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linux:legomindstorms [2014/01/07 22:15] – [Second Attempt: LEJOS] rlunarolinux:legomindstorms [2014/01/07 23:46] – rlunaro
Line 181: Line 181:
  
 ===== Second Attempt: LEJOS ===== ===== Second Attempt: LEJOS =====
 +
 +==== Install ant ====
 +
 +You should have ''ant'' installed. To do so, 
 +
 +<code shell>
 +$ sudo apt-get install ant
 +</code>
 +
 +And should have ''libusb-dev'' installed also. 
 +
 +<code shell>
 +sudo apt-get install libusb-dev
 +</code>
 +
 +After doing that, make sure that the usb.h file is available in your destination system. 
 +
 +
 +==== Hands on ====
  
 [[http://www.lejos.org/|Lejos]] is a Java Virtual Machine for the RCX (the yellow box). It's a replacement for the Lego firmware, so, if your CD of mindstorms is broken, it's the perfect solution. [[http://www.lejos.org/|Lejos]] is a Java Virtual Machine for the RCX (the yellow box). It's a replacement for the Lego firmware, so, if your CD of mindstorms is broken, it's the perfect solution.
Line 187: Line 206:
  
 When I've checked out the web page, the download link didn't work. But you can go directly to the [[http://sourceforge.net/projects/lejos|sourceforge webpage]] in order to download the files.  When I've checked out the web page, the download link didn't work. But you can go directly to the [[http://sourceforge.net/projects/lejos|sourceforge webpage]] in order to download the files. 
 +
 +When you download and uncompress the file ''leJOS_NXJ_0.9.1beta-3.tar.gz'', you should check out the README.html file. 
 +
 +Then start by setting the environment variable NXJ_HOME: 
 +
 +<code shell>
 +$ cd LEJOS_NXJ_DIRECTORY   # the files ACKNOWLEDGMENTS.txt, LICENSE.txt, RELEASENOTES.txt should be there
 +$ NXJ_HOME=$(pwd)
 +$ export NXJ_HOME
 +</code>
 +
 +Then go to the ''build'' directory and run ''ant''. This is for construct the USB support for java. 
 +
 +In my case, this command failed. The problem was in the ''build.xml'' file located in NXJ_HOME/build/libnxt. I've reconstructed the compiler command: 
 +
 +<code shell>
 +gcc -Wall -std=gnu99 -fPIC main_jlibnxt.c
 +</code>
 +
 +
 +And it fails with this error: 
 +
 +<code>
 +main_jlibnxt.c:28:17: fatal error: usb.h: No such file or directory
 +</code> 
 +
 +**Solution:**
 +
 +    - Locate the usb.h file in your filesystem: ''find / -iname usb.h 2>/dev/null'': in my system this appears in ''/usr/include/usb.h''
 +
 +I've fixed the solution executing the ''make'' command and then:
 +
 +<code shell>
 +$ cd NXJ_HOME/build
 +$ ant
 +</code>
 +
 +
  
  
linux/legomindstorms.txt · Last modified: 2022/12/02 22:02 by 127.0.0.1