Add support for Sda5708 displays.

Raspberry.IO.Components/Displays/Sda5708/Sda5708Brightness.cs

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+using System;
+
+namespace Raspberry.IO.Components.Displays.Sda5708
+{
+	public enum Sda5708Brightness
+	{
+		Level100 = 0,
+		Level53 = 1,
+		Level40 = 2,
+		Level27 = 3,
+		Level20 = 4,
+		Level13 = 5,
+		Level6_6 = 6,
+		Level0 = 7
+	}
+}
+

Raspberry.IO.Components/Displays/Sda5708/Sda5708Connection.cs

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+/* Sda5708Connection
+ * Parts of this code are ported from https://github.com/pimium/sda5708
+ * which in turn used the information from http://www.sbprojects.com/knowledge/footprints/sda5708.php.
+ * The font is taken from http://sunge.awardspace.com/glcd-sd/node4.html
+ * with additional german characters added. */
+using System;
+using System.IO;
+using System.Text;
+using System.Linq;
+using System.Threading;
+using Raspberry.IO;
+using Raspberry.IO.GeneralPurpose;
+using System.Collections.Generic;
+
+namespace Raspberry.IO.Components.Displays.Sda5708
+{
+	public sealed class Sda5708Connection : IDisposable
+	{
+		private Sda5708Brightness _brightness = Sda5708Brightness.Level100;
+
+		private readonly ProcessorPin _load;
+		private readonly ProcessorPin _data;
+		private readonly ProcessorPin _sdclk;
+		private readonly ProcessorPin _reset;
+		private readonly GpioConnection _baseConnection;
+
+		public Sda5708Connection () : this(
+			ProcessorPin.Pin7, 
+			ProcessorPin.Pin8,
+			ProcessorPin.Pin18,
+			ProcessorPin.Pin23)
+		{
+		}
+
+		public Sda5708Connection (ProcessorPin load, ProcessorPin data, ProcessorPin sdclk, ProcessorPin reset)
+		{
+			this._load = load;
+			this._data = data;
+			this._sdclk = sdclk;
+			this._reset = reset;
+
+			this._baseConnection = new GpioConnection (
+				load.Output (),
+				data.Output (),
+				sdclk.Output (),
+				reset.Output ());
+
+			this._baseConnection [reset] = false;
+			this._baseConnection [reset] = false;
+			Thread.Sleep (50);
+			this._baseConnection [reset] = true;
+
+			this.Clear();
+		}
+
+		public void SetBrightness(Sda5708Brightness brightness)
+		{
+			this._brightness = brightness;
+			this.Write(0xe0 | (int)brightness);
+		}
+
+		public void Clear()
+		{
+			this.Write(0xc0 | (int)this._brightness);
+		}
+
+		public void WriteString(string str)
+		{
+			var chars = str
+				.PadRight (8, ' ')
+				.Substring (0, 8);
+
+			for(var i = 0; i < chars.Length; i++)
+			{
+				this.WriteChar (i, chars [i]);
+			}
+		}
+
+		private void WriteChar(int position, char value)
+		{
+			this.Write(0xa0 + position);
+
+			string[] pattern;
+			if (!Sda5708Font.Patterns.TryGetValue(value, out pattern))
+                pattern = Sda5708Font.Patterns['?'];
+
+			for(var i = 0; i < 7; i++)
+			{
+				this.Write (Convert.ToInt32 (pattern[i].Replace (' ', '0'), 2));
+			}
+		}
+
+		private void Write(int value)
+		{
+			this._baseConnection [this._sdclk] = false;
+			this._baseConnection [this._load] = false;
+
+			for(var i = 8; i > 0; i--)
+			{
+				this._baseConnection[this._data] = (value & 0x1) == 0x1;
+
+				this._baseConnection [this._sdclk] = true;
+				this._baseConnection [this._sdclk] = false;
+
+				value = value >> 1;
+			}
+
+			this._baseConnection [this._sdclk] = false;
+			this._baseConnection [this._load] = true;
+		}
+
+		#region IDisposable implementation
+		public void Dispose ()
+		{
+			this._baseConnection [this._reset] = false;
+			((IDisposable)this._baseConnection).Dispose ();
+		}
+		#endregion
+	}
+}