120 lines
4 KiB
HTML
120 lines
4 KiB
HTML
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html>
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<head>
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<title>Arduino - Available </title>
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<link rel='stylesheet' href='arduino.css' type='text/css' />
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</head>
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<body>
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<div id="page">
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<!--PageHeaderFmt-->
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<div id="pageheader">
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<div class="title"><a href="http://www.arduino.cc"/>Arduino</a></div>
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<div class="search">
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<!-- SiteSearch Google -->
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<FORM method=GET action="http://www.google.com/search">
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<input type=hidden name=ie value=UTF-8>
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<input type=hidden name=oe value=UTF-8>
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<INPUT TYPE=text name=q size=25 maxlength=255 value="">
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<INPUT type=submit name=btnG VALUE="search">
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<input type=hidden name=domains value="http://www.arduino.cc/">
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<input type=hidden name=sitesearch value="http://www.arduino.cc/">
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</FORM>
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<!-- SiteSearch Google -->
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</div>
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</div>
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<!--/PageHeaderFmt-->
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<!--PageLeftFmt-->
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<div id="pagenav" style="text-align: right">
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<div style="float: left;">
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<p><a class='wikilink' href='http://arduino.cc/en/Main/Buy'>Buy</a>
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<a class='wikilink' href='http://arduino.cc/en/Main/Software'>Download</a>
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<a class='wikilink' href='Guide_index.html'>Getting Started</a>
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<a class='wikilink' href='http://arduino.cc/en/Tutorial/HomePage'>Learning</a>
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<a class='wikilink' href='index.html'>Reference</a>
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<a class='wikilink' href='http://arduino.cc/en/Main/Hardware'>Hardware</a>
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<a class='wikilink' href='FAQ.html'>FAQ</a>
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</p>
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<p class='vspace'></p>
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</div>
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<a class="urllink" href="http://www.arduino.cc/blog/" rel="nofollow">Blog »</a> |
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<a class="urllink" href="http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl" rel="nofollow">Forum »</a> |
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<a class="urllink" href="http://www.arduino.cc/playground/" rel="nofollow">Playground »</a>
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</div>
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<!--/PageLeftFmt-->
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<div id="pagetext">
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<!--PageText-->
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<div id='wikitext'>
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<h2>int Serial.available()</h2>
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<h4>Description</h4>
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<p>Get the number of bytes (characters) available for reading over the serial port.
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</p>
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<p class='vspace'></p><h3>Parameters</h3>
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<p>None
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</p>
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<p class='vspace'></p><h4>Returns</h4>
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<p>The number of bytes are available to read in the serial buffer, or 0 if none are available. If any data has come in, Serial.available() will be greater than 0. The serial buffer can hold up to 128 bytes.
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</p>
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<p class='vspace'></p><h3>Example</h3>
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<pre>
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int incomingByte = 0; // for incoming serial data
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void setup() {
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Serial.begin(9600); // opens serial port, sets data rate to 9600 bps
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}
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void loop() {
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// send data only when you receive data:
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if (Serial.available() > 0) {
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// read the incoming byte:
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incomingByte = Serial.read();
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// say what you got:
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Serial.print("I received: ");
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Serial.println(incomingByte, DEC);
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}
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}
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</pre>
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<p class='vspace'></p><p><strong>Arduino Mega example:</strong>
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</p>
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<p class='vspace'></p><pre>
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void setup() {
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Serial.begin(9600);
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Serial1.begin(9600);
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}
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void loop() {
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// read from port 0, send to port 1:
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if (Serial.available()) {
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int inByte = Serial.read();
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Serial1.print(inByte, BYTE);
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}
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// read from port 1, send to port 0:
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if (Serial1.available()) {
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int inByte = Serial1.read();
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Serial.print(inByte, BYTE);
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}
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}
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</pre>
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<p class='vspace'></p><h4>See also</h4>
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<ul><li><a class='wikilink' href='Serial_Begin.html'>Serial.begin</a>(speed)
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</li><li><a class='wikilink' href='Serial_Read.html'>Serial.read</a>()
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</li><li><a class='wikilink' href='Serial_Print.html'>Serial.print</a>(data)
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</li><li><a class='wikilink' href='Serial_Println.html'>Serial.println</a>(data)
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</li></ul><p class='vspace'></p><p><a class='wikilink' href='index.html'>Reference Home</a>
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</p>
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</div>
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</div>
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