/*!
 * @file Adafruit_BMP183_U.h
 *
 * Designed specifically to work with the Adafruit BMP183 Breakout
 * ----> http://www.adafruit.com/products/1900
 *
 * These sensors use SPI to communicate, 4 pins are required
 * to interface.
 *
 * Adafruit invests time and resources providing this open source code,
 * please support Adafruit and open-source hardware by purchasing
 * products from Adafruit!
 *
 * Written by Kevin Townsend "KTOWN" for Adafruit Industries.
 *
 * BSD license, all text here must be included in any redistribution.
 *
 */
#ifndef __BMP183_H__
#define __BMP183_H__

#include "Arduino.h"

#include <Adafruit_Sensor.h>
#include <SPI.h>

/** 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;

/** Calibration Data **/
typedef struct {
  int16_t ac1;  /**< Calibration coefficient (ac1) **/
  int16_t ac2;  /**< Calibration coefficient (ac2) **/
  int16_t ac3;  /**< Calibration coefficient (ac3) **/
  uint16_t ac4; /**< Calibration coefficient (ac4) **/
  uint16_t ac5; /**< Calibration coefficient (ac5) **/
  uint16_t ac6; /**< Calibration coefficient (ac6) **/
  int16_t b1;   /**< Calibration coefficient (b1) **/
  int16_t b2;   /**< Calibration coefficient (b2) **/
  int16_t mb;   /**< Calibration coefficient (mb) **/
  int16_t mc;   /**< Calibration coefficient (mc) **/
  int16_t md;   /**< Calibration coefficient (md) **/
} bmp183_calib_data;

/*!
 *  @brief  Class that stores state and functions for interacting with
 *          BMP183
 */
class Adafruit_BMP183_Unified : public Adafruit_Sensor {
public:
  Adafruit_BMP183_Unified(int8_t SPICLK, int8_t SPIMISO, int8_t SPIMOSI,
                          int8_t SPICS, int32_t sensorID = -1);
  Adafruit_BMP183_Unified(int8_t SPICS, int32_t sensorID = -1,
                          SPIClass *theSPI = &SPI);

  bool begin(bmp183_mode_t mode = BMP183_MODE_ULTRAHIGHRES);
  float getTemperature();
  float getPressure();
  float pressureToAltitude(float seaLevel, float atmospheric, float temp);
  float seaLevelForAltitude(float altitude, float atmospheric, float temp);
  bool getEvent(sensors_event_t *);
  void getSensor(sensor_t *);

private:
  void readCoefficients(void);
  int16_t readRawTemperature();
  int32_t readRawPressure();

  uint8_t read8(byte reg);
  int16_t readS16(byte reg);
  uint16_t read16(byte reg);
  void writeCommand(byte reg, byte value);

  uint8_t SPIxfer(uint8_t x);

  int32_t _sensorID;
  bmp183_calib_data _bmp183_coeffs;
  uint8_t _bmp183Mode;

  int8_t _cs, _clk, _miso, _mosi;
};

#endif