Add the Pimoroni Blinkt device binding

src/devices/Blinkt/Blinkt.cs

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+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+using System;
+using System.Device.Gpio;
+using System.Threading;
+using System.Drawing;
+
+namespace Iot.Device.Blinkt
+{
+    /// <summary>
+    /// Driver for the Pimoroni Blinkt LED strip for Raspbery Pi
+    /// https://shop.pimoroni.com/products/blinkt
+    ///
+    /// This is a strip of 8 pixels that can be indendently controlled over GPIO.
+    ///
+    /// Setting the color is a 2-step process:
+    /// Set the color using Clear, SetPixel, or SetAll
+    /// Call Show to update the physical pixels
+    /// </summary>
+    public class Blinkt : IDisposable
+    {
+        private const int DAT = 23;
+        private const int CLK = 24;
+        private const int BRIGHTNESS = 7;
+
+        /// <summary>
+        /// The number of pixels in the Blinkt strip
+        /// </summary>
+        public const int NUMBER_OF_PIXELS = 8;
+
+        private readonly Color[] _pixels = new Color[NUMBER_OF_PIXELS];
+        private readonly int _sleepTime = 0;
+        private readonly GpioController _gpio;
+
+        private bool _gpioSetup = false;
+
+        /// <summary>
+        /// Initializes a new instance of the <see cref="Blinkt"/> class.
+        /// </summary>
+        public Blinkt()
+        {
+            for (int i = 0; i < NUMBER_OF_PIXELS; i++)
+            {
+                _pixels[i] = Color.Empty;
+            }
+
+            _gpio = new GpioController();
+        }
+
+        /// <inheritdoc />
+        public void Dispose()
+        {
+            Clear();
+            Show();
+
+            _gpio.Dispose();
+        }
+
+        /// <summary>
+        /// Sets the brightness of all the pixels
+        /// </summary>
+        /// <param name="brightness">The brightess for the pixels</param>
+        public void SetBrightness(byte brightness)
+        {
+            for (var i = 0; i < NUMBER_OF_PIXELS; i++)
+            {
+                _pixels[i] = Color.FromArgb(brightness, _pixels[i]);
+            }
+        }
+
+        /// <summary>
+        /// Clears all the LEDs by turning them off.
+        ///
+        /// After calling Clear, you must call Show to update the LEDs.
+        /// </summary>
+        public void Clear()
+        {
+            SetAll(Color.Empty);
+        }
+
+        /// <summary>
+        /// Shows the current state of the LEDs by applying the colors and brightness to the LEDs.
+        /// </summary>
+        public void Show()
+        {
+            if (!_gpioSetup)
+            {
+                _gpio.OpenPin(DAT, PinMode.Output);
+                _gpio.OpenPin(CLK, PinMode.Output);
+                _gpioSetup = true;
+            }
+
+            Sof();
+
+            foreach (Color pixel in _pixels)
+            {
+                int r = pixel.R;
+                int g = pixel.G;
+                int b = pixel.B;
+                int brightness = (int)(31.0 * (pixel.A / 255.0)) & 0b11111;
+                WriteByte(0b11100000 | brightness);
+                WriteByte(b);
