RE: The bluetooth can not be connected.

JunLiu — Sat, 28 Jun 2025 07:00:06 GMT

Hi,

As your advice, I modified MPSL_HFCLK_LATENCY to 1400, the bluetooth of the PCB can be connected.

Thank you.

Jun

RE: The bluetooth can not be connected.

Kenneth — Fri, 27 Jun 2025 17:29:37 GMT

Hi,

I suspect it's due to CONFIG_MPSL_HFCLK_LATENCY is set to a too short value.

We are in process of updating the value from 854 (think that was the default in older ncs releases) to a higher value (1400 I believe will be the new default value). Please see preliminary release notes and kconfig option:

https://docs.nordicsemi.com/bundle/ncs-latest/page/nrf/releases_and_maturity/releases/release-notes-3.1.0-preview2.html#developing_with_nrf54l_series

https://docs.nordicsemi.com/bundle/ncs-latest/page/kconfig/index.html#CONFIG_MPSL_HFCLK_LATENCY

In older ncs releases this value is not configurable, in that case you need to manually edit /subsys/mpsl/init/Kconfig and for instance change to:

config MPSL_HFCLK_LATENCY
int
default 1400 if SOC_SERIES_NRF54LX

Kenneth