Subversion Repositories openrisc

/******************** (C) COPYRIGHT 2007 STMicroelectronics ********************

* File Name          : stm32f10x_rtc.c

* Author             : MCD Application Team

* Date First Issued  : 09/29/2006

* Description        : This file provides all the RTC firmware functions.

********************************************************************************

* History:

* 04/02/2007: V0.2

* 02/05/2007: V0.1

* 09/29/2006: V0.01

********************************************************************************

* 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_rtc.h"

/* Private typedef -----------------------------------------------------------*/

/* Private define ------------------------------------------------------------*/

#define CRL_CNF_Set      ((u16)0x0010)      /* Configuration Flag Enable Mask */

#define CRL_CNF_Reset    ((u16)0xFFEF)      /* Configuration Flag Disable Mask */

#define RTC_LSB_Mask     ((u32)0x0000FFFF)  /* RTC LSB Mask */

#define RTC_MSB_Mask     ((u32)0xFFFF0000)  /* RTC MSB Mask */

#define PRLH_MSB_Mask    ((u32)0x000F0000)  /* RTC Prescaler MSB Mask */

/* Private macro -------------------------------------------------------------*/

/* Private variables ---------------------------------------------------------*/

/* Private function prototypes -----------------------------------------------*/

/* Private functions ---------------------------------------------------------*/

/*******************************************************************************

* Function Name  : RTC_ITConfig

* Description    : Enables or disables the specified RTC interrupts.

* Input          : - RTC_IT: specifies the RTC interrupts sources to be enabled

*                    or disabled.

*                    This parameter can be any combination of the following values:

*                       - RTC_IT_OW: Overflow interrupt

*                       - RTC_IT_ALR: Alarm interrupt

*                       - RTC_IT_SEC: Second interrupt

*                  - NewState: new state of the specified RTC interrupts.

*                    This parameter can be: ENABLE or DISABLE.

* Output         : None

* Return         : None

*******************************************************************************/

void RTC_ITConfig(u16 RTC_IT, FunctionalState NewState)

{

  /* Check the parameters */

  assert(IS_RTC_IT(RTC_IT));

  assert(IS_FUNCTIONAL_STATE(NewState));

  if (NewState != DISABLE)

  {

    RTC->CRH |= RTC_IT;

  }

  else

  {

    RTC->CRH &= (u16)~RTC_IT;

  }

}

/*******************************************************************************

* Function Name  : RTC_EnterConfigMode

* Description    : Enters the RTC configuration mode.

* Input          : None

* Output         : None

* Return         : None

*******************************************************************************/

void RTC_EnterConfigMode(void)

{

  /* Set the CNF flag to enter in the Configuration Mode */

  RTC->CRL |= CRL_CNF_Set;

}

/*******************************************************************************

* Function Name  : RTC_ExitConfigMode

* Description    : Exits from the RTC configuration mode.

* Input          : None

* Output         : None

* Return         : None

*******************************************************************************/

void RTC_ExitConfigMode(void)

{

  /* Reset the CNF flag to exit from the Configuration Mode */

  RTC->CRL &= CRL_CNF_Reset;

}

/*******************************************************************************

* Function Name  : RTC_GetCounter

* Description    : Gets the RTC counter value.

* Input          : None

* Output         : None

* Return         : RTC counter value.

*******************************************************************************/

u32 RTC_GetCounter(void)

{

  u16 tmp = 0;

  tmp = RTC->CNTL;

  return (((u32)RTC->CNTH << 16 ) | tmp) ;

}

/*******************************************************************************

* Function Name  : RTC_SetCounter

* Description    : Sets the RTC counter value.

* Input          : - CounterValue: RTC counter new value.

* Output         : None

* Return         : None

*******************************************************************************/

void RTC_SetCounter(u32 CounterValue)

{

  RTC_EnterConfigMode();

  /* Set RTC COUNTER MSB word */

  RTC->CNTH = (CounterValue & RTC_MSB_Mask) >> 16;

  /* Set RTC COUNTER LSB word */

  RTC->CNTL = (CounterValue & RTC_LSB_Mask);

  RTC_ExitConfigMode();

}

/*******************************************************************************

* Function Name  : RTC_GetPrescaler

* Description    : Gets the RTC prescaler value.

* Input          : None

* Output         : None

* Return         : RTC prescaler value.

*******************************************************************************/

u32 RTC_GetPrescaler(void)

{

  u32 tmp = 0x00;

  tmp = ((u32)RTC->PRLH & (u32)0x000F) << 0x10;

  tmp |= RTC->PRLL;

  return tmp;

}

/*******************************************************************************

* Function Name  : RTC_SetPrescaler

* Description    : Sets the RTC prescaler value.

* Input          : - PrescalerValue: RTC prescaler new value.

* Output         : None

* Return         : None

*******************************************************************************/

void RTC_SetPrescaler(u32 PrescalerValue)

{

  /* Check the parameters */

  assert(IS_RTC_PRESCALER(PrescalerValue));

  RTC_EnterConfigMode();

  /* Set RTC PRESCALER MSB word */

  RTC->PRLH = (PrescalerValue & PRLH_MSB_Mask) >> 0x10;

  /* Set RTC PRESCALER LSB word */

  RTC->PRLL = (PrescalerValue & RTC_LSB_Mask);

  RTC_ExitConfigMode();

}

/*******************************************************************************

* Function Name  : RTC_SetAlarm

* Description    : Sets the RTC alarm value.

* Input          : - AlarmValue: RTC alarm new value.

