<Self::Duration, Output = Self::Instant>
-        + core::ops::Sub<Self::Duration, Output = Self::Instant>
-        + core::ops::Sub<Self::Instant, Output = Self::Duration>;
-
-    /// The type for duration, defining an duration of time.
-    ///
-    /// **Note:** In all APIs in RTIC that use duration from this monotonic, this type will be used.
-    type Duration;
-
-    /// Get the current time.
-    fn now() -> Self::Instant;
-
-    /// Set the compare value of the timer interrupt.
-    ///
-    /// **Note:** This method does not need to handle race conditions of the monotonic, the timer
-    /// queue in RTIC checks this.
-    fn set_compare(instant: Self::Instant);
-
-    /// This method used to be required by an errata workaround
-    /// for the nrf52 family, but it has been disabled as the
-    /// workaround was erroneous.
-    #[deprecated(
-        since = "1.2.0",
-        note = "this method is erroneous and has been disabled"
-    )]
-    fn should_dequeue_check(_: Self::Instant) -> bool {
-        panic!("This method should not be used as it is erroneous.")
-    }
-
-    /// Clear the compare interrupt flag.
-    fn clear_compare_flag();
-
-    /// Pend the timer's interrupt.
-    fn pend_interrupt();
-
-    /// Optional. Runs on interrupt before any timer queue handling.
-    fn on_interrupt() {}
-
-    /// Optional. This is used to save power, this is called when the timer queue is not empty.
-    ///
-    /// Enabling and disabling the monotonic needs to propagate to `now` so that an instant
-    /// based of `now()` is still valid.
-    ///
-    /// NOTE: This may be called more than once.
-    fn enable_timer() {}
-
-    /// Optional. This is used to save power, this is called when the timer queue is empty.
-    ///
-    /// Enabling and disabling the monotonic needs to propagate to `now` so that an instant
-    /// based of `now()` is still valid.
-    ///
-    /// NOTE: This may be called more than once.
-    fn disable_timer() {}
-}
-
-/// Creates impl blocks for [`embedded_hal::delay::DelayNs`][DelayNs],
-/// based on [`fugit::ExtU64Ceil`][ExtU64Ceil].
-///
-/// [DelayNs]: https://docs.rs/embedded-hal/latest/embedded_hal/delay/trait.DelayNs.html
-/// [ExtU64Ceil]: https://docs.rs/fugit/latest/fugit/trait.ExtU64Ceil.html
-#[macro_export]
-macro_rules! embedded_hal_delay_impl_fugit64 {
-    ($t:ty) => {
-        impl ::embedded_hal::delay::DelayNs for $t {
-            fn delay_ns(&mut self, ns: u32) {
-                use ::fugit::ExtU64Ceil;
-
-                let now = Self::now();
-                let mut done = now + u64::from(ns).nanos_at_least();
-                if now != done {
-                    // Compensate for sub-tick uncertainty
-                    done += Self::TICK_PERIOD;
-                }
-
-                while Self::now() < done {}
-            }
-
-            fn delay_us(&mut self, us: u32) {
-                use ::fugit::ExtU64Ceil;
-
-                let now = Self::now();
-                let mut done = now + u64::from(us).micros_at_least();
-                if now != done {
-                    // Compensate for sub-tick uncertainty
-                    done += Self::TICK_PERIOD;
-                }
-
-                while Self::now() < done {}
-            }
-
-            fn delay_ms(&mut self, ms: u32) {
-                use ::fugit::ExtU64Ceil;
-
-                let now = Self::now();
-                let mut done = now + u64::from(ms).millis_at_least();
-                if now != done {
-                    // Compensate for sub-tick uncertainty
-                    done += Self::TICK_PERIOD;
-                }
-
-                while Self::now() < done {}
-            }
-        }
-    };
-}
-
-/// Creates impl blocks for [`embedded_hal_async::delay::DelayNs`][DelayNs],
-/// based on [`fugit::ExtU64Ceil`][ExtU64Ceil].
-///
-/// [DelayNs]: https://docs.rs/embedded-hal-async/latest/embedded_hal_async/delay/trait.DelayNs.html
-/// [ExtU64Ceil]: https://docs.rs/fugit/latest/fugit/trait.ExtU64Ceil.html
-#[macro_export]
-macro_rules! embedded_hal_async_delay_impl_fugit64 {
-    ($t:ty) => {
-        impl ::embedded_hal_async::delay::DelayNs for $t {
-            #[inline]
-            async fn delay_ns(&mut self, ns: u32) {
-                use ::fugit::ExtU64Ceil;
-                Self::delay(u64::from(ns).nanos_at_least()).await;
-            }
-
-            #[inline]
-            async fn delay_us(&mut self, us: u32) {
-                use ::fugit::ExtU64Ceil;
-                Self::delay(u64::from(us).micros_at_least()).await;
-            }
-
-            #[inline]
-            async fn delay_ms(&mut self, ms: u32) {
-                use ::fugit::ExtU64Ceil;
-                Self::delay(u64::from(ms).millis_at_least()).await;
-            }
-        }
-    };
-}
-
-/// Creates impl blocks for [`embedded_hal::delay::DelayNs`][DelayNs],
-/// based on [`fugit::ExtU32Ceil`][ExtU32Ceil].
-///
-/// [DelayNs]: https://docs.rs/embedded-hal/latest/embedded_hal/delay/trait.DelayNs.html
-/// [ExtU32Ceil]: https://docs.rs/fugit/latest/fugit/trait.ExtU32Ceil.html
-#[macro_export]
-macro_rules! embedded_hal_delay_impl_fugit32 {
-    ($t:ty) => {
-        impl ::embedded_hal::delay::DelayNs for $t {
-            fn delay_ns(&mut self, ns: u32) {
-                use ::fugit::ExtU32Ceil;
-
-                let now = Self::now();
-                let mut done = now + ns.nanos_at_least();
-                if now != done {
-                    // Compensate for sub-tick uncertainty
-                    done += Self::TICK_PERIOD;
-                }
-
-                while Self::now() < done {}
-            }
-
-            fn delay_us(&mut self, us: u32) {
-                use ::fugit::ExtU32Ceil;
-
-                let now = Self::now();
-                let mut done = now + us.micros_at_least();
-                if now != done {
-                    // Compensate for sub-tick uncertainty
-                    done += Self::TICK_PERIOD;
-                }
-
-                while Self::now() < done {}
-            }
-
-            fn delay_ms(&mut self, ms: u32) {
-                use ::fugit::ExtU32Ceil;
-
-                let now = Self::now();
-                let mut done = now + ms.millis_at_least();
-                if now != done {
-                    // Compensate for sub-tick uncertainty
-                    done += Self::TICK_PERIOD;
-                }
-
-                while Self::now() < done {}
-            }
-        }
-    };
-}
-
-/// Creates impl blocks for [`embedded_hal_async::delay::DelayNs`][DelayNs],
-/// based on [`fugit::ExtU32Ceil`][ExtU32Ceil].
-///
-/// [DelayNs]: https://docs.rs/embedded-hal-async/latest/embedded_hal_async/delay/trait.DelayNs.html
-/// [ExtU32Ceil]: https://docs.rs/fugit/latest/fugit/trait.ExtU32Ceil.html
-#[macro_export]
-macro_rules! embedded_hal_async_delay_impl_fugit32 {
-    ($t:ty) => {
-        impl ::embedded_hal_async::delay::DelayNs for $t {
-            #[inline]
-            async fn delay_ns(&mut self, ns: u32) {
-                use ::fugit::ExtU32Ceil;
-                Self::delay(ns.nanos_at_least()).await;
-            }
-
-            #[inline]
-            async fn delay_us(&mut self, us: u32) {
-                use ::fugit::ExtU32Ceil;
-                Self::delay(us.micros_at_least()).await;
-            }
-
-            #[inline]
-            async fn delay_ms(&mut self, ms: u32) {
-                use ::fugit::ExtU32Ceil;
-                Self::delay(ms.millis_at_least()).await;
-            }
-        }
-    };
-}
+mod embedded_hal_macros;
+mod timer_queue_based_monotonic;

