Device tree conditional compile /west custom command

[carefree]

Hello:
In my project, I have the following requirements: I need to conditional compile the device tree, i.e., it needs to include a header file via #ifdef, but it can't conditional compile through autoconf.h generated by prj.conf (because the device tree compilation comes before the program compilation), how do I do it?

I tried to use the custom build command, which uses python code to identify the prj.conf file and output the required #define in the.h file included in the device tree before build, and then uses the build in ncs to conditionally compile the device tree.

I according to github.com/.../
Add yml and py files, but I can't find the new extension command using west -h in the console, now I have no way of knowing if I did something wrong. Or if there are new ways to solve the problem.

I knew that maybe I could create two device tree files and then add two build configurations. Still, I wonder if it is possible to control conditional compilation of the device tree via prj.conf.
Thanks!

[Simonr]

Hi

I think the adding your own code workflow section in the documentation should be helpful here. Additionally, if you're on NCS version v2.7.0 or later we've moved to Sysbuild, and here is the file suffix support available for Sysbuild. 

You can also check out the DevAcademy and the nRF Connect fundamentals and intermediate courses for a better understanding of how NCS projects and the environment altogether is set up.

Best regards,

Simon

[carefree]

Thanks! It is a little difficult for me to fully grasp it with my current personal ability. I will gradually understand it in the future practice.

[Simonr]

Then I urge you to check out the DevAcademy nRF Connect fundamentals, and in turn intermediate course to get a grasp of the nRF Connect SDK. After these you should have a better reference point to get started with developing on your own.

Best regards,
Simon