307 lines
10 KiB
C
307 lines
10 KiB
C
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/**
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******************************************************************************
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* @file stm32f4xx_exti.c
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* @author MCD Application Team
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* @version V1.0.0RC1
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* @date 25-August-2011
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* @brief This file provides firmware functions to manage the following
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* functionalities of the EXTI peripheral:
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* - Initialization and Configuration
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* - Interrupts and flags management
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*
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* @verbatim
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*
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* ===================================================================
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* EXTI features
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* ===================================================================
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*
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* External interrupt/event lines are mapped as following:
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* 1- All available GPIO pins are connected to the 16 external
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* interrupt/event lines from EXTI0 to EXTI15.
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* 2- EXTI line 16 is connected to the PVD Output
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* 3- EXTI line 17 is connected to the RTC Alarm event
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* 4- EXTI line 18 is connected to the USB OTG FS Wakeup from suspend event
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* 5- EXTI line 19 is connected to the Ethernet Wakeup event
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* 6- EXTI line 20 is connected to the USB OTG HS (configured in FS) Wakeup event
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* 7- EXTI line 21 is connected to the RTC Tamper and Time Stamp events
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* 8- EXTI line 22 is connected to the RTC Wakeup event
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*
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* ===================================================================
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* How to use this driver
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* ===================================================================
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*
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* In order to use an I/O pin as an external interrupt source, follow
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* steps below:
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* 1- Configure the I/O in input mode using GPIO_Init()
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* 2- Select the input source pin for the EXTI line using SYSCFG_EXTILineConfig()
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* 3- Select the mode(interrupt, event) and configure the trigger
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* selection (Rising, falling or both) using EXTI_Init()
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* 4- Configure NVIC IRQ channel mapped to the EXTI line using NVIC_Init()
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*
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* @note SYSCFG APB clock must be enabled to get write access to SYSCFG_EXTICRx
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* registers using RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE);
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*
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* @endverbatim
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*
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******************************************************************************
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* @attention
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*
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* THE PRESENT FIRMWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS
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* WITH CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE
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* TIME. AS A RESULT, STMICROELECTRONICS SHALL NOT BE HELD LIABLE FOR ANY
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* DIRECT, INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING
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* FROM THE CONTENT OF SUCH FIRMWARE AND/OR THE USE MADE BY CUSTOMERS OF THE
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* CODING INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS.
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*
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* <h2><center>© COPYRIGHT 2011 STMicroelectronics</center></h2>
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******************************************************************************
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*/
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/* Includes ------------------------------------------------------------------*/
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#include "stm32f4xx_exti.h"
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/** @addtogroup STM32F4xx_StdPeriph_Driver
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* @{
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*/
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/** @defgroup EXTI
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* @brief EXTI driver modules
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* @{
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*/
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/* Private typedef -----------------------------------------------------------*/
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/* Private define ------------------------------------------------------------*/
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#define EXTI_LINENONE ((uint32_t)0x00000) /* No interrupt selected */
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/* Private macro -------------------------------------------------------------*/
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/* Private variables ---------------------------------------------------------*/
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/* Private function prototypes -----------------------------------------------*/
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/* Private functions ---------------------------------------------------------*/
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/** @defgroup EXTI_Private_Functions
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* @{
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*/
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/** @defgroup EXTI_Group1 Initialization and Configuration functions
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* @brief Initialization and Configuration functions
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*
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@verbatim
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===============================================================================
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Initialization and Configuration functions
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===============================================================================
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@endverbatim
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* @{
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*/
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/**
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* @brief Deinitializes the EXTI peripheral registers to their default reset values.
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* @param None
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* @retval None
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*/
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void EXTI_DeInit(void)
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{
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EXTI->IMR = 0x00000000;
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EXTI->EMR = 0x00000000;
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EXTI->RTSR = 0x00000000;
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EXTI->FTSR = 0x00000000;
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EXTI->PR = 0x007FFFFF;
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}
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/**
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* @brief Initializes the EXTI peripheral according to the specified
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* parameters in the EXTI_InitStruct.
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* @param EXTI_InitStruct: pointer to a EXTI_InitTypeDef structure
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* that contains the configuration information for the EXTI peripheral.
