cortex-m-rtfm 0.5.3

Real Time For the Masses (RTFM): a concurrency framework for building real time systems
Documentation 
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//! examples/periodic.rs

#![deny(unsafe_code)]
#![deny(warnings)]
#![no_main]
#![no_std]

use cortex_m_semihosting::hprintln;
use panic_semihosting as _;
use rtfm::cyccnt::{Instant, U32Ext};

const PERIOD: u32 = 8_000_000;

// NOTE: does NOT work on QEMU!
#[rtfm::app(device = lm3s6965, monotonic = rtfm::cyccnt::CYCCNT)]
const APP: () = {
    #[init(schedule = [foo])]
    fn init(cx: init::Context) {
        // omitted: initialization of `CYCCNT`

        cx.schedule.foo(cx.start + PERIOD.cycles()).unwrap();
    }

    #[task(schedule = [foo])]
    fn foo(cx: foo::Context) {
        let now = Instant::now();
        hprintln!("foo(scheduled = {:?}, now = {:?})", cx.scheduled, now).unwrap();

        cx.schedule.foo(cx.scheduled + PERIOD.cycles()).unwrap();
    }

    extern "C" {
        fn UART0();
    }
};