2 * Copyright © 2009 Keith Packard <keithp@keithp.com>
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
9 * This program is distributed in the hope that it will be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * General Public License for more details.
14 * You should have received a copy of the GNU General Public License along
15 * with this program; if not, write to the Free Software Foundation, Inc.,
16 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
21 __xdata struct ao_adc ao_adc_ring[ADC_RING];
22 __data uint8_t ao_adc_head;
24 void ao_adc_isr(void) interrupt 1
29 sequence = (ADCCON2 & ADCCON2_SCH_MASK) >> ADCCON2_SCH_SHIFT;
30 a = (uint8_t __xdata *) (&ao_adc_ring[ao_adc_head].accel + sequence);
34 /* start next channel conversion */
35 ADCCON3 = ADCCON3_EREF_VDD | ADCCON3_EDIV_512 | (sequence + 1);
37 /* record this conversion series */
38 ao_adc_ring[ao_adc_head].tick = ao_time;
40 if (ao_adc_head == ADC_RING)
42 ao_wakeup(ao_adc_ring);
46 void ao_adc_init(void)
48 ADCCFG = ((1 << 0) | /* acceleration */
49 (1 << 1) | /* pressure */
50 (1 << 2) | /* temperature */
51 (1 << 3) | /* battery voltage */
52 (1 << 4) | /* drogue sense */
53 (1 << 5)); /* main sense */
55 /* enable interrupts */
60 void ao_adc_poll(void)
62 ADCCON3 = ADCCON3_EREF_VDD | ADCCON3_EDIV_512 | 0;
65 void ao_adc_get(__xdata struct ao_adc *packet)
67 uint8_t i = ao_adc_head;
71 memcpy(packet, &ao_adc_ring[i], sizeof (struct ao_adc));