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POSerialPort ReadLine() after Thread.Sleep() goes crazy
 

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    <p>I've been fighting with this issue for a day and I can't find answer for it. I am trying to read data from GPS device trough COM port in Compact Framework C#. I am using SerialPort class (actually my own ComPort class boxing SerialPort, but it adds only two fields I need, nothing special). </p> <p>Anyway, I am running while loop in a separate thread which reads line from the port, analyze NMEA data, print them, catch all exceptions and then I Sleep(200) the thread, because I need CPU for other threads... Without Sleep it works fine, but uses 100% CPU.. When I don't use Sleep after few minutes the output from COM port looks like this:</p> <blockquote> <p>GPGSA,A,3,09,12,22,17,15,27,,,,,,,2.6,1.6,2.1*3F<br> GSA,A,3,09,12,22,17,15,27,,,,,,,2.6,1.6,2.1*3F<br> A,A,3,09,12,22,17,15,27,,,,,,,2.6,1.6,2.1*3F<br> ,18,12,271,24,24,05,020,24,14,04,326,25,11,03,023,*76<br> A,3,09,12,22,17,15,27,,,,,,,2.6,1.6,2.1*3F<br> 3,09,12,22,17,15,27,,,,,,,2.6,1.6,2.1*3F<br> 09,12,22,17,15,27,,,,,,,2.6,1.6,2.1*3F<br> ,12,22,17,15,27,,,,,,,2.6,1.6,2.1*3F </p> </blockquote> <p>as you can see the same message is read few times but <strong>cut</strong>. I wonder what I'm doing wrong... My port configuration:</p> <pre><code>port.ReadBufferSize = 4096; port.BaudRate = 4800; port.DataBits = 8; port.Parity = Parity.None; port.StopBits = StopBits.One; port.NewLine = "\r\n"; port.ReadTimeout = 1000; port.ReceivedBytesThreshold = 100000; </code></pre> <p>And my reading function:</p> <pre><code>private void processGps(){ while (!closing) { //reconnect if needed try { string sentence = port.ReadLine(); //here print the sentence //analyze the sentence (this takes some time 50-100ms) } catch (TimeoutException) { Thread.Sleep(0); } catch (IOException ioex) { //handling IO exception (some info on the screen) } Thread.Sleep(200); } } </code></pre> <p>There is some more stuff in this function like reconnection if the device is lost etc., but it is not called when the GPS is connected properly. I was trying</p> <pre><code>port.DiscardInBuffer(); </code></pre> <p>after some blocks of code (in TimeoutException, after read.)</p> <p>Did anyone had similar problem? I really dont know what I'm doing wrong.. The only way to get rig of it is removing the last Sleep.</p>
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    1. COHave you considered async operations instead of sleeping?
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