serial_port_win32 #

A SerialPort library using win32 API.

Getting Started #

Get Ports #

final ports = SerialPort.getAvailablePorts();
print(ports);
/// result like [COM3, COM4]

Get Ports with more messages (Experiment) #

final List<PortInfo> ports = SerialPort.getPortsWithFullMessages();
print(ports); 
/// print [Port Name: COM3, FriendlyName: 蓝牙链接上的标准串行 (COM3), hardwareID: BTHENUM\{00001101-0000-1000-8000-00803f9b55fb}_LOCALMFG&0000, manufactureName: Microsoft]

PortInfo({
required this.portName,
required this.friendlyName,
required this.hardwareID,
required this.manufactureName,
});

Create Serial Port #

The port instance is Singleton Pattern. Don't re-create port for same Com name.

final port = SerialPort("COM5", openNow: false, ByteSize: 8, ReadIntervalTimeout: 1, ReadTotalTimeoutConstant: 2);
// port.open()
port.openWithSettings(BaudRate: CBR_115200);
// final port = SerialPort("COM5"); /// auto open with default settings

Set parameters #

port.BaudRate = CBR_115200;
port.ByteSize = 8;
port.StopBits = ONESTOPBIT;
port.Parity = NOPARITY;
port.ReadIntervalTimeout = 10;
/// and so on, parameters like win32.

Read #

port.readBytesSize = 8;
port.readOnListenFunction = (value) {
print(value);
};
// or
// can only choose one function
print(await port.readBytesUntil(Uint8List.fromList("\n".codeUnits)));

Write #

Write String

String buffer = "hello";
port.writeBytesFromString(buffer);

Write Uint8List

final uint8_data = Uint8List.fromList([1, 2, 3, 4, 5, 6]);
print(port.writeBytesFromUint8List(uint8_data));

Get Port Connection Status #

port.isOpened == false;

Flow Control #

port.setFlowControlSignal(SerialPort.SETDTR);
port.setFlowControlSignal(SerialPort.CLRDTR);

Close Serial Port #

Close Without Listen

port.close();

Close On Listen

port.closeOnListen(
  onListen: () => print(port.isOpened),
)
  ..onError((err) {
    print(err);
  })
  ..onDone(() {
    print("is closed");
    print(port.isOpened);
  });

Attention #

If you want to read or write strings using serial, be careful to handle the terminator at the end.

Although in most cases, like "Hello\0" (68 65 6C 6C 6F 00) and "Hello"(68 65 6C 6C 6F) both can be identified by computer.

Small Example #

import 'package:serial_port_win32/src/serial_port.dart';

void main() {
    var ports = SerialPort.getAvailablePorts();
    print(ports);
    if(ports.isNotEmpty){
      var port = SerialPort(ports[0]);
      port.BaudRate = CBR_115200;
      port.StopBits = ONESTOPBIT;
      port.close();
    }
}