Windows UWP Windows.Devices.SerialCommunication.SerialDevice 不工作 [英] Windows UWP Windows.Devices.SerialCommunication.SerialDevice Not working

问题描述

是我一个人的问题，还是bug?

Is it just me, or is this a bug?

serialPort = await SerialDevice.FromIdAsync(Id);

serialPort 始终为 null，即使 Id 不是.

serialPort is always null, even while Id is not.

我需要让这个工作.现在我只是在编写非常快速而肮脏"的代码来测试来自 Windows 10 通用应用程序的串行通信.我在 x86 和 x64 中都调试了相同的结果.

I need to have this working. For now I am just writing very "quick and dirty" code to test serial communication from a Windows 10 Universal app. I debugged in both x86 and x64 with same result.

这是我目前所处的位置，但如果不创建 serialPort，我就无法走多远......

Here is where I am at for now, but I can't go very far without a serialPort being created....

public class SerialComm
    {
        private SerialDevice serialPort;
        DataWriter dataWriteObject = null;
        DataReader dataReaderObject = null;

        public async void StartTest()
        {

            var deviceSelector = SerialDevice.GetDeviceSelector("COM3");
            var myDevices = await Windows.Devices.Enumeration.DeviceInformation.FindAllAsync(deviceSelector);
            var myCurrentDevice = myDevices[0];
            string Id = myCurrentDevice.Id.ToString();

            try
            {
                serialPort = await SerialDevice.FromIdAsync(Id);
            }
            catch (Exception)
            {

                throw;
            }

            StringBuilder commandBuilder = new StringBuilder();

            while (true)
            {
                var rBuffer = (new byte[1]).AsBuffer();
                await serialPort.InputStream.ReadAsync(rBuffer, 1, InputStreamOptions.Partial);

                if ((char)rBuffer.ToArray()[0] != '\n')
                {
                    commandBuilder.Append((char)rBuffer.ToArray()[0]);
                }
                else
                {
                    string temp = "";

                    try
                    {
                        temp += rBuffer.ToString();
                    }
                    catch (Exception)
                    {
                        temp = "Error";
                    }

                    commandBuilder.Append(temp);
                }

                string stringToDisplay = commandBuilder.ToString();
            }

感谢您的帮助和建议....

Thanks for your help and advices....

推荐答案

我在 Maxbotix 传感器上遇到了同样的问题，该传感器使用 FTDI 芯片进行 USB 到串行通信.我可以在终端程序中很好地连接到设备，我可以从真正的 .NET Framework 的 SerialPort 类中使用它，但在来自 GitHub 的 UWP SerialSample 和我的代码 SerialDevice 中都可以使用它.FromIdAsync() 返回 null.

I had the same problem with a Maxbotix sensor that was using an FTDI chip for the USB-to-serial communication. I could connect to the device fine in a terminal program, and I could use it from the real .NET Framework's SerialPort class, but in both the UWP SerialSample from GitHub and my code, SerialDevice.FromIdAsync() returned null.

对我来说，解决方案分为两部分.

For me, the solution was in two parts.

第一部分是在 Package.appxmanifest 文件中添加设备功能:

The first part was to add the device capability in the Package.appxmanifest file:

<DeviceCapability Name="serialcommunication">
  <Device Id="any">
    <Function Type="name:serialPort" />
  </Device>
</DeviceCapability>

第二部分是从 FTDI 网站.一旦我这样做了，它就开始工作了.

The second part was to download an updated driver (I used version 2.12.06) from the FTDI Web site. As soon as I did this, it started working.

完整示例如下:

            var aqsFilter = SerialDevice.GetDeviceSelector("COM3");
            var devices = await DeviceInformation.FindAllAsync(aqsFilter);
            if (devices.Any())
            {
                var deviceId = devices.First().Id;
                this.device = await SerialDevice.FromIdAsync(deviceId);

                if (this.device != null)
                {
                    this.device.BaudRate = 57600;
                    this.device.StopBits = SerialStopBitCount.One;
                    this.device.DataBits = 8;
                    this.device.Parity = SerialParity.None;
                    this.device.Handshake = SerialHandshake.None;

                    this.reader = new DataReader(this.device.InputStream);
                }
            }

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