/*
BME280.h - Header file for the BME280 Barometric Pressure Sensor Arduino Library.
Copyright (C) 2012 Love Electronics Ltd (loveelectronics.com)

This program is free software: you can redistribute it and/or modify
it under the terms of the version 3 GNU General Public License as
published by the Free Software Foundation.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program.  If not, see <http://www.gnu.org/licenses/>.

 Datasheet for BME280:
 http://www.bosch-sensortec.com/content/language1/downloads/BST-BMP180-DS000-07.pdf

*/

#ifndef BME280_h
#define BME280_h

#include <inttypes.h>

#include <Wire.h>

#define BME280_Address 0x76

#define ChipIdData 0x60

#define MeasureTemperature 0xFA

#define MeasurePressure 0xF7

#define MeasureHumidity 0xFD
#define ControlHumidity 0xF2



#define Reg_ChipId 0xD0
#define Reg_Version 0xD1
#define Reg_CAL26 0xE1 // R calibration stored in 0xE1-0xF0
#define Reg_Control 0xF4
#define Reg_Config 0xF5

#define Reg_CalibrationTStart 0x88
#define Reg_CalibrationTEnd 0x8D

#define Reg_CalibrationPStart 0x8E
#define Reg_CalibrationPEnd 0x9F

 enum
    {
  BME280_REG_DIG_H1              = 0xA1,
  BME280_REG_DIG_H2              = 0xE1,
  BME280_REG_DIG_H3              = 0xE3,
  BME280_REG_DIG_H4              = 0xE4,
  BME280_REG_DIG_H5              = 0xE5,
  BME280_REG_DIG_H6              = 0xE7,
    };
#define Reg_AnalogConverterOutMSB 0xF6
#define Reg_SoftReset 0xE0
#define SoftResetInstruction 0xB6

#define ErrorCode_1 "Entered sample resolution was invalid. See datasheet for details."
#define ErrorCode_1_Num 1


#define BME280_MODE_NORMAL			0x03 //reads sensors at set interval
#define BME280_MODE_FORCED			0x01 //reads sensors once when you write this register

class BME280
{
	public:
	  BME280();

	  void Initialize(void);

	  int32_t GetUncompensatedTemperature();
	  float CompensateTemperature(int32_t uncompensatedTemperature);

	  int32_t GetUncompensatedPressure();
	  float CompensatePressure(int32_t uncompensatedPressure);

	  int32_t GetUncompensatedHumidity();
	  float CompensateHumidity(int32_t uncompensatedHumidity);

	  float GetTemperature();
	  float GetPressure();
	  float GetHumidity();

	  //float GetAltitude(float currentSeaLevelPressureInPa);

	  void SoftReset();
	  uint8_t SetResolution(uint8_t sampleResolution, bool oversample);

	  void PrintCalibrationData();

	  uint8_t EnsureConnected();
	  uint8_t IsConnected;
	  const char* GetErrorText(int errorCode);
	protected:
	  void Write(int address, int byte);
	  uint8_t* Read(int address, int length);
	  void Read2(int address, int length, uint8_t buffer[]);
	private:
		uint8_t OversamplingSetting;
        bool Oversample;
		int16_t ConversionWaitTimeMs;
		int16_t LastTemperatureData;
		int16_t LastTemperatureTime;
		int16_t AcceptableTemperatureLatencyForPressure;


		uint16_t BME280_REGISTER_DIG_T1;
		int16_t BME280_REGISTER_DIG_T2;
		int16_t BME280_REGISTER_DIG_T3;

		uint16_t BME280_REGISTER_DIG_P1;
		int16_t BME280_REGISTER_DIG_P2;
		int16_t BME280_REGISTER_DIG_P3;
		int16_t BME280_REGISTER_DIG_P4;
		int16_t BME280_REGISTER_DIG_P5;
		int16_t BME280_REGISTER_DIG_P6;
		int16_t BME280_REGISTER_DIG_P7;
		int16_t BME280_REGISTER_DIG_P8;
		int16_t BME280_REGISTER_DIG_P9;

		uint8_t BME280_REGISTER_DIG_H1;
		int16_t BME280_REGISTER_DIG_H2;
		int8_t BME280_REGISTER_DIG_H3;
		int16_t BME280_REGISTER_DIG_H4;
		int16_t BME280_REGISTER_DIG_H5;
		int8_t BME280_REGISTER_DIG_H6;

        uint8_t buffer[64] = {0};
        int32_t t_fine = 0;
};
#endif