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    <p>Since bytes may come in at any time, buffering incoming data is critical. So you should</p> <ol> <li>buffer the incoming data</li> <li>scan your buffer to find complete data</li> <li>remove the used data from the buffer</li> </ol> <p>I am just wondering if you are still having problems with the serial port. If so, I developed a serial port programming language in C# and I believe it solves nearly all of the problems that everybody encounters with. </p> <p>Would you please take a look and try it ? For example; you can buffer incoming data from the serial port like the following and do string operations easily.</p> <pre><code>state Init // define a global variable our $BUFFER = ""; jump(Receive); end state state Receive recv(); $len = length($DATA_PACKET); if("$len &gt; 0") { $BUFFER += $DATA_PACKET; call(Parser); } end state state Parser // check if buffer matchs regular expression pattern if(match($BUFFER, "(?&lt;WILLDELETE&gt;.*?&lt;STX&gt;(?&lt;DATA&gt;.*?)&lt;ETX&gt;(?&lt;CHECKSUM&gt;[0-9A-F]{2}))")) { // Received complete data $lenData = length($WILLDELETE); $BUFFER = remove($BUFFER, 0, $lenData); // Do operations with the other parsed fields. $DATA and $CHECKSUM in this example. } end state </code></pre> <p>Project is freely available on sourceforge and if you have any questions, please feel free to ask.</p> <p><a href="http://sourceforge.net/projects/anyserialport/" rel="nofollow">Project Homepage</a></p> <p><a href="http://sourceforge.net/projects/anyserialport/" rel="nofollow">Download Link</a></p>
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