/*!
 * @file Adafruit_BMP183.h
 */

#ifndef ADAFRUIT_BMP183_H
#define ADAFRUIT_BMP183_H

#include "Arduino.h"
#include "SPI.h"

// use the 'default' datasheet numbers to test calculations
#define BMP183_DEBUG 0 //!< Enables or disables debug mode

/** Registers **/
enum {
  BMP183_REGISTER_CAL_AC1 = 0xAA, // R   Calibration data (16 bits)
  BMP183_REGISTER_CAL_AC2 = 0xAC, // R   Calibration data (16 bits)
  BMP183_REGISTER_CAL_AC3 = 0xAE, // R   Calibration data (16 bits)
  BMP183_REGISTER_CAL_AC4 = 0xB0, // R   Calibration data (16 bits)
  BMP183_REGISTER_CAL_AC5 = 0xB2, // R   Calibration data (16 bits)
  BMP183_REGISTER_CAL_AC6 = 0xB4, // R   Calibration data (16 bits)
  BMP183_REGISTER_CAL_B1 = 0xB6,  // R   Calibration data (16 bits)
  BMP183_REGISTER_CAL_B2 = 0xB8,  // R   Calibration data (16 bits)
  BMP183_REGISTER_CAL_MB = 0xBA,  // R   Calibration data (16 bits)
  BMP183_REGISTER_CAL_MC = 0xBC,  // R   Calibration data (16 bits)
  BMP183_REGISTER_CAL_MD = 0xBE,  // R   Calibration data (16 bits)
  BMP183_REGISTER_CHIPID = 0xD0,
  BMP183_REGISTER_VERSION = 0xD1,
  BMP183_REGISTER_SOFTRESET = 0xE0,
  BMP183_REGISTER_CONTROL = 0xF4,
  BMP183_REGISTER_TEMPDATA = 0xF6,
  BMP183_REGISTER_PRESSUREDATA = 0xF6,
  BMP183_REGISTER_READTEMPCMD = 0x2E,
  BMP183_REGISTER_READPRESSURECMD = 0x34
};

/** Mode Settings **/
typedef enum {
  BMP183_MODE_ULTRALOWPOWER = 0,
  BMP183_MODE_STANDARD = 1,
  BMP183_MODE_HIGHRES = 2,
  BMP183_MODE_ULTRAHIGHRES = 3
} bmp183_mode_t;

/*!
 *  @brief  Class that stores state and functions for interacting with
 *          BMP183
 */
class Adafruit_BMP183 {
public:
  Adafruit_BMP183(int8_t SPICS, SPIClass *theSPI = &SPI);
  Adafruit_BMP183(int8_t SPICLK, int8_t SPIMISO, int8_t SPIMOSI, int8_t SPICS);

  boolean
  begin(bmp183_mode_t mode = BMP183_MODE_ULTRAHIGHRES); // by default go highres
  float getTemperature();
  int32_t getPressure();
  float getAltitude(float sealevelPressure = 101325); // std atmosphere
  uint16_t readRawTemperature();
  uint32_t readRawPressure();
  SPIClass *_spi; //!< pointer to SPI object

private:
  uint8_t SPIxfer(uint8_t x);
  uint8_t read8(uint8_t addr);
  uint16_t read16(uint8_t addr);
  void write8(uint8_t addr, uint8_t data);

  int8_t _cs, _clk, _miso, _mosi;

  uint8_t oversampling;

  int16_t ac1, ac2, ac3, b1, b2, mb, mc, md;
  uint16_t ac4, ac5, ac6;
};

#endif //  ADAFRUIT_BMP183_H