RE: Device Tree Magic Macros

Hieu — Wed, 30 Aug 2023 14:29:53 GMT

Hi Jerry,

Thank you for the kind words. It's good to know I was able to help 🙂

Regards,

Hieu

Jerry Easley — Wed, 30 Aug 2023 13:17:19 GMT

Hi Hieu,

Your response is very helpful; thank you so much!

Regards,

Jerry

Hieu — Mon, 28 Aug 2023 11:51:21 GMT

Hi Jerry,

[quote user=""]My intuition is to run the compiler with -E flag set but I can't figure out how to do that under vscode/nrf_sdk.[/quote]

Trying to expand the macro like Patrick said is an option. I could not get it to work like they said, but hover the mouse over the macro gives me its expanded form. I searched further and can replace it inline using the IDE with the method described here: https://github.com/microsoft/vscode-cpptools/issues/4183#issuecomment-865443907.

However, my understanding is that you want to understand how the macros are expanded. If so, you will want to look into these resources:

Devicetree access from C/C++ — Zephyr Project documentation (nRF Connect SDK) (nordicsemi.com)
You might want to get a general idea of the terms used from this page.
It's also a good idea to understand the the relevant concepts from the parent page here: Devicetree — Zephyr Project documentation (nRF Connect SDK) (nordicsemi.com)
The macros are defined in https://github.com/nrfconnect/sdk-zephyr/blob/v3.3.99-ncs1/include/zephyr/devicetree.h
The header file where all the Devicetree nodes are compiled and generated is <build directory>/zephyr/include/generated/devicetree_generated.h

Regards,

Hieu

Patrick — Sat, 26 Aug 2023 22:42:43 GMT

In VSCode, when you right click a macro, click refactor, then "Expand Macro". This will show you what code that macro has generated.