rtic-time/src/monotonic/embedded_hal_macros.rs

@@ -0,0 +1,77 @@
+//! Macros that implement embedded-hal traits for Monotonics
+
+/// Implements [`embedded_hal::delay::DelayNs`] for a given monotonic.
+#[macro_export]
+macro_rules! impl_embedded_hal_delay_fugit {
+    ($t:ty) => {
+        impl $crate::embedded_hal::delay::DelayNs for $t {
+            fn delay_ns(&mut self, ns: u32) {
+                let now = <Self as $crate::Monotonic>::now();
+                let mut done =
+                    now + <Self as $crate::Monotonic>::Duration::nanos_at_least(ns.into());
+                if now != done {
+                    // Compensate for sub-tick uncertainty
+                    done = done + <Self as $crate::Monotonic>::Duration::from_ticks(1);
+                }
+
+                while <Self as $crate::Monotonic>::now() < done {}
+            }
+
+            fn delay_us(&mut self, us: u32) {
+                let now = <Self as $crate::Monotonic>::now();
+                let mut done =
+                    now + <Self as $crate::Monotonic>::Duration::micros_at_least(us.into());
+                if now != done {
+                    // Compensate for sub-tick uncertainty
+                    done = done + <Self as $crate::Monotonic>::Duration::from_ticks(1);
+                }
+
+                while <Self as $crate::Monotonic>::now() < done {}
+            }
+
+            fn delay_ms(&mut self, ms: u32) {
+                let now = <Self as $crate::Monotonic>::now();
+                let mut done =
+                    now + <Self as $crate::Monotonic>::Duration::millis_at_least(ms.into());
+                if now != done {
+                    // Compensate for sub-tick uncertainty
+                    done = done + <Self as $crate::Monotonic>::Duration::from_ticks(1);
+                }
+
+                while <Self as $crate::Monotonic>::now() < done {}
+            }
+        }
+    };
+}
+
+/// Implements [`embedded_hal_async::delay::DelayNs`] for a given monotonic.
+#[macro_export]
+macro_rules! impl_embedded_hal_async_delay_fugit {
+    ($t:ty) => {
+        impl $crate::embedded_hal_async::delay::DelayNs for $t {
+            #[inline]
+            async fn delay_ns(&mut self, ns: u32) {
+                <Self as $crate::Monotonic>::delay(
+                    <Self as $crate::Monotonic>::Duration::nanos_at_least(ns.into()),
+                )
+                .await;
+            }
+
+            #[inline]
+            async fn delay_us(&mut self, us: u32) {
+                <Self as $crate::Monotonic>::delay(
+                    <Self as $crate::Monotonic>::Duration::micros_at_least(us.into()),
+                )
+                .await;
+            }
+
+            #[inline]
+            async fn delay_ms(&mut self, ms: u32) {
+                <Self as $crate::Monotonic>::delay(
+                    <Self as $crate::Monotonic>::Duration::millis_at_least(ms.into()),
+                )
+                .await;
+            }
+        }
+    };
+}

