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];
23 volatile __xdata uint16_t ao_accel_ref[AO_ADC_RING];
25 volatile __data uint8_t ao_adc_head;
31 ADCCON3 = ADCCON3_EREF_VDD | ADCCON3_EDIV_512 | 2;
33 # ifdef TELENANO_V_0_1
34 ADCCON3 = ADCCON3_EREF_VDD | ADCCON3_EDIV_512 | 1;
36 ADCCON3 = ADCCON3_EREF_VDD | ADCCON3_EDIV_512 | 0;
42 ao_adc_get(__xdata struct ao_adc *packet)
44 uint8_t i = ao_adc_ring_prev(ao_sample_adc);
45 memcpy(packet, &ao_adc_ring[i], sizeof (struct ao_adc));
49 ao_adc_isr(void) __interrupt 1
54 sequence = (ADCCON2 & ADCCON2_SCH_MASK) >> ADCCON2_SCH_SHIFT;
56 /* TeleMetrum readings */
59 a = (uint8_t __xdata *) (&ao_accel_ref[ao_adc_head]);
64 if (sequence == ADCCON3_ECH_TEMP)
66 a = (uint8_t __xdata *) (&ao_adc_ring[ao_adc_head].accel + sequence);
73 #if HAS_EXTERNAL_TEMP == 0
74 /* start next channel conversion */
75 /* v0.2 replaces external temp sensor with internal one */
77 ADCCON3 = ADCCON3_EREF_1_25 | ADCCON3_EDIV_512 | ADCCON3_ECH_TEMP;
80 ADCCON3 = ADCCON3_EREF_VDD | ADCCON3_EDIV_512 | sequence;
85 /* TeleMini readings */
86 a = (uint8_t __xdata *) (&ao_adc_ring[ao_adc_head].pres);
92 sequence = ADCCON3_EREF_VDD | ADCCON3_EDIV_512 | 1;
97 sequence = ADCCON3_EREF_VDD | ADCCON3_EDIV_512 | 2;
102 sequence = ADCCON3_EREF_VDD | ADCCON3_EDIV_512 | 3;
107 sequence = ADCCON3_EREF_1_25 | ADCCON3_EDIV_512 | ADCCON3_ECH_TEMP;
109 case ADCCON3_ECH_TEMP:
116 #ifdef TELENANO_V_0_1
121 sequence = ADCCON3_EREF_VDD | ADCCON3_EDIV_512 | 3;
126 sequence = ADCCON3_EREF_1_25 | ADCCON3_EDIV_512 | ADCCON3_ECH_TEMP;
128 case ADCCON3_ECH_TEMP:
138 /* Start next conversion */
143 #error No known ADC configuration set
147 /* record this conversion series */
148 ao_adc_ring[ao_adc_head].tick = ao_time();
149 ao_adc_head = ao_adc_ring_next(ao_adc_head);
150 ao_wakeup(DATA_TO_XDATA(&ao_adc_head));
155 ao_adc_dump(void) __reentrant
157 static __xdata struct ao_adc packet;
159 printf("tick: %5u accel: %5d pres: %5d temp: %5d batt: %5d drogue: %5d main: %5d\n",
160 packet.tick, packet.accel, packet.pres, packet.temp,
161 packet.v_batt, packet.sense_d, packet.sense_m);
164 __code struct ao_cmds ao_adc_cmds[] = {
165 { ao_adc_dump, "a\0Display current ADC values" },
173 /* TeleMetrum configuration */
174 ADCCFG = ((1 << 0) | /* acceleration */
175 (1 << 1) | /* pressure */
176 #if HAS_EXTERNAL_TEMP
177 (1 << 2) | /* v0.1 temperature */
179 (1 << 3) | /* battery voltage */
180 (1 << 4) | /* drogue sense */
181 (1 << 5)); /* main sense */
185 /* TeleMini configuration */
186 ADCCFG = ((1 << 0) | /* pressure */
187 (1 << 1) | /* drogue sense */
188 (1 << 2) | /* main sense */
189 (1 << 3)); /* battery voltage */
192 /* enable interrupts */
195 ao_cmd_register(&ao_adc_cmds[0]);