bootloader - BLE Buttonless DFU App Crashes After Setting High on P0.27 and P1.07 – nRF52840 Custom Board (nRF5 SDK v16.0.1) - S

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I'm currently working on a custom board based on the nRF52840, using SoftDevice S140 v7.0.1 and nRF5 SDK v16.0.1. I’ve integrated the BLE Buttonless DFU example (examples/dfu/secure_bootloader/pca10056_ble) with my custom application code. However, I’m running into an issue that I can’t seem to debug effectively.

Problem: The DFU process completes successfully. I get the “App had been installed” log from the secure bootloader, but after that, the application never starts advertising. The bootloader debug session also crashes after the DFU process finishes. I receive no logs from the application itself, which makes it difficult to trace the issue.

After testing, I found that the issue is triggered only when I set the following GPIOs high:

P0.27

P1.07

These pins are set using nrf_gpio_pin_set() right before the main loop, after all application initialization is done.

When I comment out those two lines, the application starts broadcasting correctly and behaves as expected. I have also verified that the same firmware works fine without the Buttonless DFU template integration, even when setting those pins high.

Additional Context: Several other pins are initialized in a similar way and cause no issues.

I’ve disabled all BSP initialization across the project and double-checked included headers for anything that might initialize pins implicitly.

During secure bootloader setup, I changed the bootloader reset pin from P0.21 to P0.03 (as P0.21 is needed elsewhere). This change caused no problems and worked as expected.

The board is completely custom, and all peripheral hardware has been tested.

Questions: Are P0.27 or P1.07 used internally or reserved by the secure bootloader or BLE Buttonless DFU app in SDK v16.0.1?

Could setting these pins high during application startup affect SoftDevice operation or bootloader-to-app transition?

Any suggestions for how to further debug the application, especially since I get no logs from it?

I’d appreciate any advice or insight into this. Thank you!

Let me know if you'd like help checking the SDK sources for hidden usage of those pins or want to include relevant code snippets too.

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