Fclk=32768/[(PREDIV_S+1)*(PREDIV_A+1)]

void RTC_Config(void)

 {

RTC_InitTypeDef RTC_InitStruct;

RCC_APB1PeriphClockCmd(RCC_APB1Periph_PWR,ENABLE);

PWR_RTCAccessCmd(ENABLE);

#if defined RTC_CLOCK_SOURCE_LSI

RTC_LSICmd(ENABLE);

 while(RCC_GetFlagStatus(RCC_FLAG_LSIRDY) == RESET);

RCC_RTCCLKConfig(RCC_RTCCLKSource_LSI);

#elif defined RTC_CLOCK_SOURCE_LSE

RTC_LSEConfig(RCC_LSE_ON);

while(RCC_GetFlagStatus(RCC_FLAG_LSERDY) == RESET);

RCC_RTCCLKConfig(RCC_RTCCLKSource_LSE);

 #else #error Please select the RTC Clock Source inside the main.c file

#endif

RCC_RTCCLKCmd(ENABLE);

RTC_WaitForSynchro();

 RTC_InitStruct.RTC_HourFormat = RTC_HourFormat_24;

RTC_InitStruct.RTC_AsynchPrediv = 0x7F;

RTC_InitStruct.RTC_SynchPrediv = 0xFF;

 RTC_Init(&RTC_InitStruct);

}

void RTC_TimeRegulate(void)

 {

RTC_TimeTypeDef RTC_TimeStruct;

RTC_DateTypeDef RTC_DateStruct;

RTC_TimeStruct.RTC_Hours = 23;

RTC_TimeStruct.RTC_Minutes = 59;

RTC_TimeStruct.RTC_Seconds = 59;

RTC_TimeStruct.RTC_H12 = RTC_H12_AM;

RTC_SetTime(RTC_Format_BIN,&RTC_TImeStruct);

RTC_DateStruct.RTC_Year = 12;

RTC_DateStruct.RTC_Date = 31;

RTC_DateStruct.RTC_Month = 12;

RTC_DateStruct.RTC_WeekDay = 1;

RTC_SetDate(RTC_Format_BIN,&RTC_DateStruct);

}

void RTC_TimeShow(unsigned char *pDate)

{

RTC_TimeTypeDef RTC_TimeStruct;

RTC_DateTypeDef RTC_DateStruct;

RTC_GetTime(RTC_Format_BIN,&RTC_TImeStruct);

RTC_GetDate(RTC_Format_BIN,&RTC_DateStruct);

pDate[0] = RTC_TimeStruct.RTC_Hours;

pDate[1] = RTC_TimeStruct.RTC_Minutes;

pDate[2] = RTC_TimeStruct.RTC_Seconds ;

pDate[3] = RTC_DateStruct.RTC_Year;

pDate[4] = RTC_DateStruct.RTC_Date;

pDate[5] = RTC_DateStruct.RTC_Month ;

pDate[6] = RTC_DateStruct.RTC_WeekDay ;

}