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210 lines
7.4 KiB
HTML
210 lines
7.4 KiB
HTML
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<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>
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<p><a class='wikilink' href='Serial.html'>Serial</a>
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</p>
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<p class='vspace'></p><h2>available()</h2>
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<h4>Description</h4>
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<p>Get the number of bytes (characters) available for reading from the serial port. This is data that's already arrived and stored in the serial receive buffer (which holds 128 bytes).
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</p>
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<p class='vspace'></p><h4>Syntax</h4>
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<p>Serial.available()
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</p>
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<p class='vspace'></p><p><em>Arduino Mega only:</em> <br />Serial1.available() <br />Serial2.available() <br />Serial3.available()
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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 available to read
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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_Read.html'>Serial.read</a>()
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</li><li><a class='wikilink' href='Serial_Flush.html'>Serial.flush</a>()
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</li></ul><p class='vspace'></p><p><a class='wikilink' href='index.html'>Reference Home</a>
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