rtic-time/src/monotonic/timer_queue_based_monotonic.rs

@@ -0,0 +1,113 @@
+use crate::{timer_queue::TimerQueueBackend, TimeoutError};
+
+use crate::Monotonic;
+
+/// A [`Monotonic`] that is backed by the [`TimerQueue`](crate::timer_queue::TimerQueue).
+pub trait TimerQueueBasedMonotonic {
+    /// The backend for the timer queue
+    type Backend: TimerQueueBackend;
+
+    /// The type for instant, defining an instant in time.
+    ///
+    /// **Note:** In all APIs in RTIC that use instants from this monotonic, this type will be used.
+    type Instant: TimerQueueBasedInstant<Ticks = <Self::Backend as TimerQueueBackend>::Ticks>
+        + core::ops::Add<Self::Duration, Output = Self::Instant>
+        + core::ops::Sub<Self::Duration, Output = Self::Instant>
+        + core::ops::Sub<Self::Instant, Output = Self::Duration>;
+
+    /// The type for duration, defining a duration of time.
+    ///
+    /// **Note:** In all APIs in RTIC that use duration from this monotonic, this type will be used.
+    type Duration: TimerQueueBasedDuration<Ticks = <Self::Backend as TimerQueueBackend>::Ticks>;
+}
+
+impl<T: TimerQueueBasedMonotonic> Monotonic for T {
+    type Instant = T::Instant;
+    type Duration = T::Duration;
+
+    fn now() -> Self::Instant {
+        Self::Instant::from_ticks(T::Backend::timer_queue().now())
+    }
+
+    async fn delay(duration: Self::Duration) {
+        T::Backend::timer_queue().delay(duration.ticks()).await
+    }
+
+    async fn delay_until(instant: Self::Instant) {
+        T::Backend::timer_queue().delay_until(instant.ticks()).await
+    }
+
+    async fn timeout_at<F: core::future::Future>(
+        instant: Self::Instant,
+        future: F,
+    ) -> Result<F::Output, TimeoutError> {
+        T::Backend::timer_queue()
+            .timeout_at(instant.ticks(), future)
+            .await
+    }
+
+    async fn timeout_after<F: core::future::Future>(
+        duration: Self::Duration,
+        future: F,
+    ) -> Result<F::Output, TimeoutError> {
+        T::Backend::timer_queue()
+            .timeout_after(duration.ticks(), future)
+            .await
+    }
+}
+
+/// An instant that can be used in [`TimerQueueBasedMonotonic`].
+pub trait TimerQueueBasedInstant: Ord + Copy {
+    /// The internal type of the instant
+    type Ticks;
+    /// Convert from ticks to the instant
+    fn from_ticks(ticks: Self::Ticks) -> Self;
+    /// Convert the instant to ticks
+    fn ticks(self) -> Self::Ticks;
+}
+
+/// A duration that can be used in [`TimerQueueBasedMonotonic`].
+pub trait TimerQueueBasedDuration: Copy {
+    /// The internal type of the duration
+    type Ticks;
+    /// Convert the duration to ticks
+    fn ticks(self) -> Self::Ticks;
+}
+
+impl<const NOM: u32, const DENOM: u32> TimerQueueBasedInstant for fugit::Instant<u64, NOM, DENOM> {
+    type Ticks = u64;
+    fn from_ticks(ticks: Self::Ticks) -> Self {
+        Self::from_ticks(ticks)
+    }
+    fn ticks(self) -> Self::Ticks {
+        Self::ticks(&self)
+    }
+}
+
+impl<const NOM: u32, const DENOM: u32> TimerQueueBasedInstant for fugit::Instant<u32, NOM, DENOM> {
+    type Ticks = u32;
+    fn from_ticks(ticks: Self::Ticks) -> Self {
+        Self::from_ticks(ticks)
+    }
+    fn ticks(self) -> Self::Ticks {
+        Self::ticks(&self)
+    }
+}
+
+impl<const NOM: u32, const DENOM: u32> TimerQueueBasedDuration
+    for fugit::Duration<u64, NOM, DENOM>
+{
+    type Ticks = u64;
+    fn ticks(self) -> Self::Ticks {
+        Self::ticks(&self)
+    }
+}
+
+impl<const NOM: u32, const DENOM: u32> TimerQueueBasedDuration
+    for fugit::Duration<u32, NOM, DENOM>
+{
+    type Ticks = u32;
+    fn ticks(self) -> Self::Ticks {
+        Self::ticks(&self)
+    }
+}

