readWord2C method
Implementation
int readWord2C(int registerAddress) {
var value = i2c.readByteReg(i2cAddress, registerAddress) & 0xff;
value = value << 8;
value += i2c.readByteReg(i2cAddress, (registerAddress + 1)) & 0xff;
if (value >= 0x8000) value = -(65536 - value);
return value;
}