316 lines
8.4 KiB
C
316 lines
8.4 KiB
C
/********************************** (C) COPYRIGHT *******************************
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* File Name : ch32v30x_rtc.c
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* Author : WCH
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* Version : V1.0.0
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* Date : 2021/06/06
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* Description : This file provides all the RTC firmware functions.
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*********************************************************************************
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* Copyright (c) 2021 Nanjing Qinheng Microelectronics Co., Ltd.
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* Attention: This software (modified or not) and binary are used for
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* microcontroller manufactured by Nanjing Qinheng Microelectronics.
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*******************************************************************************/
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#include "ch32v30x_rtc.h"
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/* RTC_Private_Defines */
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#define RTC_LSB_MASK ((uint32_t)0x0000FFFF) /* RTC LSB Mask */
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#define PRLH_MSB_MASK ((uint32_t)0x000F0000) /* RTC Prescaler MSB Mask */
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/*********************************************************************
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* @fn RTC_ITConfig
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*
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* @brief Enables or disables the specified RTC interrupts.
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*
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* @param RTC_IT - specifies the RTC interrupts sources to be enabled or disabled.
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* RTC_IT_OW - Overflow interrupt
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* RTC_IT_ALR - Alarm interrupt
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* RTC_IT_SEC - Second interrupt
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*
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* @return NewState - new state of the specified RTC interrupts(ENABLE or DISABLE).
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*/
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void RTC_ITConfig(uint16_t RTC_IT, FunctionalState NewState)
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{
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if(NewState != DISABLE)
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{
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RTC->CTLRH |= RTC_IT;
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}
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else
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{
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RTC->CTLRH &= (uint16_t)~RTC_IT;
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}
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}
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/*********************************************************************
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* @fn RTC_EnterConfigMode
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*
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* @brief Enters the RTC configuration mode.
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*
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* @return none
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*/
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void RTC_EnterConfigMode(void)
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{
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RTC->CTLRL |= RTC_CTLRL_CNF;
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}
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/*********************************************************************
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* @fn RTC_ExitConfigMode
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*
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* @brief Exits from the RTC configuration mode.
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*
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* @return none
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*/
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void RTC_ExitConfigMode(void)
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{
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RTC->CTLRL &= (uint16_t) ~((uint16_t)RTC_CTLRL_CNF);
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}
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/*********************************************************************
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* @fn RTC_GetCounter
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*
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* @brief Gets the RTC counter value
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*
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* @return RTC counter value
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*/
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uint32_t RTC_GetCounter(void)
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{
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uint16_t high1a = 0, high1b = 0, high2a = 0, high2b = 0;
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uint16_t low1 = 0, low2 = 0;
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do{
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high1a = RTC->CNTH;
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high1b = RTC->CNTH;
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}while( high1a != high1b );
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do{
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low1 = RTC->CNTL;
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low2 = RTC->CNTL;
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}while( low1 != low2 );
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do{
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high2a = RTC->CNTH;
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high2b = RTC->CNTH;
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}while( high2a != high2b );
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if(high1b != high2b)
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{
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do{
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low1 = RTC->CNTL;
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low2 = RTC->CNTL;
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}while( low1 != low2 );
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}
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return (((uint32_t)high2b << 16) | low2);
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}
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/*********************************************************************
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* @fn RTC_SetCounter
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*
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* @brief Sets the RTC counter value.
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*
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* @param CounterValue - RTC counter new value.
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*
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* @return RTC counter value
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*/
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void RTC_SetCounter(uint32_t CounterValue)
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{
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RTC_EnterConfigMode();
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RTC->CNTH = CounterValue >> 16;
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RTC->CNTL = (CounterValue & RTC_LSB_MASK);
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RTC_ExitConfigMode();
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}
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/*********************************************************************
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* @fn RTC_SetPrescaler
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*
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* @brief Sets the RTC prescaler value
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*
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* @param PrescalerValue - RTC prescaler new value
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*
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* @return none
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*/
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void RTC_SetPrescaler(uint32_t PrescalerValue)
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{
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RTC_EnterConfigMode();
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RTC->PSCRH = (PrescalerValue & PRLH_MSB_MASK) >> 16;
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RTC->PSCRL = (PrescalerValue & RTC_LSB_MASK);
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RTC_ExitConfigMode();
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}
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/*********************************************************************
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* @fn RTC_SetAlarm
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*
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* @brief Sets the RTC alarm value
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*
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* @param AlarmValue - RTC alarm new value
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*
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* @return none
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*/
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void RTC_SetAlarm(uint32_t AlarmValue)
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{
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RTC_EnterConfigMode();
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RTC->ALRMH = AlarmValue >> 16;
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RTC->ALRML = (AlarmValue & RTC_LSB_MASK);
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RTC_ExitConfigMode();
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}
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/*********************************************************************
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* @fn RTC_GetDivider
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*
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* @brief Gets the RTC divider value
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*
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* @return RTC Divider value
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*/
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uint32_t RTC_GetDivider(void)
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{
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uint16_t high1a = 0, high1b = 0, high2a = 0, high2b = 0;
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uint16_t low1 = 0, low2 = 0;
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do{
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high1a = RTC->DIVH;
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high1b = RTC->DIVH;
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}while( high1a != high1b );
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do{
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low1 = RTC->DIVL;
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low2 = RTC->DIVL;
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}while( low1 != low2 );
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do{
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high2a = RTC->DIVH;
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high2b = RTC->DIVH;
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}while( high2a != high2b );
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if(high1b != high2b)
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{
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do{
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low1 = RTC->DIVL;
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low2 = RTC->DIVL;
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}while( low1 != low2 );
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}
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return ((((uint32_t)high2b & (uint32_t)0x000F) << 16) | low2);
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}
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/*********************************************************************
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* @fn RTC_WaitForLastTask
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*
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* @brief Waits until last write operation on RTC registers has finished
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* Note-
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* This function must be called before any write to RTC registers.
