sireader.py 文件源码

def _send_command(self, command, parameters):
        try:
            if self._serial.inWaiting() != 0:
                raise SIReaderException(
                    'Input buffer must be empty before sending command. Currently %s bytes in the input buffer.' % self._serial.inWaiting())
            command_string = command + int2byte(len(parameters)) + parameters
            crc = SIReader._crc(command_string)
            cmd = SIReader.STX + command_string + crc + SIReader.ETX
            if self._debug:
                print("==>> command '%s', parameters %s, crc %s" % (hexlify(command).decode('ascii'),
                                                                    ' '.join(
                                                                        [hexlify(int2byte(c)).decode('ascii') for c in
                                                                         parameters]),
                                                                    hexlify(crc).decode('ascii'),
                                                                    ))
            self._serial.write(cmd)
        except (SerialException, OSError) as  msg:
            raise SIReaderException('Could not send command: %s' % msg)

        if self._logfile:
            self._logfile.write('s %s %s\n' % (datetime.now(), cmd))
            self._logfile.flush()
            os.fsync(self._logfile)
        return self._read_command()