?? dac.c
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/*
* $Id: dac.c,v 1.3 2003/08/29 09:20:32 ynding Exp $
*
* dac.c : dac driver
*
* Copyright (C) 2003 ynding ( haoanian@263.net )
*
* 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 "dac.h"
/* waves */
static unsigned int pulse[12] = {
0x77777777,0x77777777,0x77777777,0x77777777,0x77777777,0x77777777,
0x00000000,0x00000000,0x00000000,0x00000000,0x00000000,0x00000000
};
static unsigned int triangle[12] = {
0x00000000,0x15151515,0x2a2a2a2a,0x3f3f3f3f,0x54545454,0x69696969,
0x7e7e7e7e,0x69696969,0x54545454,0x3f3f3f3f,0x2a2a2a2a,0x15151515
};
static unsigned int sine[12] = {
0x3f3f3f3f,0x5f5f5f5f,0x76767676,0x7f7f7f7f,0x76767676,0x5f5f5f5f,
0x3f3f3f3f,0x20202020,0x09090909,0x00000000,0x09090909,0x20202020
};
static unsigned int* wave[3] = { pulse, triangle, sine };
/* time delay */
void wait(int time)
{
int i = 0;
int j = 0;
for ( i=0;i<time;++i ){
for ( j=0;j<1000;++j )
;
}
return;
}
/* DA conversion */
void dac( unsigned int data )
{
MEMCFG2 |= 0x00000012;
DAC_ADDR = data;
return;
}
/* generate wave */
void generate_wave(int wavetype, int interval)
{
int i = 0;
for ( i=0;i<12;++i ) {
DAC_ADDR = wave[wavetype][i];
wait(interval);
}
return;
}
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