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Diff: targets/cmsis/TARGET_STM/TARGET_NUCLEO_F030R8/stm32f0xx_exti.c
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/targets/cmsis/TARGET_STM/TARGET_NUCLEO_F030R8/stm32f0xx_exti.c Mon Jan 27 14:30:07 2014 +0000 @@ -0,0 +1,314 @@ +/** + ****************************************************************************** + * @file stm32f0xx_exti.c + * @author MCD Application Team + * @version V1.3.0 + * @date 16-January-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 + * + * <h2><center>© COPYRIGHT 2014 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 "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****/