Title: How to Configure Build File for a Custom nRF52840 Breakout Board?

[Usha]

Body:

Hello Nordic Team and Community,

I am working on a project using an nRF52840 chip on a custom breakout board. I am not using any pre-made development boards or modules (e.g., no PCA10056, Raytac modules, etc.).

When building a project in the nRF Connect SDK or nRF5 SDK, the build files require selecting a board configuration (e.g., nrf52840dk_nrf52840 for the nRF52840 DK). Since I am using a custom breakout board with just the nRF52840 chip, I would like to know:

1. Which board configuration should I select as a base for my project?
2. How can I modify or create a custom board configuration for my breakout board?
3. What are the necessary files (e.g., device tree files, board definitions, etc.) I need to create or edit?
4. Do I need to set specific pin configurations or other hardware details in the build system?

I want to ensure the firmware works correctly for my custom setup, including GPIO mappings, peripherals, and debugging support.

Thank you for your guidance!

[Einar Thorsrud]

Hi,

To start with,  the simplest is often to pick the corresponding DK, and add overlay files for that describing the releavnt differences to your hardware. But ta some point you should make board files for your specifc board that you build for. This is desfribed in Lesson 3 – Adding custom board support in the nRF Connect SDK Intermediate course.