* Output         : None

* Return         : None

*******************************************************************************/

void RTC_SetAlarm(u32 AlarmValue)

{

  RTC_EnterConfigMode();

  /* Set the ALARM MSB word */

  RTC->ALRH = (AlarmValue & RTC_MSB_Mask) >> 16;

  /* Set the ALARM LSB word */

  RTC->ALRL = (AlarmValue & RTC_LSB_Mask);

  RTC_ExitConfigMode();

}

/*******************************************************************************

* Function Name  : RTC_GetDivider

* Description    : Gets the RTC divider value.

* Input          : None

* Output         : None

* Return         : RTC Divider value.

*******************************************************************************/

u32 RTC_GetDivider(void)

{

  u32 tmp = 0x00;

  tmp = ((u32)RTC->DIVH & (u32)0x000F) << 0x10;

  tmp |= RTC->DIVL;

  return tmp;

}

/*******************************************************************************

* Function Name  : RTC_WaitForLastTask

* Description    : Waits until last write operation on RTC registers has finished.

*                  This function must be called before any write to RTC registers.

* Input          : None

* Output         : None

* Return         : None

*******************************************************************************/

void RTC_WaitForLastTask(void)

{

  /* Loop until RTOFF flag is set */

  while ((RTC->CRL & RTC_FLAG_RTOFF) == (u16)RESET)

  {

  }

}

/*******************************************************************************

* Function Name  : RTC_WaitForSynchro

* Description    : Waits until the RTC registers (RTC_CNT, RTC_ALR and RTC_PRL)

*                  are synchronized with RTC APB clock.

*                  This function must be called before any read operation after

*                  an APB reset or an APB clock stop.

* Input          : None

* Output         : None

* Return         : None

*******************************************************************************/

void RTC_WaitForSynchro(void)

{

  /* Clear RSF flag */

  RTC->CRL &= (u16)~RTC_FLAG_RSF;

  /* Loop until RSF flag is set */

  while ((RTC->CRL & RTC_FLAG_RSF) == (u16)RESET)

  {

  }

}

/*******************************************************************************

* Function Name  : RTC_GetFlagStatus

* Description    : Checks whether the specified RTC flag is set or not.

* Input          : - RTC_FLAG: specifies the flag to check.

*                    This parameter can be one the following values:

*                       - RTC_FLAG_RTOFF: RTC Operation OFF flag

*                       - RTC_FLAG_RSF: Registers Synchronized flag

*                       - RTC_FLAG_OW: Overflow flag

*                       - RTC_FLAG_ALR: Alarm flag

*                       - RTC_FLAG_SEC: Second flag

* Output         : None

* Return         : The new state of RTC_FLAG (SET or RESET).

*******************************************************************************/

FlagStatus RTC_GetFlagStatus(u16 RTC_FLAG)

{

  FlagStatus bitstatus = RESET;

  /* Check the parameters */

  assert(IS_RTC_GET_FLAG(RTC_FLAG));

  if ((RTC->CRL & RTC_FLAG) != (u16)RESET)

  {

    bitstatus = SET;

  }

  else

  {

    bitstatus = RESET;

  }

  return bitstatus;

}

/*******************************************************************************

* Function Name  : RTC_ClearFlag

* Description    : Clears the RTC’s pending flags.

* Input          : - RTC_FLAG: specifies the flag to clear.

*                    This parameter can be any combination of the following values:

*                       - RTC_FLAG_RSF: Registers Synchronized flag. This flag

*                         is cleared only after an APB reset or an APB Clock stop.

*                       - RTC_FLAG_OW: Overflow flag

*                       - RTC_FLAG_ALR: Alarm flag

*                       - RTC_FLAG_SEC: Second flag

* Output         : None

* Return         : None

*******************************************************************************/

void RTC_ClearFlag(u16 RTC_FLAG)

{

  /* Check the parameters */

  assert(IS_RTC_CLEAR_FLAG(RTC_FLAG));

  /* Clear the coressponding RTC flag */

  RTC->CRL &= (u16)~RTC_FLAG;

}

/*******************************************************************************

* Function Name  : RTC_GetITStatus

* Description    : Checks whether the specified RTC interrupt has occured or not.

* Input          : - RTC_IT: specifies the RTC interrupts sources to check.

*                    This parameter can be one of the following values:

*                       - RTC_IT_OW: Overflow interrupt

*                       - RTC_IT_ALR: Alarm interrupt

*                       - RTC_IT_SEC: Second interrupt

* Output         : None

* Return         : The new state of the RTC_IT (SET or RESET).

*******************************************************************************/

ITStatus RTC_GetITStatus(u16 RTC_IT)

{

  ITStatus bitstatus = RESET;

  /* Check the parameters */

  assert(IS_RTC_GET_IT(RTC_IT));

  bitstatus = (ITStatus)((RTC->CRL & RTC_IT) != (u16)RESET);

  if (((RTC->CRH & RTC_IT) != (u16)RESET) && bitstatus)

  {

    bitstatus = SET;

  }

  else

  {

    bitstatus = RESET;

  }

  return bitstatus;

}

/*******************************************************************************

* Function Name  : RTC_ClearITPendingBit

* Description    : Clears the RTC’s interrupt pending bits.

* Input          : - RTC_IT: specifies the interrupt pending bit to clear.

*                    This parameter can be any combination of the following values:

*                       - RTC_IT_OW: Overflow interrupt

*                       - RTC_IT_ALR: Alarm interrupt

*                       - RTC_IT_SEC: Second interrupt

* Output         : None

* Return         : None

*******************************************************************************/

void RTC_ClearITPendingBit(u16 RTC_IT)

{

  /* Check the parameters */

  assert(IS_RTC_IT(RTC_IT));

  /* Clear the coressponding RTC pending bit */

  RTC->CRL &= (u16)~RTC_IT;

}

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