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#![no_main]
#![no_std]
#![feature(type_alias_impl_trait)]
use panic_semihosting as _;
// NOTES:
//
// - Async tasks cannot have `#[lock_free]` resources, as they can interleve and each async
// task can have a mutable reference stored.
// - Spawning an async task equates to it being polled once.
#[rtic::app(device = lm3s6965, dispatchers = [SSI0, UART0], peripherals = true)]
mod app {
use core::{
future::Future,
pin::Pin,
task::{Context, Poll},
};
use cortex_m_semihosting::{debug, hprintln};
use systick_monotonic::*;
#[shared]
struct Shared {}
#[local]
struct Local {}
#[monotonic(binds = SysTick, default = true)]
type MyMono = Systick<100>;
#[init]
fn init(cx: init::Context) -> (Shared, Local, init::Monotonics) {
hprintln!("init").unwrap();
foo::spawn().ok();
bar::spawn().ok();
(
Shared {},
Local {},
init::Monotonics(Systick::new(cx.core.SYST, 12_000_000)),
)
}
#[idle]
fn idle(_: idle::Context) -> ! {
loop {
cortex_m::asm::wfi(); // put the MCU in sleep mode until interrupt occurs
}
}
#[task]
async fn foo(_cx: foo::Context) {
hprintln!("hello from foo").ok();
// This will not timeout
match monotonics::timeout_after(monotonics::delay(100.millis()), 200.millis()).await {
Ok(_) => hprintln!("foo no timeout").ok(),
Err(_) => hprintln!("foo timeout").ok(),
};
}
#[task]
async fn bar(_cx: bar::Context) {
hprintln!("hello from bar").ok();
// This will timeout
match monotonics::timeout_after(NeverEndingFuture {}, 300.millis()).await {
Ok(_) => hprintln!("bar no timeout").ok(),
Err(_) => hprintln!("bar timeout").ok(),
};
debug::exit(debug::EXIT_SUCCESS);
}
pub struct NeverEndingFuture {}
impl Future for NeverEndingFuture {
type Output = ();
fn poll(self: Pin<&mut Self>, _: &mut Context<'_>) -> Poll<Self::Output> {
// Never finish
Poll::Pending
}
}
}
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