Adafruit_SGP30.h

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#ifndef ADAFRUIT_SGP30_H
#define ADAFRUIT_SGP30_H

#include "Arduino.h"
#include <Adafruit_BusIO_Register.h>
#include <Adafruit_I2CDevice.h>

// the i2c address
#define SGP30_I2CADDR_DEFAULT 0x58 

// commands and constants
#define SGP30_FEATURESET 0x0020    
#define SGP30_CRC8_POLYNOMIAL 0x31 
#define SGP30_CRC8_INIT 0xFF       
#define SGP30_WORD_LEN 2           


class Adafruit_SGP30 {
public:
  Adafruit_SGP30();
  boolean begin(TwoWire *theWire = &Wire, boolean initSensor = true);
  boolean softReset();
  boolean IAQinit();
  boolean IAQmeasure();
  boolean IAQmeasureRaw();

  boolean getIAQBaseline(uint16_t *eco2_base, uint16_t *tvoc_base);
  boolean setIAQBaseline(uint16_t eco2_base, uint16_t tvoc_base);
  boolean setHumidity(uint32_t absolute_humidity);

  uint16_t TVOC;

  uint16_t eCO2;

  uint16_t rawH2;

  uint16_t rawEthanol;

  uint16_t serialnumber[3];

private:
  Adafruit_I2CDevice *i2c_dev = NULL; 
  void write(uint8_t address, uint8_t *data, uint8_t n);
  void read(uint8_t address, uint8_t *data, uint8_t n);
  bool readWordFromCommand(uint8_t command[], uint8_t commandLength,
                           uint16_t delay, uint16_t *readdata = NULL,
                           uint8_t readlen = 0);
  uint8_t generateCRC(uint8_t data[], uint8_t datalen);
};
#endif // ndef ADAFRUIT_SGP30_H