int0_api.c

来自「ARM9系列,s3c2410实验代码」· C语言 代码 · 共 58 行

/*
 *	int0_api.c   -  int0 api ( user-level )
 *	
 *	Author: 	li ming <[e-mail]>
 *	Date:		2005-6-12
 *	Copyleft:	http://www.lumit.org
 */
 
#include "int0_api.h"

extern int request_irq( unsigned int irq, void (*handler)(void) );

static void (*int0_irq_hooker)(void) = 0;

void int0_irq_handler( void )
{
	// here we add some user code for int0_irq
	if( int0_irq_hooker )
		int0_irq_hooker();

	// here we call low-level int0_irq_handler
	int0_ioctl( INT0_CLEAR_INTERRUPT, 0 );
	
	return;
}

void int0_install_irq_hooker( void (*handler)(void) )
{
	int0_irq_hooker = handler;
}


/* set int0 related gpio */
int int0_init( void )
{
	// External interrupt 0 source number is 0
	request_irq( 0, int0_irq_handler );

	int0_open();

	// set int0 interrupt edge detect
	int0_ioctl( INT0_RISING_EDGE_INTERRUPT, 0 );
	
	// enable int0 interrupt
	int0_ioctl( INT0_ENABLE_INTERRUPT, 0 );

	// set active high
	int0_ioctl( INT0_ACTIVE_HIGH, 0 );
	
	return 0;
}

int int0_test( void )
{	
	int0_init();
	
	return 0;
}