獨立看門狗外設常用來檢測系統是否死機、系統卡死、指令跑飛等異常的場景。PY32F030 的獨立看門狗是一個獨立的 12 位向下計數器。由 LSI 提供時鐘。喂狗周期最長達 32 秒。

示例：examples/embassy_iwdg.rs

#![no_std]
#![no_main]

use py32f030_hal as hal;
use {defmt_rtt as _, panic_probe as _};

use embassy_executor::Spawner;
use embassy_time::Timer;
use hal::iwdg::{Config, IWdg};

#[embassy_executor::main]
asyncfn main(_spawner: Spawner) {
    let p = hal::init(Default::default());
    defmt::info!("Hello World!");

    let config: Config = Default::default();
    defmt::info!("iwdg timeout: {}us", config.timeout_us());
    let iwdg = IWdg::new(p.IWdg, config);
    iwdg.start();

    letmut cnt: u32 = 0;
    loop {
        defmt::info!("time {} ", cnt);
        iwdg.feed();
        cnt += 1;
        // 10 秒內喂狗
        if cnt <= 10 {
            Timer::after_millis(1000).await;
        } else {
            // 10秒后等待喂狗超時
            Timer::after_secs(30).await;
        }
    }
}

運行：cargo r --example embassy_iwdg --features embassy