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POHow to solve error java.io.IOException: Input/output error in nativeavailable for Serial Communication?
 

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  1. POHow to solve error java.io.IOException: Input/output error in nativeavailable for Serial Communication?
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    <p>I have Arm processor which is AllWinner A13 ,RAM- 512mb, and OS- Linaro 13.01 Ubuntu (means debian). Now i m making Serial Communication program for /dev/ttyS0. i made simple program for Two Way Serial Communication in java with netbeans. In my processor i short rx-tx of ttyS0 for loop back coonection checking. Means what ever i send through Serial port that i get return back. but i get error. i installed openjdk-7, librxtx-java on my processor. my code and error is below. If any have idea or solution then please suggest to me.</p> <pre><code>package serialcomm_linaro; import gnu.io.CommPort; import gnu.io.CommPortIdentifier; import gnu.io.SerialPort; import java.io.FileDescriptor; import java.io.IOException; import java.io.InputStream; import java.io.OutputStream; public class TwoWaySerialComm { public TwoWaySerialComm() { super(); } void connect ( String portName ) throws Exception { CommPortIdentifier portIdentifier = CommPortIdentifier.getPortIdentifier(portName); if ( portIdentifier.isCurrentlyOwned() ) { System.out.println("Error: Port is currently in use"); } else { CommPort commPort = portIdentifier.open(this.getClass().getName(),2000); if ( commPort instanceof SerialPort ) { SerialPort serialPort = (SerialPort) commPort; serialPort.setSerialPortParams(115200,SerialPort.DATABITS_8,SerialPort.STOPBITS_1,SerialPort.PARITY_NONE); InputStream in = serialPort.getInputStream(); OutputStream out = serialPort.getOutputStream(); (new Thread(new SerialReader(in))).start(); (new Thread(new SerialWriter(out))).start(); } else { System.out.println("Error: Only serial ports are handled by this example."); } } } /** */ public static class SerialReader implements Runnable { InputStream in; public SerialReader ( InputStream in ) { this.in = in; } public void run () { byte[] buffer = new byte[1024]; int len = -1; try { while ( ( len = this.in.read(buffer)) &gt; -1 ) { System.out.print(new String(buffer,0,len)); } } catch ( IOException e ) { e.printStackTrace(); } } } /** */ public static class SerialWriter implements Runnable { OutputStream out; public SerialWriter ( OutputStream out ) { this.out = out; } public void run () { try { int c = 0; while ( ( c = System.in.read()) &gt; -1 ) { this.out.write(c); } } catch ( IOException e ) { e.printStackTrace(); } } } public static void main ( String[] args ) { try { (new TwoWaySerialComm()).connect("/dev/ttyS0"); } catch ( Exception e ) { // TODO Auto-generated catch block e.printStackTrace(); } } } </code></pre> <p>my out is below . In this out i just send 123 and i get return back 23 first and then 1111... more time, and then errore. Instead of 111111.... i want only return back 123.</p> <pre><code>enter code here RXTX Warning: Removing stale lock file. /var/lock/LCK..ttyS0 123 23 111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111 java.io.IOExcepti on: Input/output error in nativeavailable at gnu.io.RXTXPort.nativeavailable(Native Method) at gnu.io.RXTXPort$SerialInputStream.read(RXTXPort.java:1429) at gnu.io.RXTXPort$SerialInputStream.read(RXTXPort.java:1341) at serialcomm_linaro.TwoWaySerialComm$SerialReader.run(TwoWaySerialComm.java:66) at java.lang.Thread.run(Thread.java:722) </code></pre>
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