/** ****************************************************************************** * @file stm32f0xx_exti.c * @author MCD Application Team * @version V1.5.0 * @date 05-December-2014 * @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, not applicable for STM32F030 devices. (#) EXTI line 17 is connected to the RTC Alarm event. (#) EXTI line 18 is connected to the RTC Alarm event, applicable only for STM32F072 devices. (#) EXTI line 19 is connected to the RTC Tamper and TimeStamp events. (#) EXTI line 20 is connected to the RTC wakeup event, applicable only for STM32F072 devices. (#) EXTI line 21 is connected to the Comparator 1 wakeup event, applicable only for STM32F051 and STM32F072 devices. (#) EXTI line 22 is connected to the Comparator 2 wakeup event, applicable only for STM32F051 and STM32F072 devices. (#) EXTI line 23 is connected to the I2C1 wakeup event, not applicable for STM32F030 devices. (#) EXTI line 25 is connected to the USART1 wakeup event, not applicable for STM32F030 devices. (#) EXTI line 26 is connected to the USART2 wakeup event, applicable only for STM32F072 devices. (#) EXTI line 27 is connected to the CEC wakeup event, applicable only for STM32F051 and STM32F072 devices. (#) EXTI line 31 is connected to the VDD USB monitor event, applicable only for STM32F072 devices. ##### 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(). For the internal interrupt, the trigger selection is not needed( the active edge is always the rising one). (#) Configure NVIC IRQ channel mapped to the EXTI line using NVIC_Init(). (#) Optionally, you can generate a software interrupt using the function EXTI_GenerateSWInterrupt(). [..] (@) SYSCFG APB clock must be enabled to get write access to SYSCFG_EXTICRx registers using RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE); @endverbatim * ****************************************************************************** * @attention * *

© COPYRIGHT 2014 STMicroelectronics

* * 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 "stm32f0xx_exti.h" /** @addtogroup STM32F0xx_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 = 0x0F940000; EXTI->EMR = 0x00000000; EXTI->RTSR = 0x00000000; EXTI->FTSR = 0x00000000; EXTI->PR = 0x006BFFFF; } /** * @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 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..27). * @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..27). * @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..27). * @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..27). * @retval The new state of EXTI_Line (SET or RESET). */ ITStatus EXTI_GetITStatus(uint32_t EXTI_Line) { ITStatus 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..27). * @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****/