

// Test derived class for base class SparkFunIMU
#ifndef __BME280_H__
#define __BME280_H__

#include "stdint.h"

#define I2C_MODE 0
#define SPI_MODE 1

//Register names:
#define BME280_DIG_T1_LSB_REG			0x88
#define BME280_DIG_T1_MSB_REG			0x89
#define BME280_DIG_T2_LSB_REG			0x8A
#define BME280_DIG_T2_MSB_REG			0x8B
#define BME280_DIG_T3_LSB_REG			0x8C
#define BME280_DIG_T3_MSB_REG			0x8D
#define BME280_DIG_P1_LSB_REG			0x8E
#define BME280_DIG_P1_MSB_REG			0x8F
#define BME280_DIG_P2_LSB_REG			0x90
#define BME280_DIG_P2_MSB_REG			0x91
#define BME280_DIG_P3_LSB_REG			0x92
#define BME280_DIG_P3_MSB_REG			0x93
#define BME280_DIG_P4_LSB_REG			0x94
#define BME280_DIG_P4_MSB_REG			0x95
#define BME280_DIG_P5_LSB_REG			0x96
#define BME280_DIG_P5_MSB_REG			0x97
#define BME280_DIG_P6_LSB_REG			0x98
#define BME280_DIG_P6_MSB_REG			0x99
#define BME280_DIG_P7_LSB_REG			0x9A
#define BME280_DIG_P7_MSB_REG			0x9B
#define BME280_DIG_P8_LSB_REG			0x9C
#define BME280_DIG_P8_MSB_REG			0x9D
#define BME280_DIG_P9_LSB_REG			0x9E
#define BME280_DIG_P9_MSB_REG			0x9F
#define BME280_DIG_H1_REG				0xA1
#define BME280_CHIP_ID_REG				0xD0 //Chip ID
#define BME280_RST_REG					0xE0 //Softreset Reg
#define BME280_DIG_H2_LSB_REG			0xE1
#define BME280_DIG_H2_MSB_REG			0xE2
#define BME280_DIG_H3_REG				0xE3
#define BME280_DIG_H4_MSB_REG			0xE4
#define BME280_DIG_H4_LSB_REG			0xE5
#define BME280_DIG_H5_MSB_REG			0xE6
#define BME280_DIG_H6_REG				0xE7
#define BME280_CTRL_HUMIDITY_REG		0xF2 //Ctrl Humidity Reg
#define BME280_STAT_REG					0xF3 //Status Reg
#define BME280_CTRL_MEAS_REG			0xF4 //Ctrl Measure Reg
#define BME280_CONFIG_REG				0xF5 //Configuration Reg
#define BME280_PRESSURE_MSB_REG			0xF7 //Pressure MSB
#define BME280_PRESSURE_LSB_REG			0xF8 //Pressure LSB
#define BME280_PRESSURE_XLSB_REG		0xF9 //Pressure XLSB
#define BME280_TEMPERATURE_MSB_REG		0xFA //Temperature MSB
#define BME280_TEMPERATURE_LSB_REG		0xFB //Temperature LSB
#define BME280_TEMPERATURE_XLSB_REG		0xFC //Temperature XLSB
#define BME280_HUMIDITY_MSB_REG			0xFD //Humidity MSB
#define BME280_HUMIDITY_LSB_REG			0xFE //Humidity LSB


//Class SensorSettings.  This object is used to hold settings data.  The application
//uses this classes' data directly.  The settings are adopted and sent to the sensor
//at special times, such as .begin.  Some are used for doing math.
//
//This is a kind of bloated way to do this.  The trade-off is that the user doesn't
//need to deal with #defines or enums with bizarre names.
//
//A power user would strip out SensorSettings entirely, and send specific read and
//write command directly to the IC. (ST #defines below)
//
struct SensorSettings
{
  public:
	
  //Main Interface and mode settings
    uint8_t commInterface;
    uint8_t I2CAddress;
    uint8_t chipSelectPin;
	
	uint8_t runMode;
	uint8_t tStandby;
	uint8_t filter;
	uint8_t tempOverSample;
	uint8_t pressOverSample;
	uint8_t humidOverSample;

};

//Used to hold the calibration constants.  These are used
//by the driver as measurements are being taking
struct SensorCalibration
{
  public:
	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;
	uint8_t dig_H6;
	
};

//This is the man operational class of the driver.

class BME280
{
  public:
    //settings
    SensorSettings settings;
	SensorCalibration calibration;
	int32_t t_fine;
	
	//Constructor generates default SensorSettings.
	//(over-ride after construction if desired)
    BME280( void );
    //~BME280() = default;
	
	//Call to apply SensorSettings.
	//This also gets the SensorCalibration constants
    uint8_t begin( void );

	//Software reset routine
	void reset( void );
	
    //Returns the values as floats.
    float readFloatPressure( void );
	float readFloatAltitudeMeters( void );
	float readFloatAltitudeFeet( void );
	
	float readFloatHumidity( void );

	//Temperature related methods
    float readTempC( void );
    float readTempF( void );

    //The following utilities read and write

	//ReadRegisterRegion takes a uint8 array address as input and reads
	//a chunk of memory into that array.
    void readRegisterRegion(uint8_t*, uint8_t, uint8_t );
	//readRegister reads one register
    uint8_t readRegister(uint8_t);
    //Reads two regs, LSByte then MSByte order, and concatenates them
	//Used for two-byte reads
	int16_t readRegisterInt16( uint8_t offset );
	//Writes a byte;
    void writeRegister(uint8_t, uint8_t);
    
};



#endif  // End of __BME280_H__ definition check
