stm32f4 discovery RTC Alarm

Note a few points in the manual:

RTC_SetAlarm() :The Alarm register can only be written when the corresponding Alarm is disabled (Use the RTC_AlarmCmd(DISABLE)).   

All RTC interrupts are connected to the EXTI controller.

Configure and enable the EXTI Line 17 in interrupt mode and select the rising edge sensitivity using the EXTI_Init() function.

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void RTC_Config(void) 
{ 
    RTC_InitTypeDef RTC_InitStructure; 
    RTC_TimeTypeDef RTC_TimeStructure; 
    RTC_DateTypeDef RTC_DateStructure; 
    RTC_AlarmTypeDef RTC_AlarmStructure; 
    EXTI_InitTypeDef EXTI_InitStructure;

    PWR_BackupAccessCmd(ENABLE);//Open configuration register permissionsRCC_HSEConfig 
    (RCC_HSE_ON); 
    while(RCC_GetFlagStatus(RCC_FLAG_HSERDY)==RESET);//Wait for the clock to stabilizeRCC_RTCCLKConfig 
    ((RCC_RTCCLKSource_HSE_Div31));//Clock divisionRCC_RTCCLKCmd 
    (ENABLE);//Enable RTC clock

    if(RTC_ReadBackupRegister(RTC_BKP_DR0)!=0x9527)//A flag to see if the RTC has been configured 
    { 
        RTC_WriteProtectionCmd(DISABLE);

        RTC_EnterInitMode(); 
        RTC_InitStructure.RTC_HourFormat=RTC_HourFormat_24; 
        RTC_InitStructure.RTC_AsynchPrediv=0x7D-1;//There are two frequency divisions. Less than 0x7F 
        RTC_InitStructure.RTC_SynchPrediv=0x811-1;//Less than 0x7FFF 
        RTC_Init(&RTC_InitStructure);

        RTC_TimeStructure.RTC_Seconds = 0x00; 
        RTC_TimeStructure.RTC_Minutes = 0x01; 
        RTC_TimeStructure.RTC_Hours = 0x01; 
        RTC_TimeStructure.RTC_H12 = RTC_H12_AM; 
        RTC_SetTime(RTC_Format_BCD,&RTC_TimeStructure); //Set the initial time

        RTC_DateStructure.RTC_Date = 15; 
        RTC_DateStructure.RTC_Month = 11; 
        RTC_DateStructure.RTC_WeekDay= RTC_Weekday_Thursday; 
        RTC_DateStructure.RTC_Year = 13; 
        RTC_SetDate(RTC_Format_BCD,&RTC_DateStructure);//设置初始日期

        RTC_ExitInitMode(); 
        RTC_WriteBackupRegister(RTC_BKP_DR0,0X9527); //Initialization completed, set flag 
        RTC_WriteProtectionCmd(ENABLE); 
    } 
    PWR_BackupAccessCmd(DISABLE); 
    RTC_WaitForSynchro();//Wait for RTC Time and Date register and RTC APB clock to be synchronized

    PWR_BackupAccessCmd(ENABLE); //Open configuration register permissions

    RTC_AlarmCmd(RTC_Alarm_A,DISABLE); 
    //Set the alarm to trigger every 5 secondsRTC_AlarmStructure.RTC_AlarmTime.RTC_Hours 
    =1; 
    RTC_AlarmStructure.RTC_AlarmTime.RTC_Minutes=1; 
    RTC_AlarmStructure.RTC_AlarmTime.RTC_Seconds=5; 
    RTC_AlarmStructure.RTC_AlarmTime.RTC_H12=RTC_H12_AM; 
    //RTC_AlarmStructure.RTC_AlarmMask=RTC_AlarmMask_All; //This will trigger the alarm once every 
    secondRTC_AlarmStructure.RTC_AlarmMask=RTC_AlarmMask_DateWeekDay| 
        RTC_AlarmMask_Hours|RTC_AlarmMask_Minutes;

    RTC_SetAlarm(RTC_Format_BIN,RTC_Alarm_A,&RTC_AlarmStructure); 
    RTC_AlarmCmd(RTC_Alarm_A,ENABLE); 
    RTC_ITConfig(RTC_IT_ALRA,ENABLE); 
    //Interrupt priority setting see nvic.c 
    PWR_BackupAccessCmd(DISABLE);

    //Alarm must configure 
    EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt; 
    EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising; //Rising edge 
    EXTI_InitStructure.EXTI_LineCmd = ENABLE; 
    EXTI_InitStructure.EXTI_Line = EXTI_Line17; 
    EXTI_Init(&EXTI_InitS structure); 
} 
void RTC_Alarm_IRQHandler(void) 
{ 
    if(RTC_GetFlagStatus (RTC_FLAG_ALRAF)==SET) 
    { 
        printf("alarm come \r\n"); 
        PWR_BackupAccessCmd(ENABLE);//Must exist, otherwise RTC_ClearITPendingBit will not succeed 
        RTC_ClearITPendingBit(RTC_IT_ALRA); 
        PWR_BackupAccessCmd(DISABLE); 
        EXTI_ClearITPendingBit(EXTI_Line17);//Note that this sentence is required, otherwise the interrupt will always be triggered and the main loop will not be executed. 
    } 
}

Main loop:

while (1) 
{ 
    PD12_Toggle; 
    RTC_GetTime(RTC_Format_BIN,&rtc_time); 
    RTC_GetDate(RTC_Format_BIN,&rtc_date); 
    printf("date:20%d-%d-%d ",rtc_date.RTC_Year,rtc_date.RTC_Month, 
            rtc_date.RTC_Date); 
    printf("time:%d:%d:%d\r\n",rtc_time.RTC_Hours,rtc_time.RTC_Minutes, 
            rtc_time.RTC_Seconds); 
    Delay_ms(1000); 
}

Running effect: The alarm is triggered every 5 seconds: