SoftwarePWMPort

SoftwarePWM.cs

using System.Threading;
using Microsoft.SPOT.Hardware;

public class SoftwarePWMPort : OutputPort
{
	private bool OffState;
	public SoftwarePWMPort(Cpu.Pin portID, bool initialState)
		: base(portID, initialState)
	{
		_t = new Thread(modulate);
		OffState = initialState;
	}

	private uint _b;
	public uint Brightness
	{
		get
		{
			return _b;
		}
		set
		{
			_b = value <= 100 ? value : 100;
			if (!_t.IsAlive)
			{
				_t = new Thread(modulate);
				_t.Start();
			}
		}
	}

	#region /* Legacy methods */
	public new void Write(bool state)
	{
		Brightness = state ? 100u : 0;
	}
	public new bool Read()
	{
		return _b > 0;
	}
	#endregion

	private Thread _t;
	private int i;

	///Actual method run within the thread
	private void modulate()
	{
		while (_b > 0 && _b < 100)
		{
			base.Write(!OffState);
			for (i = 0; i < _b; i++)
			{
				Thread.Sleep(0);
			}
			base.Write(OffState);
			for (; i < 100; i++)
			{
				Thread.Sleep(0);
			}
		}
	}
}