Bosch BMP085 Barometric Pressure Sensor
Diff: bmp085.h
- Revision:
- 0:e8f53e502a4c
diff -r 000000000000 -r e8f53e502a4c bmp085.h --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/bmp085.h Thu Mar 19 03:46:13 2015 +0000 @@ -0,0 +1,118 @@ +/** +@file bmp085.h + +@brief Header file containing member functions and variables + +*/ + +#ifndef __BMP085_H__ +#define __BMP085_H__ + +#include "mbed.h" + +#define BMP085_I2C_ADDR_READ (0xEF) +#define BMP085_I2C_ADDR_WRITE (0xEE) + +#define CTRL_REG_ADDR (0xF4) +#define DATA_REG_ADDR (0xF6) + +#define MEASURE_TEMP_CMD (0x2E) +#define MEASURE_PRES_CMD (0x34) + +// MSB addresses, MSB first +#define CAL_DATA_AC1 (0xAA) +#define CAL_DATA_AC2 (0xAC) +#define CAL_DATA_AC3 (0xAE) +#define CAL_DATA_AC4 (0xB0) +#define CAL_DATA_AC5 (0xB2) +#define CAL_DATA_AC6 (0xB4) +#define CAL_DATA_B1 (0xB6) +#define CAL_DATA_B2 (0xB8) +#define CAL_DATA_MB (0xBA) +#define CAL_DATA_MC (0xBC) +#define CAL_DATA_MD (0xBE) + + +/** +@brief Simple library for interfacing with Bosch BMP085 + +@brief Revision 1.0 + +@author Tim Meese +@date January 2015 + * + * Example: + * @code + + #include "mbed.h" + #include "bmp085.h" + + + * @endcode + */ + + +class BMP085 +{ + +private: + + // I2C interface + I2C * i2c; + + const float p0 = 101325; // Pressure at sea level (Pa) + float altitude; + + // Calibration parameters + short AC1; + short AC2; + short AC3; + unsigned short AC4; + unsigned short AC5; + unsigned short AC6; + short B1; + short B2; + short MB; + short MC; + short MD; + + // uncalibrated temp, pressure + long UT; + long UP; + + // shared values + long X1; + long X2; + long X3; + long B3; + unsigned long B4; + long B5; + long B6; + unsigned long B7; + long T; // temp in 0.1 degrees C + long p; // pressure in Pascals + + void readCalData(); + void readUncompTemp(); + void readUncompPressure(int mode); + +public: + /** Create a BMP085 object connected to the specified pins + * + * @param clkPin Pin connected to clk + * @param dataPin Pin connected to data + * + */ + BMP085(PinName clkPin, PinName dataPin); + + /** Initialise SHT11 + * + */ + void init(); + float getTemperature(); + float getPressure(int oss); + long getUT(); + long getUP(); +}; + +#endif /* __BMP085_H__ */