121 lines
3.6 KiB
C
121 lines
3.6 KiB
C
/********************************** (C) COPYRIGHT *******************************
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* File Name : ch32v30x_iwdg.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 IWDG 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_iwdg.h"
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/* CTLR register bit mask */
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#define CTLR_KEY_Reload ((uint16_t)0xAAAA)
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#define CTLR_KEY_Enable ((uint16_t)0xCCCC)
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/*********************************************************************
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* @fn IWDG_WriteAccessCmd
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*
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* @brief Enables or disables write access to IWDG_PSCR and IWDG_RLDR registers.
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*
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* @param WDG_WriteAccess - new state of write access to IWDG_PSCR and
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* IWDG_RLDR registers.
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* IWDG_WriteAccess_Enable - Enable write access to IWDG_PSCR and
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* IWDG_RLDR registers.
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* IWDG_WriteAccess_Disable - Disable write access to IWDG_PSCR
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* and IWDG_RLDR registers.
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*
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* @return none
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*/
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void IWDG_WriteAccessCmd(uint16_t IWDG_WriteAccess)
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{
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IWDG->CTLR = IWDG_WriteAccess;
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}
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/*********************************************************************
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* @fn IWDG_SetPrescaler
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*
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* @brief Sets IWDG Prescaler value.
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*
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* @param IWDG_Prescaler - specifies the IWDG Prescaler value.
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* IWDG_Prescaler_4 - IWDG prescaler set to 4.
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* IWDG_Prescaler_8 - IWDG prescaler set to 8.
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* IWDG_Prescaler_16 - IWDG prescaler set to 16.
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* IWDG_Prescaler_32 - IWDG prescaler set to 32.
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* IWDG_Prescaler_64 - IWDG prescaler set to 64.
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* IWDG_Prescaler_128 - IWDG prescaler set to 128.
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* IWDG_Prescaler_256 - IWDG prescaler set to 256.
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*
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* @return none
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*/
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void IWDG_SetPrescaler(uint8_t IWDG_Prescaler)
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{
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IWDG->PSCR = IWDG_Prescaler;
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}
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/*********************************************************************
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* @fn IWDG_SetReload
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*
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* @brief Sets IWDG Reload value.
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*
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* @param Reload - specifies the IWDG Reload value.
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* This parameter must be a number between 0 and 0x0FFF.
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*
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* @return none
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*/
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void IWDG_SetReload(uint16_t Reload)
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{
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IWDG->RLDR = Reload;
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}
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/*********************************************************************
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* @fn IWDG_ReloadCounter
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*
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* @brief Reloads IWDG counter with value defined in the reload register.
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*
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* @return none
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*/
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void IWDG_ReloadCounter(void)
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{
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IWDG->CTLR = CTLR_KEY_Reload;
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}
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/*********************************************************************
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* @fn IWDG_Enable
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*
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* @brief Enables IWDG (write access to IWDG_PSCR and IWDG_RLDR registers disabled).
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*
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* @return none
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*/
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void IWDG_Enable(void)
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{
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IWDG->CTLR = CTLR_KEY_Enable;
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}
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/*********************************************************************
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* @fn IWDG_GetFlagStatus
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*
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* @brief Checks whether the specified IWDG flag is set or not.
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*
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* @param IWDG_FLAG - specifies the flag to check.
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* IWDG_FLAG_PVU - Prescaler Value Update on going.
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* IWDG_FLAG_RVU - Reload Value Update on going.
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*
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* @return none
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*/
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FlagStatus IWDG_GetFlagStatus(uint16_t IWDG_FLAG)
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{
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FlagStatus bitstatus = RESET;
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if((IWDG->STATR & IWDG_FLAG) != (uint32_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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