![](/media/cache/img/default_profile.jpg.50x50_q85.jpg)
Sat program
Dependencies: Adafruit_GFX Adafruit_RTCLib BMP180 L3GD20 LSM303DLHC SHTx mbed
Diff: MS5803/MS5803.cpp
- Revision:
- 0:07c50519b515
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/MS5803/MS5803.cpp Mon Nov 09 18:22:43 2015 +0000 @@ -0,0 +1,106 @@ +/* + Permission is hereby granted, free of charge, to any person obtaining a copy + of this software and associated documentation files (the "Software"), to deal + in the Software without restriction, including without limitation the rights + to use, copy, modify, merge, publish, distribute, sublicense, and/or sell + copies of the Software, and to permit persons to whom the Software is + furnished to do so, subject to the following conditions: + + The above copyright notice and this permission notice shall be included in + all copies or substantial portions of the Software. + + THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE + AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, + OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN + THE SOFTWARE. + + * Barometer Sensor (Altimeter) MS5803-01BA of MEAS Switzerland (www.meas-spec.com). + * The driver uses I2C mode (sensor PS pin low). + * Other types of MEAS are compatible but not tested. + * Written by Raig Kaufer distribute freely! + */ + +#include <stdlib.h> +#include "MS5803.h" + + +/* + * Sensor operating function according data sheet + */ + +/* Send soft reset to the sensor */ +void MS5803::MS5803Reset(void) { + /* transmit out 1 byte reset command */ + ms5803_tx_data[0] = ms5803_reset; + if ( i2c.write( device_address, ms5803_tx_data, 1 ) ); + wait_ms(20); +} + +/* read the sensor calibration data from rom */ +void MS5803::MS5803ReadProm(void) { + uint8_t i,j; + for (i=0; i<8; i++) { + j = i; + ms5803_tx_data[0] = ms5803_PROMread + (j<<1); + if ( i2c.write( device_address, ms5803_tx_data, 1 ) ); + if ( i2c.read( device_address, ms5803_rx_data, 2 ) ); + C[i] = ms5803_rx_data[1] + (ms5803_rx_data[0]<<8); + } +} + +/* Start the sensor pressure conversion */ +void MS5803::MS5803ConvertD1(void) { + ms5803_tx_data[0] = ms5803_convD1; + if ( i2c.write( device_address, ms5803_tx_data, 1 ) ); +} + +/* Start the sensor temperature conversion */ +void MS5803:: MS5803ConvertD2(void) { + ms5803_tx_data[0] = ms5803_convD2; + if ( i2c.write( device_address, ms5803_tx_data, 1 ) ); +} + +/* Read the privious started conversion results */ +int32_t MS5803::MS5803ReadADC(void) { + int32_t adc; + wait_ms(150); + ms5803_tx_data[0] = ms5803_ADCread; + if ( i2c.write( device_address, ms5803_tx_data, 1 ) ); + if ( i2c.read( device_address, ms5803_rx_data, 3 ) ); + adc = ms5803_rx_data[2] + (ms5803_rx_data[1]<<8) + (ms5803_rx_data[0]<<16); + return (adc); +} + +/* return the results */ +float MS5803::MS5803_Pressure (void) { + return P_MS5803; +} +float MS5803::MS5803_Temperature (void) { + return T_MS5803; +} + +/* Sensor reading and calculation prcedure */ +void MS5803::Barometer_MS5803(void) { + int32_t dT, temp; + int64_t OFF, SENS, press; + + MS5803Reset(); // reset the sensor + MS5803ReadProm(); // read the calibration values + MS5803ConvertD1(); // start pressure convertion + D1 = MS5803ReadADC(); // read the pressure value + MS5803ConvertD2(); // start temperature convertion + D2 = MS5803ReadADC(); // read the temperature value + + /* calculation according MS5803-01BA data sheet DA5803-01BA_006 */ + dT = D2 - (C[5]* 256); + OFF = (int64_t)C[2] * (1<<16) + ((int64_t)dT * (int64_t)C[4]) / (1<<7); + SENS = (int64_t)C[1] * (1<<15) + ((int64_t)dT * (int64_t)C[3]) / (1<<8); + + temp = 2000 + (dT * C[6]) / (1<<23); + T_MS5803 = (float) temp / 100.0f; // result of temperature in deg C in this var + press = (((int64_t)D1 * SENS) / (1<<21) - OFF) / (1<<15); + P_MS5803 = (float) press / 100.0f; // result of pressure in mBar in this var +}