Cleanup

Source/Meadow.Foundation.Core/Communications/SpiCommunications.cs

@@ -12,7 +12,7 @@ public class SpiCommunications : ISpiCommunications
         /// <summary>
         /// The SPI chip select port
         /// </summary>
-        public IDigitalOutputPort? ChipSelect { get; }
+        public IDigitalOutputPort ChipSelect { get; }
 
         /// <summary>
         /// The chip select mode (active high or active low)

Source/Meadow.Foundation.Libraries_and_Frameworks/DataLoggers.AdafruitIO/Driver/AdafruitIO.cs

@@ -57,7 +57,7 @@ public class AdafruitIO
         /// <param name="userName">Adafruit username</param>
         /// <param name="iokey">Write key</param>
         /// <param name="group">group</param>
-        public AdafruitIO(string userName, string iokey, string group = null)
+        public AdafruitIO(string userName, string iokey, string group = "")
         {
             Group = group;
             UserName = userName;

Source/Meadow.Foundation.Libraries_and_Frameworks/Displays.TextDisplayMenu/Driver/BaseClasses/TimeBase.cs

@@ -19,7 +19,7 @@ public abstract class TimeBase : InputBase
         /// Raised if the input value changes
         /// </summary>
 
-        public override event ValueChangedHandler ValueChanged;
+        public override event ValueChangedHandler ValueChanged = delegate { };
 
         /// <summary>
         /// Create a new TimeBase object

Source/Meadow.Foundation.Libraries_and_Frameworks/Graphics.MicroGraphics/Driver/Buffers/PixelBufferBase.cs

@@ -71,7 +71,10 @@ public int BitDepth
         /// <summary>
         /// Create a new PixelBufferBase object
         /// </summary>
-        public PixelBufferBase() { }
+        public PixelBufferBase()
+        {
+            Buffer = new byte[0];
+        }
 
         /// <summary>
         /// Create a new PixelBufferBase object
@@ -82,6 +85,7 @@ public PixelBufferBase(int width, int height)
         {
             Width = width;
             Height = height;
+            Buffer = new byte[0];
             InitializeBuffer();
         }
 
@@ -355,7 +359,7 @@ protected virtual void Dispose(bool disposing)
                 {
                     if (disposing)
                     {
-                        Buffer = null;
+                        Buffer = new byte[0];
                     }
                 }
             }

Source/Meadow.Foundation.Libraries_and_Frameworks/Graphics.MicroGraphics/Driver/Image.cs

@@ -18,12 +18,12 @@ public partial class Image
         /// <summary>
         /// The image width in pixels
         /// </summary>
-        public int Width => DisplayBuffer.Width;
+        public int Width => DisplayBuffer?.Width ?? 0;
 
         /// <summary>
         /// The image height in pixels
         /// </summary>
-        public int Height => DisplayBuffer.Height;
+        public int Height => DisplayBuffer?.Height ?? 0;
 
         /// <summary>
         /// The image bits per pixel

Source/Meadow.Foundation.Libraries_and_Frameworks/Graphics.MicroGraphics/Driver/MicroGraphics.cs

@@ -156,13 +156,13 @@ public MicroGraphics(IGraphicsDisplay display)
         /// </summary>
         /// <param name="pixelBuffer">The pixel buffer</param>
         /// <param name="initializeBuffer">Initialize the off-screen buffer if true</param>
-        public MicroGraphics(PixelBufferBase pixelBuffer, bool initializeBuffer)
+        public MicroGraphics(IPixelBuffer pixelBuffer, bool initializeBuffer)
         {
             memoryBuffer = pixelBuffer;
 
-            if (initializeBuffer)
+            if (initializeBuffer && pixelBuffer is PixelBufferBase buf)
             {
-                pixelBuffer.InitializeBuffer();
+                buf.InitializeBuffer();
             }
         }
 

Source/Meadow.Foundation.Libraries_and_Frameworks/Graphics.MicroLayout/Samples/Ili9488Charts_Sample/MeadowApp.cs

@@ -24,9 +24,10 @@ public override Task Initialize()
             colorMode: ColorMode.Format16bppRgb565
         );
 
-        screen = new DisplayScreen(display, Meadow.Foundation.Graphics.RotationType._270Degrees);
-
-        screen.BackgroundColor = Color.Black;
+        screen = new DisplayScreen(display, RotationType._270Degrees)
+        {
+            BackgroundColor = Color.Black
+        };
 
         return base.Initialize();
     }
@@ -42,8 +43,8 @@ public void Text()
     {
         var label = new Label(0, 0, screen.Width, screen.Height);
         label.Font = new Font12x20();
-        label.HorizontalAlignment = Meadow.Foundation.Graphics.HorizontalAlignment.Center;
-        label.VerticalAlignment = Meadow.Foundation.Graphics.VerticalAlignment.Center;
+        label.HorizontalAlignment = HorizontalAlignment.Center;
+        label.VerticalAlignment = VerticalAlignment.Center;
         label.TextColor = Color.Red;
         label.Text = "HELLO";
 

