FengChendian
commented
1 year ago I am very sorry to reply so late. I've been busy with my PhD project. Maybe you have fixed the problem.
It looks like a stream asynchronous problem. I think that it's due to await is not passed nested.
But I never use stream like this. There is nothing I can do to help further. Sorry.
Hi, I'm very new to serial communication and Streams for that matter. However, as a little project I'm trying to listen to a serial feed from an arduino. connected via USB.
I've initially used your sample code and the data comes across fine.
I have then mutilated said code into what is shown below. I'm using flutter riverpod for state management. When I look into the source code I can see you are already using streams but my knowledge is lacking on how to access this data.
I don't get any errors but the app just hangs. Any help is much much appreciated.
` final arduinoProvider = StreamProvider((ref) async* {
final arduinoData = await fetchArduinoData();
yield arduinoData; });
Future fetchArduinoData() async {
final port = SerialPort("COM3", openNow: false, ByteSize: 8);
port.openWithSettings(BaudRate: 9600); port.writeBytesFromString('A'); String incomingData = ''; String completeData = '';
while (port.isOpened && completeData == '') { incomingData = ''; port.readOnListenFunction = (value) { if (utf8.decode(value) != '>' && utf8.decode(value) != '\n') { incomingData += utf8.decode(value); } if (utf8.decode(value) == '\n') { completeData = incomingData; } }; } return completeData; }`