rtc.c

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/******************** (C) COPYRIGHT 2003 STMicroelectronics ********************
* File Name          : rtc.c
* Author             : MCD Application Team
* Date First Issued  : 09/30/2003
* Description        : This file provides all the RTC software functions
********************************************************************************
* History:
*  30/11/2004 : V2.0
*  14/07/2004 : V1.3
*  01/01/2004 : V1.2
*******************************************************************************
 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.
*******************************************************************************/

#include "rtc.h"

// Global interrupt
#define RTC_GI_Mask   0x0008
#define RTC_GI_Index  3

// OverFlow interrupt
#define RTC_OWI_Mask  0x0004
#define RTC_OWI_Index 2

// Alarm interrupt
#define RTC_AI_Mask   0x0002
#define RTC_AI_Index  1

// Second interrupt
#define RTC_SI_Mask   0x0001

// Configuration Flag Mask
#define RTC_CNF_Mask  0x0010

// Operation OFF flag
#define RTC_RTOFF_Mask   0x0020

/*******************************************************************************
* Function Name  : RTC_Delay
* Description    : This routine is used to insert a delay
* Input          : None
* Return         : None
*******************************************************************************/
void RTC_Delay( void )
{
  u16 _Tmp;
  for (_Tmp = 0x0; _Tmp < 0x7F; _Tmp ++);
}

/*******************************************************************************
* Function Name  : RTC_CounterConfig
* Description    : This routine is used to update the RTC counter value
* Input          : The new counter value.
* Return         : None
*******************************************************************************/
void RTC_CounterConfig (u32 CounterValue)
{
  /*  Wait For Last Task Completition */
  RTC_WaitForLastTask();

  /*  Enter to configuration mode */
  RTC_EnterCfgMode();

  /*  Wait For Last Task Completition */
  RTC_WaitForLastTask();

/* Update the RTC counter register with the new time and date */
  /* Update the CNTL register */
  RTC->CNTL = (u16)CounterValue;

  /*  Wait For Last Task Completition */
  RTC_WaitForLastTask();

  /* Update the CNTH register */
  RTC->CNTH = (u16)(CounterValue  >> 16);

  /*  Wait For Last Task Completition */
  RTC_WaitForLastTask();

  /*  Exit From Configuration Mode */
  RTC_ExitCfgMode ();
}

/*******************************************************************************
* Function Name  : RTC_PrescalerConfig
* Description    : This routine is used to set the Prescaler Value
* Input          : The New prescaler Value
* Return         : None
*******************************************************************************/
void RTC_PrescalerConfig (u32 Xprescaler)
{
  if ( RTC_PrescalerValue () != Xprescaler )
  {
    // Wait For Last Task Completion
    RTC_WaitForLastTask ();
    // Enter In Configuration Mode
    RTC_EnterCfgMode ();
    // Wait For Last Task Completion
    RTC_WaitForLastTask();
    // Set the prescaler MSB  part
    RTC->PRLH = (Xprescaler & 0x000F0000) >> 16;
    // Wait For Last Task Completion
    RTC_WaitForLastTask();
    // Set the prescaler LSB  part
    RTC->PRLL = (Xprescaler & 0x0000FFFF);
    // Wait For Last Task Completion
    RTC_WaitForLastTask();
    // Exit From Configuration Mode
    RTC_ExitCfgMode ();
    // Wait For Last Task Completion
    RTC_WaitForLastTask ();
  }
}

/*******************************************************************************
* Function Name  : RTC_AlarmConfig
* Description    : This routine is used to set the RTC alarm Value
* Input          : an u32 value that holds the Real Time clock alarm time.
* Return         : None
*******************************************************************************/
void RTC_AlarmConfig (u32 Xalarm)
{
  // Wait For Last Task Completion
  RTC_WaitForLastTask ();
  // Enter In Configuration Mode
  RTC_EnterCfgMode ();
  // Wait For Last Task Completion
  RTC_WaitForLastTask();
  // Set The MSB part of the Alarm Time
  RTC->ALRH = (Xalarm & 0xFFFF0000) >> 16;
  // Wait For Last Task Completion
  RTC_WaitForLastTask();
  // Set The LSB part of the Alarm Time
  RTC->ALRL = (Xalarm & 0x0000FFFF);
  // Wait For Last Task Completion
  RTC_WaitForLastTask();
  // Exit From Configuration Mode
  RTC_ExitCfgMode ();
  // Wait For Last Task Completion
  RTC_WaitForLastTask ();
}

/*******************************************************************************
* Function Name  : RTC_FlagClear
* Description    : This routine is used to clear the RTC flags
* Input          : an RTC flag
* Return         : None
*******************************************************************************/
void RTC_FlagClear (RTC_FLAGS Xflag)
{
  // Wait For Last Task Completion
  RTC_WaitForLastTask();
  // Enter In Configuration Mode
  RTC_EnterCfgMode();
  // Wait For Last Task Completion
  RTC_WaitForLastTask();
  // Clear an RTC flag
  RTC->CRL &= ~Xflag;
  // Wait For Last Task Completion
  RTC_WaitForLastTask();
  // Exit From Configuration Mode
  RTC_ExitCfgMode ();
  // Wait For Last Task Completion
  RTC_WaitForLastTask();
}

/*******************************************************************************
* Function Name  : RTC_ITClear
* Description    : This routine is used to clear the RTC interrupts
* Input          : an RTC interrupt
* Return         : None
*******************************************************************************/
void RTC_ITClear (RTC_IT Xrtcit)
{
  // Wait For Last Task Completion
  RTC_WaitForLastTask();
  // Enter In Configuration Mode
  RTC_EnterCfgMode();
  // Clears an RTC interrupt
  RTC->CRL &= ~Xrtcit;
  // Exit From Configuration Mode
  RTC_ExitCfgMode ();
  // Wait For Last Task Completion
  RTC_WaitForLastTask ();
}

/*******************************************************************************
* Function Name  : RTC_EnterCfgMode
* Description    : This routine is used to enter in the Configuration Mode
* Input          : None
* Return         : None
*******************************************************************************/
void RTC_EnterCfgMode(void)
{
  // Set the CNF flag to enter in the Configuration Mode
  RTC->CRL |= RTC_CNF_Mask;
  // Wait For Last Task Completion
  RTC_WaitForLastTask ();
}

/*******************************************************************************
* Function Name  : RTC_ExitCfgMode
* Description    : This routine is used to exit from the Configuration Mode
* Input          : None
* Return         : None
*******************************************************************************/
void RTC_ExitCfgMode(void)
{
  // Reset the CNF flag to exit from the Configuration Mode
  RTC->CRL &= ~RTC_CNF_Mask;
  // Wait For Last Task Completion
  RTC_WaitForLastTask ();
}

/*******************************************************************************
* Function Name  : RTC_WaitForLastTask
* Description    : This routine waits for the last task completion
* Input          : None
* Return         : None
*******************************************************************************/
void RTC_WaitForLastTask(void)
{
  // Loop until the Last operation Completion
  while (!(RTC->CRL & RTC_RTOFF_Mask));
}
/******************* (C) COPYRIGHT 2003 STMicroelectronics *****END OF FILE****/