Source/Meadow.Foundation.Libraries_and_Frameworks/Graphics.MicroLayout/Samples/MAX7219_Sample/MeadowApp.cs

@@ -7,19 +7,19 @@
 
 public class MeadowApp : App<Windows>
 {
-    private readonly Ft232h _expander = new Ft232h();
-    private DisplayScreen _screen;
+    private readonly Ft232h expander = new Ft232h();
+    private DisplayScreen screen;
 
     public override Task Initialize()
     {
         var display = new Max7219(
-            _expander.CreateSpiBus(),
-            _expander.Pins.C0.CreateDigitalOutputPort(), // CS
+            expander.CreateSpiBus(),
+            expander.Pins.C0.CreateDigitalOutputPort(), // CS
             deviceRows: 4,
             deviceColumns: 1);
 
-        _screen = new DisplayScreen(display, Meadow.Foundation.Graphics.RotationType._270Degrees);
-        _screen.BackgroundColor = Color.Black;
+        screen = new DisplayScreen(display, Meadow.Foundation.Graphics.RotationType._270Degrees);
+        screen.BackgroundColor = Color.Black;
 
         return base.Initialize();
     }
@@ -33,27 +33,27 @@ public override Task Run()
 
     public void Text()
     {
-        var label = new Label(0, 0, _screen.Width, _screen.Height);
+        var label = new Label(0, 0, screen.Width, screen.Height);
         label.HorizontalAlignment = Meadow.Foundation.Graphics.HorizontalAlignment.Center;
         label.VerticalAlignment = Meadow.Foundation.Graphics.VerticalAlignment.Center;
         label.TextColor = Color.White;
         label.Text = "HELLO";
 
-        _screen.Controls.Add(label);
+        screen.Controls.Add(label);
 
     }
 
     public void TextOnBox()
     {
-        var box = new Box(0, 0, _screen.Width / 4, _screen.Height);
+        var box = new Box(0, 0, screen.Width / 4, screen.Height);
         box.ForeColor = Color.Red;
-        var label = new Label(0, 0, _screen.Width / 4, _screen.Height);
+        var label = new Label(0, 0, screen.Width / 4, screen.Height);
         label.HorizontalAlignment = Meadow.Foundation.Graphics.HorizontalAlignment.Center;
         label.VerticalAlignment = Meadow.Foundation.Graphics.VerticalAlignment.Center;
         label.TextColor = Color.Black;
         label.Text = "Meadow";
 
-        _screen.Controls.Add(box, label);
+        screen.Controls.Add(box, label);
 
         while (true)
         {
@@ -66,10 +66,10 @@ public void TextOnBox()
 
     public void Sweep()
     {
-        var box = new Box(0, 0, _screen.Width / 4, _screen.Height);
+        var box = new Box(0, 0, screen.Width / 4, screen.Height);
         box.ForeColor = Color.Red;
 
-        _screen.Controls.Add(box);
+        screen.Controls.Add(box);
 
         var direction = 1;
         var speed = 1;
@@ -80,7 +80,7 @@ public void Sweep()
 
             box.Left = left;
 
-            if ((box.Right >= _screen.Width) || box.Left <= 0)
+            if ((box.Right >= screen.Width) || box.Left <= 0)
             {
                 direction *= -1;
             }

Source/Meadow.Foundation.Peripherals/Displays.Ch1115/Driver/Ch1115.cs

@@ -88,9 +88,9 @@ public SpiClockConfiguration.Mode SpiBusMode
         /// <param name="resetPin">Reset pin</param>
         /// <param name="width">Width of display in pixels</param>
         /// <param name="height">Height of display in pixels</param>
-        public Ch1115(ISpiBus spiBus, IPin chipSelectPin, IPin dcPin, IPin resetPin,
+        public Ch1115(ISpiBus spiBus, IPin? chipSelectPin, IPin dcPin, IPin resetPin,
             int width = 128, int height = 64) :
-            this(spiBus, chipSelectPin?.CreateDigitalOutputPort(), dcPin.CreateDigitalOutputPort(),
+            this(spiBus, chipSelectPin?.CreateDigitalOutputPort() ?? null, dcPin.CreateDigitalOutputPort(),
                 resetPin.CreateDigitalOutputPort(), width, height)
         {
         }
@@ -105,7 +105,7 @@ public Ch1115(ISpiBus spiBus, IPin chipSelectPin, IPin dcPin, IPin resetPin,
         /// <param name="width">Width of display in pixels</param>
         /// <param name="height">Height of display in pixels</param>
         public Ch1115(ISpiBus spiBus,
-            IDigitalOutputPort chipSelectPort,
+            IDigitalOutputPort? chipSelectPort,
             IDigitalOutputPort dataCommandPort,
             IDigitalOutputPort resetPort,
             int width = 128, int height = 64)

