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dustmouse

Member Since 03 Jan 2013
Offline Last Active Mar 18 2015 03:21 PM
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#43904 Button triggering multiple LEDs

Posted by dustmouse on 22 January 2013 - 03:43 AM

Hi Dave, thanks a lot for that great example.  It's a very nice implementation for syncing a bunch of blinkers.  I borrowed your use of IDisposable on your LED_Extension class and followed your conservative approach to thread creation.  

 

My final implementation (below) was slightly different because I am using a button event to turn the blinking LEDs on and off.  And because I was able to get the blinking LEDs to look closely synced by only creating the blinking thread once for each LED, I was able to keep with my foreach loop approach for turning the LEDs on/off.  

 

I also need to thank hanzibal for helping me arrive at a similar conclusion about threading.  

 

Oh, I ended up going with a ManualResetEvent because it doesn't automatically set the state to signal when it is encountered.  My Dispose() method looks a little sloppy to me and I think it can be simplified.  Anyway, here is the code (I made a couple edits to it):

 

public sealed class PulseLed : Led, IDisposable
    {
        private Thread pulseThread;
        private ManualResetEvent manualResetEvent;
        private bool isDisposed;
 
        #region Constructors
 
        public PulseLed(Cpu.Pin cpuPin) : base(cpuPin) 
        {
            this.manualResetEvent = new ManualResetEvent(true);
            this.isDisposed = false;
        }
 
        #endregion
 
        #region Public Properties
 
        public int PulseIntervalInMilliseconds { get; set; }
 
        #endregion
 
        #region IDisposable Members
 
        public void Dispose()
        {
            if (this.pulseThread != null && this.pulseThread.IsAlive)
            {
                this.manualResetEvent.Set();
                this.isDisposed = true;
                this.pulseThread.Join();
 
                if (base.State)
                    base.SetState(false);
            }
        }
 
        #endregion
 
        #region IOutputComponent Members
 
        public override bool State { get; protected set; }
 
        public override void SetState(bool state)
        {
            this.State = state;
 
            if (this.PulseIntervalInMilliseconds > 0)
            {
                if (this.State)
                {
                    if ((this.pulseThread == null || !this.pulseThread.IsAlive))
                    {
                        this.pulseThread = new Thread(new ThreadStart(this.pulse));
                        this.pulseThread.Start();
                    }
                    else
                        this.manualResetEvent.Set();
                }  
                else
                {
                    this.manualResetEvent.Reset();
 
                    if (base.State)
                        base.SetState(false);
                }
            }
            else
                base.SetState(state);
        }
 
        #endregion
 
        #region Private Methods
 
        private void pulse()
        {
            while (!this.isDisposed)
            {
                base.State = !base.State;
                base.outputPort.Write(base.State);
                Thread.Sleep(this.PulseIntervalInMilliseconds / 2);
 
                this.manualResetEvent.WaitOne();
            }
        }
 
        #endregion
    }

						

						

				
			


					

				

			

			

		

		

	


	
	


					

					
				

				
			

		

		
	








	
	
	
	
				
				
    
											
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