rtic-time/src/timer_queue.rs

@@ -0,0 +1,281 @@
+//! A generic timer queue for async executors.
+
+use crate::linked_list::{self, Link, LinkedList};
+use crate::TimeoutError;
+
+use core::future::{poll_fn, Future};
+use core::pin::Pin;
+use core::sync::atomic::{AtomicBool, AtomicUsize, Ordering};
+use core::task::{Poll, Waker};
+use futures_util::{
+    future::{select, Either},
+    pin_mut,
+};
+use rtic_common::dropper::OnDrop;
+
+mod backend;
+mod tick_type;
+pub use backend::TimerQueueBackend;
+pub use tick_type::TimerQueueTicks;
+
+/// Holds a waker and at which time instant this waker shall be awoken.
+struct WaitingWaker<Backend: TimerQueueBackend> {
+    waker: Waker,
+    release_at: Backend::Ticks,
+    was_popped: AtomicBool,
+}
+
+impl<Backend: TimerQueueBackend> Clone for WaitingWaker<Backend> {
+    fn clone(&self) -> Self {
+        Self {
+            waker: self.waker.clone(),
+            release_at: self.release_at,
+            was_popped: AtomicBool::new(self.was_popped.load(Ordering::Relaxed)),
+        }
+    }
+}
+
+impl<Backend: TimerQueueBackend> PartialEq for WaitingWaker<Backend> {
+    fn eq(&self, other: &Self) -> bool {
+        self.release_at == other.release_at
+    }
+}
+
+impl<Backend: TimerQueueBackend> PartialOrd for WaitingWaker<Backend> {
+    fn partial_cmp(&self, other: &Self) -> Option<core::cmp::Ordering> {
+        Some(self.release_at.compare(other.release_at))
+    }
+}
+
+/// A generic timer queue for async executors.
+///
+/// # Blocking
+///
+/// The internal priority queue uses global critical sections to manage access. This means that
+/// `await`ing a delay will cause a lock of the entire system for O(n) time. In practice the lock
+/// duration is ~10 clock cycles per element in the queue.
+///
+/// # Safety
+///
+/// This timer queue is based on an intrusive linked list, and by extension the links are stored
+/// on the async stacks of callers. The links are deallocated on `drop` or when the wait is
+/// complete.
+///
+/// Do not call `mem::forget` on an awaited future, or there will be dragons!
+pub struct TimerQueue<Backend: TimerQueueBackend> {
+    queue: LinkedList<WaitingWaker<Backend>>,
+    initialized: AtomicBool,
+}
+
+/// This is needed to make the async closure in `delay_until` accept that we "share"
+/// the link possible between threads.
+struct LinkPtr<Backend: TimerQueueBackend>(*mut Option<linked_list::Link<WaitingWaker<Backend>>>);
+
+impl<Backend: TimerQueueBackend> Clone for LinkPtr<Backend> {
+    fn clone(&self) -> Self {
+        LinkPtr(self.0)
+    }
+}
+
+impl<Backend: TimerQueueBackend> LinkPtr<Backend> {
+    /// This will dereference the pointer stored within and give out an `&mut`.
+    unsafe fn get(&mut self) -> &mut Option<linked_list::Link<WaitingWaker<Backend>>> {
+        &mut *self.0
+    }
+}
+
+unsafe impl<Backend: TimerQueueBackend> Send for LinkPtr<Backend> {}
+unsafe impl<Backend: TimerQueueBackend> Sync for LinkPtr<Backend> {}
+
+impl<Backend: TimerQueueBackend> TimerQueue<Backend> {
+    /// Make a new queue.
+    pub const fn new() -> Self {
+        Self {
+            queue: LinkedList::new(),
+            initialized: AtomicBool::new(false),
+        }
+    }
+
+    /// Forwards the `Monotonic::now()` method.
+    #[inline(always)]
+    pub fn now(&self) -> Backend::Ticks {
+        Backend::now()
+    }
+
+    /// Takes the initialized monotonic to initialize the TimerQueue.
+    pub fn initialize(&self, backend: Backend) {
+        self.initialized.store(true, Ordering::SeqCst);
+
+        // Don't run drop on `Mono`
+        core::mem::forget(backend);
+    }
+
+    /// Call this in the interrupt handler of the hardware timer supporting the `Monotonic`
+    ///
+    /// # Safety
+    ///
+    /// It's always safe to call, but it must only be called from the interrupt of the
+    /// monotonic timer for correct operation.
+    pub unsafe fn on_monotonic_interrupt(&self) {
+        Backend::clear_compare_flag();
+        Backend::on_interrupt();
+
+        loop {
+            let mut release_at = None;
+            let head = self.queue.pop_if(|head| {
+                release_at = Some(head.release_at);
+
+                let should_pop = Backend::now().is_at_least(head.release_at);
+                head.was_popped.store(should_pop, Ordering::Relaxed);
+
+                should_pop
+            });
+
+            match (head, release_at) {
+                (Some(link), _) => {
+                    link.waker.wake();
+                }
+                (None, Some(instant)) => {
+                    Backend::enable_timer();
+                    Backend::set_compare(instant);
+
+                    if Backend::now().is_at_least(instant) {
+                        // The time for the next instant passed while handling it,
+                        // continue dequeueing
+                        continue;
+                    }
+
+                    break;
+                }
+                (None, None) => {
+                    // Queue is empty
+                    Backend::disable_timer();
+
+                    break;
+                }
+            }
+        }
+    }
+
+    /// Timeout at a specific time.
+    pub async fn timeout_at<F: Future>(
+        &self,
+        instant: Backend::Ticks,
+        future: F,
+    ) -> Result<F::Output, TimeoutError> {
+        let delay = self.delay_until(instant);
+
+        pin_mut!(future);
+        pin_mut!(delay);
+
+        match select(future, delay).await {
+            Either::Left((r, _)) => Ok(r),
+            Either::Right(_) => Err(TimeoutError),
+        }
+    }
+
+    /// Timeout after at least a specific duration.
+    #[inline]
+    pub async fn timeout_after<F: Future>(
+        &self,
+        duration: Backend::Ticks,
+        future: F,
+    ) -> Result<F::Output, TimeoutError> {
+        let now = Backend::now();
+        let mut timeout = now.wrapping_add(duration);
+        if now != timeout {
+            timeout = timeout.wrapping_add(Backend::Ticks::ONE_TICK);
+        }
+
+        // Wait for one period longer, because by definition timers have an uncertainty
+        // of one period, so waiting for 'at least' needs to compensate for that.
+        self.timeout_at(timeout, future).await
+    }
+
+    /// Delay for at least some duration of time.
+    #[inline]
+    pub async fn delay(&self, duration: Backend::Ticks) {
+        let now = Backend::now();
+        let mut timeout = now.wrapping_add(duration);
+        if now != timeout {
+            timeout = timeout.wrapping_add(Backend::Ticks::ONE_TICK);
+        }
+
+        // Wait for one period longer, because by definition timers have an uncertainty
+        // of one period, so waiting for 'at least' needs to compensate for that.
+        self.delay_until(timeout).await;
+    }
+
+    /// Delay to some specific time instant.
+    pub async fn delay_until(&self, instant: Backend::Ticks) {
+        if !self.initialized.load(Ordering::Relaxed) {
+            panic!(
+                "The timer queue is not initialized with a monotonic, you need to run `initialize`"
+            );
+        }
+
+        let mut link_ptr: Option<linked_list::Link<WaitingWaker<Backend>>> = None;
+
+        // Make this future `Drop`-safe
+        // SAFETY(link_ptr): Shadow the original definition of `link_ptr` so we can't abuse it.
+        let mut link_ptr =
+            LinkPtr(&mut link_ptr as *mut Option<linked_list::Link<WaitingWaker<Backend>>>);
+        let mut link_ptr2 = link_ptr.clone();
+
+        let queue = &self.queue;
+        let marker = &AtomicUsize::new(0);
+
+        let dropper = OnDrop::new(|| {
+            queue.delete(marker.load(Ordering::Relaxed));
+        });
+
+        poll_fn(|cx| {
+            if Backend::now().is_at_least(instant) {
+                return Poll::Ready(());
+            }
+
+            // SAFETY: This pointer is only dereferenced here and on drop of the future
+            // which happens outside this `poll_fn`'s stack frame, so this mutable access cannot
+            // happen at the same time as `dropper` runs.
+            let link = unsafe { link_ptr2.get() };
+            if link.is_none() {
+                let link_ref = link.insert(Link::new(WaitingWaker {
+                    waker: cx.waker().clone(),
+                    release_at: instant,
+                    was_popped: AtomicBool::new(false),
+                }));
+
+                // SAFETY(new_unchecked): The address to the link is stable as it is defined
+                //outside this stack frame.
+                // SAFETY(insert): `link_ref` lifetime comes from `link_ptr` that is shadowed, and
+                // we make sure in `dropper` that the link is removed from the queue before
+                // dropping `link_ptr` AND `dropper` makes sure that the shadowed `link_ptr` lives
+                // until the end of the stack frame.
+                let (head_updated, addr) = unsafe { queue.insert(Pin::new_unchecked(link_ref)) };
+
+                marker.store(addr, Ordering::Relaxed);
+
+                if head_updated {
+                    // Pend the monotonic handler if the queue head was updated.
+                    Backend::pend_interrupt()
+                }
+            }
+
+            Poll::Pending
+        })
+        .await;
+
+        // SAFETY: We only run this and dereference the pointer if we have
+        // exited the `poll_fn` below in the `drop(dropper)` call. The other dereference
+        // of this pointer is in the `poll_fn`.
+        if let Some(link) = unsafe { link_ptr.get() } {
+            if link.val.was_popped.load(Ordering::Relaxed) {
+                // If it was popped from the queue there is no need to run delete
+                dropper.defuse();
+            }
+        } else {
+            // Make sure that our link is deleted from the list before we drop this stack
+            drop(dropper);
+        }
+    }
+}

