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<p class='vspace'></p><h2><span class='wikiword'>SoftwareSerial</span>: overflow()</h2>
<h4>Description</h4>
<p>Tests to see if a software serial buffer overflow has occurred.  Calling this function clears the overflow flag, meaning that subsequent calls will return false unless another byte of data has been received and discarded in the meantime.
</p>
<p class='vspace'></p><p>The software serial buffer can hold 64 bytes.
</p>
<p class='vspace'></p><h4>Syntax</h4>
<p>mySerial.overflow()
</p>
<p class='vspace'></p><h4>Parameters</h4>
<p>none
</p>
<p class='vspace'></p><h4>Returns</h4>
<p>boolean
</p>
<p class='vspace'></p><h4>Example</h4>
<p>
<div class='sourceblock ' id='sourceblock1'>
  <div class='sourceblocktext'><div class="arduino"><span class="co2">#include &lt;SoftwareSerial.h&gt;</span><br />
<br />
<span class="co1">// software serial : TX = digital pin 2, RX = digital pin 3</span><br />
SoftwareSerial portOne<span class="br0">&#40;</span><span class="nu0">2</span><span class="sy0">,</span> <span class="nu0">3</span><span class="br0">&#41;</span><span class="sy0">;</span><br />
<br />
<span class="kw1">void</span> <span class="kw3">setup</span><span class="br0">&#40;</span><span class="br0">&#41;</span><br />
<span class="br0">&#123;</span><br />
&nbsp; <span class="co1">// Start the hardware serial port</span><br />
&nbsp; <span class="kw1">Serial</span>.<span class="kw1">begin</span><span class="br0">&#40;</span><span class="nu0">9600</span><span class="br0">&#41;</span><span class="sy0">;</span><br />
<br />
&nbsp; <span class="co1">// Start software serial port</span><br />
&nbsp; portOne.<span class="kw1">begin</span><span class="br0">&#40;</span><span class="nu0">9600</span><span class="br0">&#41;</span><span class="sy0">;</span><br />
<span class="br0">&#125;</span><br />
<br />
<span class="kw1">void</span> <span class="kw3">loop</span><span class="br0">&#40;</span><span class="br0">&#41;</span><br />
<span class="br0">&#123;</span><br />
&nbsp; <span class="kw1">if</span> <span class="br0">&#40;</span>portOne.<span class="me1">overflow</span><span class="br0">&#40;</span><span class="br0">&#41;</span><span class="br0">&#41;</span> <span class="br0">&#123;</span><br />
&nbsp; &nbsp;<span class="kw1">Serial</span>.<span class="kw1">println</span><span class="br0">&#40;</span><span class="st0">&quot;SoftwareSerial overflow!&quot;</span><span class="br0">&#41;</span><span class="sy0">;</span> <br />
<span class="br0">&#125;</span></div></div>
  <div class='sourceblocklink'><a href='#' type='text/plain'>[Get Code]</a></div>
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</p>
<p class='vspace'></p><h4>See also</h4>
<ul><li><a class='wikilink' href='SoftwareSerialConstructor.html'>SoftwareSerial</a>()
</li><li><a class='wikilink' href='SoftwareSerialRead.html'>read</a>()
</li><li><a class='wikilink' href='SoftwareSerialPrint.html'>print</a>()
</li><li><a class='wikilink' href='SoftwareSerialPrintln.html'>println</a>()
</li></ul><p><a class='wikilink' href='index.html'>Reference Home</a>
</p>
<p class='vspace'></p><p><em>Corrections, suggestions, and new documentation should be posted to the <a class='urllink' href='http://arduino.cc/forum/index.php/board,23.0.html' rel='nofollow'>Forum</a>.</em>
</p>
<p class='vspace'></p><p>The text of the Arduino reference is licensed under a
<a class='urllink' href='http://creativecommons.org/licenses/by-sa/3.0/' rel='nofollow'>Creative Commons Attribution-ShareAlike 3.0 License</a>.  Code samples in the reference are released into the public domain.
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