140 lines
3.9 KiB
C
140 lines
3.9 KiB
C
/********************************** (C) COPYRIGHT *******************************
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* File Name : ch32v30x_wwdg.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 WWDG firmware functions.
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* Copyright (c) 2021 Nanjing Qinheng Microelectronics Co., Ltd.
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* SPDX-License-Identifier: Apache-2.0
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**********************************************************************************/
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#include "ch32v30x_wwdg.h"
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#include "ch32v30x_rcc.h"
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/* CTLR register bit mask */
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#define CTLR_WDGA_Set ((uint32_t)0x00000080)
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/* CFGR register bit mask */
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#define CFGR_WDGTB_Mask ((uint32_t)0xFFFFFE7F)
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#define CFGR_W_Mask ((uint32_t)0xFFFFFF80)
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#define BIT_Mask ((uint8_t)0x7F)
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/*********************************************************************
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* @fn WWDG_DeInit
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*
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* @brief Deinitializes the WWDG peripheral registers to their default reset values
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*
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* @return none
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*/
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void WWDG_DeInit(void)
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{
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RCC_APB1PeriphResetCmd(RCC_APB1Periph_WWDG, ENABLE);
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RCC_APB1PeriphResetCmd(RCC_APB1Periph_WWDG, DISABLE);
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}
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/*********************************************************************
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* @fn WWDG_SetPrescaler
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*
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* @brief Sets the WWDG Prescaler
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*
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* @param WWDG_Prescaler - specifies the WWDG Prescaler
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* WWDG_Prescaler_1 - WWDG counter clock = (PCLK1/4096)/1
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* WWDG_Prescaler_2 - WWDG counter clock = (PCLK1/4096)/2
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* WWDG_Prescaler_4 - WWDG counter clock = (PCLK1/4096)/4
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* WWDG_Prescaler_8 - WWDG counter clock = (PCLK1/4096)/8
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*
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* @return none
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*/
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void WWDG_SetPrescaler(uint32_t WWDG_Prescaler)
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{
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uint32_t tmpreg = 0;
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tmpreg = WWDG->CFGR & CFGR_WDGTB_Mask;
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tmpreg |= WWDG_Prescaler;
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WWDG->CFGR = tmpreg;
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}
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/*********************************************************************
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* @fn WWDG_SetWindowValue
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*
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* @brief Sets the WWDG window value
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*
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* @param WindowValue - specifies the window value to be compared to the
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* downcounter,which must be lower than 0x80
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*
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* @return none
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*/
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void WWDG_SetWindowValue(uint8_t WindowValue)
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{
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__IO uint32_t tmpreg = 0;
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tmpreg = WWDG->CFGR & CFGR_W_Mask;
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tmpreg |= WindowValue & (uint32_t)BIT_Mask;
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WWDG->CFGR = tmpreg;
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}
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/*********************************************************************
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* @fn WWDG_EnableIT
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*
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* @brief Enables the WWDG Early Wakeup interrupt(EWI)
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*
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* @return none
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*/
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void WWDG_EnableIT(void)
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{
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WWDG->CFGR |= (1 << 9);
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}
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/*********************************************************************
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* @fn WWDG_SetCounter
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*
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* @brief Sets the WWDG counter value
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*
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* @param Counter - specifies the watchdog counter value,which must be a
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* number between 0x40 and 0x7F
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*
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* @return none
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*/
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void WWDG_SetCounter(uint8_t Counter)
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{
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WWDG->CTLR = Counter & BIT_Mask;
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}
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/*********************************************************************
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* @fn WWDG_Enable
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*
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* @brief Enables WWDG and load the counter value
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*
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* @param Counter - specifies the watchdog counter value,which must be a
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* number between 0x40 and 0x7F
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* @return none
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*/
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void WWDG_Enable(uint8_t Counter)
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{
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WWDG->CTLR = CTLR_WDGA_Set | Counter;
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}
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/*********************************************************************
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* @fn WWDG_GetFlagStatus
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*
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* @brief Checks whether the Early Wakeup interrupt flag is set or not
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*
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* @return The new state of the Early Wakeup interrupt flag (SET or RESET)
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*/
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FlagStatus WWDG_GetFlagStatus(void)
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{
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return (FlagStatus)(WWDG->STATR);
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}
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/*********************************************************************
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* @fn WWDG_ClearFlag
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*
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* @brief Clears Early Wakeup interrupt flag
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*
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* @return none
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*/
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void WWDG_ClearFlag(void)
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{
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WWDG->STATR = (uint32_t)RESET;
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}
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