rtc.c

STM32的低功耗例程

/******************** (C) COPYRIGHT 2007 STMicroelectronics ********************
* File Name          : rtc.c
* Author             : MCD Application Team
* Version            : V1.0
* Date               : 10/10/2007
* Description        : This file provides RTC firmware functions
********************************************************************************
* THE PRESENT SOFTWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS
* WITH CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE TIME.
* AS A RESULT, STMICROELECTRONICS SHALL NOT BE HELD LIABLE FOR ANY DIRECT,
* INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING FROM THE
* CONTENT OF SUCH SOFTWARE AND/OR THE USE MADE BY CUSTOMERS OF THE CODING
* INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS.
*******************************************************************************/

/* Includes ------------------------------------------------------------------*/
#include "stm32f10x_lib.h"
#include "usart.h"
#include "rtc.h"

/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
#define RTCClockSource_LSE

//#define RTCClockSource_LSI

/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
/* Private function prototypes -----------------------------------------------*/
/* Private functions ---------------------------------------------------------*/ 

/*******************************************************************************
* Function Name  : RTC_Configuration
* Description    : Configures the RTC.
* Input          : None
* Output         : None
* Return         : None
*******************************************************************************/
void RTC_Configuration(void)
{
  /* Enable PWR and BKP clocks */
  RCC_APB1PeriphClockCmd(RCC_APB1Periph_PWR | RCC_APB1Periph_BKP, ENABLE);
  
  /* Allow access to BKP Domain */
  PWR_BackupAccessCmd(ENABLE);

  /* Reset Backup Domain */
  BKP_DeInit();

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

  /* Select LSI as RTC Clock Source */
  RCC_RTCCLKConfig(RCC_RTCCLKSource_LSI);  
#elif defined	RTCClockSource_LSE  
  /* Enable LSE */
  RCC_LSEConfig(RCC_LSE_ON);
  /* Wait till LSE is ready */
  while(RCC_GetFlagStatus(RCC_FLAG_LSERDY) == RESET)
  {
  }

  /* Select LSE as RTC Clock Source */
  RCC_RTCCLKConfig(RCC_RTCCLKSource_LSE);  
#endif


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


#ifdef RTCClockOutput_Enable  
  /* Disable the Tamper Pin */
  BKP_TamperPinCmd(DISABLE); /* To output RTCCLK/64 on Tamper pin, the tamper
                               functionality must be disabled */
                               
  /* Enable RTC Clock Output on Tamper Pin */
  BKP_RTCCalibrationClockOutputCmd(ENABLE);
#endif 
		  
  /* Wait for RTC registers synchronization */
  RTC_WaitForSynchro();

  /* Wait until last write operation on RTC registers has finished */
  RTC_WaitForLastTask();
  
  /* Enable the RTC Second */  
  RTC_ITConfig(RTC_IT_SEC, ENABLE);

  /* Wait until last write operation on RTC registers has finished */
  RTC_WaitForLastTask();
  
  /* Set RTC prescaler: set RTC period to 1sec */
#ifdef RTCClockSource_LSI
  RTC_SetPrescaler(39999); /* RTC period = RTCCLK/RTC_PR = (40.000 KHz)/(39999+1) */
#elif defined	RTCClockSource_LSE
  RTC_SetPrescaler(32767); /* RTC period = RTCCLK/RTC_PR = (32.768 KHz)/(32767+1) */
#endif
  
  /* Wait until last write operation on RTC registers has finished */
  RTC_WaitForLastTask();
}


/*******************************************************************************
* Function Name  : Time_Regulate
* Description    : Returns the time entered by user, using Hyperterminal.
* Input          : None
* Output         : None
* Return         : Current time RTC counter value
*******************************************************************************/
u32 Time_Regulate(void)
{
  u32 Tmp_HH = 0xFF, Tmp_MM = 0xFF, Tmp_SS = 0xFF;

  printf("\r\n==============Time Settings=====================================");
  printf("\r\n  Please Set Hours");
  
  while(Tmp_HH == 0xFF)
  {
    Tmp_HH = USART_Scanf(23);
  }
  printf(":  %d", Tmp_HH); 
  printf("\r\n  Please Set Minutes");
  while(Tmp_MM == 0xFF)
  {
    Tmp_MM = USART_Scanf(59);
  }
  printf(":  %d", Tmp_MM); 
  printf("\r\n  Please Set Seconds");
  while(Tmp_SS == 0xFF)
  {
    Tmp_SS = USART_Scanf(59);
  }
  printf(":  %d", Tmp_SS); 

  /* Return the value to store in RTC counter register */
  return((Tmp_HH*3600 + Tmp_MM*60 + Tmp_SS));
}

/*******************************************************************************
* Function Name  : Time_Adjust
* Description    : Adjusts time.
* Input          : None
* Output         : None
* Return         : None
*******************************************************************************/
void Time_Adjust(void)
{
  /* Wait until last write operation on RTC registers has finished */
  RTC_WaitForLastTask(); 
  /* Change the current time */
  RTC_SetCounter(Time_Regulate());
  /* Wait until last write operation on RTC registers has finished */
  RTC_WaitForLastTask();   
}

/*******************************************************************************
* Function Name  : Time_Display
* Description    : Displays the current time.
* Input          : - TimeVar: RTC counter value.
* Output         : None
* Return         : None
*******************************************************************************/
void Time_Display(u32 TimeVar)
{ 
  u32 THH = 0, TMM = 0, TSS = 0;
  /* Compute  hours */
  THH = TimeVar/3600;
  /* Compute minutes */
  TMM = (TimeVar % 3600)/60;
  /* Compute seconds */
  TSS = (TimeVar % 3600)% 60;

  printf("Time: %0.2d:%0.2d:%0.2d\r",THH, TMM, TSS);
}

/******************* (C) COPYRIGHT 2007 STMicroelectronics *****END OF FILE****/