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demo program of BMP085 pressure sensor
Diff: BMP085.h
- Revision:
- 2:8c00953d4755
diff -r 2935199329b2 -r 8c00953d4755 BMP085.h --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/BMP085.h Tue Nov 06 02:39:40 2012 +0000 @@ -0,0 +1,129 @@ +/* + * @file BMP085.h + * @author Tyler Weaver + * @author Kory Hill + * + * @section LICENSE + * + * 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. + * + * @section DESCRIPTION + * + * BMP085 I2C Temperature/Pressure/Altitude Sensor + * + * Max sample rate: 128 samples/second (temperature at 1/second) + * + * Datasheet: + * + * http://dlnmh9ip6v2uc.cloudfront.net/datasheets/Sensors/Pressure/BST-BMP085-DS000-06.pdf + */ + +#ifndef BMP085_H +#define BMP085_H + +#include "mbed.h" + +class BMP085 +{ +public: + /** + * The I2C address that can be passed directly to i2c object (it's already shifted 1 bit left). + */ + static const int16_t I2C_ADDRESS = 0xEE; //address of bmp085 + + /** + * Constructor. + * + * Calls init function + * + * @param sda - mbed pin to use for the SDA I2C line. + * @param scl - mbed pin to use for the SCL I2C line. + */ + BMP085(PinName sda, PinName scl); + + /** + * Constructor that accepts external i2c interface object. + * + * Calls init function + * + * @param i2c The I2C interface object to use. + */ + BMP085(I2C &i2c) : i2c_(i2c) { + init(); + } + + ~BMP085(); + + /** + * Sets the oss rate variables + * Acceptable values = 1,2,4,8 + * + *@param oss the number of over sampling + */ + void set_oss(int oss); + + int32_t get_temperature(); + int32_t get_pressure(); + double get_altitude_m(); + double get_altitude_ft(); + + /** + * Initialize sensor and get calibration values + */ + void init(); + + void display_cal_param(Serial *pc); + +protected: + + +private: + + I2C &i2c_; + + /** + * The raw buffer for allocating I2C object in its own without heap memory. + */ + char i2cRaw[sizeof(I2C)]; + + // calculation variables + int16_t AC1, AC2, AC3, B1, B2, MB, MC, MD; + uint16_t AC4, AC5, AC6; + + int32_t UT,UP; // uncompressed temperature and pressure value + + int32_t X1, X2, B5, temperature; // get_temperature variables + + int32_t B6, B3, X3, pressure; // get_pressure variables + uint32_t B4, B7; + + double altitude; + + // setting variables + char oss_bit_; + char oversampling_setting_; + float conversion_time_; + + void get_cal_param(); // get calibration parameters + void get_ut(); // get uncompressed temperature + void get_up(); // get uncompressed pressure + void write_char(char,char); + int16_t read_int16(char); + uint16_t read_uint16(char); + void read_multiple(char, char*, int); +}; + +#endif \ No newline at end of file