void Sys_Standby(void)
{  
        printf(" 进入待机 ");

//        RCC_APB1PeriphClockCmd(RCC_APB1Periph_PWR, ENABLE);        //使能PWR外设时钟
        PWR_WakeUpPinCmd(PWR_WakeUpPin_1, ENABLE);  //使能唤醒管脚功能
        PWR_WakeUpPinCmd(PWR_WakeUpPin_2, ENABLE);
        PWR_EnterSTANDBYMode();          //进入待命（STANDBY）模式                  
}


void Rtc_Init(void)
{
        RTC_InitTypeDef RTC_InitStructure;
        RTC_TimeTypeDef  RTC_TimeStruct;

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

        /* Allow access to RTC */
        PWR_RTCAccessCmd(ENABLE);

        /* Reset RTC Domain */
        RCC_RTCResetCmd(ENABLE);
        RCC_RTCResetCmd(DISABLE);

        // xw
        /* Enable the LSI OSC */
        RCC_LSICmd(ENABLE);
        /* Wait till LSI is ready */  
        while(RCC_GetFlagStatus(RCC_FLAG_LSIRDY) == RESET);
//        RtcWkup_Gpio_Init();        //        
        /* Select the RTC Clock Source */
        RCC_RTCCLKConfig(RCC_RTCCLKSource_LSI);

        /* Configure the RTC data register and RTC prescaler */
        RTC_InitStructure.RTC_AsynchPrediv = 0x7F;
        RTC_InitStructure.RTC_SynchPrediv  = 0xFF;
        RTC_InitStructure.RTC_HourFormat   = RTC_HourFormat_24;
        RTC_Init(&RTC_InitStructure);

        /* Set the time to 00h 00mn 00s AM */
        RTC_TimeStruct.RTC_H12     = RTC_H12_AM;
        RTC_TimeStruct.RTC_Hours   = 0x00;
        RTC_TimeStruct.RTC_Minutes = 0x00;
        RTC_TimeStruct.RTC_Seconds = 0x00;  
        RTC_SetTime(RTC_Format_BIN, &RTC_TimeStruct);
        /* Enable the RTC Clock */
        RCC_RTCCLKCmd(ENABLE);

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

        Rtc_AlarmConfig();
}



// 当用来唤醒时, 便不会进入中断函数
void RTC_Alarm_IRQHandler(void)
{
  /* Check on the AlarmA falg and on the number of interrupts per Second (60*8) */
  if(RTC_GetITStatus(RTC_IT_ALRA) != RESET)
  {
        /* Clear RTC AlarmA Flags */
    RTC_ClearITPendingBit(RTC_IT_ALRA);

//        printf(" 一场游戏一场梦 ");
        RTC_AlarmCmd(RTC_Alarm_A, DISABLE);
        RtcAlarmTime_Set();
//        Rtc_AlarmConfig();
  }
  /* Clear the EXTIL line 17 */
  EXTI_ClearITPendingBit(EXTI_Line17);
}


void Rtc_AlarmConfig(void)
{
        EXTI_InitTypeDef EXTI_InitStructure;
        //  RTC_AlarmTypeDef RTC_AlarmStructure;
        NVIC_InitTypeDef NVIC_InitStructure;


        /* EXTI configuration */
        EXTI_ClearITPendingBit(EXTI_Line17);
        EXTI_InitStructure.EXTI_Line = EXTI_Line17;
        EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
        EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising;
        EXTI_InitStructure.EXTI_LineCmd = ENABLE;
        EXTI_Init(&EXTI_InitStructure);

        /* Enable the RTC Alarm Interrupt */
        NVIC_InitStructure.NVIC_IRQChannel = RTC_Alarm_IRQn;
        NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
        NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3;
        NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
        NVIC_Init(&NVIC_InitStructure);
       
        /* Set the alarmA Masks */
        // xw
        //  RTC_AlarmStructure.RTC_AlarmMask = RTC_AlarmMask_DateWeekDay|RTC_AlarmMask_Hours|RTC_AlarmMask_Minutes;
        //  RTC_AlarmStructure.RTC_AlarmMask = RTC_AlarmMask_All;
        //  RTC_AlarmStructure.RTC_AlarmTime.RTC_Seconds += 10;
        //  RTC_SetAlarm(RTC_Format_BIN, RTC_Alarm_A, &RTC_AlarmStructure);
        RtcAlarmTime_Set();

        /* Set AlarmA subseconds and enable SubSec Alarm : generate 8 interripts per Second */
        RTC_AlarmSubSecondConfig(RTC_Alarm_A, 0xFF, RTC_AlarmSubSecondMask_SS14_5);

//        RTC_OutputConfig(RTC_Output_AlarmA, RTC_OutputPolarity_High);
       
        /* Enable AlarmA interrupt */
        RTC_ITConfig(RTC_IT_ALRA, ENABLE);

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



// 设置RTC 报警时间间隔
void RtcAlarmTime_Set(void)
{
        RTC_AlarmTypeDef RTC_AlarmStructure;


        // xw
        RTC_GetTime(RTC_Format_BIN, &(RTC_AlarmStructure.RTC_AlarmTime));
//        printf("rtc %d, %d, %d", RTC_AlarmStructure.RTC_AlarmTime.RTC_Hours, RTC_AlarmStructure.RTC_AlarmTime.RTC_Minutes, RTC_AlarmStructure.RTC_AlarmTime.RTC_Seconds);
        RTC_AlarmStructure.RTC_AlarmTime.RTC_Seconds = (RTC_AlarmStructure.RTC_AlarmTime.RTC_Seconds+5)%60;
        /* Set the alarmA Masks */
          RTC_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);
}