rtic/examples/cfg-whole-task.rs

//! examples/cfg-whole-task.rs

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

use panic_semihosting as _;

#[rtic::app(device = lm3s6965,  dispatchers = [SSI0, QEI0])]
mod app {
    use cortex_m_semihosting::debug;
    #[cfg(debug_assertions)]
    use cortex_m_semihosting::hprintln;

    #[shared]
    struct Shared {
        count: u32,
        #[cfg(never)]
        unused: u32,
    }

    #[local]
    struct Local {}

    #[init]
    fn init(_: init::Context) -> (Shared, Local, init::Monotonics) {
        foo::spawn().unwrap();
        foo::spawn().unwrap();

        (
            Shared {
                count: 0,
                #[cfg(never)]
                unused: 1,
            },
            Local {},
            init::Monotonics(),
        )
    }

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

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

    #[task(capacity = 2, shared = [count])]
    fn foo(mut _cx: foo::Context) {
        #[cfg(debug_assertions)]
        {
            _cx.shared.count.lock(|count| *count += 1);

            log::spawn(_cx.shared.count.lock(|count| *count)).unwrap();
        }

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

        // ..
    }

    // The whole task should disappear,
    // currently still present in the Tasks enum
    #[cfg(never)]
    #[task(capacity = 2, shared = [count])]
    fn foo2(mut _cx: foo2::Context) {
        #[cfg(debug_assertions)]
        {
            _cx.shared.count.lock(|count| *count += 10);

            log::spawn(_cx.shared.count.lock(|count| *count)).unwrap();
        }

        // this wouldn't compile in `release` mode
        // *_cx.shared.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" }
        );
    }
}