rtic-time/src/timer_queue/backend.rs

@@ -0,0 +1,44 @@
+use super::{TimerQueue, TimerQueueTicks};
+
+/// A backend definition for a monotonic clock/counter.
+pub trait TimerQueueBackend: 'static + Sized {
+    /// The type for ticks.
+    type Ticks: TimerQueueTicks;
+
+    /// Get the current time.
+    fn now() -> Self::Ticks;
+
+    /// Set the compare value of the timer interrupt.
+    ///
+    /// **Note:** This method does not need to handle race conditions of the monotonic, the timer
+    /// queue in RTIC checks this.
+    fn set_compare(instant: Self::Ticks);
+
+    /// Clear the compare interrupt flag.
+    fn clear_compare_flag();
+
+    /// Pend the timer's interrupt.
+    fn pend_interrupt();
+
+    /// Optional. Runs on interrupt before any timer queue handling.
+    fn on_interrupt() {}
+
+    /// Optional. This is used to save power, this is called when the timer queue is not empty.
+    ///
+    /// Enabling and disabling the monotonic needs to propagate to `now` so that an instant
+    /// based of `now()` is still valid.
+    ///
+    /// NOTE: This may be called more than once.
+    fn enable_timer() {}
+
+    /// Optional. This is used to save power, this is called when the timer queue is empty.
+    ///
+    /// Enabling and disabling the monotonic needs to propagate to `now` so that an instant
+    /// based of `now()` is still valid.
+    ///
+    /// NOTE: This may be called more than once.
+    fn disable_timer() {}
+
+    /// Returns a reference to the underlying timer queue.
+    fn timer_queue() -> &'static TimerQueue<Self>;
+}

rtic-time/src/timer_queue/tick_type.rs

@@ -0,0 +1,49 @@
+use core::cmp;
+
+/// The ticks of a timer.
+pub trait TimerQueueTicks: Copy + PartialEq + Eq {
+    /// Represents a single tick.
+    const ONE_TICK: Self;
+
+    /// Compares to another tick count.
+    ///
+    /// Takes into account timer wrapping; if the difference is more than
+    /// half the value range, the result will be flipped.
+    fn compare(self, other: Self) -> cmp::Ordering;
+
+    /// True if `self` is at the same time as `other` or later.
+    ///
+    /// Takes into account timer wrapping; if the difference is more than
+    /// half the value range, the result will be negated.
+    fn is_at_least(self, other: Self) -> bool {
+        match self.compare(other) {
+            cmp::Ordering::Less => false,
+            cmp::Ordering::Equal => true,
+            cmp::Ordering::Greater => true,
+        }
+    }
+
+    /// Wrapping addition.
+    fn wrapping_add(self, other: Self) -> Self;
+}
+
+impl TimerQueueTicks for u32 {
+    const ONE_TICK: Self = 1;
+
+    fn compare(self, other: Self) -> cmp::Ordering {
+        (self.wrapping_sub(other) as i32).cmp(&0)
+    }
+    fn wrapping_add(self, other: Self) -> Self {
+        u32::wrapping_add(self, other)
+    }
+}
+impl TimerQueueTicks for u64 {
+    const ONE_TICK: Self = 1;
+
+    fn compare(self, other: Self) -> cmp::Ordering {
+        (self.wrapping_sub(other) as i64).cmp(&0)
+    }
+    fn wrapping_add(self, other: Self) -> Self {
+        u64::wrapping_add(self, other)
+    }
+}

rtic-time/tests/delay_precision_subtick.rs

@@ -15,46 +15,31 @@ use std::{
     time::Duration,
 };
 
-use ::fugit::ExtU64Ceil;
 use cooked_waker::{IntoWaker, WakeRef};
+use fugit::ExtU64Ceil;
 use parking_lot::Mutex;
-use rtic_time::{Monotonic, TimeoutError, TimerQueue};
+use rtic_time::{
+    monotonic::TimerQueueBasedMonotonic,
+    timer_queue::{TimerQueue, TimerQueueBackend},
+    Monotonic,
+};
 
 const SUBTICKS_PER_TICK: u32 = 10;
 struct SubtickTestTimer;
-static TIMER_QUEUE: TimerQueue<SubtickTestTimer> = TimerQueue::new();
+struct SubtickTestTimerBackend;
+static TIMER_QUEUE: TimerQueue<SubtickTestTimerBackend> = TimerQueue::new();
 static NOW_SUBTICKS: AtomicU64 = AtomicU64::new(0);
 static COMPARE_TICKS: Mutex<Option<u64>> = Mutex::new(None);
 
-impl Monotonic for SubtickTestTimer {
-    const ZERO: Self::Instant = Self::Instant::from_ticks(0);
-    const TICK_PERIOD: Self::Duration = Self::Duration::from_ticks(1);
-
-    type Instant = fugit::Instant<u64, SUBTICKS_PER_TICK, 1000>;
-    type Duration = fugit::Duration<u64, SUBTICKS_PER_TICK, 1000>;
-
-    fn now() -> Self::Instant {
-        Self::Instant::from_ticks(
-            NOW_SUBTICKS.load(Ordering::Relaxed) / u64::from(SUBTICKS_PER_TICK),
-        )
-    }
-
-    fn set_compare(instant: Self::Instant) {
-        *COMPARE_TICKS.lock() = Some(instant.ticks());
-    }
-
-    fn clear_compare_flag() {}
-
-    fn pend_interrupt() {
-        unsafe {
-            Self::__tq().on_monotonic_interrupt();
-        }
+impl SubtickTestTimer {
+    pub fn init() {
+        SubtickTestTimerBackend::init();
     }
 }
 
-impl SubtickTestTimer {
-    pub fn init() {
-        Self::__tq().initialize(Self)
+impl SubtickTestTimerBackend {
+    fn init() {
+        Self::timer_queue().initialize(Self)
     }
 
     pub fn tick() -> u64 {
@@ -70,7 +55,7 @@ impl SubtickTestTimer {
         // );
         if subticks == 0 && Some(ticks) == *compare {
             unsafe {
-                Self::__tq().on_monotonic_interrupt();
+                Self::timer_queue().on_monotonic_interrupt();
             }
         }
 
@@ -85,29 +70,41 @@ impl SubtickTestTimer {
     pub fn now_subticks() -> u64 {
         NOW_SUBTICKS.load(Ordering::Relaxed)
     }
+}
 
