text: #include "EasyTransferI2C.h"
  
  //Captures address and size of struct
  void EasyTransferI2C::begin(uint8_t * ptr, uint8_t length, TwoWire *theSerial){
  	address = ptr;
  	size = length;
  	_serial = theSerial;
  
  	//dynamic creation of rx parsing buffer in RAM
  	rx_buffer = (uint8_t*) malloc(size);
  }
  
  //Sends out struct in binary, with header, length info and checksum
  void EasyTransferI2C::sendData(uint8_t i2c_address){
    uint8_t CS = size;
    _serial->beginTransmission(i2c_address);
    _serial->write(0x06);
    _serial->write(0x85);
    _serial->write(size);
    for(int i = 0; i<size; i++){
      CS^=*(address+i);
      _serial->write(*(address+i));
    }
    _serial->write(CS);
    _serial->endTransmission();
  }
  
  //Sends out struct in binary, with header, length info and checksum
  void EasyTransferI2C::answer(){
    uint8_t CS = size;
    // _serial->beginTransmission(i2c_address);
    _serial->write(0x06);
    _serial->write(0x85);
    _serial->write(size);
    for(int i = 0; i<size; i++){
      CS^=*(address+i);
      _serial->write(*(address+i));
    }
    _serial->write(CS);
  }
  
  boolean EasyTransferI2C::receiveData(){
  
  	//start off by looking for the header bytes. If they were already found in a previous call, skip it.
  	if(rx_len == 0){
  		//this size check may be redundant due to the size check below, but for now I'll leave it the way it is.
  		if(_serial->available() >= 3)
  		{
  			//this will block until a 0x06 is found or buffer size becomes less then 3.
  			while(_serial->read() != 0x06)
  			{
  				//This will trash any preamble junk in the serial buffer
  				//but we need to make sure there is enough in the buffer to process while we trash the rest
  				//if the buffer becomes too empty, we will escape and try again on the next call
  				if(_serial->available() < 3)
  					return false;
  			}
  			if (_serial->read() == 0x85)
  			{
  				rx_len = _serial->read();
  				//make sure the binary structs on both Arduinos are the same size.
  				if(rx_len != size)
  				{
  					rx_len = 0;
  					return false;
  				}
  			}
  		}
  	}
  
    //we get here if we already found the header bytes, the struct size matched what we know, and now we are byte aligned.
    if(rx_len != 0)
  	{
  		while(_serial->available() && rx_array_inx <= rx_len)
  		{
  			rx_buffer[rx_array_inx++] = _serial->read();
  		}
  
  		if(rx_len == (rx_array_inx-1))
  		{
  			//seem to have got whole message
  			//last uint8_t is CS
  			calc_CS = rx_len;
  			for (int i = 0; i<rx_len; i++){
  				calc_CS^=rx_buffer[i];
  			}
  
  			if(calc_CS == rx_buffer[rx_array_inx-1])
  			{//CS good
  				memcpy(address,rx_buffer,size);
  				rx_len = 0;
  				rx_array_inx = 0;
  				return true;
  			}
  
  			else
  			{
  				//failed checksum, need to clear this out anyway
  				rx_len = 0;
  				rx_array_inx = 0;
  				return false;
  			}
  
  		}
  	}
  	return false;
  }
  