serial_port_win32 2.1.0 serial_port_win32: ^2.1.0 copied to clipboard
A SerialPort library using win32 API, for connecting real device by serial port. Only supports Windows.
import 'dart:typed_data';
import 'package:flutter/material.dart';
import 'package:serial_port_win32/serial_port_win32.dart';
void main() {
runApp(MyApp());
}
class MyApp extends StatelessWidget {
// This widget is the root of your application.
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
theme: ThemeData(
primarySwatch: Colors.blue,
),
home: MyHomePage(title: 'Flutter Demo Home Page'),
);
}
}
class MyHomePage extends StatefulWidget {
MyHomePage({Key? key, required this.title}) : super(key: key);
final String title;
@override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
var ports = <String>[];
late SerialPort port;
final sendData = Uint8List.fromList(List.filled(4, 1, growable: false));
String data = '';
void _getPortsAndOpen() {
final List<PortInfo> portInfoLists = SerialPort.getPortsWithFullMessages();
ports = SerialPort.getAvailablePorts();
print(portInfoLists);
print(ports);
if (ports.isNotEmpty) {
port = SerialPort("COM8", openNow: false);
port.open();
}
setState(() {});
}
void _send() async {
if (!port.isOpened) {
port.open();
}
print('β¬---------------------------- general read (read <= 18 bytes)');
await port.writeBytesFromString("πζAT",
includeZeroTerminator: false,
stringConverter: StringConverter.nativeUtf8);
var read = port.readBytes(18, timeout: Duration(milliseconds: 10))
..then((onValue) => print(onValue));
await Future.delayed(Duration(milliseconds: 5));
await port.writeBytesFromString("πζAT",
includeZeroTerminator: false,
stringConverter: StringConverter.nativeUtf8);
Uint8List readUint8List = await read;
print('await result: $readUint8List');
print(
'β¬---------------------------- time out read,try to read **18 bytes** data in queue (read <= 18 bytes)');
await port.writeBytesFromString("πAT",
includeZeroTerminator: false,
stringConverter: StringConverter.nativeUtf8);
var timeOutRead = port.readBytes(18, timeout: Duration(milliseconds: 10))
..then((onValue) => print(onValue));
await port.writeBytesFromString("πζAT",
includeZeroTerminator: false,
stringConverter: StringConverter.nativeUtf8);
await timeOutRead;
print(
'β¬---------------------------- read successful without timeout, but you just want 8 bytes (read <= 8 bytes)');
await port.writeBytesFromString("πAT",
includeZeroTerminator: false,
stringConverter: StringConverter.nativeUtf8);
var wantedBytesRead = port.readBytes(8, timeout: Duration(milliseconds: 10))
..then((onValue) => print(onValue));
await port.writeBytesFromString("πζAT",
includeZeroTerminator: false,
stringConverter: StringConverter.nativeUtf8);
await wantedBytesRead;
print(
'β¬---------------------------- read until specified fixed size (2 bytes), it may cause deadlock (read == 2 bytes)');
await port.writeBytesFromString("πAT",
includeZeroTerminator: false,
stringConverter: StringConverter.nativeUtf8);
var fixedBytesRead = port.readFixedSizeBytes(2)
..then((onValue) => print(onValue));
await port.writeBytesFromString("πζAT",
includeZeroTerminator: false,
stringConverter: StringConverter.nativeUtf8);
await fixedBytesRead;
// port.close();
}
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
// Here we take the value from the MyHomePage object that was created by
// the App.build method, and use it to set our appbar title.
title: Text(widget.title),
),
body: Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Text(
'You have pushed the button this many times:',
),
Text(
ports.toString(),
style: Theme.of(context).textTheme.headlineMedium,
),
Text(data),
ElevatedButton(
onPressed: () {
port.close();
},
child: Text("close"),
),
ElevatedButton(
onPressed: () {
_send();
},
child: Text("write"),
),
],
),
),
floatingActionButton: FloatingActionButton(
onPressed: _getPortsAndOpen,
tooltip: 'GetPorts',
child: Icon(Icons.search),
), // This trailing comma makes auto-formatting nicer for build methods.
);
}
}