embassy_app_cpu_example.rs

//! embassy wait
//!
//! This is an example of asynchronously `Wait`ing for a pin state to change.

#![no_std]
#![no_main]
#![feature(type_alias_impl_trait)]

use embassy_executor::Executor;
use embassy_time::{Duration, Timer};
use embedded_hal_async::digital::Wait;
use esp32_hal::{
    clock::ClockControl,
    cpu_control::CpuControl,
    embassy,
    gpio::{Gpio0, Input, PullDown},
    peripherals::Peripherals,
    prelude::*,
    timer::TimerGroup,
    Rtc,
    IO,
};
use esp_backtrace as _;
use esp_println::println;
use static_cell::StaticCell;

#[embassy_executor::task]
async fn ping(mut pin: Gpio0<Input<PullDown>>) {
    loop {
        esp_println::println!("Waiting...");
        pin.wait_for_rising_edge().await.unwrap();
        esp_println::println!("Ping!");
        Timer::after(Duration::from_millis(100)).await;
    }
}

static EXECUTOR: StaticCell<Executor> = StaticCell::new();

#[entry]
fn main() -> ! {
    esp_println::println!("Init!");
    esp_println::logger::init_logger_from_env();
    let peripherals = Peripherals::take();
    let system = peripherals.DPORT.split();
    let clocks = ClockControl::boot_defaults(system.clock_control).freeze();

    let mut cpu_control = CpuControl::new(system.cpu_control);
    let mut cpu1_fnctn = || {
        let peripherals = unsafe { Peripherals::steal() };
        let mut system = peripherals.DPORT.split();
        let mut rtc = Rtc::new(peripherals.RTC_CNTL);
        let timer_group0 = TimerGroup::new(
            peripherals.TIMG0,
            &clocks,
            &mut system.peripheral_clock_control,
        );
        let mut wdt0 = timer_group0.wdt;
        let timer_group1 = TimerGroup::new(
            peripherals.TIMG1,
            &clocks,
            &mut system.peripheral_clock_control,
        );
        let mut wdt1 = timer_group1.wdt;

        // Disable watchdog timers
        rtc.rwdt.disable();
        wdt0.disable();
        wdt1.disable();
        println!("Init embassy... on core {:?}", esp32_hal::get_core());
        #[cfg(feature = "embassy-time-systick")]
        embassy::init(
            &clocks,
            esp32_hal::systimer::SystemTimer::new(peripherals.SYSTIMER),
        );

        #[cfg(feature = "embassy-time-timg0")]
        embassy::init(&clocks, timer_group0.timer0);

        let io = IO::new(peripherals.GPIO, peripherals.IO_MUX);
        // GPIO 0 as input
        let input = io.pins.gpio0.into_pull_down_input();

        println!("Enable GPIO");
        // Async requires the GPIO interrupt to wake futures
        esp32_hal::interrupt::enable(
            esp32_hal::peripherals::Interrupt::GPIO,
            esp32_hal::interrupt::Priority::Priority1,
        )
        .unwrap();

        let executor = EXECUTOR.init(Executor::new());
        executor.run(|spawner| {
            println!("Spawning task");
            spawner.spawn(ping(input)).ok();
        });
    };

    println!("About to start CPU1");
    let _guard = cpu_control.start_app_core(&mut cpu1_fnctn).unwrap();

    println!("Started CPU1");

    loop {}
}