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/*
* 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];
volatile __data uint8_t ao_adc_head;
void
ao_adc_poll(void)
{
ADCCON3 = ADCCON3_EREF_VDD | ADCCON3_EDIV_512 | 0;
}
void
ao_adc_sleep(void)
{
ao_sleep(&ao_adc_ring);
}
void
ao_adc_get(__xdata struct ao_adc *packet)
{
uint8_t i = ao_adc_ring_prev(ao_adc_head);
memcpy(packet, &ao_adc_ring[i], sizeof (struct ao_adc));
}
#ifdef HAS_ADC_5V
static void
ao_fix_accel(void)
{
uint32_t total;
uint8_t adc_l, adc_h;
uint8_t ref_l, ref_h;
uint8_t __xdata *p = (uint8_t __xdata *) &ao_adc_ring[ao_adc_head].accel;
ref_l = ADCL;
adc_l = p[0];
total = (uint32_t) (uint16_t) (adc_l * ref_l);
adc_h = p[1];
total += (uint32_t) (uint16_t) (adc_h * ref_l) << 8;
ref_h = ADCH;
total += (uint32_t) (uint16_t) (adc_l * ref_h) << 8;
total += (uint32_t) (uint16_t) (adc_h * ref_h) << 16;
*(uint16_t __xdata *) p = total >> 16;
}
#endif
void
ao_adc_isr(void) __interrupt 1
{
uint8_t sequence;
uint8_t __xdata *a;
sequence = (ADCCON2 & ADCCON2_SCH_MASK) >> ADCCON2_SCH_SHIFT;
#if HAS_ADC_5V
if (sequence == 2) {
ao_fix_accel();
/* and launch the temp sensor next */
ADCCON3 = ADCCON3_EREF_1_25 | ADCCON3_EDIV_512 | ADCCON3_ECH_TEMP;
return;
}
#endif
#if HAS_EXTERNAL_TEMP
if (sequence == ADCCON3_ECH_TEMP)
sequence = 2;
#endif
a = (uint8_t __xdata *) (&ao_adc_ring[ao_adc_head].accel + sequence);
a[0] = ADCL;
a[1] = ADCH;
if (sequence < 5) {
#if !HAS_EXTERNAL_TEMP && !HAS_ADC_5V
/* start next channel conversion */
/* v0.2 replaces external temp sensor with internal one */
if (sequence == 1)
ADCCON3 = ADCCON3_EREF_1_25 | ADCCON3_EDIV_512 | ADCCON3_ECH_TEMP;
else
#endif
ADCCON3 = ADCCON3_EREF_VDD | ADCCON3_EDIV_512 | (sequence + 1);
} 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(ao_adc_ring);
}
}
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[] = {
{ 'a', ao_adc_dump, "a Display current ADC values" },
{ 0, ao_adc_dump, NULL },
};
void
ao_adc_init(void)
{
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 */
/* enable interrupts */
ADCIF = 0;
IEN0 |= IEN0_ADCIE;
ao_cmd_register(&ao_adc_cmds[0]);
}
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