Tyler Weaver / BMP085

Pressure, Temperature, Altitude Sensor on breakout from sparkfun (I2C)

BMP085.h@0:0b4c4632aeb0, 2012-12-12 (annotated)

Committer:
tylerjw
Date:
Wed Dec 12 16:30:14 2012 +0000
Revision:
0:0b4c4632aeb0
initial;

Who changed what in which revision?

UserRevisionLine numberNew contents of line
tylerjw 0:0b4c4632aeb0 1 /*
tylerjw 0:0b4c4632aeb0 2 * @file BMP085.h
tylerjw 0:0b4c4632aeb0 3 * @author Tyler Weaver
tylerjw 0:0b4c4632aeb0 4 * @author Kory Hill
tylerjw 0:0b4c4632aeb0 5 *
tylerjw 0:0b4c4632aeb0 6 * @section LICENSE
tylerjw 0:0b4c4632aeb0 7 *
tylerjw 0:0b4c4632aeb0 8 * Permission is hereby granted, free of charge, to any person obtaining a copy of this software
tylerjw 0:0b4c4632aeb0 9 * and associated documentation files (the "Software"), to deal in the Software without restriction,
tylerjw 0:0b4c4632aeb0 10 * including without limitation the rights to use, copy, modify, merge, publish, distribute,
tylerjw 0:0b4c4632aeb0 11 * sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is
tylerjw 0:0b4c4632aeb0 12 * furnished to do so, subject to the following conditions:
tylerjw 0:0b4c4632aeb0 13 *
tylerjw 0:0b4c4632aeb0 14 * The above copyright notice and this permission notice shall be included in all copies or
tylerjw 0:0b4c4632aeb0 15 * substantial portions of the Software.
tylerjw 0:0b4c4632aeb0 16 *
tylerjw 0:0b4c4632aeb0 17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING
tylerjw 0:0b4c4632aeb0 18 * BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
tylerjw 0:0b4c4632aeb0 19 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
tylerjw 0:0b4c4632aeb0 20 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
tylerjw 0:0b4c4632aeb0 21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
tylerjw 0:0b4c4632aeb0 22 *
tylerjw 0:0b4c4632aeb0 23 * @section DESCRIPTION
tylerjw 0:0b4c4632aeb0 24 *
tylerjw 0:0b4c4632aeb0 25 * BMP085 I2C Temperature/Pressure/Altitude Sensor
tylerjw 0:0b4c4632aeb0 26 *
tylerjw 0:0b4c4632aeb0 27 * Max sample rate: 128 samples/second (temperature at 1/second)
tylerjw 0:0b4c4632aeb0 28 *
tylerjw 0:0b4c4632aeb0 29 * Datasheet:
tylerjw 0:0b4c4632aeb0 30 *
tylerjw 0:0b4c4632aeb0 31 * http://dlnmh9ip6v2uc.cloudfront.net/datasheets/Sensors/Pressure/BST-BMP085-DS000-06.pdf
tylerjw 0:0b4c4632aeb0 32 */
tylerjw 0:0b4c4632aeb0 33
tylerjw 0:0b4c4632aeb0 34 #ifndef BMP085_H
tylerjw 0:0b4c4632aeb0 35 #define BMP085_H
tylerjw 0:0b4c4632aeb0 36
tylerjw 0:0b4c4632aeb0 37 #include "mbed.h"
tylerjw 0:0b4c4632aeb0 38
tylerjw 0:0b4c4632aeb0 39 class BMP085
tylerjw 0:0b4c4632aeb0 40 {
tylerjw 0:0b4c4632aeb0 41 public:
tylerjw 0:0b4c4632aeb0 42 /**
tylerjw 0:0b4c4632aeb0 43 * The I2C address that can be passed directly to i2c object (it's already shifted 1 bit left).
tylerjw 0:0b4c4632aeb0 44 */
tylerjw 0:0b4c4632aeb0 45 static const int16_t I2C_ADDRESS = 0xEE; //address of bmp085
tylerjw 0:0b4c4632aeb0 46
tylerjw 0:0b4c4632aeb0 47 /**
tylerjw 0:0b4c4632aeb0 48 * Constructor.
tylerjw 0:0b4c4632aeb0 49 *
tylerjw 0:0b4c4632aeb0 50 * Calls init function
tylerjw 0:0b4c4632aeb0 51 *
tylerjw 0:0b4c4632aeb0 52 * @param sda - mbed pin to use for the SDA I2C line.
tylerjw 0:0b4c4632aeb0 53 * @param scl - mbed pin to use for the SCL I2C line.
tylerjw 0:0b4c4632aeb0 54 */
tylerjw 0:0b4c4632aeb0 55 BMP085(PinName sda, PinName scl);