+                WriteByte(g);
+                WriteByte(r);
+            }
+
+            Eof();
+        }
+
+        /// <summary>
+        /// Sets the color of all the pixels.
+        /// This does not update the physical pixel, you must call Show to display the color.
+        /// </summary>
+        /// <param name="color">The color to set the pixel to</param>
+        public void SetAll(Color color)
+        {
+            for (var i = 0; i < NUMBER_OF_PIXELS; i++)
+            {
+                SetPixel(i, color);
+            }
+        }
+
+        /// <summary>
+        /// Gets the color that the specified pixel is set to.
+        /// This may not reflect the actual color of the LED if Show has not been called.
+        /// </summary>
+        /// <param name="pixel">The index of the pixel to get</param>
+        /// <returns>The color of the pixel </returns>
+        public Color GetPixel(int pixel)
+        {
+            if (pixel < 0 || pixel >= NUMBER_OF_PIXELS)
+            {
+                throw new ArgumentOutOfRangeException(nameof(pixel), $"Pixel must be between 0 and {NUMBER_OF_PIXELS - 1}");
+            }
+
+            return _pixels[pixel];
+        }
+
+        /// <summary>
+        /// Sets the color of the specified pixel to the specified color.
+        /// This does not update the physical pixel, you must call Show to display the color.
+        /// </summary>
+        /// <param name="pixel">The index of the pixel to update</param>
+        /// <param name="color">The color to set on the pixel</param>
+        /// <exception cref="ArgumentOutOfRangeException">The value of pixel must be between 0 and 7, otherwise this exception is thrown</exception>
+        public void SetPixel(int pixel, Color color)
+        {
+            if (pixel < 0 || pixel >= NUMBER_OF_PIXELS)
+            {
+                throw new ArgumentOutOfRangeException(nameof(pixel), $"Pixel must be between 0 and {NUMBER_OF_PIXELS - 1}");
+            }
+
+            _pixels[pixel] = color;
+        }
+
+        private void WriteByte(int b)
+        {
+            for (var i = 0; i < 8; i++)
+            {
+                _gpio.Write(DAT, (b & 0b10000000) != 0);
+                _gpio.Write(CLK, PinValue.High);
+                Thread.Sleep(_sleepTime);
+                b <<= 1;
+                _gpio.Write(CLK, PinValue.Low);
+                Thread.Sleep(_sleepTime);
+            }
+        }
+
+        private void Eof()
+        {
+            _gpio.Write(DAT, PinValue.Low);
+            for (var i = 0; i < 36; i++)
+            {
+                _gpio.Write(CLK, PinValue.High);
+                Thread.Sleep(_sleepTime);
+                _gpio.Write(CLK, PinValue.Low);
+                Thread.Sleep(_sleepTime);
+            }
+        }
+
+        private void Sof()
+        {
+            _gpio.Write(DAT, PinValue.Low);
+            for (var i = 0; i < 32; i++)
+            {
+                _gpio.Write(CLK, PinValue.High);
+                Thread.Sleep(_sleepTime);
+                _gpio.Write(CLK, PinValue.Low);
+                Thread.Sleep(_sleepTime);
+            }
+        }
+    }
+}

