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/********************************** (C) COPYRIGHT *******************************
* File Name : ch32f20x_bkp.c
* Author : WCH
* Version : V1.0.0
* Date : 2021/08/08
* Description : This file provides all the BKP firmware functions.
*******************************************************************************/
#include "ch32f20x_bkp.h"
#include "ch32f20x_rcc.h"
/* BKP registers bit mask */
/* OCTLR register bit mask */
#define OCTLR_CAL_MASK ((uint16_t)0xFF80)
#define OCTLR_MASK ((uint16_t)0xFC7F)
/*******************************************************************************
* Function Name : BKP_DeInit
* Description : Deinitializes the BKP peripheral registers to their default
* reset values.
* Input : None
* Return : None
*******************************************************************************/
void BKP_DeInit(void)
{
RCC_BackupResetCmd(ENABLE);
RCC_BackupResetCmd(DISABLE);
}
/*******************************************************************************
* Function Name : BKP_TamperPinLevelConfig
* Description : Configures the Tamper Pin active level.
* Input : BKP_TamperPinLevel: specifies the Tamper Pin active level.
* BKP_TamperPinLevel_High: Tamper pin active on high level.
* BKP_TamperPinLevel_Low: Tamper pin active on low level.
* Return : None
*******************************************************************************/
void BKP_TamperPinLevelConfig(uint16_t BKP_TamperPinLevel)
{
if(BKP_TamperPinLevel)
{
BKP->TPCTLR |= ((uint32_t)1<<1);
}
else
{
BKP->TPCTLR &= ~((uint32_t)1<<1);
}
}
/*******************************************************************************
* Function Name : BKP_TamperPinCmd
* Description : Enables or disables the Tamper Pin activation.
* Input : NewState: ENABLE or DISABLE.
* Return : None
*******************************************************************************/
void BKP_TamperPinCmd(FunctionalState NewState)
{
if(NewState)
{
BKP->TPCTLR |= ((uint32_t)1<<0);
}
else
{
BKP->TPCTLR &= ~((uint32_t)1<<0);
}
}
/*******************************************************************************
* Function Name : BKP_ITConfig
* Description : Enables or disables the Tamper Pin Interrupt.
* Input : NewState: ENABLE or DISABLE.
* Return : None
*******************************************************************************/
void BKP_ITConfig(FunctionalState NewState)
{
if(NewState)
{
BKP->TPCSR |= ((uint32_t)1<<2);
}
else
{
BKP->TPCSR &= ~((uint32_t)1<<2);
}
}
/*******************************************************************************
* Function Name : BKP_RTCOutputConfig
* Description : Select the RTC output source to output on the Tamper pin.
* Input : BKP_RTCOutputSource: specifies the RTC output source.
* BKP_RTCOutputSource_None: no RTC output on the Tamper pin.
* BKP_RTCOutputSource_CalibClock: output the RTC clock with
* frequency divided by 64 on the Tamper pin.
* BKP_RTCOutputSource_Alarm: output the RTC Alarm pulse signal
* on the Tamper pin.
* BKP_RTCOutputSource_Second: output the RTC Second pulse
* signal on the Tamper pin.
* Return : None
*******************************************************************************/
void BKP_RTCOutputConfig(uint16_t BKP_RTCOutputSource)
{
uint16_t tmpreg = 0;
tmpreg = BKP->OCTLR;
tmpreg &= OCTLR_MASK;
tmpreg |= BKP_RTCOutputSource;
BKP->OCTLR = tmpreg;
}
/*******************************************************************************
* Function Name : BKP_SetRTCCalibrationValue
* Description : Sets RTC Clock Calibration value.
* Input : CalibrationValue: specifies the RTC Clock Calibration value.
* This parameter must be a number between 0 and 0x1F.
* Return : None
*******************************************************************************/
void BKP_SetRTCCalibrationValue(uint8_t CalibrationValue)
{
uint16_t tmpreg = 0;
tmpreg = BKP->OCTLR;
tmpreg &= OCTLR_CAL_MASK;
tmpreg |= CalibrationValue;
BKP->OCTLR = tmpreg;
}
/*******************************************************************************
* Function Name : BKP_WriteBackupRegister
* Description : Writes user data to the specified Data Backup Register.
* Input : BKP_DR: specifies the Data Backup Register.
* Data: data to write.
* Return : None
*******************************************************************************/
void BKP_WriteBackupRegister(uint16_t BKP_DR, uint16_t Data)
{
__IO uint32_t tmp = 0;
tmp = (uint32_t)BKP_BASE;
tmp += BKP_DR;
*(__IO uint32_t *) tmp = Data;
}
/*******************************************************************************
* Function Name : BKP_ReadBackupRegister
* Description : Reads data from the specified Data Backup Register.
* Input : BKP_DR: specifies the Data Backup Register.
* This parameter can be BKP_DRx where x:[1, 42].
* Return : None
*******************************************************************************/
uint16_t BKP_ReadBackupRegister(uint16_t BKP_DR)
{
__IO uint32_t tmp = 0;
tmp = (uint32_t)BKP_BASE;
tmp += BKP_DR;
return (*(__IO uint16_t *) tmp);
}
/*******************************************************************************
* Function Name : BKP_GetFlagStatus
* Description : Checks whether the Tamper Pin Event flag is set or not.
* Input : None
* Return : FlagStatus: SET or RESET.
*******************************************************************************/
FlagStatus BKP_GetFlagStatus(void)
{
if(BKP->TPCSR & (1<<8))
{
return SET;
}
else
{
return RESET;
}
}
/*******************************************************************************
* Function Name : BKP_ClearFlag
* Description : Clears Tamper Pin Event pending flag.
* Input : None
* Return : None
*******************************************************************************/
void BKP_ClearFlag(void)
{
BKP->TPCSR |= BKP_CTE;
}
/*******************************************************************************
* Function Name : BKP_GetITStatus
* Description : Checks whether the Tamper Pin Interrupt has occurred or not.
* Input : None
* Return : ITStatus: SET or RESET.
*******************************************************************************/
ITStatus BKP_GetITStatus(void)
{
if(BKP->TPCSR & ((uint32_t)1<<9))
{
return SET;
}
else
{
return RESET;
}
}
/*******************************************************************************
* Function Name : BKP_ClearITPendingBit
* Description : Clears Tamper Pin Interrupt pending bit.
* Input : None
* Return : None
*******************************************************************************/
void BKP_ClearITPendingBit(void)
{
BKP->TPCSR |= BKP_CTI;
}
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