tylerjw 0:0b4c4632aeb0 56
tylerjw 0:0b4c4632aeb0 57 /**
tylerjw 0:0b4c4632aeb0 58 * Constructor that accepts external i2c interface object.
tylerjw 0:0b4c4632aeb0 59 *
tylerjw 0:0b4c4632aeb0 60 * Calls init function
tylerjw 0:0b4c4632aeb0 61 *
tylerjw 0:0b4c4632aeb0 62 * @param i2c The I2C interface object to use.
tylerjw 0:0b4c4632aeb0 63 */
tylerjw 0:0b4c4632aeb0 64 BMP085(I2C &i2c) : i2c_(i2c) {
tylerjw 0:0b4c4632aeb0 65 init();
tylerjw 0:0b4c4632aeb0 66 }
tylerjw 0:0b4c4632aeb0 67
tylerjw 0:0b4c4632aeb0 68 ~BMP085();
tylerjw 0:0b4c4632aeb0 69
tylerjw 0:0b4c4632aeb0 70 /**
tylerjw 0:0b4c4632aeb0 71 * Sets the oss rate variables
tylerjw 0:0b4c4632aeb0 72 * Acceptable values = 1,2,4,8
tylerjw 0:0b4c4632aeb0 73 *
tylerjw 0:0b4c4632aeb0 74 *@param oss the number of over sampling
tylerjw 0:0b4c4632aeb0 75 */
tylerjw 0:0b4c4632aeb0 76 void set_oss(int oss);
tylerjw 0:0b4c4632aeb0 77
tylerjw 0:0b4c4632aeb0 78 int32_t get_temperature();
tylerjw 0:0b4c4632aeb0 79 int32_t get_pressure();
tylerjw 0:0b4c4632aeb0 80 double get_altitude_m();
tylerjw 0:0b4c4632aeb0 81 double get_altitude_ft();
tylerjw 0:0b4c4632aeb0 82
tylerjw 0:0b4c4632aeb0 83 /**
tylerjw 0:0b4c4632aeb0 84 * Initialize sensor and get calibration values
tylerjw 0:0b4c4632aeb0 85 */
tylerjw 0:0b4c4632aeb0 86 void init();
tylerjw 0:0b4c4632aeb0 87
tylerjw 0:0b4c4632aeb0 88 void display_cal_param(Serial *pc);
tylerjw 0:0b4c4632aeb0 89
tylerjw 0:0b4c4632aeb0 90 protected:
tylerjw 0:0b4c4632aeb0 91
tylerjw 0:0b4c4632aeb0 92
tylerjw 0:0b4c4632aeb0 93 private:
tylerjw 0:0b4c4632aeb0 94
tylerjw 0:0b4c4632aeb0 95 I2C &i2c_;
tylerjw 0:0b4c4632aeb0 96
tylerjw 0:0b4c4632aeb0 97 /**
tylerjw 0:0b4c4632aeb0 98 * The raw buffer for allocating I2C object in its own without heap memory.
tylerjw 0:0b4c4632aeb0 99 */
tylerjw 0:0b4c4632aeb0 100 char i2cRaw[sizeof(I2C)];
tylerjw 0:0b4c4632aeb0 101
tylerjw 0:0b4c4632aeb0 102 // calculation variables
tylerjw 0:0b4c4632aeb0 103 int16_t AC1, AC2, AC3, B1, B2, MB, MC, MD;
tylerjw 0:0b4c4632aeb0 104 uint16_t AC4, AC5, AC6;
tylerjw 0:0b4c4632aeb0 105
tylerjw 0:0b4c4632aeb0 106 int32_t UT,UP; // uncompressed temperature and pressure value
tylerjw 0:0b4c4632aeb0 107
tylerjw 0:0b4c4632aeb0 108 int32_t X1, X2, B5, temperature; // get_temperature variables
tylerjw 0:0b4c4632aeb0 109
tylerjw 0:0b4c4632aeb0 110 int32_t B6, B3, X3, pressure; // get_pressure variables
tylerjw 0:0b4c4632aeb0 111 uint32_t B4, B7;
tylerjw 0:0b4c4632aeb0 112
tylerjw 0:0b4c4632aeb0 113 double altitude;
tylerjw 0:0b4c4632aeb0 114
tylerjw 0:0b4c4632aeb0 115 // setting variables
tylerjw 0:0b4c4632aeb0 116 char oss_bit_;
tylerjw 0:0b4c4632aeb0 117 char oversampling_setting_;
tylerjw 0:0b4c4632aeb0 118 float conversion_time_;
tylerjw 0:0b4c4632aeb0 119
tylerjw 0:0b4c4632aeb0 120 void get_cal_param(); // get calibration parameters
tylerjw 0:0b4c4632aeb0 121 void get_ut(); // get uncompressed temperature
tylerjw 0:0b4c4632aeb0 122 void get_up(); // get uncompressed pressure
tylerjw 0:0b4c4632aeb0 123 void write_char(char,char);
tylerjw 0:0b4c4632aeb0 124 int16_t read_int16(char);
tylerjw 0:0b4c4632aeb0 125 uint16_t read_uint16(char);
tylerjw 0:0b4c4632aeb0 126 void read_multiple(char, char*, int);
tylerjw 0:0b4c4632aeb0 127 };
tylerjw 0:0b4c4632aeb0 128
tylerjw 0:0b4c4632aeb0 129 #endif