void writeEeprom(byte dataAddr, byte data){
  i2cmux(3);
  int rData = data;
  HWire.beginTransmission(eeprom_addr);
  HWire.write((int)(dataAddr >> 8));
  HWire.write((int)(dataAddr & 0xFF));
  HWire.write(rData);
  HWire.endTransmission();
  delay(5);
}

byte readEeprom(byte dataAddr){
  i2cmux(3);
  byte rData=0xFF;
  HWire.beginTransmission(eeprom_addr);
  HWire.write((int)(dataAddr >> 8));
  HWire.write((int)(dataAddr & 0xFF));
  HWire.endTransmission();
  delay(5);
  HWire.requestFrom(eeprom_addr, 1);
  if(HWire.available()){
    rData = HWire.read();
  }
  //delay(10);

  return rData;
}