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Hello,
I try to launch the example read/write PC<->RCX.
The RCX part (Read) is compiled and downloaded.
But I don't managed to the PC's part (write).
It compiles with lejosjc.bat.
But with java.exe, the following error message appears :
-----------------------
D:\developpement\mindstorms\lejos\rcxcomm\examples\instream>java Write
Exception in thread "main" java.lang.UnsatisfiedLinkError: init
at josx.rcxcomm.LLC.init(Native Method)
at josx.rcxcomm.LLCHandler.<init>(LLCHandler.java:18)
at josx.rcxcomm.RCXPort.<init>(RCXPort.java:18)
at Write.main(Write.java:9)
---------------------------------------
With all my reads on the net, I think it is a problem of CLASSPATH.
I define it just like this :
-------------------------------------------------------------
D:\developpement\mindstorms\lejos\rcxcomm\examples\instream>set CLASSPATH
CLASSPATH=D:\developpement\mindstorms\lejos\lib\rcxcomm.jar;D:\developpement\min
dstorms\lejos\lib\pcrcxcomm.jar;D:\developpement\mindstorms\lejos\lib\classes.ja
r;D:\developpement\mindstorms\lejos\lib\jtools.jar;"C:\Program Files\Java\jdk1.5
.0_09\bin";D:\developpement\mindstorms\lejos\classes;
--------------------------------------------------------------------------
I don't understand. Can u help me ?
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Hello Paul,
first of all, thank you very much for providing LeJOS.
I am a member of the project team for the master courses at the
University of Applied Studies and Research in Wernigerode, Germany
(Hochschule Harz). In our project thesis we decided to work on the
Mindstorms by using LeJOS. Our goal was to improve the navigation
functions (odometry) for two-wheeled robots which are only using their
rotation sensors. We included a software PID controller that is capable
of correcting errors of the movement caused by the plastic parts and the
divergence of the motor power.
The so called lejON-API is not like the RotationNavigator class but is a
little bit more precise in driving and much more precise in
self-location. Additionally, the user is able to let the bot curve
circularly. All LeJOS methods are low-level functions. So, we only have
to adapt those for NXT.
If you like, take a look at lejON which is available as an Open Source
project at http://lejon.sourceforge.net/.
Feel free to download everything and construct the bots provided online.
There is lots of documentation with a big part about evaluation. Sadly,
this is currently available in German only. We are working on English
versions (but it may take a while as we all are working on other things
like master theses and an article and a presentation about lejON for a
local symposium in October).
In case of any questions, please contact me via this address. We are
looking forward to hearing from you!
Best regards on behalf of the project team,
Florian Ruh
Diplom-Informatiker (FH)
Hochschule Harz in Wernigerode, Germany
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In lugnet.robotics.rcx.java, Alfred Bratterud wrote:
> Anyone know when Lejos will be ported to the NXT? Just got my kit and looking
> forward to it!
There is a sort-of port available on lejos.sourceforge.net now:
> iCommand allows you to program your robot and control
> it using your Bluetooth connection
Apparently, the API uses existing firmware functionality to control
the NXT brick from the host computer using Java, it's not a proper
Java VM for local execution.
There is little or no documentation, and no examples yet, but
they seem to have it working, and I guess some brief tutorial
is in the making.
Stefan G
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Anyone know when Lejos will be ported to the NXT? Just got my kit and looking
forward to it!
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In lugnet.robotics.rcx.java, Erik Amzallag wrote:
| |
Hi,
I’m starting with lejos and I try to use the plugin LDT 1.2.0 for Eclipse 3.0
with Windows XP. When I try to run (Run As > leJOS), I get the message :
|
snip
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My classpath, path, lejos_home and RCXTTY are ok, commands like lejosjc,
lejoslink and lejosdl work fine.
With Eclipse, I get the item leJOS > Install Firmware (which works), I can
create leJOS RCX project, but I don’t succeed to run my program :(
I’ve surely missed something, and I find nothing about that.
If you can help me, it will be great :)
|
It seems that some people meet the same problem, so the answer :
You must set in your project properties your “Default output folder” as
yourProject/bin ( yourProject is the name of your project ;) )
Erik “brickerik” Amzallag
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In lugnet.robotics.rcx.java, Muhammad Arif Abdul Rahman wrote:
> I tried to follow the tutorial as close as I can, but I might have made some
> mistakes. I did set up the classpath, but I guess there are some mistakes there.
