oscillograph.c

ep7312- ad转换的源码

/*
 * $Id: oscillograph.c,v 1.2 2003/08/29 03:13:17 casic Exp $
 *
 * oscillograhp.c : draw interface of oscillograph
 *
 * 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 "lcd.h"
#include "color.h"
#include "character.h"
#include "graphic.h"
#include "oscillograph.h"

/* draw an interface, which looks like an oscillograph */
void draw_interface(void)
{
	int i = 0;
	static flag = 0;

	if ( flag == 0 ) {
		clear_lcd();
		++flag;
	}

	display_string(6, 0, "CASIC Waveform Display", GREEN);
	display_string(0, 7, "0", GREEN);

	draw_rectangle(10, 20, 260, 220, GREEN);

	/* draw vertical dasheds */
	for ( i=0;i<9;++i ) {
		draw_vdashed(35+i*25, 20, 220, GREEN);
	}

	/* draw horizontal dasheds */
	for ( i=0;i<7;++i ) {
		draw_hdashed(10, 260, 45+i*25, GREEN);
	}

	/* draw vertical scales */
	/* left */
	draw_vdashed(11, 20, 220, GREEN);
	draw_vdashed(12, 20, 220, GREEN);

	/* middle */
	draw_vdashed(134, 20, 220, GREEN);
	draw_vdashed(135, 20, 220, GREEN);
	draw_vdashed(136, 20, 220, GREEN);

	/* right */
	draw_vdashed(258, 20, 220, GREEN);
	draw_vdashed(259, 20, 220, GREEN);

	/* draw horizontal scales */
	/* top */
	draw_hdashed(10, 260, 21, GREEN);
	draw_hdashed(10, 260, 22, GREEN);

	/* middle */
	draw_hdashed(10, 260, 119, GREEN);
	draw_hdashed(10, 260, 120, GREEN);
	draw_hdashed(10, 260, 121, GREEN);

	/* bottom */
	draw_hdashed(10, 260, 218, GREEN);
	draw_hdashed(10, 260, 219, GREEN);

	return;
}

/* convert datas to coordinates */
void data2pixel(unsigned char* buf, int count)
{
	unsigned char average = 0;

	unsigned char max = 0;
	unsigned char min = 0;

	int temp = 0;

	int i = 0;

	/* find out the max & min value */
	for ( i=0;i<count;++i ) {

		if ( min > buf[i])
		       min = buf[i];

		if ( max < buf[i])
		       max = buf[i];
	}

	/* calculate the middle value */
	average = max/2 + min/2;

	/* change data to coordinates */
	for ( i=0;i<count;++i ) {
		temp = (int)buf[i];
		temp -= (int)average;

		temp = temp*200/256;

		temp = 220 -100 - temp;

		buf[i] = (unsigned char)(temp & 0xff);
	}

	return;
}

/* erase the waveform pre-drawn */
void erase_wave(unsigned char* buf, int count)
{
	int i = 0;

	for ( i=0;i<count;++i ) {
		draw_bigdot(10+i*5, buf[i], GRAY);
	}
	return;
}

/* draw waveform */
void draw_wave(unsigned char* buf, int count)
{
	int i = 0;

	for ( i=0;i<count;++i ) {
		draw_bigdot(10+i*5, buf[i], YELLOW);
	}
	return;
}