Re: [ts-7000] Re: java recommendations

[Dave Cramer <>]

I think I also modified their source code to deal with putting the port into raw mode.

Chris can give your our rxtx libraries.

Dave

On 6-Aug-07, at 1:31 PM, tedapt wrote:

I'm trying to use /dev/ttyAM0 to communicate with another device using
the Modbus protocol. My Java application runs as a Modbus master,
connects to the other device which acts as a Modbus slave.

! My setup is:
- a TS-7250 (only COM1 is wired)
- Debian Sarge loaded from a USB drive
- JamVM
- rxtx 2.1 (with a symlink created from /dev/ttyAM0 to /dev/ttySO) to
allow rxtx to find the port

I appear to be able to find and write to the serial port, but fail
when trying to read.

I've removed jumper JP2, commented out the line in /etc/inittab that
initializes getty on /dev/ttyAM0. I've confirmed that there are no
getty processes running on /dev/ttyAM0 (ps -ef | grep getty) also
modified by RedBoot startup script to use ttyAM1 as the console
instead of ttyAM0.

I notice that stty gives different output before and after I attempt
to run my application. Do I need to configure the serial port through
Debian somehow? This is the output from stty:

Before application attempt:

:root# stty -F /dev/ttyAM0
speed 115200 baud; line = 0;
min = 1; time = 0;
-brkint -icrnl -imaxbel
-opost -onlcr
-isig -icanon -iexten -echo -echoe -echok -echoctl -echoke

After application attempt:

:hawkeye# stty -F /dev/t! tyAM0
speed 9600 baud; line = 0;
min = 0; time = 2;
-brkint -icrnl -imaxbel
-opost -onlcr
-isig -icanon -iexten -echo -echoe -echok -echoctl -echoke

Thanks for your help!

--- In .com, Christopher Friedt <cfriedt! @...> wrote:
>
> Hmm...
>
> What exactly are you trying to do with /dev/ttyAM0 ? Is it just to
get a
> console on the device? if so, you might have to add it to
/etc/securetty
> as well.
>
> ~/Chris
>
> tedapt wrote:
> > Ugh! Editing the getty setup lines in /etc/inittab didn't fix it,
> > still cannot read on /dev/ttyAM0. Anything else you had to do to
> > configure the port, like use stty to tweak the port settings or
> > something similar?
> >
> > Are you also running Debian on a TS-7250 loaded from a USB drive?
> > That adds a level of complexity for me, as I have to allow getty to
> > use /dev/ttyAM0 until I get Debian running or the script that enables
> > USB modules won't load (/usr/bin/loadUSBModules.sh), then I can kill
> > the getty process. But I wonder if that script may somehow hang onto
> > the port?
> >
> > --- In .com, justin@ wrote:
> >> yes, after the os boots you will no longer have com access. If you
> >> remove the jumpers on the board, jp2? It will prevent console on
the
> >> com during the boot. You could just comment out com1 and send the
> >> console stuff to com2. I needed both so I had to ditch the console.
> >>
> >> Justin
> >> Quoting tedapt <tedapt@>:
> >>
> >>> great! will give this a try in a few days when back on my
system. Did
> >>> a quick search on /etc/inittab, from what I gather this contains
> >>> instructions for starting up the getty process to manage user logins
> >>> on the console via the serial port(?) If that's right, do you think
> >>> commenting it out will prevent use of the serial port for accessing
> >>> the board (handy when ethernet is unavailable)?
> >>>
> >>> --- In .com, justin@ wrote:
> >>>> Got it to work. You have to disable the consol on the com ports.
> >>>> Look at your /etc/inittab. Comment out any lines with the com
> >>> ports
> >>>> name in it. I am using b! oth ports so I commented out both: ttyAM0
> >>> and
> >>>> ttyAM1.
> >>>>
> >>>> Quoting tedapt <tedapt@>:
> >>&! gt;>
> >>>>> OK, I'll let you know whatever I find too. Won't be able to get
> >>> back
> >>>>> to this and retest for a few days though. My test plan is to
> >>> write a
> >>>>> Java app that will listen for data on the serial port, and echo it
> >>>>> when received.
> >>>>>
> >>>>> One thing I've noticed is that if I try to start a listening app
> >>> on
> >>>>> the port it seems to lock the port at the OS level. I was then
> >>> unable
> >>>>> to access the port through the command line (e.g., echo
> >>>>>> /dev/ttyS0). Wonder if this ! may be related to the read problem?
> >>> If
> >>>>> that's so, wonder if there's a way to share the port between
> >>> multiple
> >>>>> clients?
> >>>>>
> >>>>> --- In .com, justin@ wrote:
> >! ;>>>>> Hey,
> >>>>>>
> >>>>>> Yeah, I am having a similar problem. I can write just fine. I
> >>> set
> >>>>> up
> >>>>>> a comm connection to the hyper term. But I can't receive
> >>> anything
> >>>>>> back. I'll let you know what I find. I ended up building my own
> >>>>> rxtx
> >>>>>> lib! , but same problem so I don't think thats the issue.> >>>>>>
> >>>>>>
> >>>>>> Quoting tedapt <tedapt@>:
> >>>>>>
> >>>>>>> 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/tt! yS0).
> >>>>> 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 wa! s 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 .com, justin@ 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.SerialPor! ts=/dev/ttyAM0:/dev/ttyAM1 foo
> >>>>>>>>
> >>>>>>>> The other way:
> >>>>>>>> RXTXComm! Driver.java is
> >>>>>>>> available in ftp://ftp.qbang.org/pub/rxtx/rx tx-2.0-7pre2/src/
> >>>>>>> Download the
> >>>>>>>> RXTXCommDriver.java. In this code, you will find
> >>>>>>>>
> >>>>>>>> if (osName.equals ("Linux")) { String[]Temp = { "ttyS", //
> >>> linux
> >>>>>>> Serial
> >>>>>>>&! gt; Ports "ttySA" // for the IPAQs }; CandidatePortPrefix es =
> >>> 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 <tedapt@>:
> >>>>>>>>
> >>>>>>>>> Can anyone clarify Dave's statement about the use of rxtx:
> >>>>>>>>>! < BR style="font-family: Georgia; font-size: 13px; line-height: 15px; ">> >>>>>>>>> > 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 thu! mbdrive
> >>>>>>>>> - 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
> >>>&g! t;> r esults:
> >>>>>>>>> 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");
> &g t;>>>>>>>> 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,
> >>>>>>>>> Seri! alPort.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");
> >>>>>>&g! t;>&g t; throw piu;
> >>>>>>>>> } catch (UnsupportedCommOperationException usc) {
> >>>>>>>>> System.out.println("Unable to configure
> >>>>>>> port:"+portName);
> >>>>>>>>> throw usc;
> >>>>>>>>> } catch (IOException ioe) {
> >>&g! t;>>>>>> System.out.println(
> >>>>>>>>> "Unable to acquire I/O
> >>> streams
> >>>>> for
> >>>>>>> port
> >>>>>>>>> " + portName);
> >>>>>>>>> throw ioe;
> >>>>>>>>> }
> >>>>>>>>> } catch (Exception e) {
> >>>>>>>>> Sys! tem.out.println(e.getMessage());
> >>>>>>>>> e.printStackTrace();
> >>>>>>>>> }
> >>>>>>>>> }
> >>>>>>>>>
> >>>>>>>>> }
> >>>>>>>>>
> >>>>&g! t;>&g t;>> --- In .com, 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
> >>>>>>>>>>
> >>>>>>>>>> no! te: 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
> >>>>>>>! ; functi ons 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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