/********************************** (C) COPYRIGHT  *******************************
 * File Name          : ch32f10x_exti.c
 * Author             : WCH
 * Version            : V1.0.0
 * Date               : 2019/10/15
 * Description        : This file provides all the EXTI firmware functions.
 * Copyright (c) 2021 Nanjing Qinheng Microelectronics Co., Ltd.
 * SPDX-License-Identifier: Apache-2.0
 ***************************************************************************************/
#include "ch32f10x_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;
}

