stm32 RTC闹钟唤醒 低功耗模式

rtc初始化

void MX_RTC_Init(void)
{

  RTC_TimeTypeDef sTime = {0};
  RTC_DateTypeDef DateToUpdate = {0};

  hrtc.Instance = RTC;
  hrtc.Init.AsynchPrediv = RTC_AUTO_1_SECOND;
  hrtc.Init.OutPut = RTC_OUTPUTSOURCE_ALARM;
  if (HAL_RTC_Init(&hrtc) != HAL_OK)
  {
    Error_Handler();
  }

  /* USER CODE BEGIN Check_RTC_BKUP */

	RTC_SET_Alarm(&sTime );
	
	if(HAL_RTCEx_BKUPRead(&hrtc,RTC_BKP_DR1)!=0X1234)
		{
				HAL_RTCEx_BKUPWrite(&hrtc,RTC_BKP_DR1,0X1234);

		}else return;
  /* USER CODE END Check_RTC_BKUP */

  /** Initialize RTC and set the Time and Date
  */
  sTime.Hours = 0x0;
  sTime.Minutes = 0x0;
  sTime.Seconds = 0x0;

  if (HAL_RTC_SetTime(&hrtc, &sTime, RTC_FORMAT_BCD) != HAL_OK)
  {
    Error_Handler();
  }
  DateToUpdate.WeekDay = RTC_WEEKDAY_MONDAY;
  DateToUpdate.Month = RTC_MONTH_JANUARY;
  DateToUpdate.Date = 0x1;
  DateToUpdate.Year = 0x0;

  if (HAL_RTC_SetDate(&hrtc, &DateToUpdate, RTC_FORMAT_BCD) != HAL_OK)
  {
    Error_Handler();
  }
}

void RTC_SET_Alarm(RTC_TimeTypeDef * sTime )
{	
    RTC_AlarmTypeDef alarm;
    HAL_RTC_GetTime(&hrtc, sTime, RTC_FORMAT_BIN);
 
    sTime->Seconds += ALARM_INTERVAL;
    if(sTime->Seconds >=60)
    {
        sTime->Minutes += 1;
        sTime->Seconds = sTime->Seconds-60;
        if(sTime->Minutes >=60)
        {
            sTime->Hours += 1;
            sTime->Minutes = 0;
            if(sTime->Hours >=24)
                sTime->Hours = 0;
        }
    }else ;

    alarm.AlarmTime.Hours   = sTime->Hours;
    alarm.AlarmTime.Minutes = sTime->Minutes ;
    alarm.AlarmTime.Seconds = sTime->Seconds ;
    alarm.Alarm = RTC_ALARM_A;

    if(HAL_RTC_SetAlarm_IT(&hrtc, &alarm, RTC_FORMAT_BIN)!= HAL_OK)
     {
        Error_Handler();
     }

}

主函数

int main(void)
{

  HAL_Init();
  SystemClock_Config();

  MX_GPIO_Init();
  MX_RTC_Init();
  MX_USART1_UART_Init();
  while (1)
  {
    /* USER CODE BEGIN 3 */
    
		HAL_Delay(100);
		HAL_GPIO_WritePin(GPIOE, GPIO_PIN_5, GPIO_PIN_RESET);
		HAL_Delay(100);
		HAL_GPIO_WritePin(GPIOE, GPIO_PIN_5, GPIO_PIN_SET);
		
		HAL_RTC_GetTime(&hrtc, &GetTime, RTC_FORMAT_BIN);
		/* Get the RTC current Date */
		HAL_RTC_GetDate(&hrtc, &GetData, RTC_FORMAT_BIN);

		/* Display date Format : yy/mm/dd */
		printf("%02d/%02d/%02d\r\n",2000 + GetData.Year, GetData.Month, GetData.Date);
		/* Display time Format : hh:mm:ss */
		printf("%02d:%02d:%02d\r\n",GetTime.Hours, GetTime.Minutes, GetTime.Seconds);

	    printf("\r\n");

		HAL_SuspendTick(); 
        HAL_PWR_EnterSTOPMode(PWR_MAINREGULATOR_ON,PWR_SLEEPENTRY_WFI;

		SystemClock_Config();
		MX_RTC_Init();
  }
  /* USER CODE END 3 */
}

5秒唤醒一次还是挺准的