thanks Justin. I seem to have had some limited success with rxtx 2.1
(the one you mention first) by simply creating a symlink
from /dev/ttyAMO to /dev/ttyS0 (ln -s /dev/ttyAM0 /dev/ttyS0). Still
having problems communicating with a Modbus device, but otherwise
Java is acting like it finds and can open the serial port (of course
my "solution" may be part of the problem!)
Current problem is that though my app claims to open connections and
make Modbus requests on /dev/ttyS0, I'm unable to get a readable
response back (this code works properly on another platform). I need
to do some further testing with some simple Serial code to prove to
myself I can really write and read with the port properly.
I'm wondering if I need to configure my serial port somehow (not very
experienced with serial ports, not sure if that's required or takes
care of itself). My app sets connection params of 9600 baud, no
parity, 8 data bits, 1 stop bit. Anyone know if the linux system
(perhaps using stty) needs to configure the port to match this, or is
it only the client app at the other end of the communication that
needs to match the same parameters?
Also, I'm using JamVM, so my RXTXcomm.jar was placed
in /usr/lib/jamvm (also where I placed librxtxSerial.so)
Further, I was unable to enumerate the serial ports using rxtx 2.0.
I would settle for a working rxtx 2.1 solution, and from the rxtx
documentation it seems that rxtx 2.1 is the preferred solution when
possible to use it (i.e., when have ability to import gnu.io classes
instead of javax.comm).
--- In wrote:
>
> I am working on the same thing, didnt want to respond till I an
answer
>
> You can download the most current version of the arm-unknown-linux-
gnu
> binary at rxtx site:
> ftp://ftp.qbang.org/pub/rxtx/ToyBox/2.1-7-build1/Linux/glibc-
2.3.5/arm-unknown-linux-gnu/
>
> The easyest way to add the ttyAMx com ports is to set the system
properties:
> jamvm -Dgnu.io.rxtx.SerialPorts=/dev/ttyAM0:/dev/ttyAM1 foo
>
> The other way:
> RXTXCommDriver.java is
> available in ftp://ftp.qbang.org/pub/rxtx/rxtx-2.0-7pre2/src/
Download the
> RXTXCommDriver.java. In this code, you will find
>
> if (osName.equals ("Linux")) { String[]Temp = { "ttyS", // linux
Serial
> Ports "ttySA" // for the IPAQs }; CandidatePortPrefixes = Temp;
>
> Replace this code with
>
> if (osName.equals ("Linux")) { String[]Temp =
{ "ttyS", "ttyAM", // linux
> Serial Ports "ttySA" // for the IPAQs }; CandidatePortPrefixes =
Temp; }
>
> Compile the RXTXCommDriver.java and add the resulting
RXTXCommDriver.class
> file to RXTXcomm.jar
in /usr/java/jdk1.5.0_07/jre/lib/ext/RXTXcomm.jar
>
> Hope this help,
> Justin
>
>
>
> Quoting tedapt <>:
>
> > Can anyone clarify Dave's statement about the use of rxtx:
> >
> > > note: you have to add the arm's /dev/ttyAMx to rxtx, it
doesn't
> > know about them
> >
> > Also, any notes from anyone who has successfully setup and used
rxtx
> > with jamvm would be appreciated!
