stm32f4xx_exti.c
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r18 | /** | ||
****************************************************************************** | ||||
* @file stm32f4xx_exti.c | ||||
* @author MCD Application Team | ||||
* @version V1.0.0RC1 | ||||
* @date 25-August-2011 | ||||
* @brief This file provides firmware functions to manage the following | ||||
* functionalities of the EXTI peripheral: | ||||
* - Initialization and Configuration | ||||
* - Interrupts and flags management | ||||
* | ||||
* @verbatim | ||||
* | ||||
* =================================================================== | ||||
* EXTI features | ||||
* =================================================================== | ||||
* | ||||
* External interrupt/event lines are mapped as following: | ||||
* 1- All available GPIO pins are connected to the 16 external | ||||
* interrupt/event lines from EXTI0 to EXTI15. | ||||
* 2- EXTI line 16 is connected to the PVD Output | ||||
* 3- EXTI line 17 is connected to the RTC Alarm event | ||||
* 4- EXTI line 18 is connected to the USB OTG FS Wakeup from suspend event | ||||
* 5- EXTI line 19 is connected to the Ethernet Wakeup event | ||||
* 6- EXTI line 20 is connected to the USB OTG HS (configured in FS) Wakeup event | ||||
* 7- EXTI line 21 is connected to the RTC Tamper and Time Stamp events | ||||
* 8- EXTI line 22 is connected to the RTC Wakeup event | ||||
* | ||||
* =================================================================== | ||||
* How to use this driver | ||||
* =================================================================== | ||||
* | ||||
* In order to use an I/O pin as an external interrupt source, follow | ||||
* steps below: | ||||
* 1- Configure the I/O in input mode using GPIO_Init() | ||||
* 2- Select the input source pin for the EXTI line using SYSCFG_EXTILineConfig() | ||||
* 3- Select the mode(interrupt, event) and configure the trigger | ||||
* selection (Rising, falling or both) using EXTI_Init() | ||||
* 4- Configure NVIC IRQ channel mapped to the EXTI line using NVIC_Init() | ||||
* | ||||
* @note SYSCFG APB clock must be enabled to get write access to SYSCFG_EXTICRx | ||||
* registers using RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE); | ||||
* | ||||
* @endverbatim | ||||
* | ||||
****************************************************************************** | ||||
* @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 "stm32f4xx_exti.h" | ||||
/** @addtogroup STM32F4xx_StdPeriph_Driver | ||||
* @{ | ||||
*/ | ||||
/** @defgroup EXTI | ||||
* @brief EXTI driver modules | ||||
* @{ | ||||
*/ | ||||
/* Private typedef -----------------------------------------------------------*/ | ||||
/* Private define ------------------------------------------------------------*/ | ||||
#define EXTI_LINENONE ((uint32_t)0x00000) /* No interrupt selected */ | ||||
/* Private macro -------------------------------------------------------------*/ | ||||
/* Private variables ---------------------------------------------------------*/ | ||||
/* Private function prototypes -----------------------------------------------*/ | ||||
/* Private functions ---------------------------------------------------------*/ | ||||
/** @defgroup EXTI_Private_Functions | ||||
* @{ | ||||
*/ | ||||
/** @defgroup EXTI_Group1 Initialization and Configuration functions | ||||
* @brief Initialization and Configuration functions | ||||
* | ||||
@verbatim | ||||
=============================================================================== | ||||
Initialization and Configuration functions | ||||
=============================================================================== | ||||
@endverbatim | ||||
* @{ | ||||
*/ | ||||
/** | ||||
* @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 = 0x007FFFFF; | ||||
} | ||||
/** | ||||
* @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) | ||||
{ | ||||
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) | ||||
{ | ||||
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 on selected EXTI line. | ||||
* @param EXTI_Line: specifies the EXTI line on which the software interrupt | ||||
* will be generated. | ||||
* This parameter can be any combination of EXTI_Linex where x can be (0..22) | ||||
* @retval None | ||||
*/ | ||||
void EXTI_GenerateSWInterrupt(uint32_t EXTI_Line) | ||||
{ | ||||
/* Check the parameters */ | ||||
assert_param(IS_EXTI_LINE(EXTI_Line)); | ||||
EXTI->SWIER |= EXTI_Line; | ||||
} | ||||
/** | ||||
* @} | ||||
*/ | ||||
/** @defgroup EXTI_Group2 Interrupts and flags management functions | ||||
* @brief Interrupts and flags management functions | ||||
* | ||||
@verbatim | ||||
=============================================================================== | ||||
Interrupts and flags management functions | ||||
=============================================================================== | ||||
@endverbatim | ||||
* @{ | ||||
*/ | ||||
/** | ||||
* @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 EXTI_Linex where x can be(0..22) | ||||
* @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'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..22) | ||||
* @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 EXTI_Linex where x can be(0..22) | ||||
* @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'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..22) | ||||
* @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 2011 STMicroelectronics *****END OF FILE****/ | ||||