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/********************************** (C) COPYRIGHT *******************************
* File Name : ch32v10x_exti.c
* Author : WCH
* Version : V1.0.0
* Date : 2020/04/30
* Description : This file provides all the EXTI firmware functions.
* Copyright (c) 2021 Nanjing Qinheng Microelectronics Co., Ltd.
* SPDX-License-Identifier: Apache-2.0
***************************************************************************************/
#include "ch32v10x_exti.h"
/* No interrupt selected */
#define EXTI_LINENONE ((uint32_t)0x00000)
/*********************************************************************
* @fn EXTI_DeInit
*
* @brief Deinitializes the EXTI peripheral registers to their default
* reset values.
*
* @return none.
*/
void EXTI_DeInit(void)
{
EXTI->INTENR = 0x00000000;
EXTI->EVENR = 0x00000000;
EXTI->RTENR = 0x00000000;
EXTI->FTENR = 0x00000000;
EXTI->INTFR = 0x000FFFFF;
}
/*********************************************************************
* @fn EXTI_Init
*
* @brief Initializes the EXTI peripheral according to the specified
* parameters in the EXTI_InitStruct.
*
* @param 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;
}
}
/*********************************************************************
* @fn EXTI_StructInit
*
* @brief Fills each EXTI_InitStruct member with its reset value.
*
* @param 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;
}
/*********************************************************************
* @fn EXTI_GenerateSWInterrupt
*
* @brief Generates a Software interrupt.
*
* @param EXTI_Line - specifies the EXTI lines to be enabled or disabled.
*
* @return none.
*/
void EXTI_GenerateSWInterrupt(uint32_t EXTI_Line)
{
EXTI->SWIEVR |= EXTI_Line;
}
/*********************************************************************
* @fn EXTI_GetFlagStatus
*
* @brief Checks whether the specified EXTI line flag is set or not.
*
* @param 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;
}
/*********************************************************************
* @fn EXTI_ClearFlag
*
* @brief Clears the EXTI's line pending flags.
*
* @param EXTI_Line - specifies the EXTI lines to be enabled or disabled.
*
* @return None
*/
void EXTI_ClearFlag(uint32_t EXTI_Line)
{
EXTI->INTFR = EXTI_Line;
}
/*********************************************************************
* @fn EXTI_GetITStatus
*
* @brief Checks whether the specified EXTI line is asserted or not.
*
* @param 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;
}
/*********************************************************************
* @fn EXTI_ClearITPendingBit
*
* @brief Clears the EXTI's line pending bits.
*
* @param 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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