rtc alarm在每天模式下频繁异常触发回调

发布于 2023-10-17 18:59:45 浏览：619 订阅该版

RT-thread 4.1.1，STM32F405RG，RTC和alarm都做好适配了，设置闹钟为RT_ALARM_DAILY模式，会一直触发回调，改成分钟模式工作就正常。

```c
static rt_alarm_t update_time_alarm = RT_NULL;

void update_time_alarm_cb(rt_alarm_t alarm, time_t timestamp)
{
    LOG_D("update time alarm ring!");
	//do something
	rt_mb_send(msg_to_esp, (rt_uint32_t)update_time_msg);
}

static void create_update_time_alarm(void *parameter)
{
    struct rt_alarm_setup setup = {0};
    time_t now;
    struct tm p_tm = {0};
	
    /* 获取当前时间戳 */
    now = time(NULL)+5;
    LOG_D("TIME: %d", now);
    gmtime_r(&now, &p_tm);
    /* 每天更新一次 */
    setup.flag = RT_ALARM_DAILY;
    setup.wktime.tm_year = p_tm.tm_year;
    setup.wktime.tm_mon = p_tm.tm_mon;
    setup.wktime.tm_mday = p_tm.tm_mday;
    setup.wktime.tm_wday = p_tm.tm_wday;
    setup.wktime.tm_hour = p_tm.tm_hour;
    setup.wktime.tm_min = p_tm.tm_min;
    setup.wktime.tm_sec = p_tm.tm_sec;

update_time_alarm = rt_alarm_create(update_time_alarm_cb, &setup);
    if (RT_NULL != update_time_alarm)
    {
        rt_alarm_start(update_time_alarm);
    }
}
```

![screenshot_image.png](https://oss-club.rt-thread.org/uploads/20231017/c31fbff2a801ff58315d9f135987aead.png)

如果改为分钟触发模式，其他代码不动，就一切正常：

```c
setup.flag = RT_ALARM_MINUTE;
```

![screenshot_image.png](https://oss-club.rt-thread.org/uploads/20231017/513ec37b2bb574e1776a253c28ea4a9d.png)

每日触发模式，注释掉回调中的rt_mb_send，从LOG看起来也正常，没有多次异常触发

百思不得其解，难道是alarm设计上不允许在回调里发送邮件？那分钟触发模式又一切正常