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stm32f10x_exti.c

  • /**
  •   ******************************************************************************
  •   * @file    STM32f10x_exti.c
  •   * @author  MCD Application Team
  •   * @version V3.5.0
  •   * @date    11-March-2011
  •   * @brief   This file provides all the EXTI firmware functions.
  •   ******************************************************************************
  •   * @attention
  •   *
  •   * 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, STMICROELECTRONICS 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.
  •   *
  •   *

    © COPYRIGHT 2011 STMicroelectronics

  •   ******************************************************************************
  •   */
  • /* Includes ------------------------------------------------------------------*/
  • #include "stm32f10x_exti.h"
  • /** @addtogroup STM32F10x_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)//外部中断初始化为默认值
  • {
  •   EXTI->IMR = 0x00000000;
  •   EXTI->EMR = 0x00000000;
  •   EXTI->RTSR = 0x00000000;
  •   EXTI->FTSR = 0x00000000;
  •   EXTI->PR = 0x000FFFFF;
  • }
  • /**
  •   * @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)//外部中断根据结构体的参数进行初始化
  • {
  •   uint32_t tmp = 0;
  •   /* 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));
  •   tmp = (uint32_t)EXTI_BASE;
  •   if (EXTI_InitStruct->EXTI_LineCmd != DISABLE)
  •   {
  •     /* Clear EXTI line configuration */
  •     EXTI->IMR &= ~EXTI_InitStruct->EXTI_Line;
  •     EXTI->EMR &= ~EXTI_InitStruct->EXTI_Line;
  •     tmp += EXTI_InitStruct->EXTI_Mode;
  •     *(__IO uint32_t *) tmp |= 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
  •     {
  •       tmp = (uint32_t)EXTI_BASE;
  •       tmp += EXTI_InitStruct->EXTI_Trigger;
  •       *(__IO uint32_t *) tmp |= EXTI_InitStruct->EXTI_Line;
  •     }
  •   }
  •   else
  •   {
  •     tmp += EXTI_InitStruct->EXTI_Mode;
  •     /* Disable the selected external lines */
  •     *(__IO uint32_t *) tmp &= ~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)//外部中断的结构体参数恢复为默认值
  • {
  •   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..19).
  •   * @retval None
  •   */
  • void EXTI_GenerateSWInterrupt(uint32_t EXTI_Line)//产生一个软件中断
  • {
  •   /* 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..19)
  •   * @retval The new state of EXTI_Line (SET or RESET).
  •   */
  • FlagStatus EXTI_GetFlagStatus(uint32_t EXTI_Line)//检测外部中断的标志的状态
  • {
  •   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'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..19).
  •   * @retval None
  •   */
  • void EXTI_ClearFlag(uint32_t EXTI_Line)//清除外部中断的标志
  • {
  •   /* 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..19)
  •   * @retval The new state of EXTI_Line (SET or RESET).
  •   */
  • ITStatus EXTI_GetITStatus(uint32_t EXTI_Line)//检测使能的外部中断的标志的状态
  • {
  •   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'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..19).
  •   * @retval None
  •   */
  • void EXTI_ClearITPendingBit(uint32_t EXTI_Line)//清除外部中断的挂起位
  • {
  •   /* Check the parameters */
  •   assert_param(IS_EXTI_LINE(EXTI_Line));
  •   EXTI->PR = EXTI_Line;
  • }
  • /**
  •   * @}
  •   */
  • /**
  •   * @}
  •   */
  • /**
  •   * @}
  •   */
  • /******************* (C) COPYRIGHT 2011 STMicroelectronics *****END OF FILE****/




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