rtic/examples/cfg.rs

//! examples/cfg.rs

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

use cortex_m_semihosting::debug;
#[cfg(debug_assertions)]
use cortex_m_semihosting::hprintln;
use panic_semihosting as _;

#[rtic::app(device = lm3s6965)]
const APP: () = {
    struct Resources {
        #[cfg(debug_assertions)] // <- `true` when using the `dev` profile
        #[init(0)]
        count: u32,
    }

    #[init(spawn = [foo])]
    fn init(cx: init::Context) {
        cx.spawn.foo().unwrap();
        cx.spawn.foo().unwrap();
    }

    #[idle]
    fn idle(_: idle::Context) -> ! {
        debug::exit(debug::EXIT_SUCCESS);

        loop {
            cortex_m::asm::nop();
        }
    }

    #[task(capacity = 2, resources = [count], spawn = [log])]
    fn foo(_cx: foo::Context) {
        #[cfg(debug_assertions)]
        {
            *_cx.resources.count += 1;

            _cx.spawn.log(*_cx.resources.count).unwrap();
        }

        // this wouldn't compile in `release` mode
        // *_cx.resources.count += 1;

        // ..
    }

    #[cfg(debug_assertions)]
    #[task(capacity = 2)]
    fn log(_: log::Context, n: u32) {
        hprintln!(
            "foo has been called {} time{}",
            n,
            if n == 1 { "" } else { "s" }
        )
        .ok();
    }

    // RTIC requires that unused interrupts are declared in an extern block when
    // using software tasks; these free interrupts will be used to dispatch the
    // software tasks.
    extern "C" {
        fn SSI0();
        fn QEI0();
    }
};