-    fn __tq() -> &'static TimerQueue<Self> {
+impl TimerQueueBackend for SubtickTestTimerBackend {
+    type Ticks = u64;
+
+    fn now() -> Self::Ticks {
+        NOW_SUBTICKS.load(Ordering::Relaxed) / u64::from(SUBTICKS_PER_TICK)
+    }
+
+    fn set_compare(instant: Self::Ticks) {
+        *COMPARE_TICKS.lock() = Some(instant);
+    }
+
+    fn clear_compare_flag() {}
+
+    fn pend_interrupt() {
+        unsafe {
+            Self::timer_queue().on_monotonic_interrupt();
+        }
+    }
+
+    fn timer_queue() -> &'static TimerQueue<Self> {
         &TIMER_QUEUE
     }
-
-    /// Delay for some duration of time.
-    #[inline]
-    pub async fn delay(duration: <Self as Monotonic>::Duration) {
-        Self::__tq().delay(duration).await;
-    }
-
-    /// Timeout after a specific duration.
-    #[inline]
-    pub async fn timeout_after<F: core::future::Future>(
-        duration: <Self as Monotonic>::Duration,
-        future: F,
-    ) -> Result<F::Output, TimeoutError> {
-        Self::__tq().timeout_after(duration, future).await
-    }
 }
 
-rtic_time::embedded_hal_delay_impl_fugit64!(SubtickTestTimer);
-rtic_time::embedded_hal_async_delay_impl_fugit64!(SubtickTestTimer);
+impl TimerQueueBasedMonotonic for SubtickTestTimer {
+    type Backend = SubtickTestTimerBackend;
+
+    type Instant = fugit::Instant<u64, SUBTICKS_PER_TICK, 1000>;
+    type Duration = fugit::Duration<u64, SUBTICKS_PER_TICK, 1000>;
+}
+
+rtic_time::impl_embedded_hal_delay_fugit!(SubtickTestTimer);
+rtic_time::impl_embedded_hal_async_delay_fugit!(SubtickTestTimer);
 
 // A simple struct that counts the number of times it is awoken. Can't
 // be awoken by value (because that would discard the counter), so we
@@ -144,7 +141,7 @@ impl<F: FnOnce()> Drop for OnDrop<F> {
 macro_rules! subtick_test {
     (@run $start:expr, $actual_duration:expr, $delay_fn:expr) => {{
         // forward clock to $start
-        SubtickTestTimer::forward_to_subtick($start);
+        SubtickTestTimerBackend::forward_to_subtick($start);
 
         // call wait function
         let delay_fn = $delay_fn;
@@ -164,7 +161,7 @@ macro_rules! subtick_test {
             };
 
             assert_eq!(wakecounter.get(), 0);
-            SubtickTestTimer::tick();
+            SubtickTestTimerBackend::tick();
         }
 
         let expected_wakeups = {
@@ -177,7 +174,7 @@ macro_rules! subtick_test {
         assert_eq!(wakecounter.get(), expected_wakeups);
 
         // Tick again to test that we don't get a second wake
-        SubtickTestTimer::tick();
+        SubtickTestTimerBackend::tick();
         assert_eq!(wakecounter.get(), expected_wakeups);
 
         assert_eq!(
@@ -191,9 +188,9 @@ macro_rules! subtick_test {
 
     (@run_blocking $start:expr, $actual_duration:expr, $delay_fn:expr) => {{
         // forward clock to $start
-        SubtickTestTimer::forward_to_subtick($start);
+        SubtickTestTimerBackend::forward_to_subtick($start);
 
-        let t_start = SubtickTestTimer::now_subticks();
+        let t_start = SubtickTestTimerBackend::now_subticks();
 
         let finished = AtomicBool::new(false);
         std::thread::scope(|s|{
@@ -204,13 +201,13 @@ macro_rules! subtick_test {
             s.spawn(||{
                 sleep(Duration::from_millis(10));
                 while !finished.load(Ordering::Relaxed) {
-                    SubtickTestTimer::tick();
+                    SubtickTestTimerBackend::tick();
                     sleep(Duration::from_millis(10));
                 }
             });
         });
 
-        let t_end = SubtickTestTimer::now_subticks();
+        let t_end = SubtickTestTimerBackend::now_subticks();
         let measured_duration = t_end - t_start;
         assert_eq!(
             $actual_duration,

rtic-time/tests/timer_queue.rs

@@ -2,63 +2,24 @@
 //!
 //! To run this test, you need to activate the `critical-section/std` feature.
 
-use std::{
-    fmt::Debug,
-    task::{Poll, Waker},
-};
-
 use cassette::Cassette;
 use parking_lot::Mutex;
-use rtic_time::{Monotonic, TimerQueue};
+use rtic_time::timer_queue::{TimerQueue, TimerQueueBackend};
 
-static NOW: Mutex<Option<Instant>> = Mutex::new(None);
+mod peripheral {
+    use parking_lot::Mutex;
+    use std::{
+        sync::atomic::{AtomicU64, Ordering},
+        task::{Poll, Waker},
+    };
 
-#[derive(PartialEq, Eq, PartialOrd, Ord, Clone, Copy, Debug)]
-pub struct Duration(u64);
+    use super::TestMonoBackend;
 
-impl Duration {
-    pub const fn from_ticks(millis: u64) -> Self {
-        Self(millis)
-    }
-
-    pub fn as_ticks(&self) -> u64 {
-        self.0
-    }
-}
-
-impl core::ops::Add<Duration> for Duration {
-    type Output = Duration;
-
-    fn add(self, rhs: Duration) -> Self::Output {
-        Self(self.0 + rhs.0)
-    }
-}
-
-impl From<Duration> for Instant {
-    fn from(value: Duration) -> Self {
-        Instant(value.0)
-    }
-}
-
-static WAKERS: Mutex<Vec<Waker>> = Mutex::new(Vec::new());
-
-#[derive(PartialEq, Eq, PartialOrd, Ord, Clone, Copy, Debug)]
-pub struct Instant(u64);
-
-impl Instant {
-    const ZERO: Self = Self(0);
+    static NOW: AtomicU64 = AtomicU64::new(0);
+    static WAKERS: Mutex<Vec<Waker>> = Mutex::new(Vec::new());
 
     pub fn tick() -> bool {
-        // If we've never ticked before, initialize the clock.
-        if NOW.lock().is_none() {
-            *NOW.lock() = Some(Instant::ZERO);
-        }
-        // We've ticked before, add one to the clock
-        else {
-            let now = Instant::now();
-            let new_time = now + Duration(1);
-            *NOW.lock() = Some(new_time);
-        }
+        NOW.fetch_add(1, Ordering::Release);
 
         let had_wakers = !WAKERS.lock().is_empty();
         // Wake up all things waiting for a specific time to happen.
@@ -66,22 +27,18 @@ impl Instant {
             waker.wake_by_ref();
         }
 
