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Enhance USB port opening and reading logic with improved error handling and debug logging

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zjs81 2026-03-07 12:55:15 -07:00
parent fef73b7b62
commit 421bc71bb7
1 changed files with 33 additions and 4 deletions
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37
lib/services/usb_serial_service_web.dart
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@ -268,9 +268,23 @@ class UsbSerialService {
return null;
}
Future<void> _openPort(JSObject port, int baudRate) {
final options = JSObject()..['baudRate'] = baudRate.toJS;
return port.callMethod<JSPromise<JSAny?>>('open'.toJS, options).toDart;
Future<void> _openPort(JSObject port, int baudRate) async {
final options = JSObject()
..['baudRate'] = baudRate.toJS
..['flowControl'] = 'none'.toJS;
await port.callMethod<JSPromise<JSAny?>>('open'.toJS, options).toDart;
// Prevent ESP32 USB-CDC reset: hold DTR=true, RTS=false after open.
try {
final signals = JSObject()
..['dataTerminalReady'] = true.toJS
..['requestToSend'] = false.toJS;
await port
.callMethod<JSPromise<JSAny?>>('setSignals'.toJS, signals)
.toDart;
} catch (_) {
// setSignals may not be supported on all browsers/devices.
}
}
Future<void> _cleanupFailedConnect() async {
@ -324,8 +338,12 @@ class UsbSerialService {
Future<void> _pumpReads() async {
final reader = _reader;
if (reader == null) return;
if (reader == null) {
_debugLogService?.warn('_pumpReads: reader is null', tag: 'USB Serial');
return;
}
_debugLogService?.info('_pumpReads: started', tag: 'USB Serial');
try {
while (_status == UsbSerialStatus.connected &&
identical(reader, _reader)) {
@ -333,6 +351,7 @@ class UsbSerialService {
.callMethod<JSPromise<JSAny?>>('read'.toJS)
.toDart;
if (result == null) {
_debugLogService?.warn('_pumpReads: null result', tag: 'USB Serial');
break;
}
final resultObject = result as JSObject;
@ -340,20 +359,30 @@ class UsbSerialService {
final doneValue = resultObject.getProperty<JSAny?>('done'.toJS);
final done = doneValue != null && doneValue.dartify() == true;
if (done) {
_debugLogService?.info('_pumpReads: done=true', tag: 'USB Serial');
break;
}
final value = resultObject.getProperty<JSAny?>('value'.toJS);
final bytes = _coerceBytes(value);
if (bytes != null && bytes.isNotEmpty) {
_debugLogService?.info(
'USB RX raw: ${bytes.length} byte(s)',
tag: 'USB Serial',
);
_ingestRawBytes(bytes);
}
}
} catch (error, stackTrace) {
_debugLogService?.error(
'_pumpReads error: $error',
tag: 'USB Serial',
);
if (_status == UsbSerialStatus.connected) {
_addFrameError(error, stackTrace);
}
} finally {
_debugLogService?.info('_pumpReads: ended', tag: 'USB Serial');
_releaseLock(reader);
if (_status == UsbSerialStatus.connected && identical(reader, _reader)) {
_addFrameError(StateError('USB serial connection closed'));