mbed library sources
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Diff: targets/cmsis/TARGET_STM/TARGET_NUCLEO_F302R8/stm32f30x_exti.c
- Revision:
- 125:23cc3068a9e4
diff -r 73383cc04afd -r 23cc3068a9e4 targets/cmsis/TARGET_STM/TARGET_NUCLEO_F302R8/stm32f30x_exti.c --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/targets/cmsis/TARGET_STM/TARGET_NUCLEO_F302R8/stm32f30x_exti.c Wed Mar 19 10:15:22 2014 +0000 @@ -0,0 +1,359 @@ +/** + ****************************************************************************** + * @file stm32f30x_exti.c + * @author MCD Application Team + * @version V1.1.0 + * @date 27-February-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 + (#) EXTI line 17 is connected to the RTC Alarm event + (#) EXTI line 18 is connected to USB Device wakeup event + (#) EXTI line 19 is connected to the RTC Tamper and TimeStamp events + (#) EXTI line 20 is connected to the RTC wakeup event + (#) EXTI line 21 is connected to the Comparator 1 wakeup event + (#) EXTI line 22 is connected to the Comparator 2 wakeup event + (#) EXTI line 23 is connected to the I2C1 wakeup event + (#) EXTI line 24 is connected to the I2C2 wakeup event + (#) EXTI line 25 is connected to the USART1 wakeup event + (#) EXTI line 26 is connected to the USART2 wakeup event + (#) EXTI line 27 is reserved + (#) EXTI line 28 is connected to the USART3 wakeup event + (#) EXTI line 29 is connected to the Comparator 3 event + (#) EXTI line 30 is connected to the Comparator 4 event + (#) EXTI line 31 is connected to the Comparator 5 event + (#) EXTI line 32 is connected to the Comparator 6 event + (#) EXTI line 33 is connected to the Comparator 7 event + (#) EXTI line 34 is connected for thr UART4 wakeup event + (#) EXTI line 35 is connected for the UART5 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(). 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(c) 2014 STMicroelectronics</center></h2> + * + * Redistribution and use in source and binary forms, with or without modification, + * are permitted provided that the following conditions are met: + * 1. Redistributions of source code must retain the above copyright notice, + * this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright notice, + * this list of conditions and the following disclaimer in the documentation + * and/or other materials provided with the distribution. + * 3. Neither the name of STMicroelectronics nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" + * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE + * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR + * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER + * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, + * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + ****************************************************************************** + */ + +/* Includes ------------------------------------------------------------------*/ +#include "stm32f30x_exti.h" + +/** @addtogroup STM32F30x_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 = 0x1F800000; + EXTI->EMR = 0x00000000; + EXTI->RTSR = 0x00000000; + EXTI->FTSR = 0x00000000; + EXTI->SWIER = 0x00000000; + EXTI->PR = 0xE07FFFFF; + EXTI->IMR2 = 0x0000000C; + EXTI->EMR2 = 0x00000000; + EXTI->RTSR2 = 0x00000000; + EXTI->FTSR2 = 0x00000000; + EXTI->SWIER2 = 0x00000000; + EXTI->PR2 = 0x00000003; +} + +/** + * @brief Initializes the EXTI peripheral according to the specified + * parameters in the EXTI_InitStruct. + * EXTI_Line specifies the EXTI line (EXTI0....EXTI35). + * EXTI_Mode specifies which EXTI line is used as interrupt or an event. + * EXTI_Trigger selects the trigger. When the trigger occurs, interrupt + * pending bit will be set. + * EXTI_LineCmd controls (Enable/Disable) the EXTI line. + * @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_ALL(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 */ + *(__IO uint32_t *) (((uint32_t) &(EXTI->IMR)) + ((EXTI_InitStruct->EXTI_Line) >> 5 ) * 0x20) &= ~(uint32_t)(1 << (EXTI_InitStruct->EXTI_Line & 0x1F)); + *(__IO uint32_t *) (((uint32_t) &(EXTI->EMR)) + ((EXTI_InitStruct->EXTI_Line) >> 5 ) * 0x20) &= ~(uint32_t)(1 << (EXTI_InitStruct->EXTI_Line & 0x1F)); + + tmp += EXTI_InitStruct->EXTI_Mode + (((EXTI_InitStruct->EXTI_Line) >> 5 ) * 0x20); + + *(__IO uint32_t *) tmp |= (uint32_t)(1 << (EXTI_InitStruct->EXTI_Line & 0x1F)); + + tmp = (uint32_t)EXTI_BASE; + + /* Clear Rising Falling edge configuration */ + *(__IO uint32_t *) (((uint32_t) &(EXTI->RTSR)) + ((EXTI_InitStruct->EXTI_Line) >> 5 ) * 0x20) &= ~(uint32_t)(1 << (EXTI_InitStruct->EXTI_Line & 0x1F)); + *(__IO uint32_t *) (((uint32_t) &(EXTI->FTSR)) + ((EXTI_InitStruct->EXTI_Line) >> 5 ) * 0x20) &= ~(uint32_t)(1 << (EXTI_InitStruct->EXTI_Line & 0x1F)); + + /* Select the trigger for the selected interrupts */ + if (EXTI_InitStruct->EXTI_Trigger == EXTI_Trigger_Rising_Falling) + { + /* Rising Falling edge */ + *(__IO uint32_t *) (((uint32_t) &(EXTI->RTSR)) + ((EXTI_InitStruct->EXTI_Line) >> 5 ) * 0x20) |= (uint32_t)(1 << (EXTI_InitStruct->EXTI_Line & 0x1F)); + *(__IO uint32_t *) (((uint32_t) &(EXTI->FTSR)) + ((EXTI_InitStruct->EXTI_Line) >> 5 ) * 0x20) |= (uint32_t)(1 << (EXTI_InitStruct->EXTI_Line & 0x1F)); + } + else + { + tmp += EXTI_InitStruct->EXTI_Trigger + (((EXTI_InitStruct->EXTI_Line) >> 5 ) * 0x20); + + *(__IO uint32_t *) tmp |= (uint32_t)(1 << (EXTI_InitStruct->EXTI_Line & 0x1F)); + } + } + + else + { + tmp += EXTI_InitStruct->EXTI_Mode + (((EXTI_InitStruct->EXTI_Line) >> 5 ) * 0x20); + + /* Disable the selected external lines */ + *(__IO uint32_t *) tmp &= ~(uint32_t)(1 << (EXTI_InitStruct->EXTI_Line & 0x1F)); + } + +} + +/** + * @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_Rising_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..20). + * @retval None + */ +void EXTI_GenerateSWInterrupt(uint32_t EXTI_Line) +{ + /* Check the parameters */ + assert_param(IS_EXTI_LINE_EXT(EXTI_Line)); + + *(__IO uint32_t *) (((uint32_t) &(EXTI->SWIER)) + ((EXTI_Line) >> 5 ) * 0x20) |= (uint32_t)(1 << (EXTI_Line & 0x1F)); + +} + +/** + * @} + */ + +/** @defgroup EXTI_Group2 Interrupts and flags management functions + * @brief EXTI Interrupts and flags management functions + * +@verbatim + =============================================================================== + ##### Interrupts and flags management functions ##### + =============================================================================== + [..] + This section provides functions allowing to configure the EXTI Interrupts + sources and check or clear the flags or pending bits status. + +@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 any combination of EXTI_Linex where x can be (0..20). + * @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 ((*(__IO uint32_t *) (((uint32_t) &(EXTI->PR)) + ((EXTI_Line) >> 5 ) * 0x20)& (uint32_t)(1 << (EXTI_Line & 0x1F))) != (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..20). + * @retval None + */ +void EXTI_ClearFlag(uint32_t EXTI_Line) +{ + /* Check the parameters */ + assert_param(IS_EXTI_LINE_EXT(EXTI_Line)); + + *(__IO uint32_t *) (((uint32_t) &(EXTI->PR)) + ((EXTI_Line) >> 5 ) * 0x20) = (1 << (EXTI_Line & 0x1F)); +} + +/** + * @brief Checks whether the specified EXTI line is asserted or not. + * @param EXTI_Line: specifies the EXTI line to check. + * This parameter can be any combination of EXTI_Linex where x can be (0..20). + * @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 ((*(__IO uint32_t *) (((uint32_t) &(EXTI->PR)) + ((EXTI_Line) >> 5 ) * 0x20)& (uint32_t)(1 << (EXTI_Line & 0x1F))) != (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..20). + * @retval None + */ +void EXTI_ClearITPendingBit(uint32_t EXTI_Line) +{ + /* Check the parameters */ + assert_param(IS_EXTI_LINE_EXT(EXTI_Line)); + + *(__IO uint32_t *) (((uint32_t) &(EXTI->PR)) + ((EXTI_Line) >> 5 ) * 0x20) = (1 << (EXTI_Line & 0x1F)); +} + +/** + * @} + */ + +/** + * @} + */ + +/** + * @} + */ + +/** + * @} + */ + +/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/