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/********************************** (C) COPYRIGHT *******************************
* File Name : ch32f20x_exti.c
* Author : WCH
* Version : V1.0.0
* Date : 2021/08/08
* Description : This file provides all the EXTI firmware functions.
***************************************************************************************/
#include "ch32f20x_exti.h"
/* No interrupt selected */
#define EXTI_LINENONE ((uint32_t)0x00000)
/********************************************************************************
* Function Name : EXTI_DeInit
* Description : Deinitializes the EXTI peripheral registers to their default
* reset values.
* Input : None
* Return : None
*********************************************************************************/
void EXTI_DeInit(void)
{
EXTI->INTENR = 0x00000000;
EXTI->EVENR = 0x00000000;
EXTI->RTENR = 0x00000000;
EXTI->FTENR = 0x00000000;
EXTI->INTFR = 0x000FFFFF;
}
/********************************************************************************
* Function Name : EXTI_Init
* Description : Initializes the EXTI peripheral according to the specified
* parameters in the EXTI_InitStruct.
* Input : EXTI_InitStruct: pointer to a EXTI_InitTypeDef structure
* Return : None
*********************************************************************************/
void EXTI_Init(EXTI_InitTypeDef* EXTI_InitStruct)
{
uint32_t tmp = 0;
tmp = (uint32_t)EXTI_BASE;
if (EXTI_InitStruct->EXTI_LineCmd != DISABLE)
{
EXTI->INTENR &= ~EXTI_InitStruct->EXTI_Line;
EXTI->EVENR &= ~EXTI_InitStruct->EXTI_Line;
tmp += EXTI_InitStruct->EXTI_Mode;
*(__IO uint32_t *) tmp |= EXTI_InitStruct->EXTI_Line;
EXTI->RTENR &= ~EXTI_InitStruct->EXTI_Line;
EXTI->FTENR &= ~EXTI_InitStruct->EXTI_Line;
if (EXTI_InitStruct->EXTI_Trigger == EXTI_Trigger_Rising_Falling)
{
EXTI->RTENR |= EXTI_InitStruct->EXTI_Line;
EXTI->FTENR |= EXTI_InitStruct->EXTI_Line;
}
else
{
tmp = (uint32_t)EXTI_BASE;
tmp += EXTI_InitStruct->EXTI_Trigger;
*(__IO uint32_t *) tmp |= EXTI_InitStruct->EXTI_Line;
}
}
else
{
tmp += EXTI_InitStruct->EXTI_Mode;
*(__IO uint32_t *) tmp &= ~EXTI_InitStruct->EXTI_Line;
}
}
/********************************************************************************
* Function Name : EXTI_StructInit
* Description : Fills each EXTI_InitStruct member with its reset value.
* Input : EXTI_InitStruct: pointer to a EXTI_InitTypeDef structure
* Return : None
*********************************************************************************/
void EXTI_StructInit(EXTI_InitTypeDef* EXTI_InitStruct)
{
EXTI_InitStruct->EXTI_Line = EXTI_LINENONE;
EXTI_InitStruct->EXTI_Mode = EXTI_Mode_Interrupt;
EXTI_InitStruct->EXTI_Trigger = EXTI_Trigger_Falling;
EXTI_InitStruct->EXTI_LineCmd = DISABLE;
}
/********************************************************************************
* Function Name : EXTI_GenerateSWInterrupt
* Description : Generates a Software interrupt.
* Input : EXTI_Line: specifies the EXTI lines to be enabled or disabled.
* Return : None
*********************************************************************************/
void EXTI_GenerateSWInterrupt(uint32_t EXTI_Line)
{
EXTI->SWIEVR |= EXTI_Line;
}
/********************************************************************************
* Function Name : EXTI_GetFlagStatus
* Description : Checks whether the specified EXTI line flag is set or not.
* Input : EXTI_Line: specifies the EXTI lines to be enabled or disabled.
* Return : The new state of EXTI_Line (SET or RESET).
*********************************************************************************/
FlagStatus EXTI_GetFlagStatus(uint32_t EXTI_Line)
{
FlagStatus bitstatus = RESET;
if ((EXTI->INTFR & EXTI_Line) != (uint32_t)RESET)
{
bitstatus = SET;
}
else
{
bitstatus = RESET;
}
return bitstatus;
}
/********************************************************************************
* Function Name : EXTI_ClearFlag
* Description : Clears the EXTI's line pending flags.
* Input : EXTI_Line: specifies the EXTI lines to be enabled or disabled.
* Return : None
*********************************************************************************/
void EXTI_ClearFlag(uint32_t EXTI_Line)
{
EXTI->INTFR = EXTI_Line;
}
/********************************************************************************
* Function Name : EXTI_GetITStatus
* Description : Checks whether the specified EXTI line is asserted or not.
* Input : EXTI_Line: specifies the EXTI lines to be enabled or disabled.
* Return : The new state of EXTI_Line (SET or RESET).
*********************************************************************************/
ITStatus EXTI_GetITStatus(uint32_t EXTI_Line)
{
ITStatus bitstatus = RESET;
uint32_t enablestatus = 0;
enablestatus = EXTI->INTENR & EXTI_Line;
if (((EXTI->INTFR & EXTI_Line) != (uint32_t)RESET) && (enablestatus != (uint32_t)RESET))
{
bitstatus = SET;
}
else
{
bitstatus = RESET;
}
return bitstatus;
}
/********************************************************************************
* Function Name : EXTI_ClearITPendingBit
* Description : Clears the EXTI's line pending bits.
* Input : EXTI_Line: specifies the EXTI lines to be enabled or disabled.
* Return : None
*********************************************************************************/
void EXTI_ClearITPendingBit(uint32_t EXTI_Line)
{
EXTI->INTFR = EXTI_Line;
}
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