www.pudn.com > Audio.rar > stm32f10x_exti.c, change:2008-07-05,size:8742b


/******************** (C) COPYRIGHT 2008 STMicroelectronics ******************** 
* File Name          : stm32f10x_exti.c 
* Author             : MCD Application Team 
* Version            : V2.0.1 
* Date               : 06/13/2008 
* 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 EXTIís 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 EXTIís 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****/