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/**
******************************************************************************
* @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.
*
* <h2><center>© COPYRIGHT 2011 STMicroelectronics</center></h2>
******************************************************************************
*/
/* 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)//外部中斷初始化為默認值
{
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)//外部中斷根據(jù)結(jié)構(gòu)體的參數(shù)進行初始化
{
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)//外部中斷的結(jié)構(gòu)體參數(shù)恢復(fù)為默認值
{
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)//產(chǎn)生一個軟件中斷
{
/* 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)//檢測外部中斷的標(biāo)志的狀態(tài)
{
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)//清除外部中斷的標(biāo)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)//檢測使能的外部中斷的標(biāo)志的狀態(tài)
{
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)//清除外部中斷的掛起位
{
/* 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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