Source/Meadow.Foundation.Peripherals/Displays.Gtk/Driver/Gtk.cs

@@ -33,6 +33,8 @@ public class GtkDisplay : IGraphicsDisplay, ITouchScreen
     private bool _leftButtonState = false;
 
     private EventWaitHandle ShowComplete { get; } = new EventWaitHandle(true, EventResetMode.ManualReset);
+
+    /// <inheritdoc/>
     public IPixelBuffer PixelBuffer => _pixelBuffer;
 
     /// <summary>
@@ -60,14 +62,20 @@ static GtkDisplay()
     }
 
     /// <summary>
-    /// Create a new WinFormsDisplay with a default size of 800x600
+    /// Create a new GTK Display with a default size of 800x600
     /// </summary>
     /// <param name="mode">Color mode of the display</param>
     public GtkDisplay(ColorMode mode = ColorMode.Format24bppRgb888)
     {
         Initialize(800, 600, mode); // TODO: query screen size and caps
     }
 
+    /// <summary>
+    /// Create a new GTK Display
+    /// </summary>
+    /// <param name="width">Width of display in pixels</param>
+    /// <param name="height">Height of display in pixels</param>
+    /// <param name="mode">Color mode of the display</param>
     public GtkDisplay(int width, int height, ColorMode mode = ColorMode.Format24bppRgb888)
     {
         Initialize(width, height, mode);
@@ -76,7 +84,7 @@ public GtkDisplay(int width, int height, ColorMode mode = ColorMode.Format24bppR
     private void Initialize(int width, int height, ColorMode mode)
     {
         _window = new Window(WindowType.Popup);
-        _window.WidgetEvent += _window_WidgetEvent;
+        _window.WidgetEvent += WindowWidgetEvent;
 
         switch (mode)
         {
@@ -121,7 +129,7 @@ private void RaiseTouchUp(double x, double y)
 
     }
 
-    private void _window_WidgetEvent(object o, WidgetEventArgs args)
+    private void WindowWidgetEvent(object o, WidgetEventArgs args)
     {
         if (args.Event is Gdk.EventButton b)
         {
@@ -142,6 +150,9 @@ private void _window_WidgetEvent(object o, WidgetEventArgs args)
         }
     }
 
+    /// <summary>
+    /// Run the application
+    /// </summary>
     public void Run()
     {
         Application.Run();
@@ -276,7 +287,7 @@ public void WriteBuffer(int x, int y, IPixelBuffer displayBuffer)
     private int GetStrideForBitDepth(int width, int bpp)
     {
         var cairo_stride_alignment = sizeof(UInt32);
-        var stride = ((((bpp) * (width) + 7) / 8 + cairo_stride_alignment - 1) & -cairo_stride_alignment);
+        var stride = ((bpp * width + 7) / 8 + cairo_stride_alignment - 1) & -cairo_stride_alignment;
         return stride;
     }
 

Source/Meadow.Foundation.Peripherals/Displays.Led.FourDigitSevenSegment/Driver/FourDigitSevenSegment.cs

@@ -9,7 +9,7 @@ namespace Meadow.Foundation.Displays.Led
     /// </summary>
     public class FourDigitSevenSegment
     {
-        CancellationTokenSource cts = null;
+        CancellationTokenSource? cts = null;
 
         readonly IDigitalOutputPort[] digits;
         readonly SevenSegment[] sevenSegments;
@@ -111,7 +111,7 @@ public void SetDisplay(string characters, int decimalLocation = -1)
         /// <param name="decimalLocation">The decimal position (0 indexed)</param>
         public void SetDisplay(char[] characters, int decimalLocation = -1)
         {
-            if (!cts.Token.IsCancellationRequested)
+            if (cts != null && !cts.Token.IsCancellationRequested)
             {
                 cts.Cancel();
             }

Source/Meadow.Foundation.Peripherals/Displays.Pcd8544/Driver/Pcd8544.cs

@@ -94,8 +94,8 @@ public SpiClockConfiguration.Mode SpiBusMode
         /// <param name="chipSelectPin">Chip select pin</param>
         /// <param name="dcPin">Data command pin</param>
         /// <param name="resetPin">Reset pin</param>
-        public Pcd8544(ISpiBus spiBus, IPin chipSelectPin, IPin dcPin, IPin resetPin) :
-            this(spiBus, chipSelectPin?.CreateDigitalOutputPort(), dcPin.CreateDigitalOutputPort(true),
+        public Pcd8544(ISpiBus spiBus, IPin? chipSelectPin, IPin dcPin, IPin resetPin) :
+            this(spiBus, chipSelectPin?.CreateDigitalOutputPort() ?? null, dcPin.CreateDigitalOutputPort(true),
                 resetPin.CreateDigitalOutputPort(true))
         {
         }
@@ -108,7 +108,7 @@ public Pcd8544(ISpiBus spiBus, IPin chipSelectPin, IPin dcPin, IPin resetPin) :
         /// <param name="dataCommandPort">Data command output port</param>
         /// <param name="resetPort">Reset output port</param>
         public Pcd8544(ISpiBus spiBus,
-            IDigitalOutputPort chipSelectPort,
+            IDigitalOutputPort? chipSelectPort,
             IDigitalOutputPort dataCommandPort,
             IDigitalOutputPort resetPort)
         {

