stm32l431 RTC ALARM 只跳一次中断

supeng1010

最近调试RTC ALARM功能，发现闹钟只能进中断一次，下次就不进中断了，中断里也重新设置了闹钟。
void HAL_RTC_AlarmAEventCallback(RTC_HandleTypeDef *hrtc)
{
        //uint8_t Hours,Minutes;
        uint8_t offset = 0;
        RTC_AlarmTypeDef sAlarm = {0};
        //RTC_TimeTypeDef sTime = {0};
        /*if(HAL_OK == HAL_RTC_GetTime(hrtc,&sTime,RTC_FORMAT_BIN))
        {
                Hours = sTime.Hours;
                Minutes = sTime.Minutes;
        }*/
        ALARM_FLG = 1;
        sAlarm.AlarmTime.Hours = 0x08;
  sAlarm.AlarmTime.Minutes = 0x32;
  sAlarm.AlarmTime.Seconds = 0x0;
  sAlarm.AlarmTime.SubSeconds = 0x0;
  sAlarm.AlarmTime.DayLightSaving = RTC_DAYLIGHTSAVING_NONE;
  sAlarm.AlarmTime.StoreOperation = RTC_STOREOPERATION_RESET;
  sAlarm.AlarmMask = RTC_ALARMMASK_NONE;
  sAlarm.AlarmSubSecondMask = RTC_ALARMSUBSECONDMASK_ALL;
  sAlarm.AlarmDateWeekDaySel = RTC_ALARMDATEWEEKDAYSEL_DATE;
  sAlarm.AlarmDateWeekDay = 0x1;
  sAlarm.Alarm = RTC_ALARM_A;
  if (HAL_RTC_SetAlarm_IT(hrtc, &sAlarm, RTC_FORMAT_BCD) != HAL_OK)
  {
    Error_Handler();
  }
        offset += 2;
}