> >
> > The setup I'm attempting to get working is:
> >
> > - TS-7250
> > - debian on a USB thumbdrive
> > - jamvm installed via apt-get
> > - downloaded rxtx rxtx-2.0-7pre1 for Linux from:
> > http://users.frii.com/jarvi/rxtx/download.html (file at
> > ftp://ftp.qbang.org/pub/rxtx/rxtx-2.0-7pre1-i686-pc-linux-
gnu.tar.gz)
> > - extracted librxtxSerial.so and placed it in /usr/lib/jamvm
> > - using Sun's comm.jar (from a Java 1.3 distribution)
> >
> > When I invoke the test class (source below) I get these results:
> >
> > root# /usr/bin/jamvm -cp .:comm.jar SerialTest /dev/ttyAM0 9600
> > Specified serial port (/dev/ttyAM0) does not exist
> > null
> > javax.comm.NoSuchPortException
> > at
> > javax.comm.CommPortIdentifier.getPortIdentifier
(CommPortIdentifier.java:105)
> > at SerialTest.main(SerialTest.java:32)
> >
> > Here's source for SerialTest.java:
> >
> > import java.io.IOException;
> > import java.io.InputStream;
> > import java.io.OutputStream;
> > import java.util.Enumeration;
> >
> > import javax.comm.CommPortIdentifier;
> > import javax.comm.NoSuchPortException;
> > import javax.comm.PortInUseException;
> > import javax.comm.SerialPort;
> > import javax.comm.UnsupportedCommOperationException;
> >
> > public class SerialTest {
> >
> > private static SerialPort sp;
> > private static InputStream sin;
> > private static OutputStream sout;
> >
> > public static void main(String[] args) {
> > try {
> > if (args.length != 2) {
> > System.out.println("Usage: java
SerialTerm.tini port_name data_rate");
> > System.out.println("Available ports
are:\n");
> > Enumeration ports =
CommPortIdentifier.getPortIdentifiers();
> > while(ports.hasMoreElements()){
> > System.out.println
(ports.nextElement() + "\n");
> > }
> > System.exit(1);
> > }
> > String portName = args[0];
> > int baudRate = Integer.parseInt(args[1]);
> > try {
> > sp =
> > (SerialPort)CommPortIdentifier.getPortIdentifier(portName).open
("SerialTerm",
> > 5000);
> > sp.setSerialPortParams(baudRate,
SerialPort.DATABITS_8,
> > SerialPort.STOPBITS_1,
> > SerialPort.PARITY_NONE);
> > sin = sp.getInputStream();
> > sout = sp.getOutputStream();
> > } catch (NoSuchPortException nsp) {
> > System.out.println("Specified serial port ("+portName+
> > ") does not exist");
> > throw nsp;
> > } catch (PortInUseException piu) {
> > System.out.println("Serial port "+portName+
> > " in use by another application");
> > throw piu;
> > } catch (UnsupportedCommOperationException usc) {
> > System.out.println("Unable to configure
port:"+portName);
> > throw usc;
> > } catch (IOException ioe) {
> > System.out.println(
> > "Unable to acquire I/O streams for
port
> > " + portName);
> > throw ioe;
> > }
> > } catch (Exception e) {
> > System.out.println(e.getMessage());
> > e.printStackTrace();
> > }
> > }
> >
> > }
> >
> > --- In Dave Cramer <davec@> wrote:
> >>
> >> I've been running jamvm on mine for quite a while. You don't need
> >> jikes, unless you plan to compile on the arm (Very slow)
> >> I pulled alot of the gnuclasspath out, and the whole thing is
quite
> >> small. Around 4M or so
> >>
> >> you need rxtx for serial port work with java,, other than that
it's
> >> write once deploy everywhere
> >>
> >> note: you have to add the arm's /dev/ttyAMx to rxtx, it doesn't
know
> >> about them
> >>
> >> Dave
> >> On 7-Nov-06, at 8:57 PM, gunghoiguana wrote:
> >>
> >> > The install was much easier than I anticipated:
> >> >
> >> > apt-get install jikes
> >> > apt-get install jamvm
> >> > apt-get install jikes-classpath
> >> >
> >> > Everything seems to work fine, and I can run class files that I
> >> > compiled on my desktop PC. I've only checked out basic
functions and
> >> > console IO so far, but I'll be checking out the serial port and
> >> > network interfaces soon. Java is *supposed* to make those
things
> >> > easy...
> >> >
> >> > Brian
> >> >
> >> >
> >> >
> >>
> >
> >
> >
>
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