/* * Copyright © 2014 Keith Packard * * 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