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PObug in serial port communication
 

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    <p>I might just have the weirdest bug you've heard today.</p> <p>I have this one (very long) method inside a thread, which sends formatted data to a RS232 Led Display. </p> <p>It should display something like this</p> <pre><code>TITLE SUBTITLE 1 ELEMENT 1 ELEMENT 2 SUBTITLE 2 ELEMENT 1 ELEMENT 2 ELEMENT 3 </code></pre> <p>well, each one on it's own message.</p> <p>I'm calling Thread.Sleep(N) after each one of the messages (so each message is displayed N time).</p> <ul> <li>N being the number of seconds</li> </ul> <p>Ok, everything is fine until now. The thing is that if <code>(10 &lt;= N &lt;= 20)</code> I get the following output:</p> <pre><code>TITLE TITLE TITLE TITLE TITLE TITLE TITLE TITLE </code></pre> <p>I can hear the <em>beep</em> when I send the message. I even installed a serial port monitor, to check if the information I was sending was the same.</p> <p>So just to summarize:</p> <p>Writing on Serial Port works after sleeping the thread for n &lt;= 9 or n >= 20. Anything in between will produce an erroneous output, like if the output was cached or something</p> <p>What can this be?</p> <p><strong>Update</strong></p> <ul> <li>Ok, I know System.Threading.Sleep takes miliseconds as arguments. just multiply the number by 1000.</li> <li>Whenever the led display receives a new well formatted message, it beeps. I should have clarified that.</li> </ul> <p>Here is a snippet (this sends the first title)</p> <pre><code> using (var ld = new LedScreen(COM)) { ld.AddEffect(LedScreen.Effects.Snow); ld.AddText(LedScreen.Colors.Red, titulos[ThreadControl.Fase]); ld.AddEffect(LedScreen.Effects.DSnow); ld.Write(); } //Console.WriteLine(titulos[ThreadControl.Fase]); //esperamos N tiempo (titulo) Thread.Sleep(TiempoTitulo); </code></pre> <p>I wrote the LedScreen class. The write method is this one:</p> <pre><code> public void Write() { //caracteres de terminacion buffer.AddRange(new byte[] { 0xBF, 0xB1 }); try { if (!sp.IsOpen) sp.Open(); sp.Write(buffer.ToArray(), 0, buffer.Count); } finally { sp.Close(); } } </code></pre> <p><strong>Update 2</strong></p> <p>I finally got it to work (ugly fix, but meh.)</p> <p>Before each write to the serial port, I send a "blank" message with no delay. That clears the screen, before sending the actual message. hooray! and it works for whatever amount of seconds I sleep the thread</p>
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    1. COCan you post a code snippet surrounding the sleep and sending of the serial message?
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    2. COThere is a known issue with the serial comms component since .NET 2.0...it was hoped that it would be addressed in .NET 3.5 but nope...
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    3. COThere's nothing in your question that would allow anybody to diagnose what the problem might be. Find out what "beep" means. SerialPort doesn't beep.
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      1. USHans Passant
 

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