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2 mjames 1 
/**
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  ******************************************************************************
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  * @file    stm32f1xx_ll_exti.c
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  * @author  MCD Application Team
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  * @brief   EXTI LL module driver.
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  ******************************************************************************
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  * @attention
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  *
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  * Copyright (c) 2016 STMicroelectronics.
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  * All rights reserved.
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  *
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  * This software is licensed under terms that can be found in the LICENSE file
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  * in the root directory of this software component.
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  * If no LICENSE file comes with this software, it is provided AS-IS.
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  *
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  ******************************************************************************
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  */
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#if defined(USE_FULL_LL_DRIVER)
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/* Includes ------------------------------------------------------------------*/
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#include "stm32f1xx_ll_exti.h"
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#ifdef  USE_FULL_ASSERT
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#include "stm32_assert.h"
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#else
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#define assert_param(expr) ((void)0U)
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#endif
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/** @addtogroup STM32F1xx_LL_Driver
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  * @{
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  */
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#if defined (EXTI)
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/** @defgroup EXTI_LL EXTI
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  * @{
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  */
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/* Private types -------------------------------------------------------------*/
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/* Private variables ---------------------------------------------------------*/
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/* Private constants ---------------------------------------------------------*/
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/* Private macros ------------------------------------------------------------*/
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/** @addtogroup EXTI_LL_Private_Macros
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  * @{
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  */
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#define IS_LL_EXTI_LINE_0_31(__VALUE__)              (((__VALUE__) & ~LL_EXTI_LINE_ALL_0_31) == 0x00000000U)
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#define IS_LL_EXTI_MODE(__VALUE__)                   (((__VALUE__) == LL_EXTI_MODE_IT)            \
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                                                   || ((__VALUE__) == LL_EXTI_MODE_EVENT)         \
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                                                   || ((__VALUE__) == LL_EXTI_MODE_IT_EVENT))
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#define IS_LL_EXTI_TRIGGER(__VALUE__)                (((__VALUE__) == LL_EXTI_TRIGGER_NONE)       \
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                                                   || ((__VALUE__) == LL_EXTI_TRIGGER_RISING)     \
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                                                   || ((__VALUE__) == LL_EXTI_TRIGGER_FALLING)    \
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                                                   || ((__VALUE__) == LL_EXTI_TRIGGER_RISING_FALLING))
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/**
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  * @}
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  */
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/* Private function prototypes -----------------------------------------------*/
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/* Exported functions --------------------------------------------------------*/
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/** @addtogroup EXTI_LL_Exported_Functions
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  * @{
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  */
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/** @addtogroup EXTI_LL_EF_Init
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  * @{
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  */
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/**
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  * @brief  De-initialize the EXTI registers to their default reset values.
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  * @retval An ErrorStatus enumeration value:
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  *          - SUCCESS: EXTI registers are de-initialized
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  *          - ERROR: not applicable
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  */
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uint32_t LL_EXTI_DeInit(void)
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{
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  /* Interrupt mask register set to default reset values */
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  LL_EXTI_WriteReg(IMR,   0x00000000U);
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  /* Event mask register set to default reset values */
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  LL_EXTI_WriteReg(EMR,   0x00000000U);
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  /* Rising Trigger selection register set to default reset values */
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  LL_EXTI_WriteReg(RTSR,  0x00000000U);
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  /* Falling Trigger selection register set to default reset values */
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  LL_EXTI_WriteReg(FTSR,  0x00000000U);
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  /* Software interrupt event register set to default reset values */
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  LL_EXTI_WriteReg(SWIER, 0x00000000U);
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  /* Pending register clear */
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  LL_EXTI_WriteReg(PR,    0x000FFFFFU);
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  return SUCCESS;
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}
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/**
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  * @brief  Initialize the EXTI registers according to the specified parameters in EXTI_InitStruct.
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  * @param  EXTI_InitStruct pointer to a @ref LL_EXTI_InitTypeDef structure.
