1 /* 2 * Author: Yevgeniy Kiveisha <yevgeniy.kiveisha (at) intel.com> 3 * Contributions: Jon Trulson <jtrulson (at) ics.com> 4 * Copyright (c) 2014 Intel Corporation. 5 * 6 * Credits to Adafruit. 7 * Based on Adafruit BMP085 library. 8 * 9 * Permission is hereby granted, free of charge, to any person obtaining 10 * a copy of this software and associated documentation files (the 11 * "Software"), to deal in the Software without restriction, including 12 * without limitation the rights to use, copy, modify, merge, publish, 13 * distribute, sublicense, and/or sell copies of the Software, and to 14 * permit persons to whom the Software is furnished to do so, subject to 15 * the following conditions: 16 * 17 * The above copyright notice and this permission notice shall be 18 * included in all copies or substantial portions of the Software. 19 * 20 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 21 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 22 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 23 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE 24 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION 25 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION 26 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. 27 */ 28 #pragma once 29 30 #include <string> 31 #include <mraa/i2c.hpp> 32 #include <math.h> 33 34 #define ADDR 0x77 // device address 35 36 // registers address 37 #define BMP085_ULTRALOWPOWER 0 38 #define BMP085_STANDARD 1 39 #define BMP085_HIGHRES 2 40 #define BMP085_ULTRAHIGHRES 3 41 #define BMP085_CAL_AC1 0xAA // R Calibration data (16 bits) 42 #define BMP085_CAL_AC2 0xAC // R Calibration data (16 bits) 43 #define BMP085_CAL_AC3 0xAE // R Calibration data (16 bits) 44 #define BMP085_CAL_AC4 0xB0 // R Calibration data (16 bits) 45 #define BMP085_CAL_AC5 0xB2 // R Calibration data (16 bits) 46 #define BMP085_CAL_AC6 0xB4 // R Calibration data (16 bits) 47 #define BMP085_CAL_B1 0xB6 // R Calibration data (16 bits) 48 #define BMP085_CAL_B2 0xB8 // R Calibration data (16 bits) 49 #define BMP085_CAL_MB 0xBA // R Calibration data (16 bits) 50 #define BMP085_CAL_MC 0xBC // R Calibration data (16 bits) 51 #define BMP085_CAL_MD 0xBE // R Calibration data (16 bits) 52 53 #define BMP085_CONTROL 0xF4 54 #define BMP085_TEMPDATA 0xF6 55 #define BMP085_PRESSUREDATA 0xF6 56 #define BMP085_READTEMPCMD 0x2E 57 #define BMP085_READPRESSURECMD 0x34 58 59 #define HIGH 1 60 #define LOW 0 61 62 namespace upm { 63 64 /** 65 * @brief Bosch BMP & GY65 Atmospheric Pressure Sensor library 66 * @defgroup bmpx8x libupm-bmpx8x 67 * @ingroup seeed adafruit sparkfun i2c pressure 68 */ 69 70 /** 71 * @library bmpx8x 72 * @sensor bmpx8x 73 * @comname BMP Atmospheric Pressure Sensor 74 * @altname GY65 BMP085 BMP180 BMP183 75 * @type pressure 76 * @man seeed adafruit sparkfun 77 * @con i2c 78 * 79 * @brief API for the GY65/BMP085 and BMP180 Atmospheric Pressure Sensors 80 * 81 * Bosch GY65/BMP085 and BMP180 are high-precision, ultra-low 82 * power consumption pressure sensors. They operate in the range of 83 * 30,000-110,000 Pa. 84 * 85 * This module has been tested on the GY65/BMP085 and BMP180 sensors. 86 * 87 * @image html bmp085.jpeg 88 * @snippet bmpx8x.cxx Interesting 89 */ 90 91 class BMPX8X { 92 public: 93 /** 94 * Instantiates a BMPX8X object 95 * 96 * @param bus Number of the used bus 97 * @param devAddr Address of the used I2C device 98 * @param mode BMP085 mode 99 */ 100 BMPX8X (int bus, int devAddr=0x77, uint8_t mode=BMP085_ULTRAHIGHRES); 101 102 /** 103 * BMPX8X object destructor; basically, it closes the I2C connection. 104 * ~BMPX8X (); 105 * LE: there is no need for the destructor, as the I2C connection 106 * will be closed when the m_i2ControlCtx variable will go out of 107 * scope (when all the BMPX8X objects will be destroyed) 108 */ 109 /** 110 * Returns the calculated pressure 111 */ 112 int32_t getPressure (); 113 114 /** 115 * 116 * Gets raw pressure data 117 */ 118 int32_t getPressureRaw (); 119 120 /** 121 * Gets raw temperature data from the sensor 122 */ 123 int16_t getTemperatureRaw (); 124 125 /** 126 * Returns the calculated temperature 127 */ 128 float getTemperature (); 129 130 /** 131 * With a given absolute altitude, sea level can be calculated 132 * 133 * @param altitudeMeters Altitude 134 */ 135 int32_t getSealevelPressure(float altitudeMeters = 0); 136 137 /** 138 * With a given sea level, altitude in meters can be calculated 139 * 140 * @param sealevelPressure Sea level 141 */ 142 float getAltitude (float sealevelPressure = 101325); 143 144 /** 145 * Calculates B5 (check the spec for more information) 146 * 147 * @param UT 148 */ 149 int32_t computeB5 (int32_t UT); 150 151 /** 152 * Reads a two-byte register 153 * 154 * @param reg Address of the register 155 */ 156 uint16_t i2cReadReg_16 (int reg); 157 158 /** 159 * Writes to a one-byte register 160 * 161 * @param reg Address of the register 162 * @param value Byte to be written 163 */ 164 mraa::Result i2cWriteReg (uint8_t reg, uint8_t value); 165 166 /** 167 * Reads a one-byte register 168 * 169 * @param reg Address of the register 170 */ 171 uint8_t i2cReadReg_8 (int reg); 172 173 private: 174 std::string m_name; 175 176 int m_controlAddr; 177 int m_bus; 178 mraa::I2c m_i2ControlCtx; 179 180 uint8_t oversampling; 181 int16_t ac1, ac2, ac3, b1, b2, mb, mc, md; 182 uint16_t ac4, ac5, ac6; 183 }; 184 185 } 186