Source/Meadow.Foundation.Peripherals/Displays.Sh110x/Driver/Sh110x.cs

@@ -135,8 +135,8 @@ public Sh110x(II2cBus i2cBus, byte address, int width, int height)
         /// <param name="resetPin">Reset pin</param>
         /// <param name="width">Display width in pixels</param>
         /// <param name="height">Display height in pixels</param>
-        public Sh110x(ISpiBus spiBus, IPin chipSelectPin, IPin dcPin, IPin resetPin, int width, int height) :
-            this(spiBus, chipSelectPin?.CreateDigitalOutputPort(), dcPin.CreateDigitalOutputPort(),
+        public Sh110x(ISpiBus spiBus, IPin? chipSelectPin, IPin dcPin, IPin resetPin, int width, int height) :
+            this(spiBus, chipSelectPin?.CreateDigitalOutputPort() ?? null, dcPin.CreateDigitalOutputPort(),
                 resetPin.CreateDigitalOutputPort(), width, height)
         {
         }
@@ -151,7 +151,7 @@ public Sh110x(ISpiBus spiBus, IPin chipSelectPin, IPin dcPin, IPin resetPin, int
         /// <param name="width">Display width in pixels</param>
         /// <param name="height">Display height in pixels</param>
         public Sh110x(ISpiBus spiBus,
-            IDigitalOutputPort chipSelectPort,
+            IDigitalOutputPort? chipSelectPort,
             IDigitalOutputPort dataCommandPort,
             IDigitalOutputPort resetPort,
             int width, int height)

Source/Meadow.Foundation.Peripherals/Displays.Ssd1327/Driver/Ssd1327.cs

@@ -40,7 +40,7 @@ public partial class Ssd1327 : IGraphicsDisplay, ISpiPeripheral
         /// <summary>
         /// The default SPI bus speed for the device
         /// </summary>
-        public Frequency DefaultSpiBusSpeed => new Frequency(10000, Frequency.UnitType.Kilohertz);
+        public Frequency DefaultSpiBusSpeed => new(10000, Frequency.UnitType.Kilohertz);
 
         /// <summary>
         /// The SPI bus speed for the device
@@ -71,7 +71,7 @@ public SpiClockConfiguration.Mode SpiBusMode
         protected ISpiCommunications spiComms;
 
         readonly IDigitalOutputPort dataCommandPort;
-        readonly IDigitalOutputPort resetPort;
+        readonly IDigitalOutputPort? resetPort;
 
         readonly BufferGray4 imageBuffer;
 
@@ -85,8 +85,8 @@ public SpiClockConfiguration.Mode SpiBusMode
         /// <param name="chipSelectPin">Chip select pin</param>
         /// <param name="dcPin">Data command pin</param>
         /// <param name="resetPin">Reset pin</param>
-        public Ssd1327(ISpiBus spiBus, IPin chipSelectPin, IPin dcPin, IPin resetPin)
-            : this(spiBus, chipSelectPin?.CreateDigitalOutputPort(false), dcPin?.CreateDigitalOutputPort(false), resetPin?.CreateDigitalOutputPort(true))
+        public Ssd1327(ISpiBus spiBus, IPin? chipSelectPin, IPin dcPin, IPin? resetPin)
+            : this(spiBus, chipSelectPin?.CreateDigitalOutputPort(false) ?? null, dcPin.CreateDigitalOutputPort(false), resetPin?.CreateDigitalOutputPort(true) ?? null)
         {
         }
 
@@ -98,9 +98,9 @@ public Ssd1327(ISpiBus spiBus, IPin chipSelectPin, IPin dcPin, IPin resetPin)
         /// <param name="dataCommandPort">Data command output port</param>
         /// <param name="resetPort">Reset output port</param>
         public Ssd1327(ISpiBus spiBus,
-            IDigitalOutputPort chipSelectPort,
+            IDigitalOutputPort? chipSelectPort,
             IDigitalOutputPort dataCommandPort,
-            IDigitalOutputPort resetPort)
+            IDigitalOutputPort? resetPort)
         {
             imageBuffer = new BufferGray4(Width, Height);