RE: BLE Communication Fails on Custom Board Without 32kHz XTAL – NCS v2.9

Karim_Os — Mon, 14 Apr 2025 05:45:10 GMT

Hi Kenneth,
Thanks for the reply
Setting CONFIG_MPSL_HFCLK_LATENCY=1400
Worked!

RE: BLE Communication Fails on Custom Board Without 32kHz XTAL – NCS v2.9

Kenneth — Mon, 07 Apr 2025 12:52:23 GMT

Hello,

Can you provide detailed chip markings printed on top of the nRF54L15 you have?

I assume you are only programming the application here, and don't have for instance mcuboot or other images programmed? (If you do, then you also need to choose the RC clock for those images.)

In the board file you can also remove the lfxo like this:

/ {
clocks {
/delete-node/ lfxo;
};
};

Also, since you have other issues, can you try to set CONFIG_MPSL_HFCLK_LATENCY=1400? To make it possible to modify you need to add this change: https://github.com/nrfconnect/sdk-nrf/commit/68623068aed6482998f1eff6df828b051c7bb48f

Finally, do make sure you run radio test or direct test mode to confirm the hfxo meet the electrical performance required by the radio.

Kenneth