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/***************COPYRIGHT(C) 2019 WCH. A11 rights reserved*********************
* File Name : ch32f10x_iwdg.c
* Author : WCH
* Version : V1.0.0
* Date : 2019/10/15
* Description : This file provides all the IWDG firmware functions.
*******************************************************************************/
#include "ch32f10x_iwdg.h"
/* CTLR register bit mask */
#define CTLR_KEY_Reload ((uint16_t)0xAAAA)
#define CTLR_KEY_Enable ((uint16_t)0xCCCC)
/*******************************************************************************
* Function Name : IWDG_WriteAccessCmd
* Description : Enables or disables write access to IWDG_PR and IWDG_RLR registers.
* Input : WDG_WriteAccess: new state of write access to IWDG_PR and
* IWDG_RLR registers.
* IWDG_WriteAccess_Enable: Enable write access to IWDG_PR and
* IWDG_RLR registers.
* IWDG_WriteAccess_Disable: Disable write access to IWDG_PR
* and IWDG_RLR registers.
* Return : None
*******************************************************************************/
void IWDG_WriteAccessCmd(uint16_t IWDG_WriteAccess)
{
IWDG->CTLR = IWDG_WriteAccess;
}
/*******************************************************************************
* Function Name : IWDG_SetPrescaler
* Description : Sets IWDG Prescaler value.
* Input : IWDG_Prescaler: specifies the IWDG Prescaler value.
* IWDG_Prescaler_4: IWDG prescaler set to 4.
* IWDG_Prescaler_8: IWDG prescaler set to 8.
* IWDG_Prescaler_16: IWDG prescaler set to 16.
* IWDG_Prescaler_32: IWDG prescaler set to 32.
* IWDG_Prescaler_64: IWDG prescaler set to 64.
* IWDG_Prescaler_128: IWDG prescaler set to 128.
* IWDG_Prescaler_256: IWDG prescaler set to 256.
* Return : None
*******************************************************************************/
void IWDG_SetPrescaler(uint8_t IWDG_Prescaler)
{
IWDG->PSCR = IWDG_Prescaler;
}
/*******************************************************************************
* Function Name : IWDG_SetReload
* Description : Sets IWDG Reload value.
* Input : Reload: specifies the IWDG Reload value.
* This parameter must be a number between 0 and 0x0FFF.
* Return : None
*******************************************************************************/
void IWDG_SetReload(uint16_t Reload)
{
IWDG->RLDR = Reload;
}
/*******************************************************************************
* Function Name : IWDG_ReloadCounter
* Description : Reloads IWDG counter with value defined in the reload register.
* Input : None
* Return : None
*******************************************************************************/
void IWDG_ReloadCounter(void)
{
IWDG->CTLR = CTLR_KEY_Reload;
}
/*******************************************************************************
* Function Name : IWDG_Enable
* Description : Enables IWDG (write access to IWDG_PR and IWDG_RLR registers disabled).
* Input : None
* Return : None
*******************************************************************************/
void IWDG_Enable(void)
{
IWDG->CTLR = CTLR_KEY_Enable;
}
/*******************************************************************************
* Function Name : IWDG_GetFlagStatus
* Description : Checks whether the specified IWDG flag is set or not.
* Input : IWDG_FLAG: specifies the flag to check.
* IWDG_FLAG_PVU: Prescaler Value Update on going.
* IWDG_FLAG_RVU: Reload Value Update on going.
* Return : FlagStatus: SET or RESET.
*******************************************************************************/
FlagStatus IWDG_GetFlagStatus(uint16_t IWDG_FLAG)
{
FlagStatus bitstatus = RESET;
if ((IWDG->STATR & IWDG_FLAG) != (uint32_t)RESET)
{
bitstatus = SET;
}
else
{
bitstatus = RESET;
}
return bitstatus;
}
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