rt-thread/bsp/nxp/lpc/lpc408x/Libraries/Drivers/source/lpc_exti.c

/**********************************************************************
* $Id$      lpc_exti.c          2011-06-02
*//**
* @file     lpc_exti.c
* @brief    Contains all functions support for External Interrupt
*           firmware library on LPC
* @version  1.0
* @date     02. June. 2011
* @author   NXP MCU SW Application Team
* 
* Copyright(C) 2011, NXP Semiconductor
* All rights reserved.
*
***********************************************************************
* Software that is described herein is for illustrative purposes only
* which provides customers with programming information regarding the
* products. This software is supplied "AS IS" without any warranties.
* NXP Semiconductors assumes no responsibility or liability for the
* use of the software, conveys no license or title under any patent,
* copyright, or mask work right to the product. NXP Semiconductors
* reserves the right to make changes in the software without
* notification. NXP Semiconductors also make no representation or
* warranty that such application will be suitable for the specified
* use without further testing or modification.
* Permission to use, copy, modify, and distribute this software and its
* documentation is hereby granted, under NXP Semiconductors'
* relevant copyright in the software, without fee, provided that it
* is used in conjunction with NXP Semiconductors microcontrollers.  This
* copyright, permission, and disclaimer notice must appear in all copies of
* this code.
**********************************************************************/

/* Peripheral group ----------------------------------------------------------- */
/** @addtogroup EXTI
 * @{
 */
#ifdef __BUILD_WITH_EXAMPLE__
#include "lpc_libcfg.h"
#else
#include "lpc_libcfg_default.h"
#endif /* __BUILD_WITH_EXAMPLE__ */
#ifdef _EXTI

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

/* Public Functions ----------------------------------------------------------- */
/** @addtogroup EXTI_Public_Functions
 * @{
 */

/*********************************************************************//**
 * @brief       Initial for EXT
 *              - Set EXTINT, EXTMODE, EXTPOLAR registers to default value
 * @param[in]   None
 * @return      None
 **********************************************************************/
void EXTI_Init(void)
{
    LPC_SC->EXTINT = 0xF;
    LPC_SC->EXTMODE = 0x0;
    LPC_SC->EXTPOLAR = 0x0;
}


/*********************************************************************//**
* @brief        Close EXT
* @param[in]    None
* @return       None
**********************************************************************/
void    EXTI_DeInit(void)
{
    ;
}

/*********************************************************************//**
 * @brief       Configuration for EXT
 *              - Set EXTINT, EXTMODE, EXTPOLAR register
 * @param[in]   EXTICfg Pointer to a EXTI_InitTypeDef structure
 *              that contains the configuration information for the
 *              specified external interrupt
 * @return      None
 **********************************************************************/
void EXTI_Config(EXTI_InitTypeDef *EXTICfg)
{
    LPC_SC->EXTINT = 0x0;
    EXTI_SetMode(EXTICfg->EXTI_Line, EXTICfg->EXTI_Mode);
    EXTI_SetPolarity(EXTICfg->EXTI_Line, EXTICfg->EXTI_polarity);
}

/*********************************************************************//**
* @brief        Set mode for EXTI pin
* @param[in]    EXTILine     external interrupt line, should be:
*               - EXTI_EINT0: external interrupt line 0
*               - EXTI_EINT1: external interrupt line 1
*               - EXTI_EINT2: external interrupt line 2
*               - EXTI_EINT3: external interrupt line 3
* @param[in]    mode    external mode, should be:
*               - EXTI_MODE_LEVEL_SENSITIVE
*               - EXTI_MODE_EDGE_SENSITIVE
* @return       None
*********************************************************************/
void EXTI_SetMode(EXTI_LINE_ENUM EXTILine, EXTI_MODE_ENUM mode)
{
    if(mode == EXTI_MODE_EDGE_SENSITIVE)
    {
        LPC_SC->EXTMODE |= (1 << EXTILine);
    }
    else if(mode == EXTI_MODE_LEVEL_SENSITIVE)
    {
        LPC_SC->EXTMODE &= ~(1 << EXTILine);
    }
}

/*********************************************************************//**
* @brief        Set polarity for EXTI pin
* @param[in]    EXTILine     external interrupt line, should be:
*               - EXTI_EINT0: external interrupt line 0
*               - EXTI_EINT1: external interrupt line 1
*               - EXTI_EINT2: external interrupt line 2
*               - EXTI_EINT3: external interrupt line 3
* @param[in]    polarity     external polarity value, should be:
*               - EXTI_POLARITY_LOW_ACTIVE_OR_FALLING_EDGE
*               - EXTI_POLARITY_LOW_ACTIVE_OR_FALLING_EDGE
* @return       None
*********************************************************************/
void EXTI_SetPolarity(EXTI_LINE_ENUM EXTILine, EXTI_POLARITY_ENUM polarity)
{
    if(polarity == EXTI_POLARITY_HIGH_ACTIVE_OR_RISING_EDGE)
    {
        LPC_SC->EXTPOLAR |= (1 << EXTILine);
    }
    else if(polarity == EXTI_POLARITY_LOW_ACTIVE_OR_FALLING_EDGE)
    {
        LPC_SC->EXTPOLAR &= ~(1 << EXTILine);
    }
}

/*********************************************************************//**
* @brief        Clear External interrupt flag
* @param[in]    EXTILine     external interrupt line, should be:
*               - EXTI_EINT0: external interrupt line 0
*               - EXTI_EINT1: external interrupt line 1
*               - EXTI_EINT2: external interrupt line 2
*               - EXTI_EINT3: external interrupt line 3
* @return       None
*********************************************************************/
void EXTI_ClearEXTIFlag(EXTI_LINE_ENUM EXTILine)
{
        LPC_SC->EXTINT |= (1 << EXTILine);
}

/**
 * @}
 */
#endif /*_EXTI*/
/**
 * @}
 */

/* --------------------------------- End Of File ------------------------------ */