From ac4f8c9bb36ae6ef8b077678ee5ea6c631b53c6e Mon Sep 17 00:00:00 2001
From: mort5161 <mnielsen@esri.com>
Date: Fri, 20 Mar 2015 12:46:55 -0700
Subject: [PATCH] Added device tab for opening up other devices and example of
 auto discovery of serial port devices

---
 src/SampleApp.WinDesktop/MainWindow.xaml    |  35 +++++
 src/SampleApp.WinDesktop/MainWindow.xaml.cs | 155 +++++++++++++++++++-
 2 files changed, 183 insertions(+), 7 deletions(-)

diff --git a/src/SampleApp.WinDesktop/MainWindow.xaml b/src/SampleApp.WinDesktop/MainWindow.xaml
index c4a1144..a69cacf 100644
--- a/src/SampleApp.WinDesktop/MainWindow.xaml
+++ b/src/SampleApp.WinDesktop/MainWindow.xaml
@@ -49,6 +49,41 @@
 				 HorizontalScrollBarVisibility="Visible"
 				 />
 			</TabItem>
+			<TabItem Header="Device">
+				<Grid>
+					<StackPanel Margin="10">
+						<StackPanel Orientation="Horizontal">
+							<TextBlock Text="Current device: " />
+							<TextBlock Text="None" x:Name="currentDeviceInfo" FontWeight="Bold" />
+						</StackPanel>
+						<Button Width="200" Content="Open NMEA Log..." Click="OpenNmeaLogButton_Click" HorizontalAlignment="Left" Padding="20,5" Margin="0,5" />
+						<StackPanel Orientation="Horizontal">
+							<Button Width="200" Content="Auto-discover serial port"
+									HorizontalAlignment="Left" Padding="20,5" Margin="0,5" 
+									Click="AutoDiscoverButton_Click" />
+							<TextBlock x:Name="autoDiscoverStatus" VerticalAlignment="Center" />
+						</StackPanel>
+						<GroupBox Header="Open Serial device" Width="200" HorizontalAlignment="Left">
+							<StackPanel>
+								<TextBlock Text="Serial port:" />
+								<ComboBox x:Name="serialPorts" />
+								<TextBlock Text="Baud rate:" />
+								<ComboBox x:Name="baudRates" SelectedIndex="3">
+									<ComboBoxItem>1200</ComboBoxItem>
+									<ComboBoxItem>2400</ComboBoxItem>
+									<ComboBoxItem>4800</ComboBoxItem>
+									<ComboBoxItem>9600</ComboBoxItem>
+									<ComboBoxItem>19200</ComboBoxItem>
+									<ComboBoxItem>38400</ComboBoxItem>
+									<ComboBoxItem>57600</ComboBoxItem>
+									<ComboBoxItem>115200</ComboBoxItem>
+								</ComboBox>
+								<Button Content="Connect" HorizontalAlignment="Left" Padding="20,5" Margin="0,5" Click="ConnectToSerialButton_Click" />
+							</StackPanel>
+						</GroupBox>
+					</StackPanel>
+				</Grid>
+			</TabItem>
 		</TabControl>
 		
 		<Grid.ColumnDefinitions>
diff --git a/src/SampleApp.WinDesktop/MainWindow.xaml.cs b/src/SampleApp.WinDesktop/MainWindow.xaml.cs
index f2979b8..603be88 100644
--- a/src/SampleApp.WinDesktop/MainWindow.xaml.cs
+++ b/src/SampleApp.WinDesktop/MainWindow.xaml.cs
@@ -21,20 +21,64 @@ namespace SampleApp.WinDesktop
 	public partial class MainWindow : Window
 	{
 		private Queue<string> messages = new Queue<string>(101);
-		
+		private NmeaParser.NmeaDevice currentDevice;
+		//Dialog for browsing to nmea log files
+		private Microsoft.Win32.OpenFileDialog nmeaOpenFileDialog = new Microsoft.Win32.OpenFileDialog()
+		{
+			Filter = "Text files|*.txt|NMEA Log|*.nmea|All files|*.*",
+			InitialDirectory = new System.IO.FileInfo(typeof(MainWindow).Assembly.Location).DirectoryName
+		};
 		public MainWindow()
 		{
 			InitializeComponent();
 
-			// Use serial port:
-			//var comPort = System.IO.Ports.SerialPort.GetPortNames().First();
-			//var port = new System.IO.Ports.SerialPort(comPort, 4800);
-			//var device = new NmeaParser.SerialPortDevice(port);
+			//Get list of serial ports for device tab
+			var availableSerialPorts = System.IO.Ports.SerialPort.GetPortNames().OrderBy(s=>s);
+			serialPorts.ItemsSource = availableSerialPorts;
+			serialPorts.SelectedIndex = 0;
+			// Use serial portName:
+			//var comPort = availableSerialPorts.First();
+			//var portName = new System.IO.Ports.SerialPort(comPort, 4800);
+			//var device = new NmeaParser.SerialPortDevice(portName);
 
