add support for MCP3002 converter

Raspberry.IO.Components/Converters/Mcp3002/Mcp3002AnalogPinExtensionMethods.cs

@@ -0,0 +1,20 @@
+namespace Raspberry.IO.Components.Converters.Mcp3002
+{
+    public static class Mcp3002AnalogPinExtensionMethods
+    {
+        #region Methods
+
+        /// <summary>
+        /// Creates an analog input pin.
+        /// </summary>
+        /// <param name="connection">The connection.</param>
+        /// <param name="channel">The channel.</param>
+        /// <returns>The pin.</returns>
+        public static Mcp3002InputAnalogPin In(this Mcp3002SpiConnection connection, Mcp3002Channel channel)
+        {
+            return new Mcp3002InputAnalogPin(connection, channel);
+        }
+
+        #endregion
+    }
+}

Raspberry.IO.Components/Converters/Mcp3002/Mcp3002Channel.cs

@@ -0,0 +1,8 @@
+namespace Raspberry.IO.Components.Converters.Mcp3002
+{
+    public enum Mcp3002Channel
+    {
+        Channel0 = 0,
+        Channel1 = 1
+    }
+}

Raspberry.IO.Components/Converters/Mcp3002/Mcp3002InputAnalogPin.cs

@@ -0,0 +1,47 @@
+namespace Raspberry.IO.Components.Converters.Mcp3002
+{
+    public class Mcp3002InputAnalogPin : IInputAnalogPin
+    {
+        #region Fields
+
+        private readonly Mcp3002SpiConnection connection;
+        private readonly Mcp3002Channel channel;
+
+        #endregion
+
+        #region Instance Management
+
+        /// <summary>
+        /// Initializes a new instance of the <see cref="Mcp3002InputAnalogPin" /> class.
+        /// </summary>
+        /// <param name="connection">The connection.</param>
+        /// <param name="channel">The channel.</param>
+        public Mcp3002InputAnalogPin(Mcp3002SpiConnection connection, Mcp3002Channel channel)
+        {
+            this.connection = connection;
+            this.channel = channel;
+        }
+
+        /// <summary>
+        /// Performs application-defined tasks associated with freeing, releasing, or resetting unmanaged resources.
+        /// </summary>
+        public void Dispose(){}
+
+        #endregion
+
+        #region Methods
+
+        /// <summary>
+        /// Reads the value of the pin.
+        /// </summary>
+        /// <returns>
+        /// The value.
+        /// </returns>
+        public AnalogValue Read()
+        {
+            return connection.Read(channel);
+        }
+
+        #endregion
+    }
+}

Raspberry.IO.Components/Converters/Mcp3002/Mcp3002SpiConnection.cs

@@ -0,0 +1,85 @@
+#region References
+
+using System;
+using Raspberry.IO.SerialPeripheralInterface;
+
+#endregion
+
+namespace Raspberry.IO.Components.Converters.Mcp3002
+{
+    /// <summary>
+    /// Represents a connection to MCP3002 ADC converter.
+    /// </summary>
+    public class Mcp3002SpiConnection : IDisposable
+    {
+        #region Fields
+
+        private readonly SpiConnection spiConnection;
+
+        #endregion
+
+        #region Instance Management
+
+        /// <summary>
+        /// Initializes a new instance of the <see cref="Mcp3002SpiConnection"/> class.
+        /// </summary>
+        /// <param name="clockPin">The clock pin.</param>
+        /// <param name="slaveSelectPin">The slave select pin.</param>
+        /// <param name="misoPin">The miso pin.</param>
+        /// <param name="mosiPin">The mosi pin.</param>
+        public Mcp3002SpiConnection(IOutputBinaryPin clockPin, IOutputBinaryPin slaveSelectPin, IInputBinaryPin misoPin, IOutputBinaryPin mosiPin)
+        {
+            spiConnection = new SpiConnection(clockPin, slaveSelectPin, misoPin, mosiPin, Endianness.LittleEndian);
+        }
+
+        /// <summary>
+        /// Performs application-defined tasks associated with freeing, releasing, or resetting unmanaged resources.
+        /// </summary>
+        void IDisposable.Dispose()
+        {
+            Close();
+        }
+
+        #endregion
+
+        #region Methods
+
+        /// <summary>
+        /// Reads the specified channel.
+        /// </summary>
+        /// <param name="channel">The channel.</param>
+        /// <returns>The value</returns>
+        public AnalogValue Read(Mcp3002Channel channel)
+        {
+            using(spiConnection.SelectSlave())
+            {
+                // Start bit
+                spiConnection.Write(true);
+
+                // Channel is single-ended
+                spiConnection.Write(true);
+
+                // Channel Id
+                spiConnection.Write((byte)channel, 1);
+
+                // Let one clock to sample
+                spiConnection.Synchronize();
+
+                // Read 10 bits
+                var data = (int)spiConnection.Read(10);
+
+                return new AnalogValue(data, 0x3FF);
+            }
+        }
+
+        /// <summary>
+        /// Closes this instance.
+        /// </summary>
+        public void Close()
+        {
+            spiConnection.Close();
+        }
+
+        #endregion
+    }
+}

Raspberry.IO.Components/Raspberry.IO.Components.csproj

@@ -65,6 +65,10 @@
     <Compile Include="Controllers\Tlc59711\Tlc59711Settings.cs" />
     <Compile Include="Controllers\Tlc59711\Tlc59711Connection.cs" />
     <Compile Include="Controllers\Tlc59711\Tlc59711Device.cs" />
+    <Compile Include="Converters\Mcp3002\Mcp3002AnalogPinExtensionMethods.cs" />
+    <Compile Include="Converters\Mcp3002\Mcp3002Channel.cs" />
+    <Compile Include="Converters\Mcp3002\Mcp3002InputAnalogPin.cs" />
+    <Compile Include="Converters\Mcp3002\Mcp3002SpiConnection.cs" />
     <Compile Include="Converters\Mcp3008\Mcp3008AnalogPinExtensionMethods.cs" />
     <Compile Include="Controllers\Pca9685\IPwmDevice.cs" />
     <Compile Include="Controllers\Pca9685\PwmChannel.cs" />