313 lines
10 KiB
C
313 lines
10 KiB
C
/**
|
|
******************************************************************************
|
|
* @file stm32f2xx_exti.c
|
|
* @author MCD Application Team
|
|
* @version V1.1.2
|
|
* @date 05-March-2012
|
|
* @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:
|
|
* 1- All available GPIO pins are connected to the 16 external
|
|
* interrupt/event lines from EXTI0 to EXTI15.
|
|
* 2- EXTI line 16 is connected to the PVD Output
|
|
* 3- EXTI line 17 is connected to the RTC Alarm event
|
|
* 4- EXTI line 18 is connected to the USB OTG FS Wakeup from suspend event
|
|
* 5- EXTI line 19 is connected to the Ethernet Wakeup event
|
|
* 6- EXTI line 20 is connected to the USB OTG HS (configured in FS) Wakeup event
|
|
* 7- EXTI line 21 is connected to the RTC Tamper and Time Stamp events
|
|
* 8- 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:
|
|
* 1- Configure the I/O in input mode using GPIO_Init()
|
|
* 2- Select the input source pin for the EXTI line using SYSCFG_EXTILineConfig()
|
|
* 3- Select the mode(interrupt, event) and configure the trigger
|
|
* selection (Rising, falling or both) using EXTI_Init()
|
|
* 4- Configure NVIC IRQ channel mapped to the EXTI line using NVIC_Init()
|
|
*
|
|
* @note 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 2012 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 "stm32f2xx_exti.h"
|
|
|
|
/** @addtogroup STM32F2xx_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)
|
|
{
|
|
ITStatus bitstatus = RESET;
|
|
uint32_t enablestatus = 0;
|
|
/* Check the parameters */
|
|
assert_param(IS_GET_EXTI_LINE(EXTI_Line));
|
|
|
|
enablestatus = EXTI->IMR & EXTI_Line;
|
|
if (((EXTI->PR & EXTI_Line) != (uint32_t)RESET) && (enablestatus != (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****/
|