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; version 2 of the License.
8 * This program is distributed in the hope that it will be useful, but
9 * WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * General Public License for more details.
13 * You should have received a copy of the GNU General Public License along
14 * with this program; if not, write to the Free Software Foundation, Inc.,
15 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
21 volatile __xdata struct ao_adc ao_adc_ring[AO_ADC_RING];
22 volatile __data uint8_t ao_adc_head;
27 ADCCON3 = ADCCON3_EREF_VDD | ADCCON3_EDIV_512 | 0;
33 ao_sleep(&ao_adc_ring);
37 ao_adc_get(__xdata struct ao_adc *packet)
39 uint8_t i = ao_adc_ring_prev(ao_adc_head);
40 memcpy(packet, &ao_adc_ring[i], sizeof (struct ao_adc));
44 ao_adc_isr(void) interrupt 1
49 sequence = (ADCCON2 & ADCCON2_SCH_MASK) >> ADCCON2_SCH_SHIFT;
50 if (sequence == ADCCON3_ECH_TEMP)
52 a = (uint8_t __xdata *) (&ao_adc_ring[ao_adc_head].accel + sequence);
56 #if HAS_EXTERNAL_TEMP == 0
57 /* start next channel conversion */
58 /* v0.2 replaces external temp sensor with internal one */
60 ADCCON3 = ADCCON3_EREF_1_25 | ADCCON3_EDIV_512 | ADCCON3_ECH_TEMP;
63 ADCCON3 = ADCCON3_EREF_VDD | ADCCON3_EDIV_512 | (sequence + 1);
65 /* record this conversion series */
66 ao_adc_ring[ao_adc_head].tick = ao_time();
67 ao_adc_head = ao_adc_ring_next(ao_adc_head);
68 ao_wakeup(ao_adc_ring);
73 ao_adc_dump(void) __reentrant
75 static __xdata struct ao_adc packet;
77 printf("tick: %5u accel: %5d pres: %5d temp: %5d batt: %5d drogue: %5d main: %5d\n",
78 packet.tick, packet.accel, packet.pres, packet.temp,
79 packet.v_batt, packet.sense_d, packet.sense_m);
82 __code struct ao_cmds ao_adc_cmds[] = {
83 { 'a', ao_adc_dump, "a Display current ADC values" },
84 { 0, ao_adc_dump, NULL },
90 ADCCFG = ((1 << 0) | /* acceleration */
91 (1 << 1) | /* pressure */
93 (1 << 2) | /* v0.1 temperature */
95 (1 << 3) | /* battery voltage */
96 (1 << 4) | /* drogue sense */
97 (1 << 5)); /* main sense */
99 /* enable interrupts */
102 ao_cmd_register(&ao_adc_cmds[0]);