Implement the Windows I2C device (#46)

* Implement the Windows I2C device

src/System.Device.Gpio/System/Device/I2c/Windows10I2cDevice.Linux.cs

+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+namespace System.Device.I2c
+{
+    public class Windows10I2cDevice : I2cDevice
+    {
+        public Windows10I2cDevice(I2cConnectionSettings settings) =>
+            throw new PlatformNotSupportedException($"The {GetType().Name} class is not available on Linux.");
+
+        public override I2cConnectionSettings ConnectionSettings => throw new PlatformNotSupportedException();
+
+        public override byte ReadByte() => throw new PlatformNotSupportedException();
+
+        public override void Read(Span<byte> buffer) => throw new PlatformNotSupportedException();
+
+        public override void WriteByte(byte data) => throw new PlatformNotSupportedException();
+
+        public override void Write(Span<byte> data) => throw new PlatformNotSupportedException();
+    }
+}

src/System.Device.Gpio/System/Device/I2c/Windows10I2cDevice.Windows.cs

+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using Windows.Devices.Enumeration;
+using WinI2c = Windows.Devices.I2c;
+
+namespace System.Device.I2c
+{
+    public class Windows10I2cDevice : I2cDevice
+    {
+        private readonly I2cConnectionSettings _settings;
+        private WinI2c.I2cDevice _winDevice;
+
+        public Windows10I2cDevice(I2cConnectionSettings settings)
+        {
+            _settings = settings;
+            var winSettings = new WinI2c.I2cConnectionSettings(settings.DeviceAddress);
+
+            string deviceSelector = WinI2c.I2cDevice.GetDeviceSelector($"I2C{settings.BusId}");
+
+            DeviceInformationCollection deviceInformationCollection = DeviceInformation.FindAllAsync(deviceSelector).GetResults();
+            _winDevice = WinI2c.I2cDevice.FromIdAsync(deviceInformationCollection[0].Id, winSettings).GetResults();
+        }
+
+        public override I2cConnectionSettings ConnectionSettings => _settings;
+
+        public override byte ReadByte()
+        {
+            byte[] buffer = new byte[1];
+            _winDevice.Read(buffer);
+            return buffer[0];
+        }
+
+        public override void Read(Span<byte> buffer)
+        {
+            byte[] byteArray = new byte[buffer.Length];
+            _winDevice.Read(byteArray);
+            new Span<byte>(byteArray).CopyTo(buffer);
+        }
+
+        public override void WriteByte(byte data)
+        {
+            _winDevice.Write(new[] { data });
+        }
+
+        public override void Write(Span<byte> data)
+        {
+            _winDevice.Write(data.ToArray());
+        }
+
+        public override void Dispose(bool disposing)
+        {
+            _winDevice?.Dispose();
+            _winDevice = null;
+
+            base.Dispose(disposing);
+        }
+    }
+}

src/System.Device.Gpio/System/Device/Spi/Windows10SpiDevice.Linux.cs

@@ -6,7 +6,8 @@ namespace System.Device.Spi
 {
     public class Windows10SpiDevice : SpiDevice
     {
-        public Windows10SpiDevice(SpiConnectionSettings settings) => throw new PlatformNotSupportedException();
+        public Windows10SpiDevice(SpiConnectionSettings settings) =>
+            throw new PlatformNotSupportedException($"The {GetType().Name} class is not available on Linux.");
 
         public override SpiConnectionSettings ConnectionSettings => throw new PlatformNotSupportedException();
 

src/System.Device.Gpio/System/Device/Spi/Windows10SpiDevice.Windows.cs

@@ -9,7 +9,7 @@ namespace System.Device.Spi
 {
     public class Windows10SpiDevice : SpiDevice
     {
-        private SpiConnectionSettings _settings;
+        private readonly SpiConnectionSettings _settings;
         private WinSpi.SpiDevice _winDevice;
 
         public Windows10SpiDevice(SpiConnectionSettings settings)