ZUNO_BMP280.h

/*
    BMP280.h
    Bosch BMP280 pressure sensor library for the Arduino microcontroller.
    This library uses I2C connection.

    Uses floating-point equations from BMP280 datasheet.

    modified by mhafuzul islam

    version 1.01         16/9/2014 initial version

    Our example code uses the "pizza-eating" license. You can do anything
    you like with this code. No really, anything. If you find it useful,
    buy me italian pizza someday.
*/

#ifndef BMP280_h
#define BMP280_h

#include "Arduino.h"

// #define _debugSerial
// #define _debugTestData

class BMP280
{
    public:
        BMP280(); // base type

        char begin();
        char begin(int sdaPin, int sclPin);
            // call pressure.begin() to initialize BMP280 before use
            // returns 1 if success, 0 if failure (i2C connection problem.)

        short getOversampling(void);
        char  setOversampling(short oss);

        char startMeasurment(void);
            // command BMP280 to start a pressure measurement
            // oversampling: 0 - 3 for oversampling value
            // returns (number of ms to wait) for success, 0 for fail

        //char calcTemperature(double &T, double &uT);
            // calculation the true temperature from the given uncalibrated Temperature

        //char calcPressure(double &P, double uP);
            //calculation for measuring pressure.

        double sealevel(double P, double A);
            // convert absolute pressure to sea-level pressure
            // P: absolute pressure (mbar)
            // A: current altitude (meters)
            // returns sealevel pressure in mbar

        double altitude(double P, double P0);
            // convert absolute pressure to altitude (given baseline pressure; sea-level, runway, etc.)
            // P: absolute pressure (mbar)
            // P0: fixed baseline pressure (mbar)
            // returns signed altitude in meters

        char getError(void);
            // If any library command fails, you can retrieve an extended
            // error code using this command. Errors are from the wire library:
            // 0 = Success
            // 1 = Data too long to fit in transmit buffer
            // 2 = Received NACK on transmit of address
            // 3 = Received NACK on transmit of data
            // 4 = Other error

        char getTemperatureAndPressure(double& T,double& P);

    private:



        char readInt(char address, double &value);
            // read an signed int (16 bits) from a BMP280 register
            // address: BMP280 register address
            // value: external signed int for returned value (16 bits)
            // returns 1 for success, 0 for fail, with result in value

        char readUInt(char address, double &value);
            // read an unsigned int (16 bits) from a BMP280 register
            // address: BMP280 register address
            // value: external unsigned int for returned value (16 bits)
            // returns 1 for success, 0 for fail, with result in value

        char readBytes(unsigned char *values, char length);
            // read a number of bytes from a BMP280 register
            // values: array of char with register address in first location [0]
            // length: number of bytes to read back
            // returns 1 for success, 0 for fail, with read bytes in values[] array

        char writeBytes(unsigned char *values, char length);
            // write a number of bytes to a BMP280 register (and consecutive subsequent registers)
            // values: array of char with register address in first location [0]
            // length: number of bytes to write
            // returns 1 for success, 0 for fail

        //char getUnPT(double &uP, double &uT);
            //get uncalibrated UP and UT value.

        char readCalibration();
            // Retrieve calibration data from device:
            // The BMP280 includes factory calibration data stored on the device.
            // Each device has different numbers, these must be retrieved and
            // used in the calculations when taking measurements.


        //int dig_T2 , dig_T3 , dig_T4 , dig_P2 , dig_P3, dig_P4, dig_P5, dig_P6, dig_P7, dig_P8, dig_P9;
        //unsigned int dig_P1 , dig_T1 ;
        double dig_T1, dig_T2 , dig_T3 , dig_T4 , dig_P1, dig_P2 , dig_P3, dig_P4, dig_P5, dig_P6, dig_P7, dig_P8, dig_P9;
        short oversampling, oversampling_t;
        double t_fine;
        char error;
};

#define BMP280_ADDR 0x76 // 7-bit address

#define BMP280_REG_CONTROL 0xF4
#define BMP280_REG_RESULT_PRESSURE 0xF7         // 0xF7(msb) , 0xF8(lsb) , 0xF9(xlsb) : stores the pressure data.
#define BMP280_REG_RESULT_TEMPRERATURE 0xFA     // 0xFA(msb) , 0xFB(lsb) , 0xFC(xlsb) : stores the temperature data.

#define BMP280_COMMAND_TEMPERATURE 0x2E
#define BMP280_COMMAND_PRESSURE0 0x25
#define BMP280_COMMAND_PRESSURE1 0x29
#define BMP280_COMMAND_PRESSURE2 0x2D
#define BMP280_COMMAND_PRESSURE3 0x31
#define BMP280_COMMAND_PRESSURE4 0x5D

#endif