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.
20 volatile __xdata struct ao_adc ao_adc_ring[AO_ADC_RING];
21 volatile __data uint8_t ao_adc_head;
26 ADCCON3 = ADCCON3_EREF_VDD | ADCCON3_EDIV_512 | 0;
32 ao_sleep(&ao_adc_ring);
36 ao_adc_get(__xdata struct ao_adc *packet)
38 uint8_t i = ao_adc_ring_prev(ao_adc_head);
39 memcpy(packet, &ao_adc_ring[i], sizeof (struct ao_adc));
43 ao_adc_isr(void) interrupt 1
48 sequence = (ADCCON2 & ADCCON2_SCH_MASK) >> ADCCON2_SCH_SHIFT;
49 if (sequence == ADCCON3_ECH_TEMP)
51 a = (uint8_t __xdata *) (&ao_adc_ring[ao_adc_head].accel + sequence);
55 /* start next channel conversion */
56 /* v0.2 replaces external temp sensor with internal one */
58 ADCCON3 = ADCCON3_EREF_1_25 | ADCCON3_EDIV_512 | ADCCON3_ECH_TEMP;
60 ADCCON3 = ADCCON3_EREF_VDD | ADCCON3_EDIV_512 | (sequence + 1);
62 /* record this conversion series */
63 ao_adc_ring[ao_adc_head].tick = ao_time();
64 ao_adc_head = ao_adc_ring_next(ao_adc_head);
65 ao_wakeup(ao_adc_ring);
70 ao_adc_dump(void) __reentrant
72 static __xdata struct ao_adc packet;
74 printf("tick: %5u accel: %5d pres: %5d temp: %5d batt: %5d drogue: %5d main: %5d\n",
75 packet.tick, packet.accel, packet.pres, packet.temp,
76 packet.v_batt, packet.sense_d, packet.sense_m);
79 __code struct ao_cmds ao_adc_cmds[] = {
80 { 'a', ao_adc_dump, "a Display current ADC values" },
81 { 0, ao_adc_dump, NULL },
87 ADCCFG = ((1 << 0) | /* acceleration */
88 (1 << 1) | /* pressure */
89 /* (1 << 2) | v0.1 temperature */
90 (1 << 3) | /* battery voltage */
91 (1 << 4) | /* drogue sense */
92 (1 << 5)); /* main sense */
94 /* enable interrupts */
97 ao_cmd_register(&ao_adc_cmds[0]);