src/devices/Blinkt/Blinkt.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFrameworks>$(DefaultBindingTfms)</TargetFrameworks>
+    <!--Disabling default items so samples source won't get build by the main library-->
+    <EnableDefaultItems>false</EnableDefaultItems>
+    <LangVersion>9</LangVersion>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <Compile Include="*.cs" />
+    <None Include="README.md" />
+  </ItemGroup>
+
+</Project>

src/devices/Blinkt/Blinkt.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio 15
+VisualStudioVersion = 15.0.26124.0
+MinimumVisualStudioVersion = 15.0.26124.0
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Blinkt", "Blinkt.csproj", "{B82C190A-642B-465B-BD3F-DB56FFF22253}"
+EndProject
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+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Blinkt.Samples", "samples\Blinkt.Samples.csproj", "{3CFA13D6-1D29-4C87-B0C1-01A6901A50EF}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Common", "..\Common\Common.csproj", "{584651BB-91DA-4FFE-B32C-F13DD7BCE100}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Debug|x64 = Debug|x64
+		Debug|x86 = Debug|x86
+		Release|Any CPU = Release|Any CPU
+		Release|x64 = Release|x64
+		Release|x86 = Release|x86
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
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src/devices/Blinkt/README.md

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+# Blinkt
+
+## Summary
+
+[Blinkt!](https://shop.pimoroni.com/products/blinkt) offers eight APA102 pixels in the smallest (and cheapest) form factor to plug straight onto your Raspberry Pi.
+
+Each pixel on Blinkt! is individually controllable and dimmable allowing you to create gradients, pulsing effects, or just flash them on and off like crazy.
+
+## Binding Notes
+
+The Blinkt has 8 pixels that can be controlled independantly. This library is designed to mimic the functionality of the [Pimoroni Blinkt Python library](https://github.com/pimoroni/blinkt), except using System.Drawing.Color instead of separate R, G, B and brightness values. the Alpha channnel is used to set the brightness of the pixel.
+
+Setting the pixel values does not update the display. You must call the `Show` method to update the display. This allows you to configure how you want all the pixels to look before updating the display.
+
+## Usage
+
+Here is an example how to use the Blinkt:
+
+```csharp
+using System.Drawing;
+using Iot.Device.Blinkt;
+
+// Create the Blinkt
+var blinkt = new Blinkt();
+
+// Set all the pixels to random colors
+for (int i = 0; i < Blinkt.NUMBER_OF_PIXELS; i++)
+{
+    var color = Color.FromArgb(new Random().Next(0, 255), new Random().Next(0, 255), new Random().Next(0, 255));
+    blinkt.SetPixel(i, color);
+}
+
+// Update the display to show the new colors
+blinkt.Show();
+```
+
+## References
+
+[Blinkt on Pimoroni](https://shop.pimoroni.com/products/blinkt)

src/devices/Blinkt/category.txt

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+display
+led

src/devices/Blinkt/samples/Blinkt.Sample.cs

@@ -0,0 +1,49 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+using System;
+using System.Drawing;
+using System.Threading;
+using Iot.Device.Blinkt;
+
+// Light up pixels moving backwards and forwards in random colors
+
+// Create a new Blinkt instance
+Blinkt blinkt = new Blinkt();
+
+// A helper method to set a single pixel to a given color, clearing all others.
+// This also waits 100ms so the color can be seen
+static void SetOnePixel(Blinkt blinkt, Color color, int i)
+{
+    // Turn all pixels off first - this is not reflected in the hardware till we call Show
+    blinkt.Clear();
+
+    // Set the pixel at index i to the given color
+    blinkt.SetPixel(i, color);
+
+    // Update the hardware to reflect the changes
+    blinkt.Show();
+
+    // Wait for a bit before moving to the next pixel
+    Thread.Sleep(100);
+}
+
+// Loop forever
+while (true)
+{
+    // Generate a random color
+    Color color = Color.FromArgb(new Random().Next(0, 255), new Random().Next(0, 255), new Random().Next(0, 255));
+
+    // Loop through the pixels, lighting them in the given color
+    for (int i = 0; i < Blinkt.NUMBER_OF_PIXELS; i++)
+    {
+        SetOnePixel(blinkt, color, i);
+    }
+
+    // Loop through the pixels in reverse order, lighting them in the given color
+    // We skip the first pixel so there is a more pleasing bounce effect
+    for (int i = Blinkt.NUMBER_OF_PIXELS - 2; i >= 0; i--)
+    {
+        SetOnePixel(blinkt, color, i);
+    }
+}

src/devices/Blinkt/samples/Blinkt.Samples.csproj

@@ -0,0 +1,12 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>$(DefaultSampleTfms)</TargetFramework>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="../Blinkt.csproj" />
+  </ItemGroup>
+
+</Project>

src/devices/Blinkt/samples/README.md

@@ -0,0 +1,3 @@
+# TODO: This needs to be determined
+
+Help Wanted Please

src/devices/Device-Index.md

@@ -20,6 +20,7 @@
 * [AXP192 - Enhanced single Cell Li-Battery and Power System Management IC](Axp192/README.md)
 * [Bh1745 - RGB Sensor](Bh1745/README.md)
 * [BH1750FVI - Ambient Light Sensor](Bh1750fvi/README.md)
+* [Blinkt - 8-LED indicator strip](Blinkt/README.md)
 * [Bmm150 - Magnetometer](Bmm150/README.md)
 * [BMP180 - barometer, altitude and temperature sensor](Bmp180/README.md)
 * [BMxx80 Device Family](Bmxx80/README.md)