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87 lines
2.5 KiB
Rust
87 lines
2.5 KiB
Rust
//! Demonstrates initialization of resources in `init`.
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#![deny(unsafe_code)]
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#![deny(warnings)]
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#![feature(proc_macro)]
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#![no_std]
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extern crate cortex_m_rtfm as rtfm;
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extern crate stm32f103xx;
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use rtfm::{app, Threshold};
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app! {
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device: stm32f103xx,
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resources: {
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// Usually, resources are initialized with a constant initializer:
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static ON: bool = false;
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// However, there are cases where this is not possible or not desired.
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// For example, there may not be a sensible value to use, or the type may
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// not be constructible in a constant (like `Vec`).
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//
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// While it is possible to use an `Option` in some cases, that requires
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// you to properly initialize it and `.unwrap()` it at every use. It
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// also consumes more memory.
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//
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// To solve this, it is possible to defer initialization of resources to
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// `init` by omitting the initializer. Doing that will require `init` to
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// return the values of all "late" resources.
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static IP_ADDRESS: u32;
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// PORT is used by 2 tasks, making it a shared resource. This just tests
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// another internal code path and is not important for the example.
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static PORT: u16;
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},
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idle: {
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// Test that late resources can be used in idle
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resources: [IP_ADDRESS],
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},
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tasks: {
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SYS_TICK: {
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priority: 1,
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path: sys_tick,
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resources: [IP_ADDRESS, PORT, ON],
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},
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EXTI0: {
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priority: 2,
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path: exti0,
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resources: [PORT],
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}
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}
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}
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// The signature of `init` is now required to have a specific return type.
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fn init(_p: init::Peripherals, _r: init::Resources) -> init::LateResources {
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// `init::Resources` does not contain `IP_ADDRESS`, since it is not yet
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// initialized.
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//_r.IP_ADDRESS; // doesn't compile
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// ...obtain value for IP_ADDRESS from EEPROM/DHCP...
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let ip_address = 0x7f000001;
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init::LateResources {
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// This struct will contain fields for all resources with omitted
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// initializers.
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IP_ADDRESS: ip_address,
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PORT: 0,
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}
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}
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fn sys_tick(_t: &mut Threshold, r: SYS_TICK::Resources) {
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// Other tasks can access late resources like any other, since they are
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// guaranteed to be initialized when tasks are run.
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r.IP_ADDRESS;
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}
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fn exti0(_t: &mut Threshold, _r: EXTI0::Resources) {}
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fn idle(_t: &mut Threshold, _r: idle::Resources) -> ! {
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loop {
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rtfm::wfi();
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}
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}
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