LeJOSUnit is a port of the Java based JUnit framework for testing robotic programs with a very small footprint. LeJOS is a Java based replacement firmware (OS) for the LEGO Mindstorms RCX brick that comes with Lego 's Robotics Invention System. Unofficial Mindstorms Software and Macintosh. Numerous alternatives for programming the RCX have been created independent of Lego. This page provides some guidelines for using a few of the more common alternatives on a Macintosh.

#LEGO Mindstorms RCX on OS X

After a lot of research on the web, I found it was a pain in the ass to communicate with the RCX on a MacBook Pro running OS X Mavericks.

By now, the only (and best) solution is to use NQC.

NQC is a programming language with a syntax similar to C but it's Not Quite C.

For more information and documentation: http://bricxcc.sourceforge.net/nqc/

NQC is provided as a simple command line program which acts as a compiler and a tool to communicate with your RCX hardware to transmit firmware and programs.

Follow these simple steps and you'll be able to enjoy programming your old RCX brick on a modern Intel Mac.

The only requirement is a Serial to USB adapter to connect the IR Tower to your computer.
Find a cheap one based on the PL2303 chip and install the kernel extension:
http://www.xbsd.nl/2011/07/pl2303-serial-usb-on-osx-lion.html

(I don't know if NQC works with the USB IR Tower on OS X since I only have the serial version)

##1) Building NQC from sources

For the lazy ones, I also provide a compiled version inside the /binaries folder.
(If you want to use it, copy the nqc executable inside your /usr/local/bin directory and go directly to step 2)

If the build succeeds, the nqc executable will be installed globally.

##2) Uploading the official LEGO firmware

Find the name of your serial port:

This command will return a list of available devices. Look for something like '/dev/cu.PL2303-XXXX' and write it down.

I provide 3 LEGO firmware in this repository:

Downloader For Mac

firm0309.lgo: RCX firmware version 3.09 - Provided with RCX 1.0 & 1.5
firm0328.lgo: RCX firmware version 3.28 - Provided with RCX 2.0
firm0332.lgo: RCX firmware version 3.32 - Latest firmware (Not sure if this one is compatible with NQC)

We will use firm0328.lgo for now.

Send it to your brick:

This will take a few minutes.

##3) Send a test program to the RCX

Lego Download For Pc

I provide some example programs (from the NQC website) in the /examples folder

Upload the music.nqc program with this command:

When the transfer is complete, you can test it on your brick by selecting program slot 1 and running it

For more informations on the NQC utility, please refer to the official manual:
http://bricxcc.sourceforge.net/nqc/doc/NQC_Manual.pdf

Lego Rcx Windows 10

For the NQC syntax reference:
http://bricxcc.sourceforge.net/nqc/doc/NQC_Guide.pdf