st79_exti.c

st公司新出的一款8位单片机st79的lib库

/**
  ******************************************************************************
  * @file st79_exti.c
  * @brief This file contains all the functions for the EXTI peripheral.
  * @author STMicroelectronics - MCD & APG Car Body Application Labs
  * @version V0.01
  * @date 04-JUL-2007
  ******************************************************************************
  *
  * 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.
  *
  * <h2><center>&copy; COPYRIGHT 2007 STMicroelectronics</center></h2>
  * @image html logo.bmp
  ******************************************************************************
  */

/* Includes ------------------------------------------------------------------*/
#include "st79_exti.h"

/* LINKER SECTIONS DEFINITION FOR THIS FILE ONLY */
#pragma section (EXTI_CODE)
#pragma section const {EXTI_CONST}
#pragma section @near [EXTI_URAM]
#pragma section @near {EXTI_IRAM}
#pragma section @tiny [EXTI_UZRAM]
#pragma section @tiny {EXTI_IZRAM}

/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
/* Private function prototypes -----------------------------------------------*/
/* Private functions ---------------------------------------------------------*/

/* Public functions ----------------------------------------------------------*/

/**
  * @addtogroup EXTI_Public_Functions
  * @{
  */


/**
  * @brief Deinitializes the external interrupt control registers to their default reset value.
  * @par Parameters:
  * None
  * @retval void None
  * @par Required preconditions:
  * None
  * @par Called functions:
  * None
  * @par Example:
  * @code
  * EXTI_DeInit();
  * @endcode
*/
void EXTI_DeInit(void)
{
  EXTI->CR1 = EXTI_CR1_RESET_VALUE;
  EXTI->CR2 = EXTI_CR2_RESET_VALUE;
}


/**
  * @brief Set the external interrupt sensitivity of the selected port.
  * @warning
  * - The modification of external interrupt sensitivity is only possible when the interrupts are disabled.
  * - The normal behavior is to disable the interrupts before calling this function, and re-enable them after.
  * @param[in] PortNum The port number to access.
  * @param[in] SensitivityValue The external interrupt sensitivity value to set.
  * @retval void None
  * @par Required preconditions:
  * Global interrupts must be disabled before calling this function.
  * @par Called functions:
  * None
  * @par Example:
  * @code
  * EXTI_SetExtIntSensitivity(EXTI_GPIOA, EXTI_FALL_ONLY);
  * @endcode
  */
void EXTI_SetExtIntSensitivity(EXTI_PortNum_TypeDef PortNum, EXTI_Sensitivity_TypeDef SensitivityValue)
{
  /* Check function parameters */
  assert(IS_EXTI_PORTNUM_OK(PortNum));
  assert(IS_EXTI_SENSITIVITY_VALUE_OK(SensitivityValue));

  /* Set external interrupt sensitivity */
  switch (PortNum)
  {
    case EXTI_GPIOA:
      EXTI->CR1 &= (u8)(~EXTI_CR1_PAIS);
      EXTI->CR1 |= (u8)(SensitivityValue);
      break;
    case EXTI_GPIOB:
      EXTI->CR1 &= (u8)(~EXTI_CR1_PBIS);
      EXTI->CR1 |= (u8)((u8)(SensitivityValue) << 2);
      break;
    case EXTI_GPIOC:
      EXTI->CR1 &= (u8)(~EXTI_CR1_PCIS);
      EXTI->CR1 |= (u8)((u8)(SensitivityValue) << 4);
      break;
    case EXTI_GPIOD:
      EXTI->CR1 &= (u8)(~EXTI_CR1_PDIS);
      EXTI->CR1 |= (u8)((u8)(SensitivityValue) << 6);
      break;
    case EXTI_GPIOE:
      EXTI->CR2 &= (u8)(~EXTI_CR2_PEIS);
      EXTI->CR2 |= (u8)(SensitivityValue);
      break;
    default:
      break;
  }
}


/**
  * @brief Set the TLI interrupt sensitivity.
  * @param[in] SensitivityValue The TLI interrupt sensitivity value.
  * @retval void None
  * @par Required preconditions:
  * Global interrupts must be disabled before calling this function.
  * @par Called functions:
  * None
  * @par Example:
  * @code
  * EXTI_SetTLISensitivity(EXTI_TLI_RISE_ONLY);
  * @endcode
  */
void EXTI_SetTLISensitivity(EXTI_TLISensitivity_TypeDef SensitivityValue)
{

  /* Check function parameters */
  assert(IS_EXTI_TLISENSITIVITY_VALUE_OK(SensitivityValue));

  /* Set TLI interrupt sensitivity */
  EXTI->CR2 &= (u8)(~EXTI_CR2_TLIE);
  EXTI->CR2 |= (u8)(SensitivityValue);

}


/**
  * @brief Get the external interrupt sensitivity of the selected port.
  * @param[in] PortNum The port number to access.
  * @retval EXTI_Sensitivity_TypeDef The external interrupt sensitivity of the selected port.
  * @par Required preconditions:
  * None
  * @par Called functions:
  * None
  * @par Example:
  * @code
  * EXTI_Sensitivity_TypeDef val;
  * val = EXTI_GetExtIntSensitivity(EXTI_GPIOA);
  * if (val == EXTI_RISE_ONLY) { ... }
  * @endcode
  */
EXTI_Sensitivity_TypeDef EXTI_GetExtIntSensitivity(EXTI_PortNum_TypeDef PortNum)
{

  u8 value = 0;

  /* Check function parameters */
  assert(IS_EXTI_PORTNUM_OK(PortNum));

  switch (PortNum)
  {
    case EXTI_GPIOA:
      value = (EXTI->CR1 & EXTI_CR1_PAIS);
      break;
    case EXTI_GPIOB:
      value = (EXTI->CR1 & EXTI_CR1_PBIS) >> 2;
      break;
    case EXTI_GPIOC:
      value = (EXTI->CR1 & EXTI_CR1_PCIS) >> 4;
      break;
    case EXTI_GPIOD:
      value = (EXTI->CR1 & EXTI_CR1_PDIS) >> 6;
      break;
    case EXTI_GPIOE:
      value = (EXTI->CR2 & EXTI_CR2_PEIS);
      break;
    default:
      break;
  }

  return((EXTI_Sensitivity_TypeDef)value);

}


/**
  * @brief Get the TLI interrupt sensitivity.
  * @par Parameters:
  * None
  * @retval EXTI_TLISensitivity_TypeDef The TLI interrupt sensitivity read.
  * @par Required preconditions:
  * None
  * @par Called functions:
  * None
  * @par Example:
  * @code
  * EXTI_Sensitivity_TypeDef val;
  * val = EXTI_GetTLISensitivity();
  * if (val == EXTI_TLI_FALL_ONLY) { ... }
  * @endcode
  */
EXTI_TLISensitivity_TypeDef EXTI_GetTLISensitivity(void)
{

  u8 value;

  /* Get TLI interrupt sensitivity */
  value = (EXTI->CR2 & EXTI_CR2_TLIE);

  return((EXTI_TLISensitivity_TypeDef)value);
}

/**
  * @}
  */

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