Question

我正在Raspberry Pi 3上使用Windows IoT Core制作应用程序。

我正在尝试使用串行通信与Arduino进行通信。我在GitHub上使用了本例中显示的大多数方法来创建串行设备并写入它：https://github.com/ms-iot/samples/tree/develop/SerialSample/CS。

程序在前130个字节左右运行正常，但之后会开始大幅减速并在第135个字节左右崩溃。

有时它会导致Raspberry Pi显示Windows 10“死亡蓝屏”，说它需要重启。

我尝试过多次重写代码并使用异步，任务和等待的不同变体，但似乎无法使其工作。

这是我用来初始化串行设备的代码：

private async void setup()
{
    serialPort = await initializeSerial();
}

private async Task<SerialDevice> initializeSerial()
{
    try
    {
        string aqs = SerialDevice.GetDeviceSelector();
        var dis = await DeviceInformation.FindAllAsync(aqs);

        for (int i = 0; i < dis.Count; i++)
        {
            if (dis[i].Name.Contains("Arduino Uno"))
            {
                var serialPort = await SerialDevice.FromIdAsync(dis[i].Id);

                /* Configure serial settings */
                serialPort.WriteTimeout = TimeSpan.FromMilliseconds(1000);
                serialPort.ReadTimeout = TimeSpan.FromMilliseconds(1000);
                serialPort.BaudRate = 9600;
                serialPort.Parity = SerialParity.None;
                serialPort.StopBits = SerialStopBitCount.One;
                serialPort.DataBits = 8;
                serialPort.Handshake = SerialHandshake.None;

                // Display configured settings
                //Debug.WriteLine("Serial port configured successfully.");

                // Create cancellation token object to close I/O operations when closing the device
                ReadCancellationTokenSource = new CancellationTokenSource();


                return serialPort;
            }
        }
    }
    catch (Exception ex)
    {
        Debug.WriteLine(ex.Message);
    }

    return null;
}

这是我用来写入串行设备的代码：

private async void sendString(string stringToSend)
{
    try
    {
        if (serialPort != null)
        {
            // Create the DataWriter object and attach to OutputStream
            dataWriteObject = new DataWriter(serialPort.OutputStream);

            //Launch the WriteAsync task to perform the write
            await WriteAsync(stringToSend);
        }
        else
        {
            status.Text = "Select a device and connect";
        }
    }
    catch (Exception ex)
    {
        status.Text = "sendString: " + ex.Message;
    }
    finally
    {
            // Cleanup once complete
            if (dataWriteObject != null)
            {
                dataWriteObject.DetachStream();
                dataWriteObject = null;
            }
    }
}

/// <summary>
/// WriteAsync: Task that asynchronously writes data from the input text box 'sendText' to the OutputStream 
/// </summary>
/// <returns></returns>
private async Task WriteAsync(string stringToWrite)
{
    Task<UInt32> storeAsyncTask;

    dataWriteObject.WriteString(stringToWrite);                

    // Launch an async task to complete the write operation
    storeAsyncTask = dataWriteObject.StoreAsync().AsTask();

    UInt32 bytesWritten = await storeAsyncTask;
    if (bytesWritten > 0)
    {
        counter++;
        status.Text = stringToWrite + ", ";
        status.Text += "bytes written successfully! (" + counter + ")";
    }       
}

任何帮助/建议都将不胜感激。

更新

我重写了我的sendString方法，并使用using语句对其进行了简化：

private async void sendString(string stringToSend)
{
    using (DataWriter dataWriter = new DataWriter(serialPort.OutputStream))
    {
        dataWriter.WriteString(stringToSend);
        await dataWriter.StoreAsync();
        //await dataWriter.FlushAsync();
        dataWriter.DetachStream();

        counter++;
        status.Text = stringToSend + ", ";
        status.Text += "bytes written successfully! (" + counter + ")";
    }
}

然而，问题仍然存在。

Answer 1

我尝试使用UART引脚代替USB线来写入数据，并且没有遇到任何问题。这是我用来在Pi上初始化UART总线的代码，我使用了与上面使用相同的函数来编写：

private async Task<SerialDevice> initializeSerial()
{
    try
    {
        string aqs = SerialDevice.GetDeviceSelector("UART0");
        var dis = await DeviceInformation.FindAllAsync(aqs);

        SerialDevice serialPort = await SerialDevice.FromIdAsync(dis[0].Id);

        /* Configure serial settings */
        serialPort.WriteTimeout = TimeSpan.FromMilliseconds(1000);
        serialPort.ReadTimeout = TimeSpan.FromMilliseconds(1000);
        serialPort.BaudRate = 9600;
        serialPort.Parity = SerialParity.None;
        serialPort.StopBits = SerialStopBitCount.One;
        serialPort.DataBits = 8;
        serialPort.Handshake = SerialHandshake.None;

        status.Text = "Serial port configured succesfully.";

        return serialPort;
    }
    catch (Exception ex)
    {
        Debug.WriteLine(ex.Message);
    }

    status.Text = "Serial port not configured successfully. Are you sure a serial device is connected?";
    return null;
}

这并不能完全解决通过USB线发送数据的问题，但是我在这里发布，以防任何人在使用USB端口时遇到类似问题而想尝试这样做。

UWP应用程序速度变慢，然后在一定数量的串行写入后崩溃

更新

1 个答案: