Hello Nordic Team,
I’m currently developing a BLE ranging device using the u-blox NORA-B126 module, which integrates an nRF5340 SoC and a Skyworks SKY66112-11 FEM.
I’m encountering an issue when running the distance measurement (DM) example. The symptoms are as follows:
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When the FEM is properly configured, the distance measurement example does not perform any ranging measurements, it appears idle with no error messages.
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When the FEM configuration is removed, the example runs for around 5 minutes before halting unexpectedly.
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The FEM appears to function correctly by the way; for instance, it yields a notable -23 dB improvement when tested with the LBS (LED Button Service) example, which suggests proper PA/LNA operation.
We are configuring the FEM as described in the NORA-B1 System Integration Manual, starting from page 19, with GPIO forwarding and MPSL settings in the board support package, following NCS v2.0+ guidance.
I’m using the DM example without any code modifications, except enabling the FEM as per documentation. It’s unclear if the DM stack has built-in support or limitations when used with MPSL FEM routing. If any diagnostic tools or debug flags could help trace radio state transitions or FEM behavior, I’m open to suggestions.
Questions:
1. Is the Distance Measurement (DM) example compatible with the use of a FEM (e.g., SKY66112-11)?
2. If so, are there additional or missing FEM configuration steps (e.g., GPIO forwarding, MPSL FEM driver setup, Kconfig, DTS, etc.) that are required for the DM example to function correctly with a FEM on the nRF5340/NORA-B126 platform?
Thanks in advance for your support!
1856.NORA-B1_SIM_UBX-20027617.pdf
