LPS331.h

#ifndef LPS331_h
#define LPS331_h

#include <Arduino.h> // for byte data type

// SA0 states

#define LPS331_SA0_LOW  0
#define LPS331_SA0_HIGH 1
#define LPS331_SA0_AUTO 2

// register addresses
// Note: Some of the register names in the datasheet are inconsistent
// between Table 14 in section 6 and the register descriptions in
// section 7. Where they differ, the names from section 7 have been
// used here.

#define LPS331_REF_P_XL       0x08
#define LPS331_REF_P_L        0x09
#define LPS331_REF_P_H        0x0A

#define LPS331_WHO_AM_I       0x0F

#define LPS331_RES_CONF       0x10

#define LPS331_CTRL_REG1      0x20
#define LPS331_CTRL_REG2      0x21
#define LPS331_CTRL_REG3      0x22
#define LPS331_INTERRUPT_CFG  0x23
#define LPS331_INT_SOURCE     0x24
#define LPS331_THS_P_L        0x25
#define LPS331_THS_P_H        0x26
#define LPS331_STATUS_REG     0x27

#define LPS331_PRESS_OUT_XL   0x28
#define LPS331_PRESS_OUT_L    0x29
#define LPS331_PRESS_OUT_H    0x2A

#define LPS331_TEMP_OUT_L     0x2B
#define LPS331_TEMP_OUT_H     0x2C

#define LPS331_AMP_CTRL       0x30

#define LPS331_DELTA_PRESS_XL 0x3C
#define LPS331_DELTA_PRESS_L  0x3D
#define LPS331_DELTA_PRESS_H  0x3E

// Some physical constants
#define LPS331_CELSIUS_TO_KELVIN_OFFSET 273.15

class LPS331
{
  public:
    LPS331(void);

    void begin();

    void writeReg(byte reg, byte value);
    byte readReg(byte reg);

    float readPressurePascals(void);
    float readPressureMillibars(void);
    float readPressureInchesHg(void);
    float readPressureMillimetersHg(void);
    int32_t readPressureRaw(void);
    float readTemperatureK(void);
    float readTemperatureC(void);
    float readTemperatureF(void);
    int16_t readTemperatureRaw(void);

    static float GOST4401_altitude(float pressure_pascals);
    static float pressureToAltitudeMeters(float pressure_mbar, float altimeter_setting_mbar = 1013.25);
    static float pressureToAltitudeFeet(float pressure_inHg, float altimeter_setting_inHg = 29.9213);

  private:
    byte address;

    bool autoDetectAddress(void);
    bool testWhoAmI(void);
};

#endif