dip4_api.c

ARM9系列,s3c2410实验代码

/*
 *	dip4_api.c   -  dip4 api ( user-level )
 *	
 *	Author: 	li ming <[e-mail]>
 *	Date:		2005-6-11
 *	Copyleft:	http://www.lumit.org
 */
 
#include "dip4_driver.h"


/* set dip4 related gpio */
int dip4_init( void )
{
	dip4_open();
	return 0;
}

/* get 4 dip4s status to low-4-bits of hex value */
int dip4_get_value( void )
{
	char buf[DIP4_NUM];
	int value = 0;
	int i;

	// read the dip status from dip4 driver
	dip4_read( buf, DIP4_NUM ); 

	for( i = 0; i < DIP4_NUM; i++ )
		value = value | (buf[i] << i);
	
	// return the dip4 status in low-bits of value
	return value;
}

int dip4_test( void )
{	
	int value;
	
	dip4_init();
	
	while(1)
	{	
		value = dip4_get_value();	
	}
	
	return 0;
}