STM32 实时时钟例程

#include "stm32f10x.h"
#include "stm32f10x_bkp.h"
#include "stm32f10x_gpio.h"
#include "stm32f10x_rcc.h"
#include "stm32f10x_usart.h"
#include "stm32f10x_rtc.h"
#include "stm32f10x_flash.h"
#include "stm32f10x_pwr.h"
#include "misc.h"
#include <stdio.h>

#define RTCClockSource_LSE   

vu32 TimeDisplay = 0;
ErrorStatus HSEStartUpStatus;

uint8_t SysBuffer1[30]="\r\n RTC not yet configured....";
uint8_t SysBuffer2[30]="\r\n RTC configured....";
uint8_t SysBuffer3[30]="\r\n Power On Reset occurred....";
uint8_t SysBuffer4[30]="\r\n External Reset occurred....";
uint8_t SysBuffer5[30]="\r\n No need to configure RTC\n";
uint8_t SysBuffer6[30]="\r";

void RCC_Configuration(void);
void GPIO_Configuration(void);
void USART_Configuration(void);
void RTC_Configuration(void);
void NVIC_Configuration(void);
void Time_Adjust(void);
void Time_Show(void);

void Time_Display(u32 TimeVar);
u32 Time_Regulate(void);
u8 USART_Scanf(u32 value);

int main(void)
{
  int i;
  RCC_Configuration();
  NVIC_Configuration();   
  GPIO_Configuration();  
  USART_Configuration();   
  if(BKP_ReadBackupRegister(BKP_DR1) != 0xA5A5)    
  {
    for (i=0;SysBuffer1[i]!='\0';i++)
{
         USART_SendData(USART1,SysBuffer1[i]);
         while(USART_GetFlagStatus(USART1,USART_FLAG_TC) == RESET);
        }
    RTC_Configuration();    
    for (i=0;SysBuffer2[i]!='\0';i++)
{
         USART_SendData(USART1,SysBuffer2[i]);
         while(USART_GetFlagStatus(USART1,USART_FLAG_TC) == RESET);
        }
    Time_Adjust();
    BKP_WriteBackupRegister(BKP_DR1, 0xA5A5);        
        }
  else
       {
    if(RCC_GetFlagStatus(RCC_FLAG_PORRST) != RESET)