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/**
* @file lpc17xx_exti.c
* @brief Contains all functions support for External interrupt firmware library on LPC17xx
* @version 3.0
* @date 18. June. 2010
* @author NXP MCU SW Application Team
**************************************************************************
* 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.
**********************************************************************/
/* Peripheral group ----------------------------------------------------------- */
/** @addtogroup EXTI
* @{
*/
/* Includes ------------------------------------------------------------------- */
#include "lpc17xx_exti.h"
/* If this source file built with example, the LPC17xx FW library configuration
* file in each example directory ("lpc17xx_libcfg.h") must be included,
* otherwise the default FW library configuration file must be included instead
*/
#ifdef __BUILD_WITH_EXAMPLE__
#include "lpc17xx_libcfg.h"
#else
#include "lpc17xx_libcfg_default.h"
#endif /* __BUILD_WITH_EXAMPLE__ */
#ifdef _EXTI
/* 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 ------------------------------ */
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