adc.c

ep7312- ad转换的源码

/*
 * $Id: adc.c,v 1.2 2003/08/29 03:04:55 casic Exp $
 *
 * adc.c : adc driver
 *
 * Copyright (C) 2003 ynding ( [e-mail] )
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 */

#include "adc.h"
#include "wait.h"
#include "ep7312.h"

/* ADC conversion */
unsigned char adc(void)
{
	unsigned int adc_value;

	rMEMCFG2 &= 0xffffff00;
	rMEMCFG2 |= 0x00000000;

	ADC_ADDR = 0x00;
		
	wait(1);

	adc_value = ADC_ADDR;

	return (unsigned char)adc_value & 0xff;
}

/* AD samples */
void adc_sample(int interval)
{
	unsigned char adc_value;

	unsigned char adc_data[24] = {0};

	int i = 0;
	

	while ( 1 ) {

		adc_value = adc();
		adc_data[i%24] = adc_value;

		++i;
		wait(interval);
	}

	return;
}