AMiRo-OS

/**

  ******************************************************************************

  * @file    stm32f4xx_exti.c

  * @author  MCD Application Team

  * @version V1.1.0

  * @date    11-January-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)

{

  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****/