Flutter:flutter_libserialport: ^0.4.0 最大写入字节数为 60？

Question

我需要通过串口写入120字节的数据，但是我发现使用flutter_libserialport库的写接口只能成功写入60字节。有什么办法可以解决这个问题吗？ 以下是我的代码

debugPrint(
        "Send command: ${request.map((e) => e.toRadixString(16).padLeft(2, '0').toUpperCase()).join(' ')}");
debugPrint("length: ${_portManager.write(request)}");


class SerialPortManager {
  final String portName;
  late SerialPort _serialPort;
  final LogManager logManager; // 添加 LogManager 成员

  SerialPortManager(this.portName, this.logManager) {
    _serialPort = SerialPort(portName);
    _serialPort.config = SerialPortConfig()
      ..baudRate = 115200
      ..setFlowControl(SerialPortFlowControl.none);
  }

  bool open() {
    if (!_serialPort.openReadWrite()) {
      try {
        _serialPort.open(mode: SerialPortMode.readWrite);
        return true;
      } catch (e) {
        debugPrint("Error opening port $portName: $e");
        logManager.addLog("Error opening port $portName: $e");
        return false;
      }
    }
    return true;
  }

  void close() {
    if (_serialPort.isOpen) {
      _serialPort.close();
    }
  }

  int write(Uint8List data) {
    try {
      if (!_serialPort.isOpen) {
        if (!open()) {
          return -1;
        }
      }
      return _serialPort.write(data);
    } catch (e) {
      debugPrint("Error writing to port $portName: $e");
      logManager.addLog("Error writing to port $portName: $e");
      return -1;
    }
  }

  Stream<Uint8List>? listen() {
    try {
      return SerialPortReader(_serialPort).stream;
    } catch (e) {
      debugPrint("Error setting up listener for port $portName: $e");
      logManager.addLog("Error setting up listener for port $portName: $e");
      return null;
    }
  }
}

打印的是：

颤动：发送命令：4C 4B 00 7C 2F 40 02 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 03 12 颤动：长度：60

我想在Flutter中使用串口写入60多个字节

Answer 1

int write(Uint8List data) {
    try {
      if (!_serialPort.isOpen) {
        if (!open()) {
          return -1;
        }
      }

      return _serialPort.write(data,timeout: 500);

    } catch (e) {
      debugPrint("Error writing to port $portName: $e");
      logManager.addLog("Error writing to port $portName: $e");
      return -1;
    }
  }

/// Write data to the serial port.
  ///
  /// If `timeout` is 0 or greater, the write operation is blocking.
  /// The timeout is specified in milliseconds. Pass 0 to wait infinitely.
  ///
  /// Returns the amount of bytes written.
  int write(Uint8List bytes, {int timeout = -1});

所以我可以将超时更改为0或>0，现在效果很好~