RE: Questions about enabling external 32 MHz crystal (HFXO) on nRF54L15 custom board

Håkon Alseth — Mon, 20 Oct 2025 13:59:54 GMT

Hi,

[quote user=""]1. Is nrf_clock_is_running() a reliable API on nRF54L15 for checking the actual clock source?[/quote]

This will (eventually, when translated through the nrf_clock API) return the register XO.STAT:

So, yes that is reliable and portable between the different nRF5x SoC's.

[quote user=""]2. How can I enable the 32 MHz external crystal instead of using the internal RC oscillator on the nrf54l15.[/quote]

If you want to use the clock control subsys, here's an implementation you can look at:

Kind regards,

Håkon