diff options
Diffstat (limited to 'src/drivers/ao_ms5607_convert_8051.c')
| -rw-r--r-- | src/drivers/ao_ms5607_convert_8051.c | 136 |
1 files changed, 136 insertions, 0 deletions
diff --git a/src/drivers/ao_ms5607_convert_8051.c b/src/drivers/ao_ms5607_convert_8051.c new file mode 100644 index 00000000..f3a48c46 --- /dev/null +++ b/src/drivers/ao_ms5607_convert_8051.c @@ -0,0 +1,136 @@ +/* + * 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; +} |