STM32F051C8T6进入休眠反复重启，且休眠无法唤醒

2万 · 2018-10-12 15:53

STM32F051C8T6进入休眠反复重启，且休眠无法唤醒，代码如下，直接从官方例程拷贝过来用的
      RTC_InitTypeDef RTC_InitStructure;
      RTC_AlarmTypeDef  RTC_AlarmStructure;
      RTC_TimeTypeDef RTC_TimeStructure;

      /* Enable the PWR clock */
      RCC_APB1PeriphClockCmd(RCC_APB1Periph_PWR, ENABLE);

      /* Allow access to Backup Domain */
      PWR_BackupAccessCmd(ENABLE);

      /* Check if the StandBy flag is set */
      if (PWR_GetFlagStatus(PWR_FLAG_SB) != RESET)
      {
            /* Clear StandBy flag */
            PWR_ClearFlag(PWR_FLAG_SB);

            /* Check if the StandBy flag is cleared */
            if (PWR_GetFlagStatus(PWR_FLAG_SB) != RESET)
            {
                     while(1);
            }

            RTC_WaitForSynchro();

            /* No need to configure the RTC as the RTC config(clock source, enable,
            prescaler,...) are kept after wake-up from STANDBY */
      }
      else
      {
            /* RTC Configuration ******************************************************/
            /* Reset Backup Domain */
            RCC_BackupResetCmd(ENABLE);
            RCC_BackupResetCmd(DISABLE);

            /* Enable the LSI OSC */
            RCC_LSICmd(ENABLE);
            /* Wait till LSI is ready */
            while (RCC_GetFlagStatus(RCC_FLAG_LSIRDY) == RESET)
            {}

            /* Select the RTC Clock Source */
            RCC_RTCCLKConfig(RCC_RTCCLKSource_LSI);

            /* Enable the RTC Clock */
            RCC_RTCCLKCmd(ENABLE);

            /* Wait for RTC APB registers synchronisation */
            RTC_WaitForSynchro();

            RTC_InitStructure.RTC_HourFormat = RTC_HourFormat_24;
            RTC_InitStructure.RTC_AsynchPrediv = 0x7F;
            RTC_InitStructure.RTC_SynchPrediv = 0x0138;

            RTC_Init(&RTC_InitStructure);

            /* Set the alarm X+5s */
            RTC_AlarmStructure.RTC_AlarmTime.RTC_H12    = RTC_H12_AM;
            RTC_AlarmStructure.RTC_AlarmTime.RTC_Hours = 0x01;
            RTC_AlarmStructure.RTC_AlarmTime.RTC_Minutes = 0x00;
            RTC_AlarmStructure.RTC_AlarmTime.RTC_Seconds = 0x3;
            RTC_AlarmStructure.RTC_AlarmDateWeekDay = 0x31;
            RTC_AlarmStructure.RTC_AlarmDateWeekDaySel = RTC_AlarmDateWeekDaySel_Date;
            RTC_AlarmStructure.RTC_AlarmMask = RTC_AlarmMask_DateWeekDay;
            RTC_SetAlarm(RTC_Format_BCD, RTC_Alarm_A, &RTC_AlarmStructure);

            /* Enable RTC Alarm A Interrupt */
            RTC_ITConfig(RTC_IT_ALRA, ENABLE);

            /* Enable the alarm */
            RTC_AlarmCmd(RTC_Alarm_A, ENABLE);
      }

      /* Set the time to 01h 00mn 00s AM */
      RTC_TimeStructure.RTC_H12    = RTC_H12_AM;
      RTC_TimeStructure.RTC_Hours = 0x01;
      RTC_TimeStructure.RTC_Minutes = 0x00;
      RTC_TimeStructure.RTC_Seconds = 0x00;

      RTC_SetTime(RTC_Format_BCD, &RTC_TimeStructure);

      /* Clear Wakeup flag */
      PWR_ClearFlag(PWR_FLAG_WU);

      RTC_ClearFlag(RTC_FLAG_ALRAF);

      /* Request to enter STANDBY mode (Wake Up flag is cleared in PWR_EnterSTANDBYMode function) */
      PWR_EnterSTANDBYMode();