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/*
* Copyright © 2014 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"
#define MUL(p,m) ((int32_t) AO_ADC_REFERENCE_DV * ((p) + (m)))
#define ADD(p,m) (MUL(p,m)/2)
#define DIV(p,m) ((int32_t) AO_ADC_MAX * (m))
#define scale(v,p,m) (((int32_t) (v) * MUL(p,m) + ADD(p,m)) / DIV(p,m))
#if HAS_APRS || HAS_BATTERY_REPORT
int16_t
ao_battery_decivolt(int16_t adc)
{
return scale(adc, AO_BATTERY_DIV_PLUS, AO_BATTERY_DIV_MINUS);
}
#endif
#if HAS_APRS && defined(AO_IGNITE_DIV_PLUS)
int16_t
ao_ignite_decivolt(int16_t adc)
{
return scale(adc, AO_IGNITE_DIV_PLUS, AO_IGNITE_DIV_MINUS);
}
#endif
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