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MainPage.xaml.cs
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MainPage.xaml.cs
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using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
using System.Linq;
using System.Runtime.InteropServices.WindowsRuntime;
using System.Text;
using System.Threading.Tasks;
using Windows.Devices.Enumeration;
using Windows.Devices.SerialCommunication;
using Windows.Foundation;
using Windows.Foundation.Collections;
using Windows.Storage.Streams;
using Windows.UI.Core;
using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls;
using Windows.UI.Xaml.Controls.Primitives;
using Windows.UI.Xaml.Data;
using Windows.UI.Xaml.Input;
using Windows.UI.Xaml.Media;
using Windows.UI.Xaml.Navigation;
// The Blank Page item template is documented at https://go.microsoft.com/fwlink/?LinkId=402352&clcid=0x409
namespace PiSerialCrashTest
{
/// <summary>
/// An empty page that can be used on its own or navigated to within a Frame.
/// </summary>
public sealed partial class MainPage : Page
{
//-----Declare page's class level variables
private bool EnableFeed = false;
private bool FeedActive = false;
DeviceInformationCollection DeviceList;
SerialDevice Port;
DataWriter PortDataWriter;
CoreDispatcherPriority DispatchPriority = CoreDispatcherPriority.Normal;
//-----Execute at page load-----
public MainPage()
{
this.InitializeComponent();
for (int i = 0; i<=99; i++)
{ FilePreview.Items.Add((string)"Text to send line " + i.ToString()); }
FilePreview.SelectedIndex = 0;
FilePreview.ScrollIntoView(FilePreview.SelectedItem);
}
//-----Open com port when page is navigated to
async protected override void OnNavigatedTo(NavigationEventArgs e)
{
DeviceList = await DeviceInformation.FindAllAsync(SerialDevice.GetDeviceSelector());
if (!DeviceList[0].Id.ToString().Contains("ACPI"))
{ Port = await SerialDevice.FromIdAsync(DeviceList[0].Id); }
else
{ Port = await SerialDevice.FromIdAsync(DeviceList[1].Id); }
Port.BaudRate = 9600;
Port.DataBits = 8;
Port.Parity = SerialParity.None;
Port.StopBits = SerialStopBitCount.One;
Port.Handshake = SerialHandshake.RequestToSend; //<-----Handshaking Enabled!
Port.ReadTimeout = TimeSpan.FromMilliseconds(1000);
Port.WriteTimeout = TimeSpan.FromMilliseconds(1000);
PortDataWriter = new DataWriter(Port.OutputStream);
Port.ErrorReceived += PortError;
base.OnNavigatedTo(e);
}
//-----Close Com Port when page is navigated away from
protected override void OnNavigatingFrom(NavigatingCancelEventArgs e)
{
//await PortDataWriter.FlushAsync();
PortDataWriter.DetachStream();
PortDataWriter = null;
Port.Dispose();
base.OnNavigatingFrom(e);
}
//-----Handle Single Line Feed Button-----
private void SingleBtn_Click(object sender, RoutedEventArgs e)
{
if (!FeedActive)
{
EnableFeed = false;
Task t1 = new Task(async () => { await FeedTask(); });
t1.Start();
t1.Wait();
}
}
//-----Handle Continuous Feed Button-----
private void FeedBtn_Click(object sender, RoutedEventArgs e)
{
if (!EnableFeed)
{
if (!FeedActive)
{
FilePreview.IsEnabled = false;
SingleBtn.IsEnabled = false;
FeedBtn.Icon = new SymbolIcon(Symbol.Pause);
EnableFeed = true;
Task t1 = new Task(async () => { await FeedTask(); }, TaskCreationOptions.LongRunning);
t1.Start();
}
}
else
{
FilePreview.IsEnabled = true;
SingleBtn.IsEnabled = true;
FeedBtn.Icon = new SymbolIcon(Symbol.Play);
EnableFeed = false;
}
}
//-----Task for Feeding Lines to Serial Port
private async Task FeedTask()
{
FeedActive = true;
string s = "";
int i = 0;
int c = 0;
await this.Dispatcher.RunAsync(DispatchPriority, () =>
{
i = FilePreview.SelectedIndex;
c = FilePreview.Items.Count;
});
while (i < c)
{
//*****Update Controls in the UI thread*****
await this.Dispatcher.RunAsync(DispatchPriority, () =>
{
s = FilePreview.SelectedItem.ToString();
});
//This commented code was used to bypass the Datawriter for testing
/*s = s += "\r\n";
StringBuilder sb = new StringBuilder();
sb.Insert(0, s);
Windows.Storage.Streams.IBuffer b;
byte[] ba1 = Encoding.UTF8.GetBytes(s);
b = ba1.AsBuffer();
uint x = await Port.OutputStream.WriteAsync(b);*/
s = s += "\r\n";
PortDataWriter.WriteString(s);
Task<UInt32> storeAsyncTask;
storeAsyncTask = PortDataWriter.StoreAsync().AsTask(); //<----This is where program hangs
uint x = await storeAsyncTask ;
if (x != 0)
{
i++;
if (i < c)
{
//*****Update Controls in the UI thread*****
await this.Dispatcher.RunAsync(DispatchPriority, () =>
{
FilePreview.SelectedIndex = i;
FilePreview.ScrollIntoView(FilePreview.SelectedItem);
});
}
else
{
//*****Update Controls in the UI thread*****
await this.Dispatcher.RunAsync(DispatchPriority, () =>
{
FilePreview.SelectedIndex = 0;
FilePreview.ScrollIntoView(FilePreview.SelectedItem);
});
EnableFeed = false;
}
}
if (EnableFeed == false) { break; }
}
//*****Update Controls in the UI thread*****
await this.Dispatcher.RunAsync(DispatchPriority, () =>
{
SingleBtn.IsEnabled = true;
FeedBtn.Icon = new SymbolIcon(Symbol.Play);
});
FeedActive = false;
}
private void PortError(SerialDevice serialdevice, ErrorReceivedEventArgs e)
{
System.Diagnostics.Debug.WriteLine("which pin changed:" + e.Error.ToString());
}
}
}