> Is there any way I can check what is in the classpath? Or shall I just redo the
> setup?
Well, now that I look over the instructions on leJOS, I see that they don't say
to set classpath. I think I always have, however. I haven't installed it on my
newish laptop, though, so I can't check.
Does someone with more experience want to field this one?
I guess there's no harm in trying to add it. Just to see if this works, you
could type it into the command line before trying to compile. It goes something
like
SET CLASSPATH=%CLASSPATH%;.;c:\lejos\classes\
and then try running lejosc to compile your program. See notes below for what
it's doing, but make sure that c:\lejos\classes\ points to the classes folder
installed as part of lejos. If you put it someplace other than c:\lejos, you'll
need to modify this.
If it works, once you close the command prompt window, you'll need to do it
again in the next one. I keep a batch file of these things, so I can set
several things at once without having to remember them.
If this works and you want to set it for your system, depending on your version
of Windows:
*Go to Control Panel
*Choose System
*Click the Advanced tab
*Click the Environment Variables tab
*Look for CLASSPATH--the Java installation probably added one. If so, you can
click the EDIT button and change it; if not, you can click the NEW button and
add an environment variable named CLASSPATH.
*If you already have a classpath, add ;.;C:\lejos\classes\
The first semicolon is to separate . from the preceding entry; . is the
directory you're in when you compile [if it's already in there, you don't need
to re-add it], and c:\lejos\classes\ is the path to the classes folder installed
with leJOS--modify as necessary to reflect your setup. You should already have
the path for the Java install in your classpath--if you don't, I think you would
have gotten more errors than you actually did.
Let me know if this works.
Peter
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In lugnet.robotics.rcx.java, Peter F. Guenther wrote:
> In lugnet.robotics.rcx.java, Muhammad Arif Abdul Rahman wrote:
> > Hi all,
> >
> > I'm trying lejos for the first time, but i cant get it working. i followed the
> > tutorial on the lejos homepage.
> > when i tried to compile motion.java, 9 errors come up with the first one saying
> > that package josx.vision does not exist. this is what i got:
> >
> > Motion.java:1: package josx.vision does not exist
>
> My lejos book is at school, but my first question would be, have you set up your
> classpath correctly? If josx.vision is a real thing, you shouldn't get that
> first error.
>
> Peter
Hi Peter,
I tried to follow the tutorial as close as I can, but I might have made some
mistakes. I did set up the classpath, but I guess there are some mistakes there.
Is there any way I can check what is in the classpath? Or shall I just redo the
setup?
Thanks
Arif
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In lugnet.robotics.rcx.java, Muhammad Arif Abdul Rahman wrote:
> Hi all,
>
> I'm trying lejos for the first time, but i cant get it working. i followed the
> tutorial on the lejos homepage.
> when i tried to compile motion.java, 9 errors come up with the first one saying
> that package josx.vision does not exist. this is what i got:
>
> Motion.java:1: package josx.vision does not exist
My lejos book is at school, but my first question would be, have you set up your
classpath correctly? If josx.vision is a real thing, you shouldn't get that
first error.
Peter
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Hi all,
I'm trying lejos for the first time, but i cant get it working. i followed the
tutorial on the lejos homepage.
when i tried to compile motion.java, 9 errors come up with the first one saying
that package josx.vision does not exist. this is what i got:
Motion.java:1: package josx.vision does not exist
import josx.vision.*;
^
Motion.java:3: cannot resolve symbol
symbol : class MotionListener
location : class Motion
public class Motion implements MotionListener {
^
... and another 7 cannot resolve symbol errors similar to the second one.
can anybody points out why this is happening? is there anything i missed out
while installing the whole thing? or is it the arrangement of the files in my
lejos folder?
please help if you know the solution.
thanks.
arif
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Hi!
I'm controlling my robot with the navigator class. For my recent visual servoing
project I need to stop the current travel command and call it once again with
new distance information. The old movement should be stopped and the new one
started.
The travel method normally returns when the movement is stopped. So how can i
stop the travel method before the movement is completed.
Would be great if you could help me.
christian
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I got lucky and now have a NXT on my desk, thanks to the MDP. Now is a good
time to make suggestions for the API of the NXT lejos.
