RTEMS (Real-Time Executive for Multiprocessor Systems) is a real-time operating system kernel used around the world and in space. RTEMS is a free real-time operating system (RTOS) designed for deeply embedded systems such as automobile electronics, robotic controllers, and on-board satellite instruments (1,2).

This example is the result of a study of this OS. I was interested in learning how to build an image and create applications for it. In addition, I wanted to develop my own user-friendly command-line interface for managing and debugging a device based on the LPC1768 microcontroller.

Perhaps this work will be interesting to someone and you will use this knowledge to create your own systems.

Use the help to find out all the available options:

(ubuntu-user)$ ./build.sh -h
Use ./build.sh [OPTIONS...]
    -a Build all: cross-compiler, RTEMS OS and ile-cli application
    -c Clear all
    -r Delete the application's object files before building it
    -h Print help

For the first build, use the build script with the -a option to build all the tools and RTEMS object files. This will be located in the ./rtems-rtos folder.

(user)$ ./build.sh -a

Use scripts with the name xxxxx-docker.sh to run in the docker container.

(user)$ ./build-docker.sh -h

Build the application only, without rebuilding tools and RTEMS OS:

(ubuntu-user)$ ./build.sh

The Waf build system (3,4) is used for the output executable file of the application.

Test the result in QEMU using the script:

(user)$ ./run.sh