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* @retval None
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*/
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void EXTI_Init(EXTI_InitTypeDef* EXTI_InitStruct)
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{
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uint32_t tmp = 0;
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/* Check the parameters */
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assert_param(IS_EXTI_MODE(EXTI_InitStruct->EXTI_Mode));
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assert_param(IS_EXTI_TRIGGER(EXTI_InitStruct->EXTI_Trigger));
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assert_param(IS_EXTI_LINE(EXTI_InitStruct->EXTI_Line));
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assert_param(IS_FUNCTIONAL_STATE(EXTI_InitStruct->EXTI_LineCmd));
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tmp = (uint32_t)EXTI_BASE;
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if (EXTI_InitStruct->EXTI_LineCmd != DISABLE)
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{
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/* Clear EXTI line configuration */
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EXTI->IMR &= ~EXTI_InitStruct->EXTI_Line;
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EXTI->EMR &= ~EXTI_InitStruct->EXTI_Line;
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tmp += EXTI_InitStruct->EXTI_Mode;
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*(__IO uint32_t *) tmp |= EXTI_InitStruct->EXTI_Line;
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/* Clear Rising Falling edge configuration */
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EXTI->RTSR &= ~EXTI_InitStruct->EXTI_Line;
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EXTI->FTSR &= ~EXTI_InitStruct->EXTI_Line;
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/* Select the trigger for the selected external interrupts */
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if (EXTI_InitStruct->EXTI_Trigger == EXTI_Trigger_Rising_Falling)
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{
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/* Rising Falling edge */
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EXTI->RTSR |= EXTI_InitStruct->EXTI_Line;
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EXTI->FTSR |= EXTI_InitStruct->EXTI_Line;
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}
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else
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{
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tmp = (uint32_t)EXTI_BASE;
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tmp += EXTI_InitStruct->EXTI_Trigger;
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*(__IO uint32_t *) tmp |= EXTI_InitStruct->EXTI_Line;
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}
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}
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else
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{
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tmp += EXTI_InitStruct->EXTI_Mode;
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/* Disable the selected external lines */
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*(__IO uint32_t *) tmp &= ~EXTI_InitStruct->EXTI_Line;
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}
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}
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/**
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* @brief Fills each EXTI_InitStruct member with its reset value.
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* @param EXTI_InitStruct: pointer to a EXTI_InitTypeDef structure which will
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* be initialized.
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* @retval None
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*/
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void EXTI_StructInit(EXTI_InitTypeDef* EXTI_InitStruct)
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{
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EXTI_InitStruct->EXTI_Line = EXTI_LINENONE;
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EXTI_InitStruct->EXTI_Mode = EXTI_Mode_Interrupt;
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EXTI_InitStruct->EXTI_Trigger = EXTI_Trigger_Falling;
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EXTI_InitStruct->EXTI_LineCmd = DISABLE;
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}
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/**
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* @brief Generates a Software interrupt on selected EXTI line.
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* @param EXTI_Line: specifies the EXTI line on which the software interrupt
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* will be generated.
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* This parameter can be any combination of EXTI_Linex where x can be (0..22)
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* @retval None
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*/
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void EXTI_GenerateSWInterrupt(uint32_t EXTI_Line)
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{
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/* Check the parameters */
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assert_param(IS_EXTI_LINE(EXTI_Line));
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EXTI->SWIER |= EXTI_Line;
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}
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/**
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* @}
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*/
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/** @defgroup EXTI_Group2 Interrupts and flags management functions
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* @brief Interrupts and flags management functions
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*
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@verbatim
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===============================================================================
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Interrupts and flags management functions
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===============================================================================
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@endverbatim
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* @{
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*/
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/**
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* @brief Checks whether the specified EXTI line flag is set or not.
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* @param EXTI_Line: specifies the EXTI line flag to check.
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* This parameter can be EXTI_Linex where x can be(0..22)
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* @retval The new state of EXTI_Line (SET or RESET).
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*/
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FlagStatus EXTI_GetFlagStatus(uint32_t EXTI_Line)
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{
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FlagStatus bitstatus = RESET;
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/* Check the parameters */
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assert_param(IS_GET_EXTI_LINE(EXTI_Line));
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if ((EXTI->PR & EXTI_Line) != (uint32_t)RESET)
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{
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bitstatus = SET;
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}
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else
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{
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bitstatus = RESET;
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}
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return bitstatus;
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}
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/**
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* @brief Clears the EXTI's line pending flags.
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* @param EXTI_Line: specifies the EXTI lines flags to clear.
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* This parameter can be any combination of EXTI_Linex where x can be (0..22)
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* @retval None
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*/
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void EXTI_ClearFlag(uint32_t EXTI_Line)
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{
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/* Check the parameters */
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assert_param(IS_EXTI_LINE(EXTI_Line));
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EXTI->PR = EXTI_Line;
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}
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/**
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* @brief Checks whether the specified EXTI line is asserted or not.
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* @param EXTI_Line: specifies the EXTI line to check.
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* This parameter can be EXTI_Linex where x can be(0..22)
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* @retval The new state of EXTI_Line (SET or RESET).
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*/
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ITStatus EXTI_GetITStatus(uint32_t EXTI_Line)
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{
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ITStatus bitstatus = RESET;
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uint32_t enablestatus = 0;
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/* Check the parameters */
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assert_param(IS_GET_EXTI_LINE(EXTI_Line));
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enablestatus = EXTI->IMR & EXTI_Line;
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if (((EXTI->PR & EXTI_Line) != (uint32_t)RESET) && (enablestatus != (uint32_t)RESET))
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{
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bitstatus = SET;
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}
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else
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{
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bitstatus = RESET;
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}
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return bitstatus;
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}
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/**
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* @brief Clears the EXTI's line pending bits.
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* @param EXTI_Line: specifies the EXTI lines to clear.
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* This parameter can be any combination of EXTI_Linex where x can be (0..22)
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* @retval None
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*/
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void EXTI_ClearITPendingBit(uint32_t EXTI_Line)
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{
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/* Check the parameters */
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assert_param(IS_EXTI_LINE(EXTI_Line));
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EXTI->PR = EXTI_Line;
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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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/**
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* @}
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*/
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/******************* (C) COPYRIGHT 2011 STMicroelectronics *****END OF FILE****/
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