diff options
Diffstat (limited to 'src-avr/ao_adc.c')
| -rw-r--r-- | src-avr/ao_adc.c | 196 |
1 files changed, 196 insertions, 0 deletions
diff --git a/src-avr/ao_adc.c b/src-avr/ao_adc.c new file mode 100644 index 00000000..48568383 --- /dev/null +++ b/src-avr/ao_adc.c @@ -0,0 +1,196 @@ +/* + * Copyright © 2009 Keith Packard <keithp@keithp.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; version 2 of the License. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, write to the Free Software Foundation, Inc., + * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. + */ + +#include "ao.h" +#include "ao_pins.h" + +volatile __xdata struct ao_adc ao_adc_ring[AO_ADC_RING]; +#if HAS_ACCEL_REF +volatile __xdata uint16_t ao_accel_ref[AO_ADC_RING]; +#endif +volatile __data uint8_t ao_adc_head; + +void +ao_adc_poll(void) +{ +#if HAS_ACCEL_REF + ADCCON3 = ADCCON3_EREF_VDD | ADCCON3_EDIV_512 | 2; +#else +# ifdef TELENANO_V_0_1 + ADCCON3 = ADCCON3_EREF_VDD | ADCCON3_EDIV_512 | 1; +# else + ADCCON3 = ADCCON3_EREF_VDD | ADCCON3_EDIV_512 | 0; +# endif +#endif +} + +void +ao_adc_get(__xdata struct ao_adc *packet) +{ + uint8_t i = ao_adc_ring_prev(ao_sample_adc); + memcpy(packet, &ao_adc_ring[i], sizeof (struct ao_adc)); +} + +void +ao_adc_isr(void) __interrupt 1 +{ + uint8_t sequence; + uint8_t __xdata *a; + + sequence = (ADCCON2 & ADCCON2_SCH_MASK) >> ADCCON2_SCH_SHIFT; +#if IGNITE_ON_P2 + /* TeleMetrum readings */ +#if HAS_ACCEL_REF + if (sequence == 2) { + a = (uint8_t __xdata *) (&ao_accel_ref[ao_adc_head]); + sequence = 0; + } else +#endif + { + if (sequence == ADCCON3_ECH_TEMP) + sequence = 2; + a = (uint8_t __xdata *) (&ao_adc_ring[ao_adc_head].accel + sequence); + sequence++; + } +#define GOT_ADC + a[0] = ADCL; + a[1] = ADCH; + if (sequence < 6) { +#if HAS_EXTERNAL_TEMP == 0 + /* start next channel conversion */ + /* v0.2 replaces external temp sensor with internal one */ + if (sequence == 2) + ADCCON3 = ADCCON3_EREF_1_25 | ADCCON3_EDIV_512 | ADCCON3_ECH_TEMP; + else +#endif + ADCCON3 = ADCCON3_EREF_VDD | ADCCON3_EDIV_512 | sequence; + } +#endif + +#if IGNITE_ON_P0 + /* TeleMini readings */ + a = (uint8_t __xdata *) (&ao_adc_ring[ao_adc_head].pres); +#ifdef TELEMINI_V_0_1 + switch (sequence) { + case 0: + /* pressure */ + a += 0; + sequence = ADCCON3_EREF_VDD | ADCCON3_EDIV_512 | 1; + break; + case 1: + /* drogue sense */ + a += 6; + sequence = ADCCON3_EREF_VDD | ADCCON3_EDIV_512 | 2; + break; + case 2: + /* main sense */ + a += 8; + sequence = ADCCON3_EREF_VDD | ADCCON3_EDIV_512 | 3; + break; + case 3: + /* battery */ + a += 4; + sequence = ADCCON3_EREF_1_25 | ADCCON3_EDIV_512 | ADCCON3_ECH_TEMP; + break; + case ADCCON3_ECH_TEMP: + a += 2; + sequence = 0; + break; + } +#define GOT_ADC +#endif +#ifdef TELENANO_V_0_1 + switch (sequence) { + case 1: + /* pressure */ + a += 0; + sequence = ADCCON3_EREF_VDD | ADCCON3_EDIV_512 | 3; + break; + case 3: + /* battery */ + a += 4; + sequence = ADCCON3_EREF_1_25 | ADCCON3_EDIV_512 | ADCCON3_ECH_TEMP; + break; + case ADCCON3_ECH_TEMP: + a += 2; + sequence = 0; + break; + } +#define GOT_ADC +#endif + a[0] = ADCL; + a[1] = ADCH; + if (sequence) { + /* Start next conversion */ + ADCCON3 = sequence; + } +#endif +#ifndef GOT_ADC +#error No known ADC configuration set +#endif + + else { + /* record this conversion series */ + ao_adc_ring[ao_adc_head].tick = ao_time(); + ao_adc_head = ao_adc_ring_next(ao_adc_head); + ao_wakeup(DATA_TO_XDATA(&ao_adc_head)); + } +} + +static void +ao_adc_dump(void) __reentrant +{ + static __xdata struct ao_adc packet; + ao_adc_get(&packet); + printf("tick: %5u accel: %5d pres: %5d temp: %5d batt: %5d drogue: %5d main: %5d\n", + packet.tick, packet.accel, packet.pres, packet.temp, + packet.v_batt, packet.sense_d, packet.sense_m); +} + +__code struct ao_cmds ao_adc_cmds[] = { + { ao_adc_dump, "a\0Display current ADC values" }, + { 0, NULL }, +}; + +void +ao_adc_init(void) +{ +#if IGNITE_ON_P2 + /* TeleMetrum configuration */ + ADCCFG = ((1 << 0) | /* acceleration */ + (1 << 1) | /* pressure */ +#if HAS_EXTERNAL_TEMP + (1 << 2) | /* v0.1 temperature */ +#endif + (1 << 3) | /* battery voltage */ + (1 << 4) | /* drogue sense */ + (1 << 5)); /* main sense */ +#endif + +#if IGNITE_ON_P0 + /* TeleMini configuration */ + ADCCFG = ((1 << 0) | /* pressure */ + (1 << 1) | /* drogue sense */ + (1 << 2) | /* main sense */ + (1 << 3)); /* battery voltage */ +#endif + + /* enable interrupts */ + ADCIF = 0; + IEN0 |= IEN0_ADCIE; + ao_cmd_register(&ao_adc_cmds[0]); +} |