Improved docs on where the 12 MHz comes from in SysTick

examples/cancel-reschedule.rs

@@ -25,7 +25,7 @@ mod app {
     fn init(cx: init::Context) -> (Shared, Local, init::Monotonics) {
         let systick = cx.core.SYST;
 
-        // Initialize the monotonic
+        // Initialize the monotonic (SysTick rate in QEMU is 12 MHz)
         let mono = Systick::new(systick, 12_000_000);
 
         hprintln!("init").ok();

examples/common.rs

@@ -33,6 +33,8 @@ mod app {
     #[init]
     fn init(cx: init::Context) -> (Shared, Local, init::Monotonics) {
         let systick = cx.core.SYST;
+
+        // Initialize the monotonic (SysTick rate in QEMU is 12 MHz)
         let mono = Systick::new(systick, 12_000_000);
 
         // Spawn the task `foo` directly after `init` finishes

examples/periodic.rs

@@ -25,6 +25,7 @@ mod app {
     fn init(cx: init::Context) -> (Shared, Local, init::Monotonics) {
         let systick = cx.core.SYST;
 
+        // Initialize the monotonic (SysTick rate in QEMU is 12 MHz)
         let mono = Systick::new(systick, 12_000_000);
 
         foo::spawn_after(1.secs()).unwrap();

examples/schedule.rs

@@ -25,7 +25,7 @@ mod app {
     fn init(cx: init::Context) -> (Shared, Local, init::Monotonics) {
         let systick = cx.core.SYST;
 
-        // Initialize the monotonic
+        // Initialize the monotonic (SysTick rate in QEMU is 12 MHz)
         let mono = Systick::new(systick, 12_000_000);
 
         hprintln!("init").ok();

examples/t-schedule.rs

@@ -25,6 +25,7 @@ mod app {
     fn init(cx: init::Context) -> (Shared, Local, init::Monotonics) {
         let systick = cx.core.SYST;
 
+        // Initialize the monotonic (SysTick rate in QEMU is 12 MHz)
         let mono = Systick::new(systick, 12_000_000);
 
         debug::exit(debug::EXIT_SUCCESS); // Exit QEMU simulator