Roger Glassey
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Hi Jason,
you have to loop within your main program, otherwise main() will be left.
E.g. use
while (true) {
Thread.sleep (1000);
}
or, use a button listener, and exit when some button has been pressed.
HTH, Jochen
> -----Ursprüngliche Nachricht-----
> Von: news-gateway@lugnet.com [mailto:news-gateway@lugnet.com]Im Auftrag
> von JasonQ
> Gesendet: Mittwoch, 10. August 2005 17:11
> An: lugnet.robotics.rcx.java@lugnet.com
> Betreff: lejos program terminating immediately
>
>
> Hi,
>
> I'm trying to use leJOS to display the current value of the
> rotation sensor I
> have hooked up to Sensor Port 1, but when I run the program, the
> RCX just beeps
> and ends the program immediately. Here's my code:
>
>
>
> import josx.platform.rcx.*;
>
> public class Rot_test
> {
> public static void main (String[] args) throws Exception
> {
> Sensor.S1.setTypeAndMode (SensorConstants.SENSOR_TYPE_ROT,
> SensorConstants.SENSOR_MODE_ANGLE);
> Sensor.S1.addSensorListener(new SensorListener() {
> public void stateChanged(Sensor aSource, int aOldValue, int
> aNewValue){
> LCD.clear();
> Integer i = new Integer(aNewValue);
> String s = i.toString();
> TextLCD.print(s);
> }
> });
> Sensor.S1.activate();
> }
> }
>
>
>
>
> I have a question about leJOS that may be related to this (and I
> think it may
> have to do with the problem I'm having). When a leJOS program is
> set up, and
> the program finishes executing all of the code in the main(String[] args)
> method, does the program just end?
>
> I think the problem with my code may be that I set up the
> listeners, but after
> the program finishes reading all of the code in the method, it
> just exits and
> never watches the rotation sensor.
>
>
>
> Does anyone know why I'm having this problem or what it is?
>
>
> Thanks,
>
> Jason
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Hi,
I'm trying to use leJOS to display the current value of the rotation sensor I
have hooked up to Sensor Port 1, but when I run the program, the RCX just beeps
and ends the program immediately. Here's my code:
import josx.platform.rcx.*;
public class Rot_test
{
public static void main (String[] args) throws Exception
{
Sensor.S1.setTypeAndMode (SensorConstants.SENSOR_TYPE_ROT,
SensorConstants.SENSOR_MODE_ANGLE);
Sensor.S1.addSensorListener(new SensorListener() {
public void stateChanged(Sensor aSource, int aOldValue, int
aNewValue){
LCD.clear();
Integer i = new Integer(aNewValue);
String s = i.toString();
TextLCD.print(s);
}
});
Sensor.S1.activate();
}
}
I have a question about leJOS that may be related to this (and I think it may
have to do with the problem I'm having). When a leJOS program is set up, and
the program finishes executing all of the code in the main(String[] args)
method, does the program just end?
I think the problem with my code may be that I set up the listeners, but after
the program finishes reading all of the code in the method, it just exits and
never watches the rotation sensor.
Does anyone know why I'm having this problem or what it is?
Thanks,
Jason
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Hi,
I’m starting with lejos and I try to use the plugin LDT 1.2.0 for Eclipse 3.0
with Windows XP. When I try to run (Run As > leJOS), I get the message :
An internal error occurred during: “Launching”.
java.lang.IllegalArgumentException: Path must include project and resource name:
/test_mind
org.eclipse.core.internal.utils.Assert.isLegal(Assert.java:58)
org.eclipse.core.internal.resources.Workspace.newResource(Workspace.java:1515)
org.eclipse.core.internal.resources.Container.getFile(Container.java:124)
org.lejos.tools.eclipse.plugin.launch.RunDelegate.launch(RunDelegate.java:63)
org.eclipse.debug.internal.core.LaunchConfiguration.launch(LaunchConfiguration.java:569)
org.eclipse.debug.internal.ui.DebugUIPlugin.buildAndLaunch(DebugUIPlugin.java:788)
org.eclipse.debug.internal.ui.DebugUIPlugin$6.run(DebugUIPlugin.java:955)
org.eclipse.core.internal.jobs.Worker.run(Worker.java:66)
My classpath, path, lejos_home and RCXTTY are ok, commands like lejosjc,
lejoslink and lejosdl work fine.
