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/********************************** (C) COPYRIGHT *******************************
* File Name : ch32f20x_wwdg.c
* Author : WCH
* Version : V1.0.0
* Date : 2021/08/08
* Description : This file provides all the WWDG firmware functions.
**********************************************************************************/
#include "ch32f20x_wwdg.h"
#include "ch32f20x_rcc.h"
/* CTLR register bit mask */
#define CTLR_WDGA_Set ((uint32_t)0x00000080)
/* CFGR register bit mask */
#define CFGR_WDGTB_Mask ((uint32_t)0xFFFFFE7F)
#define CFGR_W_Mask ((uint32_t)0xFFFFFF80)
#define BIT_Mask ((uint8_t)0x7F)
/********************************************************************************
* Function Name : WWDG_DeInit
* Description : Deinitializes the WWDG peripheral registers to their default reset values
* Input : None
* Return : None
*********************************************************************************/
void WWDG_DeInit(void)
{
RCC_APB1PeriphResetCmd(RCC_APB1Periph_WWDG, ENABLE);
RCC_APB1PeriphResetCmd(RCC_APB1Periph_WWDG, DISABLE);
}
/********************************************************************************
* Function Name : WWDG_SetPrescaler
* Description : Sets the WWDG Prescaler
* Input : WWDG_Prescaler: specifies the WWDG Prescaler
* WWDG_Prescaler_1: WWDG counter clock = (PCLK1/4096)/1
* WWDG_Prescaler_2: WWDG counter clock = (PCLK1/4096)/2
* WWDG_Prescaler_4: WWDG counter clock = (PCLK1/4096)/4
* WWDG_Prescaler_8: WWDG counter clock = (PCLK1/4096)/8
* Return : None
*********************************************************************************/
void WWDG_SetPrescaler(uint32_t WWDG_Prescaler)
{
uint32_t tmpreg = 0;
tmpreg = WWDG->CFGR & CFGR_WDGTB_Mask;
tmpreg |= WWDG_Prescaler;
WWDG->CFGR = tmpreg;
}
/********************************************************************************
* Function Name : WWDG_SetWindowValue
* Description : Sets the WWDG window value
* Input : WindowValue: specifies the window value to be compared to the
* downcounter,which must be lower than 0x80
* Return : None
*********************************************************************************/
void WWDG_SetWindowValue(uint8_t WindowValue)
{
__IO uint32_t tmpreg = 0;
tmpreg = WWDG->CFGR & CFGR_W_Mask;
tmpreg |= WindowValue & (uint32_t) BIT_Mask;
WWDG->CFGR = tmpreg;
}
/********************************************************************************
* Function Name : WWDG_EnableIT
* Description : Enables the WWDG Early Wakeup interrupt(EWI)
* Input : None
* Return : None
*********************************************************************************/
void WWDG_EnableIT(void)
{
WWDG->CFGR |= (1<<9);
}
/********************************************************************************
* Function Name : WWDG_SetCounter
* Description : Sets the WWDG counter value
* Input : Counter: specifies the watchdog counter value,which must be a
* number between 0x40 and 0x7F
* Return : None
*********************************************************************************/
void WWDG_SetCounter(uint8_t Counter)
{
WWDG->CTLR = Counter & BIT_Mask;
}
/********************************************************************************
* Function Name : WWDG_Enable
* Description : Enables WWDG and load the counter value
* Input : Counter: specifies the watchdog counter value,which must be a
* number between 0x40 and 0x7F
* Return : None
*********************************************************************************/
void WWDG_Enable(uint8_t Counter)
{
WWDG->CTLR = CTLR_WDGA_Set | Counter;
}
/********************************************************************************
* Function Name : WWDG_GetFlagStatus
* Description : Checks whether the Early Wakeup interrupt flag is set or not
* Input : None
* Return : The new state of the Early Wakeup interrupt flag (SET or RESET)
*********************************************************************************/
FlagStatus WWDG_GetFlagStatus(void)
{
return (FlagStatus)(WWDG->STATR);
}
/********************************************************************************
* Function Name : WWDG_ClearFlag
* Description : Clears Early Wakeup interrupt flag
* Input : None
* Return : None
*********************************************************************************/
void WWDG_ClearFlag(void)
{
WWDG->STATR = (uint32_t)RESET;
}
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