/***************************************************************************
  This is a library for the BMP280 pressure sensor

  Designed specifically to work with the Adafruit BMP280 Breakout
  ----> http://www.adafruit.com/products/2651

  These sensors use I2C to communicate, 2 pins are required to interface.

  Adafruit invests time and resources providing this open source code,
  please support Adafruit andopen-source hardware by purchasing products
  from Adafruit!

  Written by Kevin Townsend for Adafruit Industries.
  BSD license, all text above must be included in any redistribution
 ***************************************************************************/
#ifndef __BMP280_H__
#define __BMP280_H__

#if (ARDUINO >= 100)
 #include "Arduino.h"
#else
 #include "WProgram.h"
#endif

#include <Adafruit_Sensor.h>

#ifdef __AVR_ATtiny85__
 #include "TinyWireM.h"
 #define Wire TinyWireM
#else
 #include <Wire.h>
#endif

/*=========================================================================
    I2C ADDRESS/BITS/SETTINGS
    -----------------------------------------------------------------------*/
    #define BMP280_ADDRESS                (0x76)
    #define BMP280_CHIPID                 (0x58)
/*=========================================================================*/

/*=========================================================================
    REGISTERS
    -----------------------------------------------------------------------*/
    enum
    {
      BMP280_REGISTER_DIG_T1              = 0x88,
      BMP280_REGISTER_DIG_T2              = 0x8A,
      BMP280_REGISTER_DIG_T3              = 0x8C,

      BMP280_REGISTER_DIG_P1              = 0x8E,
      BMP280_REGISTER_DIG_P2              = 0x90,
      BMP280_REGISTER_DIG_P3              = 0x92,
      BMP280_REGISTER_DIG_P4              = 0x94,
      BMP280_REGISTER_DIG_P5              = 0x96,
      BMP280_REGISTER_DIG_P6              = 0x98,
      BMP280_REGISTER_DIG_P7              = 0x9A,
      BMP280_REGISTER_DIG_P8              = 0x9C,
      BMP280_REGISTER_DIG_P9              = 0x9E,

      BMP280_REGISTER_CHIPID             = 0xD0,
      BMP280_REGISTER_VERSION            = 0xD1,
      BMP280_REGISTER_SOFTRESET          = 0xE0,

      BMP280_REGISTER_CAL26              = 0xE1,  // R calibration stored in 0xE1-0xF0

      BMP280_REGISTER_CONTROL            = 0xF4,
      BMP280_REGISTER_CONFIG             = 0xF5,
      BMP280_REGISTER_PRESSUREDATA       = 0xF7,
      BMP280_REGISTER_TEMPDATA           = 0xFA,
    };

/*=========================================================================*/

/*=========================================================================
    CALIBRATION DATA
    -----------------------------------------------------------------------*/
    typedef struct
    {
      uint16_t dig_T1;
      int16_t  dig_T2;
      int16_t  dig_T3;

      uint16_t dig_P1;
      int16_t  dig_P2;
      int16_t  dig_P3;
      int16_t  dig_P4;
      int16_t  dig_P5;
      int16_t  dig_P6;
      int16_t  dig_P7;
      int16_t  dig_P8;
      int16_t  dig_P9;

      uint8_t  dig_H1;
      int16_t  dig_H2;
      uint8_t  dig_H3;
      int16_t  dig_H4;
      int16_t  dig_H5;
      int8_t   dig_H6;
    } bmp280_calib_data;
/*=========================================================================*/

/*
class Adafruit_BMP280_Unified : public Adafruit_Sensor
{
  public:
    Adafruit_BMP280_Unified(int32_t sensorID = -1);

    bool  begin(uint8_t addr = BMP280_ADDRESS, uint8_t chipid = BMP280_CHIPID);
    void  getTemperature(float *temp);
    void  getPressure(float *pressure);
    float pressureToAltitude(float seaLevel, float atmospheric, float temp);
    float seaLevelForAltitude(float altitude, float atmospheric, float temp);
    void  getEvent(sensors_event_t*);
    void  getSensor(sensor_t*);

  private:
    uint8_t   _i2c_addr;
    int32_t   _sensorID;
};

*/

class Adafruit_BMP280
{
  public:
    Adafruit_BMP280();
    Adafruit_BMP280(int8_t cspin);
    Adafruit_BMP280(int8_t cspin, int8_t mosipin, int8_t misopin, int8_t sckpin);

    bool  begin(uint8_t addr = BMP280_ADDRESS, uint8_t chipid = BMP280_CHIPID);
    float readTemperature(void);
    float readPressure(void);
    float readAltitude(float seaLevelhPa = 1013.25);

  private:

    void readCoefficients(void);
    uint8_t spixfer(uint8_t x);

    void      write8(byte reg, byte value);
    uint8_t   read8(byte reg);
    uint16_t  read16(byte reg);
    uint32_t  read24(byte reg);
    int16_t   readS16(byte reg);
    uint16_t  read16_LE(byte reg); // little endian
    int16_t   readS16_LE(byte reg); // little endian

    uint8_t   _i2caddr;
    int32_t   _sensorID;
    int32_t t_fine;

    int8_t _cs, _mosi, _miso, _sck;

    bmp280_calib_data _bmp280_calib;

};

#endif