rtic/examples/stm32f3_blinky/src/main.rs

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

use panic_rtt_target as _;
use rtic::app;
use rtic_monotonics::systick::*;
use rtt_target::{rprintln, rtt_init_print};
use stm32f3xx_hal::gpio::{Output, PushPull, PA5};
use stm32f3xx_hal::prelude::*;

#[app(device = stm32f3xx_hal::pac, peripherals = true, dispatchers = [SPI1])]
mod app {
    use super::*;

    #[shared]
    struct Shared {}

    #[local]
    struct Local {
        led: PA5<Output<PushPull>>,
        state: bool,
    }

    #[init]
    fn init(cx: init::Context) -> (Shared, Local) {
        // Setup clocks
        let mut flash = cx.device.FLASH.constrain();
        let mut rcc = cx.device.RCC.constrain();

        // Initialize the systick interrupt & obtain the token to prove that we did
        let systick_mono_token = rtic_monotonics::create_systick_token!();
        Systick::start(cx.core.SYST, 36_000_000, systick_mono_token); // default STM32F303 clock-rate is 36MHz

        rtt_init_print!();
        rprintln!("init");

        let _clocks = rcc
            .cfgr
            .use_hse(8.MHz())
            .sysclk(36.MHz())
            .pclk1(36.MHz())
            .freeze(&mut flash.acr);

        // Setup LED
        let mut gpioa = cx.device.GPIOA.split(&mut rcc.ahb);
        let mut led = gpioa
            .pa5
            .into_push_pull_output(&mut gpioa.moder, &mut gpioa.otyper);
        led.set_high().unwrap();

        // Schedule the blinking task
        blink::spawn().ok();

        (Shared {}, Local { led, state: false })
    }

    #[task(local = [led, state])]
    async fn blink(cx: blink::Context) {
        loop {
            rprintln!("blink");
            if *cx.local.state {
                cx.local.led.set_high().unwrap();
                *cx.local.state = false;
            } else {
                cx.local.led.set_low().unwrap();
                *cx.local.state = true;
            }
            Systick::delay(1000.millis()).await;
        }
    }
}