rt-thread/bsp/mm32l3xx/Libraries/MM32L3xx/HAL_lib/src/HAL_exti.c

/**
******************************************************************************
* @file    HAL_exti.c
* @author  AE Team
* @version V1.0.0
* @date    28/7/2017
* @brief   This file provides all the EXTI firmware functions.
******************************************************************************
* @copy
*
* THE PRESENT FIRMWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS
* WITH CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE
* TIME. AS A RESULT, MindMotion SHALL NOT BE HELD LIABLE FOR ANY
* DIRECT, INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING
* FROM THE CONTENT OF SUCH FIRMWARE AND/OR THE USE MADE BY CUSTOMERS OF THE
* CODING INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS.
*
* <h2><center>&copy; COPYRIGHT 2017 MindMotion</center></h2>
*/ 

/* Includes ------------------------------------------------------------------*/
#include "HAL_exti.h"

/** @addtogroup StdPeriph_Driver
* @{
*/

/** @defgroup EXTI 
* @brief EXTI driver modules
* @{
*/

/** @defgroup EXTI_Private_TypesDefinitions
* @{
*/

/**
* @}
*/

/** @defgroup EXTI_Private_Defines
* @{
*/

#define EXTI_LineNone    ((uint32_t)0x00000)  /* No interrupt selected */

/**
* @}
*/

/** @defgroup EXTI_Private_Macros
* @{
*/

/**
* @}
*/

/** @defgroup EXTI_Private_Variables
* @{
*/

/**
* @}
*/

/** @defgroup EXTI_Private_FunctionPrototypes
* @{
*/

/**
* @}
*/

/** @defgroup EXTI_Private_Functions
* @{
*/

/**
* @brief  Deinitializes the EXTI peripheral registers to their default 
*   reset values.
* @param  None
* @retval : None
*/
void EXTI_DeInit(void)
{
    EXTI->IMR = 0x00000000;
    EXTI->EMR = 0x00000000;
    EXTI->RTSR = 0x00000000; 
    EXTI->FTSR = 0x00000000; 
    EXTI->PR = 0x001FFFFF;
}

/**
* @brief  Initializes the EXTI peripheral according to the specified
*   parameters in the EXTI_InitStruct.
* @param EXTI_InitStruct: pointer to a EXTI_InitTypeDef structure
*   that contains the configuration information for the EXTI
*   peripheral.
* @retval : None
*/
void EXTI_Init(EXTI_InitTypeDef* EXTI_InitStruct)
{
    /* Check the parameters */
    assert_param(IS_EXTI_MODE(EXTI_InitStruct->EXTI_Mode));
    assert_param(IS_EXTI_TRIGGER(EXTI_InitStruct->EXTI_Trigger));
    assert_param(IS_EXTI_LINE(EXTI_InitStruct->EXTI_Line));  
    assert_param(IS_FUNCTIONAL_STATE(EXTI_InitStruct->EXTI_LineCmd));
    
    if (EXTI_InitStruct->EXTI_LineCmd != DISABLE)
    {
        /* Clear EXTI line configuration */
        EXTI->IMR &= ~EXTI_InitStruct->EXTI_Line;
        EXTI->EMR &= ~EXTI_InitStruct->EXTI_Line;
        
        *(__IO uint32_t *)(EXTI_BASE + (uint32_t)EXTI_InitStruct->EXTI_Mode)|= EXTI_InitStruct->EXTI_Line;
        /* Clear Rising Falling edge configuration */
        EXTI->RTSR &= ~EXTI_InitStruct->EXTI_Line;
        EXTI->FTSR &= ~EXTI_InitStruct->EXTI_Line;
        
