You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
122 lines
4.1 KiB
HTML
122 lines
4.1 KiB
HTML
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
|
|
<html>
|
|
<head>
|
|
<title>Arduino - Available </title>
|
|
<link rel='stylesheet' href='arduino.css' type='text/css' />
|
|
<meta name="verify-v1" content="TtxFIEJAB6zdJ509wLxjnapQzKAMNm9u0Wj4ho6wxIY=" />
|
|
</head>
|
|
<body>
|
|
<div id="page">
|
|
<!--PageHeaderFmt-->
|
|
<div id="pageheader">
|
|
<div class="title"><a href="http://www.arduino.cc"/>Arduino</a></div>
|
|
<div class="search">
|
|
<!-- SiteSearch Google -->
|
|
<FORM method=GET action="http://www.google.com/search">
|
|
<input type=hidden name=ie value=UTF-8>
|
|
<input type=hidden name=oe value=UTF-8>
|
|
<INPUT TYPE=text name=q size=25 maxlength=255 value="">
|
|
<INPUT type=submit name=btnG VALUE="search">
|
|
<input type=hidden name=domains value="http://www.arduino.cc/">
|
|
<input type=hidden name=sitesearch value="http://www.arduino.cc/">
|
|
</FORM>
|
|
<!-- SiteSearch Google -->
|
|
</div>
|
|
</div>
|
|
<!--/PageHeaderFmt-->
|
|
<!--PageLeftFmt-->
|
|
<div id="pagenav" style="text-align: right">
|
|
<div style="float: left;">
|
|
<p><a class='wikilink' href='http://arduino.cc/en/Main/Buy'>Buy</a>
|
|
|
|
|
<a class='wikilink' href='http://arduino.cc/en/Main/Software'>Download</a>
|
|
|
|
|
<a class='wikilink' href='Guide_index.html'>Getting Started</a>
|
|
|
|
|
<a class='wikilink' href='http://arduino.cc/en/Tutorial/HomePage'>Learning</a>
|
|
|
|
|
<a class='wikilink' href='index.html'>Reference</a>
|
|
|
|
|
<a class='wikilink' href='http://arduino.cc/en/Main/Hardware'>Hardware</a>
|
|
|
|
|
<a class='wikilink' href='FAQ.html'>FAQ</a>
|
|
</p>
|
|
<p class='vspace'></p>
|
|
|
|
</div>
|
|
<a class="urllink" href="http://www.arduino.cc/blog/" rel="nofollow">Blog »</a> |
|
|
<a class="urllink" href="http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl" rel="nofollow">Forum »</a> |
|
|
<a class="urllink" href="http://www.arduino.cc/playground/" rel="nofollow">Playground »</a>
|
|
</div>
|
|
<!--/PageLeftFmt-->
|
|
<div id="pagetext">
|
|
<!--PageText-->
|
|
<div id='wikitext'>
|
|
<h2>int Serial.available()</h2>
|
|
<h4>Description</h4>
|
|
<p>Get the number of bytes (characters) available for reading over the serial port.
|
|
</p>
|
|
<p class='vspace'></p><h3>Parameters</h3>
|
|
<p>None
|
|
</p>
|
|
<p class='vspace'></p><h4>Returns</h4>
|
|
<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.
|
|
</p>
|
|
<p class='vspace'></p><h3>Example</h3>
|
|
<pre>
|
|
int incomingByte = 0; // for incoming serial data
|
|
|
|
void setup() {
|
|
Serial.begin(9600); // opens serial port, sets data rate to 9600 bps
|
|
}
|
|
|
|
void loop() {
|
|
|
|
// send data only when you receive data:
|
|
if (Serial.available() > 0) {
|
|
// read the incoming byte:
|
|
incomingByte = Serial.read();
|
|
|
|
// say what you got:
|
|
Serial.print("I received: ");
|
|
Serial.println(incomingByte, DEC);
|
|
}
|
|
}
|
|
|
|
</pre>
|
|
<p class='vspace'></p><p><strong>Arduino Mega example:</strong>
|
|
</p>
|
|
<p class='vspace'></p><pre>
|
|
void setup() {
|
|
Serial.begin(9600);
|
|
Serial1.begin(9600);
|
|
|
|
}
|
|
|
|
void loop() {
|
|
// read from port 0, send to port 1:
|
|
if (Serial.available()) {
|
|
int inByte = Serial.read();
|
|
Serial1.print(inByte, BYTE);
|
|
|
|
}
|
|
// read from port 1, send to port 0:
|
|
if (Serial1.available()) {
|
|
int inByte = Serial1.read();
|
|
Serial.print(inByte, BYTE);
|
|
}
|
|
}
|
|
|
|
</pre>
|
|
<p class='vspace'></p><h4>See also</h4>
|
|
<ul><li><a class='wikilink' href='Serial_Begin.html'>Serial.begin</a>(speed)
|
|
</li><li><a class='wikilink' href='Serial_Read.html'>Serial.read</a>()
|
|
</li><li><a class='wikilink' href='Serial_Print.html'>Serial.print</a>(data)
|
|
</li><li><a class='wikilink' href='Serial_Println.html'>Serial.println</a>(data)
|
|
</li></ul><p class='vspace'></p><p><a class='wikilink' href='index.html'>Reference Home</a>
|
|
</p>
|
|
</div>
|
|
|
|
</div>
|
|
<!--PageFooterFmt-->
|
|
<div id="pagefooter">
|
|
<a href='Serial_Available?action=edit.html'>Edit Page</a> | <a href='Serial_Available?action=diff.html'>Page History</a> | <a href='Serial_Available?action=print.html' target='_blank'>Printable View</a> | <a href='http://arduino.cc/en/Site/AllRecentChanges'>All Recent Site Changes</a>
|
|
</div>
|
|
<!--/PageFooterFmt-->
|
|
</div>
|
|
</body>
|
|
</html>
|