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* @return none
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*/
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void RTC_WaitForLastTask(void)
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{
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while((RTC->CTLRL & RTC_FLAG_RTOFF) == (uint16_t)RESET)
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{
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}
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}
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/*********************************************************************
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* @fn RTC_WaitForSynchro
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*
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* @brief Waits until the RTC registers are synchronized with RTC APB clock
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* Note-
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* This function must be called before any read operation after an APB reset
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* or an APB clock stop.
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*
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* @return none
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*/
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void RTC_WaitForSynchro(void)
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{
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RTC->CTLRL &= (uint16_t)~RTC_FLAG_RSF;
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while((RTC->CTLRL & RTC_FLAG_RSF) == (uint16_t)RESET)
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{
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}
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}
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/*********************************************************************
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* @fn RTC_GetFlagStatus
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*
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* @brief Checks whether the specified RTC flag is set or not
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*
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* @param RTC_FLAG- specifies the flag to check
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* RTC_FLAG_RTOFF - RTC Operation OFF flag
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* RTC_FLAG_RSF - Registers Synchronized flag
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* RTC_FLAG_OW - Overflow flag
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* RTC_FLAG_ALR - Alarm flag
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* RTC_FLAG_SEC - Second flag
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*
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* @return The new state of RTC_FLAG (SET or RESET)
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*/
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FlagStatus RTC_GetFlagStatus(uint16_t RTC_FLAG)
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{
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FlagStatus bitstatus = RESET;
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if((RTC->CTLRL & RTC_FLAG) != (uint16_t)RESET)
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{
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bitstatus = SET;
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}
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else
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{
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bitstatus = RESET;
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}
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return bitstatus;
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}
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/*********************************************************************
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* @fn RTC_ClearFlag
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*
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* @brief Clears the RTC's pending flags
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*
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* @param RTC_FLAG - specifies the flag to clear
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* RTC_FLAG_RSF - Registers Synchronized flag
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* RTC_FLAG_OW - Overflow flag
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* RTC_FLAG_ALR - Alarm flag
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* RTC_FLAG_SEC - Second flag
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*
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* @return none
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*/
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void RTC_ClearFlag(uint16_t RTC_FLAG)
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{
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RTC->CTLRL &= (uint16_t)~RTC_FLAG;
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}
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/*********************************************************************
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* @fn RTC_GetITStatus
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*
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* @brief Checks whether the specified RTC interrupt has occurred or not
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*
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* @param RTC_IT - specifies the RTC interrupts sources to check
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* RTC_FLAG_OW - Overflow interrupt
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* RTC_FLAG_ALR - Alarm interrupt
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* RTC_FLAG_SEC - Second interrupt
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*
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* @return The new state of the RTC_IT (SET or RESET)
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*/
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ITStatus RTC_GetITStatus(uint16_t RTC_IT)
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{
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ITStatus bitstatus = RESET;
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bitstatus = (ITStatus)(RTC->CTLRL & RTC_IT);
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if(((RTC->CTLRH & RTC_IT) != (uint16_t)RESET) && (bitstatus != (uint16_t)RESET))
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{
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bitstatus = SET;
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}
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else
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{
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bitstatus = RESET;
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}
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return bitstatus;
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}
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/*********************************************************************
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* @fn RTC_ClearITPendingBit
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*
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* @brief Clears the RTC's interrupt pending bits
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*
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* @param RTC_IT - specifies the interrupt pending bit to clear
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* RTC_FLAG_OW - Overflow interrupt
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* RTC_FLAG_ALR - Alarm interrupt
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* RTC_FLAG_SEC - Second interrupt
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*
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* @return none
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*/
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void RTC_ClearITPendingBit(uint16_t RTC_IT)
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{
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RTC->CTLRL &= (uint16_t)~RTC_IT;
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}
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