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  * @retval An ErrorStatus enumeration value:
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  *          - SUCCESS: EXTI registers are initialized
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  *          - ERROR: not applicable
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  */
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uint32_t LL_EXTI_Init(LL_EXTI_InitTypeDef *EXTI_InitStruct)
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{
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  ErrorStatus status = SUCCESS;
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  /* Check the parameters */
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  assert_param(IS_LL_EXTI_LINE_0_31(EXTI_InitStruct->Line_0_31));
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  assert_param(IS_FUNCTIONAL_STATE(EXTI_InitStruct->LineCommand));
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  assert_param(IS_LL_EXTI_MODE(EXTI_InitStruct->Mode));
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  /* ENABLE LineCommand */
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  if (EXTI_InitStruct->LineCommand != DISABLE)
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  {
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    assert_param(IS_LL_EXTI_TRIGGER(EXTI_InitStruct->Trigger));
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    /* Configure EXTI Lines in range from 0 to 31 */
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    if (EXTI_InitStruct->Line_0_31 != LL_EXTI_LINE_NONE)
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    {
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      switch (EXTI_InitStruct->Mode)
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      {
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        case LL_EXTI_MODE_IT:
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          /* First Disable Event on provided Lines */
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          LL_EXTI_DisableEvent_0_31(EXTI_InitStruct->Line_0_31);
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          /* Then Enable IT on provided Lines */
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          LL_EXTI_EnableIT_0_31(EXTI_InitStruct->Line_0_31);
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          break;
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        case LL_EXTI_MODE_EVENT:
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          /* First Disable IT on provided Lines */
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          LL_EXTI_DisableIT_0_31(EXTI_InitStruct->Line_0_31);
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          /* Then Enable Event on provided Lines */
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          LL_EXTI_EnableEvent_0_31(EXTI_InitStruct->Line_0_31);
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          break;
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        case LL_EXTI_MODE_IT_EVENT:
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          /* Directly Enable IT & Event on provided Lines */
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          LL_EXTI_EnableIT_0_31(EXTI_InitStruct->Line_0_31);
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          LL_EXTI_EnableEvent_0_31(EXTI_InitStruct->Line_0_31);
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          break;
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        default:
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          status = ERROR;
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          break;
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      }
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      if (EXTI_InitStruct->Trigger != LL_EXTI_TRIGGER_NONE)
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      {
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        switch (EXTI_InitStruct->Trigger)
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        {
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          case LL_EXTI_TRIGGER_RISING:
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            /* First Disable Falling Trigger on provided Lines */
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            LL_EXTI_DisableFallingTrig_0_31(EXTI_InitStruct->Line_0_31);
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            /* Then Enable Rising Trigger on provided Lines */
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            LL_EXTI_EnableRisingTrig_0_31(EXTI_InitStruct->Line_0_31);
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            break;
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          case LL_EXTI_TRIGGER_FALLING:
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            /* First Disable Rising Trigger on provided Lines */
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            LL_EXTI_DisableRisingTrig_0_31(EXTI_InitStruct->Line_0_31);
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            /* Then Enable Falling Trigger on provided Lines */
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            LL_EXTI_EnableFallingTrig_0_31(EXTI_InitStruct->Line_0_31);
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            break;
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          case LL_EXTI_TRIGGER_RISING_FALLING:
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            LL_EXTI_EnableRisingTrig_0_31(EXTI_InitStruct->Line_0_31);
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            LL_EXTI_EnableFallingTrig_0_31(EXTI_InitStruct->Line_0_31);
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            break;
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          default:
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            status = ERROR;
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            break;
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        }
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      }
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    }
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  }
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  /* DISABLE LineCommand */
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  else
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  {
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    /* De-configure EXTI Lines in range from 0 to 31 */
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    LL_EXTI_DisableIT_0_31(EXTI_InitStruct->Line_0_31);
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    LL_EXTI_DisableEvent_0_31(EXTI_InitStruct->Line_0_31);
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  }
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  return status;
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}
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/**
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  * @brief  Set each @ref LL_EXTI_InitTypeDef field to default value.
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  * @param  EXTI_InitStruct Pointer to a @ref LL_EXTI_InitTypeDef structure.
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  * @retval None
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  */
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void LL_EXTI_StructInit(LL_EXTI_InitTypeDef *EXTI_InitStruct)
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{
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  EXTI_InitStruct->Line_0_31      = LL_EXTI_LINE_NONE;
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  EXTI_InitStruct->LineCommand    = DISABLE;
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  EXTI_InitStruct->Mode           = LL_EXTI_MODE_IT;
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  EXTI_InitStruct->Trigger        = LL_EXTI_TRIGGER_FALLING;
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}
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/**
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  * @}
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  */
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/**
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  * @}
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  */
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/**
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  * @}
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  */
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#endif /* defined (EXTI) */
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/**
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  * @}
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  */
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#endif /* USE_FULL_LL_DRIVER */
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