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/********************************** (C) COPYRIGHT *******************************
* File Name : ch32v10x_rtc.c
* Author : WCH
* Version : V1.0.0
* Date : 2020/04/30
* Description : This file provides all the RTC firmware functions.
* Copyright (c) 2021 Nanjing Qinheng Microelectronics Co., Ltd.
* SPDX-License-Identifier: Apache-2.0
********************************************************************************/
#include "ch32v10x_rtc.h"
/* RTC_Private_Defines */
#define RTC_LSB_MASK ((uint32_t)0x0000FFFF) /* RTC LSB Mask */
#define PRLH_MSB_MASK ((uint32_t)0x000F0000) /* RTC Prescaler MSB Mask */
/*********************************************************************
* @fn RTC_ITConfig
*
* @brief Enables or disables the specified RTC interrupts.
*
* @param RTC_IT - specifies the RTC interrupts sources to be enabled or disabled.
* RTC_IT_OW - Overflow interrupt
* RTC_IT_ALR - Alarm interrupt
* RTC_IT_SEC - Second interrupt
*
* @return NewState - new state of the specified RTC interrupts(ENABLE or DISABLE).
*/
void RTC_ITConfig(uint16_t RTC_IT, FunctionalState NewState)
{
if(NewState != DISABLE)
{
RTC->CTLRH |= RTC_IT;
}
else
{
RTC->CTLRH &= (uint16_t)~RTC_IT;
}
}
/*********************************************************************
* @fn RTC_EnterConfigMode
*
* @brief Enters the RTC configuration mode.
*
* @return none
*/
void RTC_EnterConfigMode(void)
{
RTC->CTLRL |= RTC_CTLRL_CNF;
}
/*********************************************************************
* @fn RTC_ExitConfigMode
*
* @brief Exits from the RTC configuration mode.
*
* @return none
*/
void RTC_ExitConfigMode(void)
{
RTC->CTLRL &= (uint16_t) ~((uint16_t)RTC_CTLRL_CNF);
}
/*********************************************************************
* @fn RTC_GetCounter
*
* @brief Gets the RTC counter value
*
* @return RTC counter value
*/
uint32_t RTC_GetCounter(void)
{
uint16_t high1 = 0, high2 = 0, low = 0;
high1 = RTC->CNTH;
low = RTC->CNTL;
high2 = RTC->CNTH;
if(high1 != high2)
{
return (((uint32_t)high2 << 16) | RTC->CNTL);
}
else
{
return (((uint32_t)high1 << 16) | low);
}
}
/*********************************************************************
* @fn RTC_SetCounter
*
* @brief Sets the RTC counter value.
*
* @param CounterValue - RTC counter new value.
*
* @return RTC counter value
*/
void RTC_SetCounter(uint32_t CounterValue)
{
RTC_EnterConfigMode();
RTC->CNTH = CounterValue >> 16;
RTC->CNTL = (CounterValue & RTC_LSB_MASK);
RTC_ExitConfigMode();
}
/*********************************************************************
* @fn RTC_SetPrescaler
*
* @brief Sets the RTC prescaler value
*
* @param PrescalerValue - RTC prescaler new value
*
* @return none
*/
void RTC_SetPrescaler(uint32_t PrescalerValue)
{
RTC_EnterConfigMode();
RTC->PSCRH = (PrescalerValue & PRLH_MSB_MASK) >> 16;
RTC->PSCRL = (PrescalerValue & RTC_LSB_MASK);
RTC_ExitConfigMode();
}
/*********************************************************************
* @fn RTC_SetAlarm
*
* @brief Sets the RTC alarm value
*
* @param AlarmValue - RTC alarm new value
*
* @return none
*/
void RTC_SetAlarm(uint32_t AlarmValue)
{
RTC_EnterConfigMode();
RTC->ALRMH = AlarmValue >> 16;
RTC->ALRML = (AlarmValue & RTC_LSB_MASK);
RTC_ExitConfigMode();
}
/*********************************************************************
* @fn RTC_GetDivider
*
* @brief Gets the RTC divider value
*
* @return RTC Divider value
*/
uint32_t RTC_GetDivider(void)
{
uint32_t tmp = 0x00;
tmp = ((uint32_t)RTC->DIVH & (uint32_t)0x000F) << 16;
tmp |= RTC->DIVL;
return tmp;
}
/*********************************************************************
* @fn RTC_WaitForLastTask
*
* @brief Waits until last write operation on RTC registers has finished
*
* @return none
*/
void RTC_WaitForLastTask(void)
{
while((RTC->CTLRL & RTC_FLAG_RTOFF) == (uint16_t)RESET)
{
}
}
/*********************************************************************
* @fn RTC_WaitForSynchro
*
* @brief Waits until the RTC registers are synchronized with RTC APB clock
*
* @return none
*/
void RTC_WaitForSynchro(void)
{
RTC->CTLRL &= (uint16_t)~RTC_FLAG_RSF;
while((RTC->CTLRL & RTC_FLAG_RSF) == (uint16_t)RESET)
{
}
}
/*********************************************************************
* @fn RTC_GetFlagStatus
*
* @brief Checks whether the specified RTC flag is set or not
*
* @param RTC_FLAG- specifies the flag to check
* 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
*
* @return The new state of RTC_FLAG (SET or RESET)
*/
FlagStatus RTC_GetFlagStatus(uint16_t RTC_FLAG)
{
FlagStatus bitstatus = RESET;
if((RTC->CTLRL & RTC_FLAG) != (uint16_t)RESET)
{
bitstatus = SET;
}
else
{
bitstatus = RESET;
}
return bitstatus;
}
/*********************************************************************
* @fn RTC_ClearFlag
*
* @brief Clears the RTC's pending flags
*
* @param RTC_FLAG - specifies the flag to clear
* RTC_FLAG_RSF - Registers Synchronized flag
* RTC_FLAG_OW - Overflow flag
* RTC_FLAG_ALR - Alarm flag
* RTC_FLAG_SEC - Second flag
*
* @return none
*/
void RTC_ClearFlag(uint16_t RTC_FLAG)
{
RTC->CTLRL &= (uint16_t)~RTC_FLAG;
}
/*********************************************************************
* @fn RTC_GetITStatus
*
* @brief Checks whether the specified RTC interrupt has occurred or not
*
* @param RTC_IT - specifies the RTC interrupts sources to check
* RTC_FLAG_OW - Overflow interrupt
* RTC_FLAG_ALR - Alarm interrupt
* RTC_FLAG_SEC - Second interrupt
*
* @return The new state of the RTC_IT (SET or RESET)
*/
ITStatus RTC_GetITStatus(uint16_t RTC_IT)
{
ITStatus bitstatus = RESET;
bitstatus = (ITStatus)(RTC->CTLRL & RTC_IT);
if(((RTC->CTLRH & RTC_IT) != (uint16_t)RESET) && (bitstatus != (uint16_t)RESET))
{
bitstatus = SET;
}
else
{
bitstatus = RESET;
}
return bitstatus;
}
/*********************************************************************
* @fn RTC_ClearITPendingBit
*
* @brief Clears the RTC's interrupt pending bits
*
* @param RTC_IT - specifies the interrupt pending bit to clear
* RTC_FLAG_OW - Overflow interrupt
* RTC_FLAG_ALR - Alarm interrupt
* RTC_FLAG_SEC - Second interrupt
*
* @return none
*/
void RTC_ClearITPendingBit(uint16_t RTC_IT)
{
RTC->CTLRL &= (uint16_t)~RTC_IT;
}
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