/******************** (C) COPYRIGHT 2008 STMicroelectronics ********************
* File Name          : stm32f10x_exti.c
* Author             : MCD Application Team
* Version            : V2.0.3
* Date               : 09/22/2008
* Description        : This file provides all the EXTI firmware functions.
********************************************************************************
* THE PRESENT FIRMWARE 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 FIRMWARE 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_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));
     
  if (EXTI_InitStruct->EXTI_LineCmd != DISABLE)
  {
    /* Clear EXTI line configuration */
    EXTI->IMR &= ~EXTI_InitStruct->EXTI_Line;
    EXTI->EMR &= ~EXTI_InitStruct->EXTI_Line;
    
    *(vu32 *)(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
    {
      *(vu32 *)(EXTI_BASE + (u32)EXTI_InitStruct->EXTI_Trigger)|= EXTI_InitStruct->EXTI_Line;
    }
  }
  else
  {
    /* Disable the selected external lines */
    *(vu32 *)(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 any combination of EXTI_Linex where 
*                    x can be (0..18).
* Output         : None
* Return         : None
*******************************************************************************/
void EXTI_GenerateSWInterrupt(u32 EXTI_Line)
{
  /* Check the parameters */
  assert_param(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 line 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_param(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 any combination of EXTI_Linex where 
*                    x can be (0..18).
* Output         : None
* Return         : None
*******************************************************************************/
void EXTI_ClearFlag(u32 EXTI_Line)
{
  /* Check the parameters */
  assert_param(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 line 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_param(IS_GET_EXTI_LINE(EXTI_Line));
  
  enablestatus =  EXTI->IMR & EXTI_Line;

  if (((EXTI->PR & EXTI_Line) != (u32)RESET) && (enablestatus != (u32)RESET))
  {
    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 any combination of EXTI_Linex where 
*                    x can be (0..18).
* Output         : None
* Return         : None
*******************************************************************************/
void EXTI_ClearITPendingBit(u32 EXTI_Line)
{
  /* Check the parameters */
  assert_param(IS_EXTI_LINE(EXTI_Line));
  
  EXTI->PR = EXTI_Line;
}

/******************* (C) COPYRIGHT 2008 STMicroelectronics *****END OF FILE****/
