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RP2040(树莓派Pico) 看门狗

 3 years ago
source link: https://www.taterli.com/7559/
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RP2040(树莓派Pico) 看门狗

这个芯片内置看门狗,但是只是最基础的看门狗,不过RP2040的很多外设都是很基础的配置,按照手册来说,他可以定时范围从你绝对喂不上狗(1个WDG周期)到16秒左右,但是根据SDK限制,你最短是50ms,最长是8秒,为什么8秒?又是一个芯片设计BUG…

如果因为看门狗功能导致复位,上电后可以通过watchdog_caused_reboot判断复位源,通过watchdog_enable进行参数初始化,可以选择是否在DEBUG模式暂停,但是低功耗模式所有时钟都停了的时候他也不例外,通过定期的watchdog_update喂狗,可以不被狗咬,没有中断功能,也没有窗口喂狗的能力,所以我认为这个大概是史上最简单的外设了.


int main() {
    stdio_init_all();

    if (watchdog_caused_reboot()) {
        printf("Rebooted by Watchdog!\n");
        return 0;
    } else {
        printf("Clean boot\n");
    }

    // Enable the watchdog, requiring the watchdog to be updated every 100ms or the chip will reboot
    // second arg is pause on debug which means the watchdog will pause when stepping through code
    watchdog_enable(100, 1);

    for (uint i = 0; i < 5; i++) {
        printf("Updating watchdog %d\n", i);
        watchdog_update();
    }

    // Wait in an infinite loop and don't update the watchdog so it reboots us
    printf("Waiting to be rebooted by watchdog\n");
    while(1);
}

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