RT Thread看门狗调用

            rs485_slave_thread_UART4 = rt_thread_create("rs485_slave_thread_UART4", rs485_slave_thread_entry_UART4, RT_NULL, 2048, 15, 10);

void idle_hook(void)
{
    /* 在空闲线程的回调函数里喂狗 */
    rt_device_control(wdg_dev, RT_DEVICE_CTRL_WDT_KEEPALIVE, NULL);
    // 打印喂狗信息，可在调试完成后根据需要去掉
    rt_kprintf("feed the dog!\n");
}
static int wdt_sample(void)
{
    rt_err_t ret = RT_EOK;
    // 根据设备名称查找看门狗设备，获取设备句柄
    wdg_dev = rt_device_find(WDT_DEVICE_NAME);
    if (!wdg_dev) {
        // 打印查找设备失败信息
        rt_kprintf("find %s failed!\n", WDT_DEVICE_NAME);
        return RT_ERROR;
    }
    // 初始化设备
    ret = rt_device_init(wdg_dev);
    if (ret!= RT_EOK) {
        // 打印设备初始化失败信息
        rt_kprintf("initialize %s failed!\n", WDT_DEVICE_NAME);
        return RT_ERROR;
    }
    // 设置看门狗溢出时间
    ret = rt_device_control(wdg_dev, RT_DEVICE_CTRL_WDT_SET_TIMEOUT, &WDT_TIMEOUT);
    if (ret!= RT_EOK) {
        // 打印设置超时时间失败信息
        rt_kprintf("set %s timeout failed!\n", WDT_DEVICE_NAME);
        return RT_ERROR;
    }
    // 启动看门狗
    ret = rt_device_control(wdg_dev, RT_DEVICE_CTRL_WDT_START, RT_NULL);
    if (ret!= RT_EOK) {
        // 打印启动设备失败信息
        rt_kprintf("start %s failed!\n", WDT_DEVICE_NAME);
        return RT_ERROR;
    }
    // 设置空闲线程回调函数
    rt_thread_idle_sethook(idle_hook);
    return ret;
}
int main(void)
{
    at24c64_Config();
    led_init();
    system_startup_init();
    /* 初始化看门狗 */
    wdt_sample();
    int count = 1;
    rt_pin_mode(LED, PIN_MODE_OUTPUT);
    while (count++)
    {
        //运行led
        rt_pin_write(LED, PIN_LOW);
        rt_thread_mdelay(100);
        rt_pin_write(LED, PIN_HIGH);
        rt_thread_mdelay(100);
    }
    return RT_EOK;
}