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123 lines
4.7 KiB
123 lines
4.7 KiB
/***************************************************************************
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This is a library for the BMP085 pressure sensor
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Designed specifically to work with the Adafruit BMP085 or BMP180 Breakout
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----> http://www.adafruit.com/products/391
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----> http://www.adafruit.com/products/1603
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These displays use I2C to communicate, 2 pins are required to interface.
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Adafruit invests time and resources providing this open source code,
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please support Adafruit andopen-source hardware by purchasing products
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from Adafruit!
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Written by Kevin Townsend for Adafruit Industries.
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BSD license, all text above must be included in any redistribution
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***************************************************************************/
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#ifndef __BMP085_H__
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#define __BMP085_H__
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#if (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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#include <Adafruit_Sensor.h>
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#ifdef __AVR_ATtiny85__
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#include "TinyWireM.h"
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#define Wire TinyWireM
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#else
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#include <Wire.h>
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#endif
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/*=========================================================================
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I2C ADDRESS/BITS
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-----------------------------------------------------------------------*/
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#define BMP085_ADDRESS (0x77)
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/*=========================================================================*/
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/*=========================================================================
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REGISTERS
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-----------------------------------------------------------------------*/
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enum
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{
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BMP085_REGISTER_CAL_AC1 = 0xAA, // R Calibration data (16 bits)
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BMP085_REGISTER_CAL_AC2 = 0xAC, // R Calibration data (16 bits)
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BMP085_REGISTER_CAL_AC3 = 0xAE, // R Calibration data (16 bits)
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BMP085_REGISTER_CAL_AC4 = 0xB0, // R Calibration data (16 bits)
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BMP085_REGISTER_CAL_AC5 = 0xB2, // R Calibration data (16 bits)
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BMP085_REGISTER_CAL_AC6 = 0xB4, // R Calibration data (16 bits)
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BMP085_REGISTER_CAL_B1 = 0xB6, // R Calibration data (16 bits)
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BMP085_REGISTER_CAL_B2 = 0xB8, // R Calibration data (16 bits)
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BMP085_REGISTER_CAL_MB = 0xBA, // R Calibration data (16 bits)
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BMP085_REGISTER_CAL_MC = 0xBC, // R Calibration data (16 bits)
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BMP085_REGISTER_CAL_MD = 0xBE, // R Calibration data (16 bits)
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BMP085_REGISTER_CHIPID = 0xD0,
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BMP085_REGISTER_VERSION = 0xD1,
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BMP085_REGISTER_SOFTRESET = 0xE0,
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BMP085_REGISTER_CONTROL = 0xF4,
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BMP085_REGISTER_TEMPDATA = 0xF6,
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BMP085_REGISTER_PRESSUREDATA = 0xF6,
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BMP085_REGISTER_READTEMPCMD = 0x2E,
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BMP085_REGISTER_READPRESSURECMD = 0x34
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};
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/*=========================================================================*/
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/*=========================================================================
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MODE SETTINGS
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-----------------------------------------------------------------------*/
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typedef enum
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{
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BMP085_MODE_ULTRALOWPOWER = 0,
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BMP085_MODE_STANDARD = 1,
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BMP085_MODE_HIGHRES = 2,
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BMP085_MODE_ULTRAHIGHRES = 3
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} bmp085_mode_t;
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/*=========================================================================*/
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/*=========================================================================
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CALIBRATION DATA
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-----------------------------------------------------------------------*/
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typedef struct
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{
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int16_t ac1;
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int16_t ac2;
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int16_t ac3;
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uint16_t ac4;
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uint16_t ac5;
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uint16_t ac6;
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int16_t b1;
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int16_t b2;
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int16_t mb;
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int16_t mc;
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int16_t md;
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} bmp085_calib_data;
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/*=========================================================================*/
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class Adafruit_BMP085_Unified : public Adafruit_Sensor
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{
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public:
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Adafruit_BMP085_Unified(int32_t sensorID = -1);
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bool begin(bmp085_mode_t mode = BMP085_MODE_ULTRAHIGHRES);
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void getTemperature(float *temp);
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void getPressure(float *pressure);
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float pressureToAltitude(float seaLvel, float atmospheric);
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float seaLevelForAltitude(float altitude, float atmospheric);
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// Note that the next two functions are just for compatibility with old
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// code that passed the temperature as a third parameter. A newer
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// calculation is used which does not need temperature.
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float pressureToAltitude(float seaLevel, float atmospheric, float temp);
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float seaLevelForAltitude(float altitude, float atmospheric, float temp);
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void getEvent(sensors_event_t*);
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void getSensor(sensor_t*);
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private:
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int32_t computeB5(int32_t ut);
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int32_t _sensorID;
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};
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#endif
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