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172 lines
5.7 KiB
C
172 lines
5.7 KiB
C
8 years ago
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/**********************************************************************
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* $Id$ lpc17xx_exti.c 2010-06-18
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*//**
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* @file lpc17xx_exti.c
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* @brief Contains all functions support for External interrupt firmware
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* library on LPC17xx
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* @version 3.0
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* @date 18. June. 2010
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* @author NXP MCU SW Application Team
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*
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* Copyright(C) 2010, NXP Semiconductor
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* All rights reserved.
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*
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***********************************************************************
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* Software that is described herein is for illustrative purposes only
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* which provides customers with programming information regarding the
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* products. This software is supplied "AS IS" without any warranties.
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* NXP Semiconductors assumes no responsibility or liability for the
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* use of the software, conveys no license or title under any patent,
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* copyright, or mask work right to the product. NXP Semiconductors
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* reserves the right to make changes in the software without
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* notification. NXP Semiconductors also make no representation or
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* warranty that such application will be suitable for the specified
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* use without further testing or modification.
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* Permission to use, copy, modify, and distribute this software and its
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* documentation is hereby granted, under NXP Semiconductors'
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* relevant copyright in the software, without fee, provided that it
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* is used in conjunction with NXP Semiconductors microcontrollers. This
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* copyright, permission, and disclaimer notice must appear in all copies of
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* this code.
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**********************************************************************/
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/* Peripheral group ----------------------------------------------------------- */
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/** @addtogroup EXTI
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* @{
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*/
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/* Includes ------------------------------------------------------------------- */
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#include "lpc17xx_exti.h"
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/* If this source file built with example, the LPC17xx FW library configuration
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* file in each example directory ("lpc17xx_libcfg.h") must be included,
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* otherwise the default FW library configuration file must be included instead
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*/
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#ifdef __BUILD_WITH_EXAMPLE__
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#include "lpc17xx_libcfg.h"
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#else
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#include "lpc17xx_libcfg_default.h"
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#endif /* __BUILD_WITH_EXAMPLE__ */
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#ifdef _EXTI
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/* Public Functions ----------------------------------------------------------- */
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/** @addtogroup EXTI_Public_Functions
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* @{
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*/
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/*********************************************************************//**
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* @brief Initial for EXT
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* - Set EXTINT, EXTMODE, EXTPOLAR registers to default value
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* @param[in] None
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* @return None
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**********************************************************************/
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void EXTI_Init(void)
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{
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LPC_SC->EXTINT = 0xF;
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LPC_SC->EXTMODE = 0x0;
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LPC_SC->EXTPOLAR = 0x0;
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}
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/*********************************************************************//**
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* @brief Close EXT
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* @param[in] None
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* @return None
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**********************************************************************/
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void EXTI_DeInit(void)
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{
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;
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}
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/*********************************************************************//**
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* @brief Configuration for EXT
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* - Set EXTINT, EXTMODE, EXTPOLAR register
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* @param[in] EXTICfg Pointer to a EXTI_InitTypeDef structure
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* that contains the configuration information for the
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* specified external interrupt
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* @return None
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**********************************************************************/
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void EXTI_Config(EXTI_InitTypeDef *EXTICfg)
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{
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LPC_SC->EXTINT = 0x0;
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EXTI_SetMode(EXTICfg->EXTI_Line, EXTICfg->EXTI_Mode);
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EXTI_SetPolarity(EXTICfg->EXTI_Line, EXTICfg->EXTI_polarity);
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}
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/*********************************************************************//**
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* @brief Set mode for EXTI pin
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* @param[in] EXTILine external interrupt line, should be:
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* - EXTI_EINT0: external interrupt line 0
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* - EXTI_EINT1: external interrupt line 1
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* - EXTI_EINT2: external interrupt line 2
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* - EXTI_EINT3: external interrupt line 3
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* @param[in] mode external mode, should be:
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* - EXTI_MODE_LEVEL_SENSITIVE
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* - EXTI_MODE_EDGE_SENSITIVE
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* @return None
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*********************************************************************/
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void EXTI_SetMode(EXTI_LINE_ENUM EXTILine, EXTI_MODE_ENUM mode)
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{
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if(mode == EXTI_MODE_EDGE_SENSITIVE)
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{
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LPC_SC->EXTMODE |= (1 << EXTILine);
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}
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else if(mode == EXTI_MODE_LEVEL_SENSITIVE)
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{
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LPC_SC->EXTMODE &= ~(1 << EXTILine);
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}
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}
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/*********************************************************************//**
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* @brief Set polarity for EXTI pin
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* @param[in] EXTILine external interrupt line, should be:
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* - EXTI_EINT0: external interrupt line 0
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* - EXTI_EINT1: external interrupt line 1
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* - EXTI_EINT2: external interrupt line 2
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* - EXTI_EINT3: external interrupt line 3
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* @param[in] polarity external polarity value, should be:
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* - EXTI_POLARITY_LOW_ACTIVE_OR_FALLING_EDGE
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* - EXTI_POLARITY_LOW_ACTIVE_OR_FALLING_EDGE
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* @return None
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*********************************************************************/
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void EXTI_SetPolarity(EXTI_LINE_ENUM EXTILine, EXTI_POLARITY_ENUM polarity)
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{
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if(polarity == EXTI_POLARITY_HIGH_ACTIVE_OR_RISING_EDGE)
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{
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LPC_SC->EXTPOLAR |= (1 << EXTILine);
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}
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else if(polarity == EXTI_POLARITY_LOW_ACTIVE_OR_FALLING_EDGE)
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{
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LPC_SC->EXTPOLAR &= ~(1 << EXTILine);
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}
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}
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/*********************************************************************//**
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* @brief Clear External interrupt flag
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* @param[in] EXTILine external interrupt line, should be:
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* - EXTI_EINT0: external interrupt line 0
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* - EXTI_EINT1: external interrupt line 1
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* - EXTI_EINT2: external interrupt line 2
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* - EXTI_EINT3: external interrupt line 3
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* @return None
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*********************************************************************/
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void EXTI_ClearEXTIFlag(EXTI_LINE_ENUM EXTILine)
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{
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LPC_SC->EXTINT = (1 << EXTILine);
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}
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/**
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* @}
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*/
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#endif /* _EXTI */
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/**
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* @}
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*/
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/* --------------------------------- End Of File ------------------------------ */
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