With Eclipse, I get the item leJOS > Install Firmware (which works), I can
create leJOS RCX project, but I don’t succeed to run my program :(
I’ve surely missed something, and I find nothing about that.
If you can help me, it will be great :)
Erik “brickerik” Amzallag
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I would like to announce the release of Jurtle 1.8, a simple IDE for learning
programming in Java.
What makes this release pertinent to this group is that Jurtle now integrates
with the LeJOS tools and API for programming the LEGO Mindstorms Robotics
system. You can write, compile and download your Java code for the Mindstorms
robots all from within the Jurtle IDE.
For more information, or to download your fully functional evaluation copy,
visit the Otherwise web site at: <http://www.otherwise.com/Jurtle.html>
--
Bill Tschumy
Otherwise -- Austin, TX
http://www.otherwise.com
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Hi Armin,
"Armin Buttinger" <a.buttinger@t-online.de> writes:
>
> I have a RCX and three Sensors. I want to have the three sensor-values on the
> LCD-screen.
> I had an idea: changing the sensor-integer-values in String, so
> I have the 3 Values in a String I am showing on the LCD-screen.
> But if I run this in an endless-loop, the program shut down.
>
> why?
probably because it runs out of memory.
This is hard to avoid with strings, as Lejos doesn't garbage collect memory.
Either you generate too many strings, or you have an old version
of Lejos that is not careful enough in TextLCD.
To check if it was indeed out of memory you can look
which exception was raised, look in the README for instructions.
Jürgen
--
NO to software patents -- stop the European patents directive
Jürgen Stuber <juergen@jstuber.net>
http://www.jstuber.net/
gnupg key fingerprint = 2767 CA3C 5680 58BA 9A91 23D9 BED6 9A7A AF9E 68B4
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In lugnet.robotics.rcx.java, Armin Buttinger wrote:
> I have a RCX and three Sensors. I want to have the three sensor-values on the
> LCD-screen.
> I had an idea: changing the sensor-integer-values in String, so
> I have the 3 Values in a String I am showing on the LCD-screen.
> But if I run this in an endless-loop, the program shut down.
>
> why?
>
> Can somebody help me?
Can you post your source code (or the relevant bits at least)?
Thomas
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I have a RCX and three Sensors. I want to have the three sensor-values on the
LCD-screen.
I had an idea: changing the sensor-integer-values in String, so
I have the 3 Values in a String I am showing on the LCD-screen.
But if I run this in an endless-loop, the program shut down.
why?
Can somebody help me?
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In lugnet.robotics.rcx.java, Chris Dodds wrote:
> js.classfile.EClassFileFormat: Version not recognized: 46.0
http://news.lugnet.com/robotics/rcx/java/?n=365
Whenever you encounter a problem with LEGO robotics of any sort it is a very
good idea to search the Lugnet newsgroups before posting a question. In this
case I searched for "version not recognized" and found a post that will probably
solve the problem for you. If it doesn't then email or post again.
John Hansen
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Hi guys, im trying to get the Lejos vision package set up on
my computer for a university project. I've got the motion example that comes
with the package compiling but I'me still getting an error when I try to run it:
Exception reading josx/vision/Vision
js.classfile.EClassFileFormat: Version not recognized: 46.0
at js.classfile.JClassFile.readMagicAndVersions(JClassFile.java:226)
at js.classfile.JClassFile.read(JClassFile.java:255)
at js.tinyvm.ClassRecord.getClassRecord(ClassRecord.java:427)
at js.tinyvm.ClassRecord.storeReferredClasses(ClassRecord.java:217)
at js.tinyvm.Binary.processClasses(Binary.java:105)
at js.tinyvm.Binary.createFromClosureOf(Binary.java:258)
at js.tinyvm.TinyVM.main(TinyVM.java:109)
at js.tinyvm.TinyVM.main(TinyVM.java:100)
at js.tinyvm.TinyVM.main(TinyVM.java:216)
at js.tinyvm.TinyVM.main(TinyVM.java:250)
I'm not the best java man in the world so I'm not sure what it
means, I guess its a problem with the vision file in the package? If you could
suggest any ways to fix the problem I would be very grateful because
this is a very important piece of work and im running out of
time! Cheers. Chris.
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