        /* Select the trigger for the selected external interrupts */
        if (EXTI_InitStruct->EXTI_Trigger == EXTI_Trigger_Rising_Falling)
        {
            /* Rising Falling edge */
            EXTI->RTSR |= EXTI_InitStruct->EXTI_Line;
            EXTI->FTSR |= EXTI_InitStruct->EXTI_Line;
        }
        else
        {
            *(__IO uint32_t *)(EXTI_BASE + (uint32_t)EXTI_InitStruct->EXTI_Trigger)|= EXTI_InitStruct->EXTI_Line;
        }
    }
    else
    {
        /* Disable the selected external lines */
        *(__IO uint32_t *)(EXTI_BASE + (uint32_t)EXTI_InitStruct->EXTI_Mode)&= ~EXTI_InitStruct->EXTI_Line;
    }
}

/**
* @brief  Fills each EXTI_InitStruct member with its reset value.
* @param EXTI_InitStruct: pointer to a EXTI_InitTypeDef structure
*   which will be initialized.
* @retval : 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;
}

/**
* @brief  Generates a Software interrupt.
* @param EXTI_Line: specifies the EXTI lines to be enabled or
*   disabled.
*   This parameter can be any combination of EXTI_Linex where 
*   x can be (0..18).
* @retval : None
*/
void EXTI_GenerateSWInterrupt(uint32_t EXTI_Line)
{
    /* Check the parameters */
    assert_param(IS_EXTI_LINE(EXTI_Line));
    
    EXTI->SWIER |= EXTI_Line;
}

/**
* @brief  Checks whether the specified EXTI line flag is set or not.
* @param EXTI_Line: specifies the EXTI line flag to check.
*   This parameter can be:
* @arg EXTI_Linex: External interrupt line x where x(0..18)
* @retval : The new state of EXTI_Line (SET or RESET).
*/
FlagStatus EXTI_GetFlagStatus(uint32_t EXTI_Line)
{
    FlagStatus bitstatus = RESET;
    /* Check the parameters */
    assert_param(IS_GET_EXTI_LINE(EXTI_Line));
    
    if ((EXTI->PR & EXTI_Line) != (uint32_t)RESET)
    {
        bitstatus = SET;
    }
    else
    {
        bitstatus = RESET;
    }
    return bitstatus;
}

/**
* @brief  Clears the EXTI<EFBFBD>s line pending flags.
* @param EXTI_Line: specifies the EXTI lines flags to clear.
*   This parameter can be any combination of EXTI_Linex where 
*   x can be (0..18).
* @retval : None
*/
void EXTI_ClearFlag(uint32_t EXTI_Line)
{
    /* Check the parameters */
    assert_param(IS_EXTI_LINE(EXTI_Line));
    
    EXTI->PR = EXTI_Line;
}

/**
* @brief  Checks whether the specified EXTI line is asserted or not.
* @param EXTI_Line: specifies the EXTI line to check.
*   This parameter can be:
* @arg EXTI_Linex: External interrupt line x where x(0..18)
* @retval : The new state of EXTI_Line (SET or RESET).
*/
ITStatus EXTI_GetITStatus(uint32_t EXTI_Line)
{
    ITStatus bitstatus = RESET;
    uint32_t enablestatus = 0;
    /* Check the parameters */
    assert_param(IS_GET_EXTI_LINE(EXTI_Line));
    
    enablestatus =  EXTI->IMR & EXTI_Line;
    if (((EXTI->PR & EXTI_Line) != (uint32_t)RESET) && (enablestatus != (uint32_t)RESET))
    {
        bitstatus = SET;
    }
    else
    {
        bitstatus = RESET;
    }
    return bitstatus;
}

/**
* @brief  Clears the EXTI<EFBFBD>s line pending bits.
* @param EXTI_Line: specifies the EXTI lines to clear.
*   This parameter can be any combination of EXTI_Linex where 
*   x can be (0..18).
* @retval : None
*/
void EXTI_ClearITPendingBit(uint32_t EXTI_Line)
{
    /* Check the parameters */
    assert_param(IS_EXTI_LINE(EXTI_Line));
    
    EXTI->PR = EXTI_Line;
}

/**
* @}
*/

/**
* @}
*/

/**
* @}
*/

/*-------------------------(C) COPYRIGHT 2017 MindMotion ----------------------*/