64 lines
2.0 KiB
C
64 lines
2.0 KiB
C
/*
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* Copyright © 2012 Keith Packard <keithp@keithp.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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*/
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#include <ao-ms5607.h>
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void
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ao_ms5607_convert(struct ao_ms5607_sample *sample, struct ao_ms5607_value *value,
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struct ao_ms5607_prom *prom, bool is_ms5611)
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{
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int32_t dT;
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int32_t TEMP;
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int64_t OFF;
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int64_t SENS;
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dT = sample->temp - ((int32_t) prom->tref << 8);
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TEMP = 2000 + (((int64_t) dT * prom->tempsens) >> 23);
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if (is_ms5611) {
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OFF = ((int64_t) prom->off << 16) + (((int64_t) prom->tco * dT) >> 7);
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SENS = ((int64_t) prom->sens << 15) + (((int64_t) prom->tcs * dT) >> 8);
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} else {
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OFF = ((int64_t) prom->off << 17) + (((int64_t) prom->tco * dT) >> 6);
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SENS = ((int64_t) prom->sens << 16) + (((int64_t) prom->tcs * dT) >> 7);
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}
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if (TEMP < 2000) {
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int32_t T2 = ((int64_t) dT * (int64_t) dT) >> 31;
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int32_t TEMPM = TEMP - 2000;
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int64_t OFF2 = (61 * (int64_t) TEMPM * (int64_t) TEMPM) >> 4;
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int64_t SENS2 = 2 * (int64_t) TEMPM * (int64_t) TEMPM;
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if (TEMP < -1500) {
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int32_t TEMPP = TEMP + 1500;
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/* You'd think this would need a 64-bit int, but
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* that would imply a temperature below -327.67°C...
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*/
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int32_t TEMPP2 = TEMPP * TEMPP;
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OFF2 = OFF2 + (int64_t) 15 * TEMPP2;
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SENS2 = SENS2 + (int64_t) 8 * TEMPP2;
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}
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TEMP -= T2;
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OFF -= OFF2;
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SENS -= SENS2;
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}
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value->pres = ((((int64_t) sample->pres * SENS) >> 21) - OFF) >> 15;
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value->temp = TEMP;
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}
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