3 * adcopen - initialize AD module
5 * written by Vangelis Rokas, 2004 <vrokas AT otenet.gr>
11 * This program is free software; you can redistribute it and/or
12 * modify it under the terms of the GNU Library General Public License
13 * as published by the Free Software Foundation; either version 2
14 * of the License, or (at your option) any later version.
16 * This library is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
30 #include <pic18fregs.h>
36 * channel: one of ADC_CHN_*
37 * fosc: one of ADC_FOSC_*
38 * pcfg: one of ADC_CFG_*
39 * config: ADC_FRM_* | ADC_INT_*
42 void adc_open(unsigned char channel, unsigned char fosc, unsigned char pcfg, unsigned char config)
48 ADCON0 |= (channel & 0x07) << 3;
51 ADCON0 |= (fosc & 0x03) << 6;
52 ADCON1 |= (fosc & 0x04) << 4;
54 /* setup reference and pins */
55 ADCON1 |= pcfg & 0x0f;
57 ADCON1 |= (config & ADC_FRM_RJUST);
59 if(config & ADC_INT_ON) {
65 /* enable the A/D module */