-        let had_interrupt = TestMono::tick(false);
+        let had_interrupt = TestMonoBackend::tick(false);
 
         had_interrupt || had_wakers
     }
 
-    pub fn now() -> Self {
-        NOW.lock().clone().unwrap_or(Instant::ZERO)
+    pub fn now() -> u64 {
+        NOW.load(Ordering::Acquire)
     }
 
-    pub fn elapsed(&self) -> Duration {
-        Duration(Self::now().0 - self.0)
-    }
-
-    pub async fn wait_until(time: Instant) {
+    pub async fn wait_until(time: u64) {
         core::future::poll_fn(|ctx| {
-            if Instant::now() >= time {
+            if now() >= time {
                 Poll::Ready(())
             } else {
                 WAKERS.lock().push(ctx.waker().clone());
@@ -92,51 +49,21 @@ impl Instant {
     }
 }
 
-impl From<u64> for Instant {
-    fn from(value: u64) -> Self {
-        Self(value)
-    }
-}
+static COMPARE: Mutex<Option<u64>> = Mutex::new(None);
+static TIMER_QUEUE: TimerQueue<TestMonoBackend> = TimerQueue::new();
 
-impl core::ops::Add<Duration> for Instant {
-    type Output = Instant;
+pub struct TestMonoBackend;
 
-    fn add(self, rhs: Duration) -> Self::Output {
-        Self(self.0 + rhs.0)
-    }
-}
-
-impl core::ops::Sub<Duration> for Instant {
-    type Output = Instant;
-
-    fn sub(self, rhs: Duration) -> Self::Output {
-        Self(self.0 - rhs.0)
-    }
-}
-
-impl core::ops::Sub<Instant> for Instant {
-    type Output = Duration;
-
-    fn sub(self, rhs: Instant) -> Self::Output {
-        Duration(self.0 - rhs.0)
-    }
-}
-
-static COMPARE: Mutex<Option<Instant>> = Mutex::new(None);
-static TIMER_QUEUE: TimerQueue<TestMono> = TimerQueue::new();
-
-pub struct TestMono;
-
-impl TestMono {
+impl TestMonoBackend {
     pub fn tick(force_interrupt: bool) -> bool {
-        let now = Instant::now();
+        let now = peripheral::now();
 
         let compare_reached = Some(now) == Self::compare();
         let interrupt = compare_reached || force_interrupt;
 
         if interrupt {
             unsafe {
-                TestMono::queue().on_monotonic_interrupt();
+                TestMonoBackend::timer_queue().on_monotonic_interrupt();
             }
             true
         } else {
@@ -144,35 +71,26 @@ impl TestMono {
         }
     }
 
-    /// Initialize the monotonic.
-    pub fn init() {
-        Self::queue().initialize(Self);
-    }
-
-    /// Used to access the underlying timer queue
-    pub fn queue() -> &'static TimerQueue<TestMono> {
-        &TIMER_QUEUE
-    }
-
-    pub fn compare() -> Option<Instant> {
+    pub fn compare() -> Option<u64> {
         COMPARE.lock().clone()
     }
 }
 
-impl Monotonic for TestMono {
-    const ZERO: Self::Instant = Instant::ZERO;
-    const TICK_PERIOD: Self::Duration = Duration::from_ticks(1);
+impl TestMonoBackend {
+    fn init() {
+        Self::timer_queue().initialize(Self);
+    }
+}
 
-    type Instant = Instant;
+impl TimerQueueBackend for TestMonoBackend {
+    type Ticks = u64;
 
-    type Duration = Duration;
-
-    fn now() -> Self::Instant {
-        Instant::now()
+    fn now() -> Self::Ticks {
+        peripheral::now()
     }
 
-    fn set_compare(instant: Self::Instant) {
-        let _ = COMPARE.lock().insert(instant);
+    fn set_compare(instant: Self::Ticks) {
+        *COMPARE.lock() = Some(instant);
     }
 
     fn clear_compare_flag() {}
@@ -180,42 +98,40 @@ impl Monotonic for TestMono {
     fn pend_interrupt() {
         Self::tick(true);
     }
+
+    fn timer_queue() -> &'static TimerQueue<Self> {
+        &TIMER_QUEUE
+    }
 }
 
 #[test]
 fn timer_queue() {
-    TestMono::init();
-    let start = Instant::ZERO;
+    TestMonoBackend::init();
+    let start = 0;
 
     let build_delay_test = |pre_delay: Option<u64>, delay: u64| {
-        let delay = Duration::from_ticks(delay);
-        let pre_delay = pre_delay.map(Duration::from_ticks);
-
         let total = if let Some(pre_delay) = pre_delay {
             pre_delay + delay
         } else {
             delay
         };
-        let total_millis = total.as_ticks();
 
         async move {
             // A `pre_delay` simulates a delay in scheduling,
             // without the `pre_delay` being present in the timer
             // queue
             if let Some(pre_delay) = pre_delay {
-                Instant::wait_until(start + pre_delay).await;
+                peripheral::wait_until(start + pre_delay).await;
             }
 
-            TestMono::queue().delay(delay).await;
+            TestMonoBackend::timer_queue().delay(delay).await;
 
-            let elapsed = start.elapsed().as_ticks();
-            println!("{total_millis} ticks delay reached after {elapsed} ticks");
+            let elapsed = peripheral::now() - start;
+            println!("{total} ticks delay reached after {elapsed} ticks");
 
             // Expect a delay of one longer, to compensate for timer uncertainty
-            if elapsed != total_millis + 1 {
-                panic!(
-                    "{total_millis} ticks delay was not on time ({elapsed} ticks passed instead)"
-                );
+            if elapsed != total + 1 {
+                panic!("{total} ticks delay was not on time ({elapsed} ticks passed instead)");
             }
         }
     };
@@ -259,31 +175,31 @@ fn timer_queue() {
         // We only poll the waiting futures if an
         // interrupt occured or if an artificial delay
         // has passed.
-        if Instant::tick() {
+        if peripheral::tick() {
             poll!(d1, d2, d3);
         }
 
