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Refactor USB handling to improve connection management and error cleanup

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This commit is contained in:
just_stuff_tm
2026-03-02 01:24:33 -05:00
committed by just-stuff-tm
parent f462815775
commit 98f7c3b088
4 changed files with 81 additions and 16 deletions
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lib/services/usb_serial_frame_codec.dart
+33 -10
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@@ -27,6 +27,7 @@ class UsbSerialDecodedPacket {
class UsbSerialFrameDecoder {
final List<int> _rxBuffer = <int>[];
int _startIndex = 0;
List<UsbSerialDecodedPacket> ingest(Uint8List bytes) {
if (bytes.isEmpty) {
@@ -37,34 +38,56 @@ class UsbSerialFrameDecoder {
final packets = <UsbSerialDecodedPacket>[];
while (true) {
if (_rxBuffer.isEmpty) {
if (_startIndex >= _rxBuffer.length) {
_rxBuffer.clear();
_startIndex = 0;
return packets;
}
if (_rxBuffer.first != usbSerialRxFrameStart &&
_rxBuffer.first != usbSerialTxFrameStart) {
_rxBuffer.removeAt(0);
if (_rxBuffer[_startIndex] != usbSerialRxFrameStart &&
_rxBuffer[_startIndex] != usbSerialTxFrameStart) {
_startIndex++;
_compactBufferIfNeeded();
continue;
}
if (_rxBuffer.length < usbSerialHeaderLength) {
final availableLength = _rxBuffer.length - _startIndex;
if (availableLength < usbSerialHeaderLength) {
_compactBufferIfNeeded(force: true);
return packets;
}
final payloadLength = _rxBuffer[1] | (_rxBuffer[2] << 8);
final payloadLength =
_rxBuffer[_startIndex + 1] | (_rxBuffer[_startIndex + 2] << 8);
final packetLength = usbSerialHeaderLength + payloadLength;
if (_rxBuffer.length < packetLength) {
if (availableLength < packetLength) {
_compactBufferIfNeeded(force: true);
return packets;
}
final frameStart = _rxBuffer.first;
final frameStart = _rxBuffer[_startIndex];
final payload = Uint8List.fromList(
_rxBuffer.sublist(usbSerialHeaderLength, packetLength),
_rxBuffer.sublist(
_startIndex + usbSerialHeaderLength,
_startIndex + packetLength,
),
);
_rxBuffer.removeRange(0, packetLength);
_startIndex += packetLength;
_compactBufferIfNeeded();
packets.add(
UsbSerialDecodedPacket(frameStart: frameStart, payload: payload),
);
}
}
void _compactBufferIfNeeded({bool force = false}) {
if (_startIndex == 0) {
return;
}
if (!force && _startIndex < 1024 && _startIndex < (_rxBuffer.length ~/ 2)) {
return;
}
_rxBuffer.removeRange(0, _startIndex);
_startIndex = 0;
}
}