rtic/examples/full-syntax.rs

//! A showcase of the `app!` macro syntax

#![deny(unsafe_code)]
#![feature(const_fn)]
#![feature(proc_macro)]
#![no_std]

extern crate cortex_m_rtfm as rtfm;
extern crate stm32f103xx;

use rtfm::{app, Resource, Threshold};

app! {
    device: stm32f103xx,

    resources: {
        static CO_OWNED: u32 = 0;
        static ON: bool = false;
        static OWNED: bool = false;
        static SHARED: bool = false;
    },

    init: {
        path: init_, // this is a path to the "init" function
    },

    idle: {
        path: idle_, // this is a path to the "idle" function
        resources: [OWNED, SHARED],
    },

    tasks: {
        SYS_TICK: {
            path: sys_tick,
            priority: 1,
            resources: [CO_OWNED, ON, SHARED],
        },

        TIM2: {
            // tasks are enabled, between `init` and `idle`, by default but they
            // can start disabled if `false` is specified here
            enabled: false,
            path: tim2,
            priority: 1,
            resources: [CO_OWNED],
        },
    },
}

fn init_(_p: init::Peripherals, _r: init::Resources) {}

fn idle_(t: &mut Threshold, mut r: idle::Resources) -> ! {
    loop {
        *r.OWNED != *r.OWNED;

        if *r.OWNED {
            if r.SHARED.claim(t, |shared, _| **shared) {
                rtfm::wfi();
            }
        } else {
            r.SHARED.claim_mut(t, |shared, _| **shared = !**shared);
        }
    }
}

fn sys_tick(_t: &mut Threshold, r: SYS_TICK::Resources) {
    **r.ON = !**r.ON;

    **r.CO_OWNED += 1;
}

fn tim2(_t: &mut Threshold, r: TIM2::Resources) {
    **r.CO_OWNED += 1;
}