first commit

Software/CSharp/GrovePi/Sensors/LedBar.cs

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+using System;
+
+namespace GrovePi.Sensors
+{
+    public interface ILedBar
+    {
+        ILedBar Initialize(Orientation orientation);
+        ILedBar SetOrientation(Orientation orientation);
+        ILedBar SetLevel(byte level);
+        ILedBar SetLed(byte level, byte led, SensorStatus state);
+        ILedBar ToggleLed(byte led);
+    }
+
+    internal class LedBar : ILedBar
+    {
+        private const byte InitialiseCommandAddress = 50;
+        private const byte OrientationCommandAddress = 51;
+        private const byte LevelCommandAddress = 52;
+        private const byte SetOneCommandAddress = 53;
+        private const byte ToggleOneCommandAddress = 54;
+        //private const byte SetCommandAddress = 55;
+        //private const byte GetCommandAddress = 56;
+
+        private readonly GrovePi _device;
+        private readonly Pin _pin;
+
+        internal LedBar(GrovePi device, Pin pin)
+        {
+            if (device == null) throw new ArgumentNullException(nameof(device));
+            _device = device;
+            _pin = pin;
+        }
+
+        public ILedBar Initialize(Orientation orientation)
+        {
+            var buffer = new[] {InitialiseCommandAddress, (byte) _pin, (byte) orientation, Constants.Unused};
+            _device.DirectAccess.WritePartial(buffer);
+            return this;
+        }
+
+        public ILedBar SetOrientation(Orientation orientation)
+        {
+            var buffer = new[] {OrientationCommandAddress, (byte) _pin, (byte) orientation, Constants.Unused};
+            _device.DirectAccess.WritePartial(buffer);
+            return this;
+        }
+
+        public ILedBar SetLevel(byte level)
+        {
+            level = Math.Min(level, (byte) 10);
+            var buffer = new[] {LevelCommandAddress, (byte) _pin, level, Constants.Unused};
+            _device.DirectAccess.WritePartial(buffer);
+            return this;
+        }
+
+        public ILedBar SetLed(byte level, byte led, SensorStatus state)
+        {
+            var buffer = new[] {SetOneCommandAddress, (byte) _pin, led, (byte) state};
+            _device.DirectAccess.WritePartial(buffer);
+            return this;
+        }
+
+        public ILedBar ToggleLed(byte led)
+        {
+            var buffer = new[] {ToggleOneCommandAddress, (byte) _pin, led, Constants.Unused};
+            _device.DirectAccess.WritePartial(buffer);
+            return this;
+        }
+    }
+
+    public enum Orientation
+    {
+        RedToGreen = 0,
+        GreenToRed = 1
+    }
+}