code: func (l *littleWire) i2cWrite(sendBuffer []byte, length int, endWithStop uint8) error {
  	C.i2c_write(l.lwHandle, (*C.uchar)(&sendBuffer[0]), C.uchar(length), C.uchar(endWithStop))
  	return l.error()
  }
docs: // i2cWrite sends byte(s) over i2c with a given length <= 4