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/******************** (C) COPYRIGHT 2008 STMicroelectronics ********************
* File Name : stm32f10x_rtc.c
* Author : MCD Application Team
* Version : V2.0.2
* Date : 07/11/2008
* Description : This file provides all the RTC firmware functions.
********************************************************************************
* THE PRESENT FIRMWARE 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 FIRMWARE 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 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_param(IS_RTC_IT(RTC_IT));
assert_param(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 >> 16;
/* Set RTC COUNTER LSB word */
RTC->CNTL = (CounterValue & RTC_LSB_Mask);
RTC_ExitConfigMode();
}
/*******************************************************************************
* 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_param(IS_RTC_PRESCALER(PrescalerValue));
RTC_EnterConfigMode();
/* Set RTC PRESCALER MSB word */
RTC->PRLH = (PrescalerValue & PRLH_MSB_Mask) >> 16;
/* 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 >> 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) << 16;
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_param(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_param(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_param(IS_RTC_GET_IT(RTC_IT));
bitstatus = (ITStatus)(RTC->CRL & RTC_IT);
if (((RTC->CRH & RTC_IT) != (u16)RESET) && (bitstatus != (u16)RESET))
{
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_param(IS_RTC_IT(RTC_IT));
/* Clear the coressponding RTC pending bit */
RTC->CRL &= (u16)~RTC_IT;
}
/******************* (C) COPYRIGHT 2008 STMicroelectronics *****END OF FILE****/
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