esp32 硬件看门狗 idf代码

ESP32 硬件看门狗的 IDF 代码可以参考如下示例：

#include "esp_system.h"
#include "esp_event.h"
#include "esp_log.h"
#include "driver/timer.h"

static const char *TAG = "watchdog_example";

// 定义看门狗定时器
#define WATCHDOG_TIMER_GROUP TIMER_GROUP_0
#define WATCHDOG_TIMER_IDX TIMER_0
#define WATCHDOG_TIMER_DIVIDER 16
#define WATCHDOG_TIMER_INTERVAL_SEC 10

// 声明看门狗定时器句柄
static timer_group_t watchdog_timer_group;
static timer_idx_t watchdog_timer_idx;

// 看门狗定时器回调函数
static void IRAM_ATTR watchdog_timer_callback(void *arg)
{
    esp_restart(); // 超时重启
}

void app_main()
{
    ESP_LOGI(TAG, "Starting watchdog example...");

    // 配置看门狗定时器
    const timer_config_t watchdog_timer_config = {
        .divider = WATCHDOG_TIMER_DIVIDER,
        .counter_dir = TIMER_COUNT_UP,
        .counter_en = TIMER_PAUSE,
        .alarm_en = TIMER_ALARM_EN,
        .auto_reload = TIMER_AUTORELOAD_EN,
        .alarm_val = WATCHDOG_TIMER_INTERVAL_SEC * TIMER_BASE_CLK / WATCHDOG_TIMER_DIVIDER,
    };
    timer_init(WATCHDOG_TIMER_GROUP, WATCHDOG_TIMER_IDX, &watchdog_timer_config);
    timer_set_counter_value(WATCHDOG_TIMER_GROUP, WATCHDOG_TIMER_IDX, 0);
    timer_enable_intr(WATCHDOG_TIMER_GROUP, WATCHDOG_TIMER_IDX);
    timer_isr_register(WATCHDOG_TIMER_GROUP, WATCHDOG_TIMER_IDX, watchdog_timer_callback, NULL, ESP_INTR_FLAG_IRAM, NULL);
    timer_start(WATCHDOG_TIMER_GROUP, WATCHDOG_TIMER_IDX);

    while (true)
    {
        // 每秒输出一次日志
        ESP_LOGI(TAG, "Hello world!");
        vTaskDelay(pdMS_TO_TICKS(1000));
    }
}

以上代码中，我们首先定义了看门狗定时器的一些参数，包括定时器所在的定时器组、定时器编号、分频系数、定时器超时时间等。然后在 `app_main` 函数中进行了看门狗定时器的配置和启动，并在死循环中每秒输出一次日志。当看门狗定时器超时时，会触发回调函数 `watchdog_timer_callback`，在该函数中调用 `esp_restart` 函数进行系统重启。