first commit
This commit is contained in:
Jérôme Delacotte
142
BMP085_TEST/BMP085.h
Executable file
142
BMP085_TEST/BMP085.h
Executable file
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/****************************************************************************
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* BMP085.h - BMP085/I2C (Digital Pressure Sensor) library for Arduino *
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* Copyright 2010-2012 Filipe Vieira & various contributors *
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* *
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* This file is part of BMP085 Arduino library. *
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* *
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* This library is free software: you can redistribute it and/or modify *
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* it under the terms of the GNU Lesser General Public License as published *
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* by the Free Software Foundation, either version 3 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, *
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* but WITHOUT ANY WARRANTY; without even the implied warranty of *
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
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* GNU Lesser General Public License for more details. *
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* *
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* You should have received a copy of the GNU Lesser General Public License *
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* along with this program. If not, see <http://www.gnu.org/licenses/>. *
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****************************************************************************/
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/****************************************************************************
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* Tested on Arduino Mega with BMP085 Breakout *
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* SDA -> pin 20 (no pull up resistors) *
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* SCL -> pin 21 (no pull up resistors) *
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* XCLR -> not connected *
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* EOC -> not connected *
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* GND -> pin GND *
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* VCC -> pin 3.3V *
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* NOTE: SCL and SDA needs pull-up resistors for each I2C bus. *
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* 2.2kOhm..10kOhm, typ. 4.7kOhm *
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*****************************************************************************/
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#ifndef BMP085_h
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#define BMP085_h
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#if defined(ARDUINO) && ARDUINO >= 100
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#include "Arduino.h"
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#else
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#include "WProgram.h"
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#endif
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#define BMP085_ADDR 0x77 //0x77 default I2C address
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#define BUFFER_SIZE 3
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#define AUTO_UPDATE_TEMPERATURE true //default is true
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// when true, temperature is measured everytime pressure is measured (Auto).
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// when false, user chooses when to measure temperature (just call calcTrueTemperature()).
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// used for dynamic measurement to increase sample rate (see BMP085 modes below).
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/* ---- Registers ---- */
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#define CAL_AC1 0xAA // R Calibration data (16 bits)
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#define CAL_AC2 0xAC // R Calibration data (16 bits)
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#define CAL_AC3 0xAE // R Calibration data (16 bits)
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#define CAL_AC4 0xB0 // R Calibration data (16 bits)
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#define CAL_AC5 0xB2 // R Calibration data (16 bits)
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#define CAL_AC6 0xB4 // R Calibration data (16 bits)
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#define CAL_B1 0xB6 // R Calibration data (16 bits)
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#define CAL_B2 0xB8 // R Calibration data (16 bits)
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#define CAL_MB 0xBA // R Calibration data (16 bits)
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#define CAL_MC 0xBC // R Calibration data (16 bits)
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#define CAL_MD 0xBE // R Calibration data (16 bits)
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#define CONTROL 0xF4 // W Control register
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#define CONTROL_OUTPUT 0xF6 // R Output registers 0xF6=MSB, 0xF7=LSB, 0xF8=XLSB
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// unused registers
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#define SOFTRESET 0xE0
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#define VERSION 0xD1 // ML_VERSION pos=0 len=4 msk=0F AL_VERSION pos=4 len=4 msk=f0
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#define CHIPID 0xD0 // pos=0 mask=FF len=8
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// BMP085_CHIP_ID=0x55
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/************************************/
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/* REGISTERS PARAMETERS */
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/************************************/
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// BMP085 Modes
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#define MODE_ULTRA_LOW_POWER 0 //oversampling=0, internalsamples=1, maxconvtimepressure=4.5ms, avgcurrent=3uA, RMSnoise_hPA=0.06, RMSnoise_m=0.5
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#define MODE_STANDARD 1 //oversampling=1, internalsamples=2, maxconvtimepressure=7.5ms, avgcurrent=5uA, RMSnoise_hPA=0.05, RMSnoise_m=0.4
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#define MODE_HIGHRES 2 //oversampling=2, internalsamples=4, maxconvtimepressure=13.5ms, avgcurrent=7uA, RMSnoise_hPA=0.04, RMSnoise_m=0.3
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#define MODE_ULTRA_HIGHRES 3 //oversampling=3, internalsamples=8, maxconvtimepressure=25.5ms, avgcurrent=12uA, RMSnoise_hPA=0.03, RMSnoise_m=0.25
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// "Sampling rate can be increased to 128 samples per second (standard mode) for
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// dynamic measurement.In this case it is sufficient to measure temperature only
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// once per second and to use this value for all pressure measurements during period."
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// (from BMP085 datasheet Rev1.2 page 10).
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// To use dynamic measurement set AUTO_UPDATE_TEMPERATURE to false and
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// call calcTrueTemperature() from your code.
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// Control register
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#define READ_TEMPERATURE 0x2E
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#define READ_PRESSURE 0x34
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//Other
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#define MSLP 101325 // Mean Sea Level Pressure = 1013.25 hPA (1hPa = 100Pa = 1mbar)
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class BMP085 {
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public:
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BMP085();
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// BMP initialization
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void init(); // sets current elevation above ground level to 0 meters
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void init(byte _BMPMode, int32_t _initVal, bool _centimeters); // sets a reference datum
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// if _centimeters=false _initVal is Pa
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// Who Am I
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byte getDevAddr();
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// BMP mode
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byte getMode();
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void setMode(byte _BMPMode); // BMP085 mode
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// initialization
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void setLocalPressure(int32_t _Pa); // set known barometric pressure as reference Ex. QNH
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void setLocalAbsAlt(int32_t _centimeters); // set known altitude as reference
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void setAltOffset(int32_t _centimeters); // altitude offset
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void sethPaOffset(int32_t _Pa); // pressure offset
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void zeroCal(int32_t _Pa, int32_t _centimeters);// zero Calibrate output to a specific Pa/altitude
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// BMP Sensors
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void getPressure(int32_t *_Pa); // pressure in Pa + offset
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void getAltitude(int32_t *_centimeters); // altitude in centimeters + offset
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void getTemperature(int32_t *_Temperature); // temperature in C<>
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void calcTrueTemperature(); // calc temperature data b5 (only needed if AUTO_UPDATE_TEMPERATURE is false)
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void calcTruePressure(long *_TruePressure); // calc Pressure in Pa
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// dummy stuff
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void dumpCalData(); // debug only
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void writemem(uint8_t _addr, uint8_t _val);
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void readmem(uint8_t _addr, uint8_t _nbytes, uint8_t __buff[]);
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private:
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int ac1,ac2,ac3,b1,b2,mb,mc,md; // cal data
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unsigned int ac4,ac5,ac6; // cal data
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long b5, oldEMA; // temperature data
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uint8_t _dev_address;
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byte _buff[BUFFER_SIZE]; // buffer MSB LSB XLSB
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int _oss; // OverSamplingSetting
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int _pressure_waittime[4]; // Max. Conversion Time Pressure is ms for each mode
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int32_t _cm_Offset, _Pa_Offset;
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int32_t _param_datum, _param_centimeters;
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void getCalData();
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};
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#endif
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