71 lines
2.6 KiB
C#
71 lines
2.6 KiB
C#
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using System;
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using System.IO;
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using System.Threading.Tasks;
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using Windows.Devices.Enumeration;
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using Windows.Devices.SerialCommunication;
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namespace Plane.Communication
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{
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/// <summary>
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/// 提供串口通信的能力。
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/// </summary>
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public class SerialPortConnection : StreamConnection
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{
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private uint _baudRate;
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private SerialDevice _device;
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private string _deviceId;
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public SerialPortConnection(string deviceId, uint baudRate = 115200)
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{
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_deviceId = deviceId;
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_baudRate = baudRate;
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}
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public override void Close()
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{
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base.Close();
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_device?.Dispose();
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}
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public override async Task OpenAsync()
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{
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_device = await SerialDevice.FromIdAsync(_deviceId);
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if (_device != null)
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{
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_device.BaudRate = _baudRate;
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_device.DataBits = 8;
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_device.StopBits = SerialStopBitCount.One;
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_device.Parity = SerialParity.None;
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_device.IsDataTerminalReadyEnabled = true;
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_device.IsRequestToSendEnabled = true;
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_device.ReadTimeout = TimeSpan.FromMilliseconds(1200);
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_inputStream = _device.InputStream;
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_outputStream = _device.OutputStream.AsStreamForWrite();
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IsOpen = true;
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}
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else
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{
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var deviceAccessStatus = DeviceAccessInformation.CreateFromId(_deviceId).CurrentStatus;
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string message;
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if (deviceAccessStatus == DeviceAccessStatus.DeniedByUser)
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{
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message = "Access to the device was blocked by the user : " + _deviceId;
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}
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else if (deviceAccessStatus == DeviceAccessStatus.DeniedBySystem)
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{
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// This status is most likely caused by app permissions (did not declare the device in the app's package.appxmanifest)
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// This status does not cover the case where the device is already opened by another app.
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message = "Access to the device was blocked by the system : " + _deviceId;
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}
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else
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{
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// Most likely the device is opened by another app, but cannot be sure
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message = "Unknown error, possibly opened by another app : " + _deviceId;
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}
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throw new DeviceAccessDeniedException(message, deviceAccessStatus);
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}
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}
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}
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}
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