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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"
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_head;
if (i == 0)
i = AO_ADC_RING;
i--;
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;
a = (uint8_t __xdata *) (&ao_adc_ring[ao_adc_head].accel + sequence);
a[0] = ADCL;
a[1] = ADCH;
if (sequence < 5) {
/* start next channel conversion */
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++;
if (ao_adc_head == AO_ADC_RING)
ao_adc_head = 0;
ao_wakeup(ao_adc_ring);
}
}
void
ao_adc_init(void)
{
ADCCFG = ((1 << 0) | /* acceleration */
(1 << 1) | /* pressure */
(1 << 2) | /* temperature */
(1 << 3) | /* battery voltage */
(1 << 4) | /* drogue sense */
(1 << 5)); /* main sense */
/* enable interrupts */
ADCIF = 0;
IEN0 |= IEN0_ADCIE;
}
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