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-/**
- ******************************************************************************
- * @file stm32f4xx_exti.c
- * @author MCD Application Team
- * @version V1.3.0
- * @date 08-November-2013
- * @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:
- (#) All available GPIO pins are connected to the 16 external
- interrupt/event lines from EXTI0 to EXTI15.
- (#) EXTI line 16 is connected to the PVD Output
- (#) EXTI line 17 is connected to the RTC Alarm event
- (#) EXTI line 18 is connected to the USB OTG FS Wakeup from suspend event
- (#) EXTI line 19 is connected to the Ethernet Wakeup event
- (#) EXTI line 20 is connected to the USB OTG HS (configured in FS) Wakeup event
- (#) EXTI line 21 is connected to the RTC Tamper and Time Stamp events
- (#) 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:
- (#) Configure the I/O in input mode using GPIO_Init()
- (#) Select the input source pin for the EXTI line using SYSCFG_EXTILineConfig()
- (#) Select the mode(interrupt, event) and configure the trigger
- selection (Rising, falling or both) using EXTI_Init()
- (#) Configure NVIC IRQ channel mapped to the EXTI line using NVIC_Init()
-
- [..]
- (@) SYSCFG APB clock must be enabled to get write access to SYSCFG_EXTICRx
- registers using RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE);
-
-@endverbatim
- *
- ******************************************************************************
- * @attention
- *
- * <h2><center>&copy; COPYRIGHT 2013 STMicroelectronics</center></h2>
- *
- * Licensed under MCD-ST Liberty SW License Agreement V2, (the "License");
- * You may not use this file except in compliance with the License.
- * You may obtain a copy of the License at:
- *
- * http://www.st.com/software_license_agreement_liberty_v2
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- *
- ******************************************************************************
- */
-
-/* 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)
-{
- 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 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 STMicroelectronics *****END OF FILE****/
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