-        if Instant::now() == 0.into() {
+        if peripheral::now() == 0 {
             // First, we want to be waiting for our 300 tick delay
-            assert_eq!(TestMono::compare(), Some(301.into()));
+            assert_eq!(TestMonoBackend::compare(), Some(301));
         }
 
-        if Instant::now() == 100.into() {
+        if peripheral::now() == 100 {
             // After 100 ticks, we enqueue a new delay that is supposed to last
             // until the 200-tick-mark
-            assert_eq!(TestMono::compare(), Some(201.into()));
+            assert_eq!(TestMonoBackend::compare(), Some(201));
         }
 
-        if Instant::now() == 201.into() {
+        if peripheral::now() == 201 {
             // After 200 ticks, we dequeue the 200-tick-mark delay and
             // requeue the 300 tick delay
-            assert_eq!(TestMono::compare(), Some(301.into()));
+            assert_eq!(TestMonoBackend::compare(), Some(301));
         }
 
-        if Instant::now() == 301.into() {
+        if peripheral::now() == 301 {
             // After 300 ticks, we dequeue the 300-tick-mark delay and
             // go to the 400 tick delay that is already enqueued
-            assert_eq!(TestMono::compare(), Some(401.into()));
+            assert_eq!(TestMonoBackend::compare(), Some(401));
         }
     }
 

rtic/CHANGELOG.md

@@ -10,6 +10,9 @@ For each category, *Added*, *Changed*, *Fixed* add new entries at the top!
 ### Added
 
 - Unstable support for ESP32-C6
+### Changed
+
+- Remove unused dependency `rtic-monotonics`
 
 ## [v2.1.1] - 2024-03-13
 

rtic/Cargo.toml

@@ -33,7 +33,6 @@ cortex-m = { version = "0.7.0", optional = true }
 bare-metal = "1.0.0"
 # portable-atomic = { version = "0.3.19" }
 atomic-polyfill = "1"
-rtic-monotonics = { path = "../rtic-monotonics", version = "1.4.0", optional = true }
 rtic-macros = { path = "../rtic-macros", version = "=2.1.0" }
 rtic-core = "1"
 critical-section = "1"
@@ -71,7 +70,4 @@ riscv-clint-backend = [
 ]
 
 # needed for testing
-test-critical-section = [
-  "cortex-m/critical-section-single-core",
-  "rtic-monotonics/systick-100hz",
-]
+test-critical-section = ["cortex-m/critical-section-single-core"]

rtic/src/lib.rs

@@ -34,7 +34,6 @@
 
 pub use rtic_core::{prelude as mutex_prelude, Exclusive, Mutex};
 pub use rtic_macros::app;
-// pub use rtic_monotonic::{self, Monotonic};
 
 /// module `mutex::prelude` provides `Mutex` and multi-lock variants. Recommended over `mutex_prelude`
 pub mod mutex {

xtask/src/argument_parsing.rs

@@ -64,25 +64,28 @@ impl Package {
             }
             Package::RticMonotonics => {
                 let features = if partial {
-                    &["cortex-m-systick", "rp2040", "nrf52840"][..]
+                    &[
+                        "cortex-m-systick",
+                        "rp2040",
+                        "nrf52840",
+                        "imxrt_gpt1,imxrt-ral/imxrt1062",
+                        "stm32_tim2,stm32h725ag",
+                    ][..]
                 } else {
                     &[
-                        "cortex-m-systick,embedded-hal-async",
-                        "cortex-m-systick,systick-100hz,embedded-hal-async",
-                        "cortex-m-systick,systick-10khz,embedded-hal-async",
-                        "cortex-m-systick,embedded-hal-async,systick-64bit",
-                        "cortex-m-systick,systick-100hz,embedded-hal-async,systick-64bit",
-                        "cortex-m-systick,systick-10khz,embedded-hal-async,systick-64bit",
-                        "rp2040,embedded-hal-async",
-                        "nrf52810,embedded-hal-async",
-                        "nrf52811,embedded-hal-async",
-                        "nrf52832,embedded-hal-async",
-                        "nrf52833,embedded-hal-async",
-                        "nrf52840,embedded-hal-async",
-                        "nrf5340-app,embedded-hal-async",
-                        "nrf5340-net,embedded-hal-async",
-                        "nrf9160,embedded-hal-async",
-                        "imxrt_gpt1,imxrt-ral/imxrt1062,embedded-hal-async",
+                        "cortex-m-systick",
+                        "cortex-m-systick,systick-64bit",
+                        "rp2040",
+                        "nrf52810",
+                        "nrf52811",
+                        "nrf52832",
+                        "nrf52833",
+                        "nrf52840",
+                        "nrf5340-app",
+                        "nrf5340-net",
+                        "nrf9160",
+                        "imxrt_gpt1,imxrt_gpt2,imxrt-ral/imxrt1062",
+                        "stm32_tim2,stm32_tim3,stm32_tim4,stm32_tim5,stm32_tim15,stm32h725ag",
                     ][..]
                 };
 

xtask/src/run.rs

@@ -299,7 +299,26 @@ pub fn cargo_doc<'c>(
     backend: Backends,
     arguments: &'c Option<ExtraArguments>,
 ) -> Vec<FinalRunResult<'c>> {
-    let features = Some(backend.to_target().and_features(backend.to_rtic_feature()));
+    let extra_doc_features = [
+        "rtic-monotonics/cortex-m-systick",
+        "rtic-monotonics/rp2040",
+        "rtic-monotonics/nrf52840",
+        "imxrt-ral/imxrt1011",
+        "rtic-monotonics/imxrt_gpt1",
+        "rtic-monotonics/imxrt_gpt2",
+        "rtic-monotonics/stm32h725ag",
+        "rtic-monotonics/stm32_tim2",
+        "rtic-monotonics/stm32_tim3",
+        "rtic-monotonics/stm32_tim4",
+        "rtic-monotonics/stm32_tim5",
+        "rtic-monotonics/stm32_tim15",
+    ];
+
+    let features = Some(format!(
+        "{},{}",
+        backend.to_target().and_features(backend.to_rtic_feature()),
+        extra_doc_features.join(",")
+    ));
 
     let command = CargoCommand::Doc {
         cargoarg,