BMP085.h

00001 /*
00002   * mbed library to use a Bosch Sensortec BMP085 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 sensor
00009   * barometric pressure sensor BMP085 (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 over sampling setting
00020   */
00021  enum BMP085_oss {
00022      BMP085_oss1 = 0, ///< ultra low power (1 time)
00023      BMP085_oss2 = 1, ///< standard (2 times)
00024      BMP085_oss4 = 2, ///< high resolution (4 times)
00025      BMP085_oss8 = 3  ///< ultra high resolution (8 times)
00026  };
00027  
00028  /**
00029   * @brief BMP085 class
00030   */
00031  class BMP085 : public Base {
00032  public:
00033      BMP085(PinName p_sda, PinName p_scl, BMP085_oss p_oss = BMP085_oss1);
00034      BMP085(I2C& p_i2c, BMP085_oss p_oss = BMP085_oss1);
00035  
00036      float get_temperature();
00037      float get_pressure();
00038      void update();
00039  
00040  protected:
00041      void init(BMP085_oss);
00042      unsigned short twi_readshort (int, int);
00043      unsigned long twi_readlong (int, int);
00044      void twi_writechar (int, int, int);
00045  
00046      I2C i2c;
00047      float temperature;
00048      float pressure;
00049  
00050  private:
00051  
00052      short ac1, ac2, ac3, b1, b2, mb, mc, md, oss;
00053      unsigned short ac4, ac5, ac6;
00054  };
00055  
00056  #endif