 			//Use a log file for playing back logged data
 			var device = new NmeaParser.NmeaFileDevice("NmeaSampleData.txt");
-			device.MessageReceived += device_MessageReceived;
-			var _ = device.OpenAsync();
+
+			StartDevice(device);
+		}
+
+		/// <summary>
+		/// Unloads the current device, and opens the next device
+		/// </summary>
+		/// <param name="device"></param>
+		private void StartDevice(NmeaParser.NmeaDevice device)
+		{
+			//Clean up old device
+			if (currentDevice != null)
+			{
+				currentDevice.MessageReceived -= device_MessageReceived;
+				currentDevice.Dispose();
+			}
+			output.Text = "";
+			messages.Clear();
+			gprmcView.Message = null;
+			gpggaView.Message = null;
+			gpgsaView.Message = null;
+			gpgllView.Message = null;
+			pgrmeView.Message = null;
+			satView.GpgsvMessages = null;
+			//Start new device
+			currentDevice = device;
+			currentDevice.MessageReceived += device_MessageReceived;
+			var _ = currentDevice.OpenAsync();
+			if (device is NmeaParser.NmeaFileDevice)
+				currentDeviceInfo.Text = string.Format("NmeaFileDevice( file={0} )", ((NmeaParser.NmeaFileDevice)device).Filename);
+			else if (device is NmeaParser.SerialPortDevice)
+			{
+				currentDeviceInfo.Text = string.Format("SerialPortDevice( port={0}, baud={1} )",
+					((NmeaParser.SerialPortDevice)device).Port.PortName,
+					((NmeaParser.SerialPortDevice)device).Port.BaudRate);
+			}
 		}
 		
 		private void device_MessageReceived(object sender, NmeaParser.NmeaMessageReceivedEventArgs args)
@@ -64,5 +108,102 @@ namespace SampleApp.WinDesktop
 					pgrmeView.Message = args.Message as NmeaParser.Nmea.Gps.Garmin.Pgrme;
 			});
 		}
+
+		//Browse to nmea file and create device from selected file
+		private void OpenNmeaLogButton_Click(object sender, RoutedEventArgs e)
+		{
+			var result = nmeaOpenFileDialog.ShowDialog();
+			if (result.HasValue && result.Value)
+			{
+				var file = nmeaOpenFileDialog.FileName;
+				var device = new NmeaParser.NmeaFileDevice(file);
+				StartDevice(device);
+			}
+		}
+
+		//Creates a serial port device from the selected settings
+		private void ConnectToSerialButton_Click(object sender, RoutedEventArgs e)
+		{
+			var portName = serialPorts.Text as string;
+			var baudRate = int.Parse(baudRates.Text);
+			var device = new NmeaParser.SerialPortDevice(new System.IO.Ports.SerialPort(portName, baudRate));
+			StartDevice(device);
+		}
+
+		//Attempts to perform an auto discovery of serial ports
+		private async void AutoDiscoverButton_Click(object sender, RoutedEventArgs e)
+		{
+			var button = sender as Button;
+			button.IsEnabled = false;
+			System.IO.Ports.SerialPort port = await Task.Run<System.IO.Ports.SerialPort>(() => {
+				return FindPort(
+					new System.Progress<string>((s) => { Dispatcher.BeginInvoke((Action)delegate() { autoDiscoverStatus.Text = s; }); }));
+			});
+			if (port != null) //we found a port
+			{
+				autoDiscoverStatus.Text = "";
+				serialPorts.Text = port.PortName;
+				baudRates.Text = port.BaudRate.ToString();
+				ConnectToSerialButton_Click(sender, e);
+			}
+			else
+				autoDiscoverStatus.Text = "No GPS port found";
+			button.IsEnabled = false;
+		}
+
+		//Iterates all serial ports and attempts to open them at different baud rates
+		//and looks for a GPS message.
+		private static System.IO.Ports.SerialPort FindPort(IProgress<string> progress = null)
+		{
+			var ports = System.IO.Ports.SerialPort.GetPortNames().OrderBy(s => s);
+			foreach (var portName in ports)
+			{
+				using (var port = new System.IO.Ports.SerialPort(portName))
+				{
+					var defaultRate = port.BaudRate;
+					List<int> baudRatesToTest = new List<int>(new[] { 9600, 4800, 115200, 19200, 57600, 38400, 2400 }); //Ordered by likelihood
+					//Move default rate to first spot
+					if (baudRatesToTest.Contains(defaultRate)) baudRatesToTest.Remove(defaultRate);
+					baudRatesToTest.Insert(0, defaultRate);
+					foreach (var baud in baudRatesToTest)
+					{
+
+						if (progress != null)
+							progress.Report(string.Format("Trying {0} @ {1}baud", portName, port.BaudRate));
+						port.BaudRate = baud;
+						port.ReadTimeout = 2000; //this might not be long enough
+						bool success = false;
+						try
+						{
+							port.Open();
+							if (!port.IsOpen)
+								continue; //couldn't open port
+							try
+							{
+								port.ReadTo("$GP");
+							}
+							catch (TimeoutException)
+							{
+								continue;
+							}
+						}
+						catch
+						{
+							//Error reading
+						}
+						finally
+						{
+							port.Close();
+						}
+						if (success)
+						{
+							port.Dispose();
+							return new System.IO.Ports.SerialPort(portName, baud);
+						}
+					}
+				}
+			}
+			return null;
+		}
 	}
 }