rtic/examples/baseline.rs

//! examples/baseline.rs

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

use panic_semihosting as _;

// NOTE: does NOT properly work on QEMU
#[rtic::app(device = lm3s6965, monotonic = rtic::cyccnt::CYCCNT, dispatchers = [SSI0])]
mod app {
    use cortex_m_semihosting::{debug, hprintln};
    use lm3s6965::Interrupt;

    #[init]
    fn init(cx: init::Context) -> init::LateResources {
        // omitted: initialization of `CYCCNT`

        hprintln!("init(baseline = {:?})", cx.start).unwrap();

        // `foo` inherits the baseline of `init`: `Instant(0)`
        foo::spawn().unwrap();

        init::LateResources {}
    }

    #[task]
    fn foo(cx: foo::Context) {
        static mut ONCE: bool = true;

        hprintln!("foo(baseline = {:?})", cx.scheduled).unwrap();

        if *ONCE {
            *ONCE = false;

            rtic::pend(Interrupt::UART0);
        } else {
            debug::exit(debug::EXIT_SUCCESS);
        }
    }

    #[task(binds = UART0)]
    fn uart0(cx: uart0::Context) {
        hprintln!("UART0(baseline = {:?})", cx.start).unwrap();

        // `foo` inherits the baseline of `UART0`: its `start` time
        foo::spawn().unwrap();
    }
}