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/*
* Copyright © 2012 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.
*/
#ifndef _AO_ADC_H_
#define _AO_ADC_H_
/*
* One set of samples read from the A/D converter or telemetry
*/
/*
* ao_adc.c
*/
#define ao_adc_ring_next(n) (((n) + 1) & (AO_ADC_RING - 1))
#define ao_adc_ring_prev(n) (((n) - 1) & (AO_ADC_RING - 1))
/*
* A/D data is stored in a ring, with the next sample to be written
* at ao_adc_head
*/
extern volatile __xdata struct ao_adc ao_adc_ring[AO_ADC_RING];
extern volatile __data uint8_t ao_adc_head;
#if HAS_ACCEL_REF
extern volatile __xdata uint16_t ao_accel_ref[AO_ADC_RING];
#endif
/* Trigger a conversion sequence (called from the timer interrupt) */
void
ao_adc_poll(void);
/* Suspend the current task until another A/D sample is converted */
void
ao_adc_sleep(void);
/* Get a copy of the last complete A/D sample set */
void
ao_adc_get(__xdata struct ao_adc *packet);
/* Initialize the A/D converter */
void
ao_adc_init(void);
#endif /* _AO_ADC_H_ */
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