basic display of oscilloscope values in SerialMonitor (no zoom or scroll yet)

OneWireIO.ino

@@ -10,7 +10,7 @@ const int BufferSize = 128;
 byte buffer1[BufferSize];
 byte buffer2[BufferSize];
 byte* backBuffer = buffer1;
-byte backBufferPos = 0;
+volatile byte backBufferPos = 0;
 byte samplesSkipped = SkipSamples;
 unsigned long backBufferStartTime = micros();
 
@@ -44,11 +44,12 @@ void setup()
     
     sei();//enable interrupts
     
-    Serial.begin(9600);
+    Serial.begin(200000);
 }
 
 void loop()
 {
+    while(backBufferPos < BufferSize / 2) ;
     cli();//disable interrupts
     byte* currentBuffer = backBuffer;
     unsigned long currentBufferStartTime = backBufferStartTime;
@@ -58,11 +59,7 @@ void loop()
     backBufferStartTime = micros();
     sei();//enable interrupts
     
-    debug.write("Starting buffer transmission");
-    
     oscilloscope.write(currentBuffer, currentBufferSize, currentBufferStartTime);
-    
-    debug.write("Buffer transmitted");
 }
 
 ISR(ADC_vect) {//when new ADC value ready

SerialMonitor/SerialMonitor/App.xaml.cs

@@ -28,7 +28,7 @@ namespace SerialMonitor
 
             Serial = new SerialPort();
             Serial.PortName = "COM4";
-            Serial.BaudRate = 9600;
+            Serial.BaudRate = 200000;
 
             Serial.DataReceived += new System.IO.Ports.SerialDataReceivedEventHandler(OnDataReceived);
 
@@ -85,14 +85,7 @@ namespace SerialMonitor
                     MainWindowContext.Get.WriteLine(text);
                     break;
                 case "oscilloscope":
-                    /*float visibleDuration = 10.0f;
+                    MainWindowContext.Get.AddSequence(message.SendTime, message.Data);
-                    float sampleDelay = 0.000936f;
-                    float startOffset = (float)message.SendTime / 1000000;
-                    for (int i = 1; i < message.Data.Length; ++i )
-                    {
-                        var line = new Line();
-                        canvas.Children.Add(line);
-                    }*/
                     break;
             }
         }

SerialMonitor/SerialMonitor/MainWindow.xaml

@@ -5,7 +5,7 @@
     <Grid>
         <TextBlock TextWrapping="Wrap" VerticalAlignment="Bottom" Height="150" Text="{Binding ConsoleText}" Style="{DynamicResource Console}" Grid.ColumnSpan="2"/>
         <ScrollViewer HorizontalScrollBarVisibility="Visible" Margin="0,0,0,155" Grid.ColumnSpan="2">
-            <Canvas Style="{DynamicResource Oscilloscope}"/>
+            <Canvas Name="Oscilloscope" Style="{DynamicResource Oscilloscope}"/>
         </ScrollViewer>
     </Grid>
 </Window>

SerialMonitor/SerialMonitor/MainWindow.xaml.cs

@@ -23,7 +23,7 @@ namespace SerialMonitor
         public MainWindow()
         {
             InitializeComponent();
-            var context = new MainWindowContext();
+            var context = new MainWindowContext(this);
             context.WriteLine("Connecting...");
             this.DataContext = context;
         }

SerialMonitor/SerialMonitor/MainWindowContext.cs

@@ -4,13 +4,19 @@ using System.ComponentModel;
 using System.Linq;
 using System.Text;
 using System.Threading.Tasks;
+using System.Windows;
+using System.Windows.Controls;
+using System.Windows.Shapes;
 
 namespace SerialMonitor
 {
     public class MainWindowContext : INotifyPropertyChanged
     {
-        public MainWindowContext()
+        private MainWindow Window;
+
+        public MainWindowContext(MainWindow window)
         {
+            Window = window;
             Get = this;
         }
 
@@ -27,6 +33,78 @@ namespace SerialMonitor
             OnPropertyChanged("ConsoleText");
         }
 
+        private class Sequence
+        {
+            public ulong StartTime { get; set; }
+            public byte[] Data { get; set; }
+
+            public class Comparer : IComparer<Sequence>
+            {
+                public int Compare(Sequence x, Sequence y)
+                {
+                    return x.StartTime.CompareTo(y.StartTime);
+                }
+            }
+        }
+        double ValueToHeight(byte value) { return (double)value + 10; }
+        private SortedSet<Sequence> Sequences = new SortedSet<Sequence>(new Sequence.Comparer());
+        public IEnumerable<Line> Oscilloscope
+        {
+            get
+            {
+                if(!Sequences.Any())
+                    yield break;
+
+                ulong startTime = Sequences.ElementAt(0).StartTime;
+                
+                foreach (var sequence in Sequences)
+                {
+                    foreach (var line in ConvertToLines(sequence, startTime))
+                        yield return line;
+                }
+            }
+        }
+
+        private IEnumerable<Line> ConvertToLines(Sequence sequence, ulong displayStartTime)
+        {
+            double sampleDelay = 0.000936; // in seconds
+            double scale = 10; // in pixels per second
+
+            double pos = (sequence.StartTime - displayStartTime) / 1000000.0 * scale;
+            if (pos > 1000)
+                yield break;
+            double prevHeight = ValueToHeight(sequence.Data[0]);
+            for (int idx = 1; idx < sequence.Data.Length; ++idx)
+            {
+                byte value = sequence.Data[idx];
+                var line = new Line();
+                line.Stroke = System.Windows.Media.Brushes.LightSteelBlue;
+                line.X1 = pos;
+                pos += sampleDelay * scale;
+                line.X2 = pos;
+                line.Y1 = prevHeight;
+                prevHeight = ValueToHeight(value);
+                line.Y2 = prevHeight;
+                line.HorizontalAlignment = HorizontalAlignment.Left;
+                line.VerticalAlignment = VerticalAlignment.Center;
+                line.StrokeThickness = 1;
+                yield return line;
+            }
+        }
+
+        public void AddSequence(ulong startTime, byte[] data)
+        {
+            var sequence = new Sequence { StartTime = startTime, Data = data };
+            Sequences.Add(sequence);
+            OnPropertyChanged("Oscilloscope");
+            var canvas = (Canvas)Window.FindName("Oscilloscope");
+            /*canvas.Children.Clear();
+            foreach (var line in Oscilloscope)
+                canvas.Children.Add(line);*/
+            foreach (var line in ConvertToLines(sequence, Sequences.ElementAt(0).StartTime))
+                canvas.Children.Add(line);
+        }
+
         public event PropertyChangedEventHandler PropertyChanged;
         protected void OnPropertyChanged(string name)
         {