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();
    }
}