BMP085.h

00001 /*
00002  * mbed library to use a Bosch Sensortec BMP085/BMP180 sensor
00003  * Copyright (c) 2010 Hiroshi Suga
00004  * Released under the MIT License: http://mbed.org/license/mit
00005  */
00006  
00007 /** @file BMP085.h
00008  * @brief mbed library to use a Bosch Sensortec BMP085/BMP180 sensor
00009  * barometric pressure sensor BMP085/BMP180 (Bosch Sensortec)
00010  * interface: I2C digital
00011  */
00012  
00013 #ifndef BMP085_H
00014 #define BMP085_H
00015 
00016 #include "mbed.h"
00017 
00018 /*
00019 * @brief Pressure at sea level
00020 */
00021 #define SEA_PRES 1013.25f 
00022 
00023 /**
00024  * @brief over sampling setting
00025  */
00026 enum BMP085_oss {
00027     BMP085_oss1 = 0, ///< ultra low power (1 time)
00028     BMP085_oss2 = 1, ///< standard (2 times)
00029     BMP085_oss4 = 2, ///< high resolution (4 times)
00030     BMP085_oss8 = 3  ///< ultra high resolution (8 times)
00031 };
00032 
00033 /**
00034  * @brief BMP085 class
00035  */
00036 class BMP085 {
00037 public:
00038     BMP085(PinName p_sda, PinName p_scl, BMP085_oss p_oss = BMP085_oss1);
00039     BMP085(I2C& p_i2c, BMP085_oss p_oss = BMP085_oss1);
00040 
00041     float get_temperature();
00042     float get_pressure();
00043     void update();
00044 
00045 protected:
00046     void init(BMP085_oss);
00047     unsigned short twi_readshort (int, int);
00048     unsigned long twi_readlong (int, int);
00049     void twi_writechar (int, int, int);
00050 
00051     I2C i2c;
00052     float temperature;
00053     float pressure;
00054 
00055 private:
00056 
00057     short ac1, ac2, ac3, b1, b2, mb, mc, md, oss;
00058     unsigned short ac4, ac5, ac6;
00059 };
00060 
00061 #endif