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// **********************************************************************************
// Driver definition for HopeRF TH02 temperature and humidity sensor
// **********************************************************************************
// Creative Commons Attrib Share-Alike License
// You are free to use/extend this library but please abide with the CC-BY-SA license:
// http://creativecommons.org/licenses/by-sa/4.0/
//
// For any explanation see TH02 sensor information at
// http://www.hoperf.com/sensor/app/TH02.htm
//
// Code based on following datasheet
// http://www.hoperf.com/upload/sensor/TH02_V1.1.pdf 
//
// Written by Charles-Henri Hallard (http://hallard.me)
//ported to mbed env by Philippe LAURENT (IUT de NICE France)
//
// History : V1.00 2014-07-14 - First release
//           V1.10 2015-04-13 - changed to Wire library instead of I2C
//
// All text above must be included in any redistribution.
//
// **********************************************************************************
#ifndef TH02_H
#define TH02_H

#include <mbed.h>            //

// TH02 I2C Device address
#define TH02_I2C_ADDR 0x40

// TH02 Registers addresses
#define TH02_STATUS 0
#define TH02_DATAh  1
#define TH02_DATAl  2
#define TH02_CONFIG 3
#define TH02_ID     17

// TH02 custom error code return function
#define TH02_I2C_ERR 0xFF

// Unititialized values (arbitrary)
#define TH02_UNINITIALIZED_TEMP 55555 // int32_t internal value 
#define TH02_UNINITIALIZED_RH   1111  // int32_t internal value
#define TH02_UNDEFINED_VALUE    12345 // int16_t returned value

// we decide error if conversion is >= 50ms 
#define TH02_CONVERSION_TIME_OUT  50

// Bit definition of TH02 registers values
#define TH02_STATUS_RDY    0x01

#define TH02_CONFIG_START  0x01
#define TH02_CONFIG_HEAT   0x02
#define TH02_CONFIG_TEMP   0x10
#define TH02_CONFIG_HUMI   0x00
#define TH02_CONFIG_FAST   0x20

// THO2 Linearization Coefficients
#define TH02_A0   -4.7844
#define TH02_A1    0.4008
#define TH02_A2   -0.00393

// TH02 Temperature compensation Linearization Coefficients
#define TH02_Q0   0.1973
#define TH02_Q1   0.00237





class TH02 { 
  public:
            TH02(uint8_t address);
    uint8_t getId(uint8_t * pvalue);
    uint8_t getId(void);
    uint8_t getStatus(uint8_t * pvalue);
    bool isConverting(void);
    uint8_t waitEndConversion(void);
    uint8_t getConfig(uint8_t * pvalue);
    uint8_t setConfig(uint8_t config);
    uint8_t startTempConv(bool fastmode = false, bool heater = false);
    uint8_t startRHConv(bool fastmode = false, bool heater = false);
    int16_t roundInt(float value);
    int16_t getConversionValue(void);
    int16_t getConpensatedRH(bool round);
    int32_t getLastRawRH(void);
    int32_t getLastRawTemp(void);

/**
  * TH02 constructor
  *
  * @param sda  I2C data pin
  * @param scl  I2C clock pin
  * @param address I2C slave sensor address

  */
  TH02(PinName sda, PinName scl, uint8_t address);

  /**
  * MFRC522 destructor
  */
  ~TH02();



  private:
I2C             m_I2C;
    uint8_t writeCommand(uint8_t command, bool release=true);
    uint8_t writeRegister(uint8_t reg, uint8_t value);
    uint8_t readRegister(uint8_t reg, uint8_t * value);

    int32_t _last_temp; // Last measured temperature (for linearization)
    int32_t _last_rh;   // Last measured RH
    uint8_t _address;   // I2C Module Address



};

  

#endif