37d2af70b7
- 新增 AutoSerialConnect 服务：启动后自动连接第一个 USB 串口设备， 固定 115200/8/N/1，连接失败时每 3s 重试，断开后重新进入重试循环 - main.dart 通过 ProviderContainer 在 runApp 之前触发 autoSerialConnectProvider - 移除设置页「串口配置」菜单项及对应面板分支 - StatusBar 在「设备运行状态」前增加串口连接状态指示（已连接/连接中/未连接）
110 lines
2.9 KiB
Dart
110 lines
2.9 KiB
Dart
import 'dart:async';
|
||
|
||
import 'package:usb_serial/usb_serial.dart';
|
||
|
||
import '../models/serial_config.dart';
|
||
import 'device_log.dart';
|
||
import 'serial_port_service.dart';
|
||
|
||
/// 启动自动连接服务
|
||
///
|
||
/// App 启动时调用 [start]，自动连接第一个可用的 USB 串口设备：
|
||
/// - 固定 115200 波特率 / 8 数据位 / 1 停止位 / 默认其它
|
||
/// - 连接失败时每 3 秒重试一次
|
||
/// - 连接成功后停止重试；连接断开后重新进入重试循环
|
||
class AutoSerialConnect {
|
||
/// 重试间隔
|
||
static const Duration retryInterval = Duration(seconds: 3);
|
||
|
||
/// 自动连接使用的固定参数
|
||
static const SerialConfig autoConfig = SerialConfig(
|
||
baudRate: 115200,
|
||
dataBits: 8,
|
||
stopBits: 1,
|
||
);
|
||
|
||
final SerialPortService _service;
|
||
Timer? _retryTimer;
|
||
StreamSubscription<SerialConnectionState>? _stateSub;
|
||
bool _disposed = false;
|
||
|
||
AutoSerialConnect(this._service);
|
||
|
||
/// 启动自动连接：立即尝试一次，失败则按 [retryInterval] 周期重试
|
||
void start() {
|
||
if (_stateSub != null) return;
|
||
_stateSub = _service.connectionStateChanges.listen(_onStateChange);
|
||
unawaited(_tryConnect());
|
||
}
|
||
|
||
void _onStateChange(SerialConnectionState s) {
|
||
if (_disposed) return;
|
||
switch (s) {
|
||
case SerialConnectionState.connected:
|
||
// 连接成功：停止重试
|
||
_cancelRetry();
|
||
case SerialConnectionState.disconnected:
|
||
case SerialConnectionState.error:
|
||
// 设备断开或出错：进入重试
|
||
_scheduleRetry();
|
||
case SerialConnectionState.connecting:
|
||
// 正在连接中，忽略
|
||
break;
|
||
}
|
||
}
|
||
|
||
Future<void> _tryConnect() async {
|
||
if (_disposed) return;
|
||
if (_service.isConnected ||
|
||
_service.state == SerialConnectionState.connecting) {
|
||
return;
|
||
}
|
||
|
||
final List<UsbDevice> devices;
|
||
try {
|
||
devices = await _service.listDevices();
|
||
} catch (e) {
|
||
DeviceLog.warn('列出 USB 设备失败: $e，${retryInterval.inSeconds}s 后重试');
|
||
_scheduleRetry();
|
||
return;
|
||
}
|
||
|
||
if (devices.isEmpty) {
|
||
DeviceLog.info('未检测到 USB 串口设备，${retryInterval.inSeconds}s 后重试');
|
||
_scheduleRetry();
|
||
return;
|
||
}
|
||
|
||
final device = devices.first;
|
||
final ok = await _service.connect(device, autoConfig);
|
||
if (!ok) {
|
||
DeviceLog.warn('串口自动连接失败: '
|
||
'${_service.lastError ?? "未知错误"}，${retryInterval.inSeconds}s 后重试');
|
||
_scheduleRetry();
|
||
}
|
||
}
|
||
|
||
void _scheduleRetry() {
|
||
if (_disposed) return;
|
||
if (_retryTimer != null) return;
|
||
_retryTimer = Timer(retryInterval, () {
|
||
_retryTimer = null;
|
||
unawaited(_tryConnect());
|
||
});
|
||
}
|
||
|
||
void _cancelRetry() {
|
||
_retryTimer?.cancel();
|
||
_retryTimer = null;
|
||
}
|
||
|
||
/// 释放资源
|
||
Future<void> dispose() async {
|
||
if (_disposed) return;
|
||
_disposed = true;
|
||
_cancelRetry();
|
||
await _stateSub?.cancel();
|
||
_stateSub = null;
|
||
}
|
||
}
|