Barometer.h

00001 #ifndef Barometer_H
00002 #define Barometer_H
00003 #include "mbed.h"
00004  
00005 
00006 enum Barometer_oss {
00007     Barometer_oss1 = 0, ///< ultra low power (1 time)
00008     Barometer_oss2 = 1, ///< standard (2 times)
00009     Barometer_oss4 = 2, ///< high resolution (4 times)
00010     Barometer_oss8 = 3  ///< ultra high resolution (8 times)
00011 };
00012  
00013 
00014 class Barometer {
00015 public:
00016     Barometer(PinName p_sda, PinName p_scl, Barometer_oss p_oss = Barometer_oss8);
00017     Barometer(I2C& p_i2c, Barometer_oss p_oss = Barometer_oss8);
00018  
00019     float get_temperature();
00020     float get_pressure();
00021     float get_altitude_m();
00022     void update();
00023  
00024 protected:
00025     void init(Barometer_oss);
00026     unsigned short twi_readshort (int, int);
00027     unsigned long twi_readlong (int, int);
00028     void twi_writechar (int, int, int);
00029  
00030     I2C i2c;
00031     float temperature;
00032     float pressure;
00033     float altitude;
00034  
00035 private:
00036  
00037     short ac1, ac2, ac3, b1, b2, mb, mc, md, oss;
00038     unsigned short ac4, ac5, ac6;
00039 };
00040  
00041 #endif