Subversion Repositories openrisc_2011-10-31

/******************** (C) COPYRIGHT 2007 STMicroelectronics ********************

* File Name          : stm32f10x_exti.c

* Author             : MCD Application Team

* Date First Issued  : 09/29/2006

* Description        : This file provides all the EXTI firmware functions.

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

* History:

* 04/02/2007: V0.2

* 02/05/2007: V0.1

* 09/29/2006: V0.01

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

* THE PRESENT SOFTWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS

* WITH CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE TIME.

* AS A RESULT, STMICROELECTRONICS SHALL NOT BE HELD LIABLE FOR ANY DIRECT,

* INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING FROM THE

* CONTENT OF SUCH SOFTWARE AND/OR THE USE MADE BY CUSTOMERS OF THE CODING

* INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS.

*******************************************************************************/

/* Includes ------------------------------------------------------------------*/

#include "stm32f10x_exti.h"

/* Private typedef -----------------------------------------------------------*/

/* Private define ------------------------------------------------------------*/

#define EXTI_LineNone    ((u32)0x00000)  /* No interrupt selected */

/* Private macro -------------------------------------------------------------*/

/* Private variables ---------------------------------------------------------*/

/* Private function prototypes -----------------------------------------------*/

/* Private functions ---------------------------------------------------------*/

/*******************************************************************************

* Function Name  : EXTI_DeInit

* Description    : Deinitializes the EXTI peripheral registers to their default

*                  reset values.

* Input          : None

* Output         : None

* Return         : None

*******************************************************************************/

void EXTI_DeInit(void)

{

  EXTI->IMR = 0x00000000;

  EXTI->EMR = 0x00000000;

  EXTI->RTSR = 0x00000000;

  EXTI->FTSR = 0x00000000;

  EXTI->PR = 0x0007FFFF;

}

/*******************************************************************************

* Function Name  : EXTI_Init

* Description    : Initializes the EXTI peripheral according to the specified

*                  parameters in the EXTI_InitStruct.

* Input          : - EXTI_InitStruct: pointer to a EXTI_InitTypeDef structure

*                    that contains the configuration information for the EXTI

*                    peripheral.

* Output         : None

* Return         : None

*******************************************************************************/

void EXTI_Init(EXTI_InitTypeDef* EXTI_InitStruct)

{

  /* Check the parameters */

  assert(IS_EXTI_MODE(EXTI_InitStruct->EXTI_Mode));

  assert(IS_EXTI_TRIGGER(EXTI_InitStruct->EXTI_Trigger));

  assert(IS_EXTI_LINE(EXTI_InitStruct->EXTI_Line));

  assert(IS_FUNCTIONAL_STATE(EXTI_InitStruct->EXTI_LineCmd));

  if (EXTI_InitStruct->EXTI_LineCmd != DISABLE)

  {

    *(u32 *)(EXTI_BASE + (u32)EXTI_InitStruct->EXTI_Mode)|= 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

    {

      *(u32 *)(EXTI_BASE + (u32)EXTI_InitStruct->EXTI_Trigger)|= EXTI_InitStruct->EXTI_Line;

    }

  }

  else

  {

    /* Disable the selected external lines */

    *(u32 *)(EXTI_BASE + (u32)EXTI_InitStruct->EXTI_Mode)&= ~EXTI_InitStruct->EXTI_Line;

  }

}

/*******************************************************************************

* Function Name  : EXTI_StructInit

* Description    : Fills each EXTI_InitStruct member with its reset value.

* Input          : - EXTI_InitStruct: pointer to a EXTI_InitTypeDef structure

*                    which will be initialized.

* Output         : None

* Return         : 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;

}

/*******************************************************************************

* Function Name  : EXTI_GenerateSWInterrupt

* Description    : Generates a Software interrupt.

* Input          : - EXTI_Line: specifies the EXTI lines to be enabled or

*                    disabled.

*                    This parameter can be:

*                       - EXTI_Linex: External interrupt line x where x(0..18)

* Output         : None

* Return         : None

*******************************************************************************/

void EXTI_GenerateSWInterrupt(u32 EXTI_Line)

{

  /* Check the parameters */

  assert(IS_EXTI_LINE(EXTI_Line));

  EXTI->SWIER |= EXTI_Line;

}

/*******************************************************************************

* Function Name  : EXTI_GetFlagStatus

* Description    : Checks whether the specified EXTI line flag is set or not.

* Input          : - EXTI_Line: specifies the EXTI lines flag to check.

*                    This parameter can be:

*                       - EXTI_Linex: External interrupt line x where x(0..18)

* Output         : None

* Return         : The new state of EXTI_Line (SET or RESET).

*******************************************************************************/

FlagStatus EXTI_GetFlagStatus(u32 EXTI_Line)

{

  FlagStatus bitstatus = RESET;

  /* Check the parameters */

  assert(IS_GET_EXTI_LINE(EXTI_Line));

  if ((EXTI->PR & EXTI_Line) != (u32)RESET)

  {

    bitstatus = SET;

  }

  else

  {

    bitstatus = RESET;

  }

  return bitstatus;

}

/*******************************************************************************

* Function Name  : EXTI_ClearFlag

* Description    : Clears the EXTI’s line pending flags.

* Input          : - EXTI_Line: specifies the EXTI lines flags to clear.

*                    This parameter can be:

*                       - EXTI_Linex: External interrupt line x where x(0..18)

* Output         : None

* Return         : None

*******************************************************************************/

void EXTI_ClearFlag(u32 EXTI_Line)

{

  /* Check the parameters */

  assert(IS_EXTI_LINE(EXTI_Line));

  EXTI->PR = EXTI_Line;

}

/*******************************************************************************

* Function Name  : EXTI_GetITStatus

* Description    : Checks whether the specified EXTI line is asserted or not.

* Input          : - EXTI_Line: specifies the EXTI lines to check.

*                    This parameter can be:

*                       - EXTI_Linex: External interrupt line x where x(0..18)

* Output         : None

* Return         : The new state of EXTI_Line (SET or RESET).

*******************************************************************************/

ITStatus EXTI_GetITStatus(u32 EXTI_Line)

{

  ITStatus bitstatus = RESET;

  u32 enablestatus = 0;

  /* Check the parameters */

  assert(IS_GET_EXTI_LINE(EXTI_Line));

  enablestatus =  EXTI->IMR & EXTI_Line;

  if (((EXTI->PR & EXTI_Line) != (u32)RESET) && enablestatus)

  {

    bitstatus = SET;

  }

  else

  {

    bitstatus = RESET;

  }

  return bitstatus;

}

/*******************************************************************************

* Function Name  : EXTI_ClearITPendingBit

* Description    : Clears the EXTI’s line pending bits.

* Input          : - EXTI_Line: specifies the EXTI lines to clear.

*                    This parameter can be:

*                       - EXTI_Linex: External interrupt line x where x(0..18)

* Output         : None

* Return         : None

*******************************************************************************/

void EXTI_ClearITPendingBit(u32 EXTI_Line)

{

  /* Check the parameters */

  assert(IS_EXTI_LINE(EXTI_Line));

  EXTI->PR = EXTI_Line;

}

/******************* (C) COPYRIGHT 2007 STMicroelectronics *****END OF FILE****/