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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.
*/
#include <ao_ms5607.h>
#include <ao_int64.h>
#if HAS_MS5611
#define SHIFT_OFF 16
#define SHIFT_TCO 7
#define SHIFT_SENS 15
#define SHFIT_TCS 8
#else
#define SHIFT_OFF 17
#define SHIFT_TCO 6
#define SHIFT_SENS 16
#define SHIFT_TCS 7
#endif
void
ao_ms5607_convert(__xdata struct ao_ms5607_sample *sample,
__xdata struct ao_ms5607_value *value)
{
__LOCAL int32_t dT;
__LOCAL int32_t TEMP;
__LOCAL ao_int64_t OFF;
__LOCAL ao_int64_t SENS;
__LOCAL ao_int64_t a;
dT = sample->temp - ((int32_t) ms5607_prom.tref << 8);
/* TEMP = 2000 + (((int64_t) dT * ms5607_prom.tempsens) >> 23); */
ao_mul64_32_32(&a, dT, ms5607_prom.tempsens);
ao_rshift64(&a, &a, 23);
TEMP = 2000 + a.low;
/* */
/* OFF = ((int64_t) ms5607_prom.off << SHIFT_OFF) + (((int64_t) ms5607_prom.tco * dT) >> SHIFT_TCO);*/
#if SHIFT_OFF > 16
OFF.high = ms5607_prom.off >> (32 - SHIFT_OFF);
#else
OFF.high = 0;
#endif
OFF.low = (uint32_t) ms5607_prom.off << SHIFT_OFF;
ao_mul64_32_32(&a, ms5607_prom.tco, dT);
ao_rshift64(&a, &a, SHIFT_TCO);
ao_plus64(&OFF, &OFF, &a);
/**/
/* SENS = ((int64_t) ms5607_prom.sens << SHIFT_SENS) + (((int64_t) ms5607_prom.tcs * dT) >> SHIFT_TCS); */
SENS.high = 0;
SENS.low = (uint32_t) ms5607_prom.sens << SHIFT_SENS;
ao_mul64_32_32(&a, ms5607_prom.tcs, dT);
ao_rshift64(&a, &a, SHIFT_TCS);
ao_plus64(&SENS, &SENS, &a);
/**/
if (TEMP < 2000) {
__LOCAL int32_t T2;
__LOCAL int32_t TEMPM;
__LOCAL ao_int64_t OFF2;
__LOCAL ao_int64_t SENS2;
/* T2 = ((int64_t) dT * (int64_t) dT) >> 31; */
ao_mul64_32_32(&a, dT, dT);
T2 = (a.low >> 31) | (a.high << 1);
/**/
TEMPM = TEMP - 2000;
/* OFF2 = (61 * (int64_t) TEMPM * (int64_t) TEMPM) >> 4; */
ao_mul64_32_32(&OFF2, TEMPM, TEMPM);
ao_mul64_64_16(&OFF2, &OFF2, 61);
ao_rshift64(&OFF2, &OFF2, 4);
/**/
/* SENS2 = 2 * (int64_t) TEMPM * (int64_t) TEMPM; */
ao_mul64_32_32(&SENS2, TEMPM, TEMPM);
ao_lshift64(&SENS2, &SENS2, 1);
/**/
if (TEMP < -1500) {
int32_t TEMPP;
int32_t TEMPP2;
TEMPP = TEMP + 1500;
TEMPP2 = TEMPP * TEMPP;
/* OFF2 = OFF2 + 15 * TEMPP2; */
ao_mul64_32_32(&a, 15, TEMPP2);
ao_plus64(&OFF2, &OFF2, &a);
/**/
/* SENS2 = SENS2 + 8 * TEMPP2; */
a.high = 0;
a.low = TEMPP2;
ao_lshift64(&a, &a, 3);
ao_plus64(&SENS2, &SENS2, &a);
/**/
}
TEMP -= T2;
/* OFF -= OFF2; */
ao_minus64(&OFF, &OFF, &OFF2);
/**/
/* SENS -= SENS2; */
ao_minus64(&SENS, &SENS, &SENS2);
/**/
}
/* value->pres = ((((int64_t) sample->pres * SENS) >> 21) - OFF) >> 15; */
a.high = 0;
a.low = sample->pres;
ao_mul64(&a, &a, &SENS);
ao_rshift64(&a, &a, 21);
ao_minus64(&a, &a, &OFF);
ao_rshift64(&a, &a, 15);
value->pres = a.low;
/**/
value->temp = TEMP;
}
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