RE: NCS on-demand LFCLK calibration

ovrebekk — Tue, 11 Jun 2024 13:39:58 GMT

Glad I could help Graham 🙂

RE: NCS on-demand LFCLK calibration

grahamm — Tue, 11 Jun 2024 13:18:08 GMT

Thanks Torbjørn, this is the guidance I needed!

RE: NCS on-demand LFCLK calibration

ovrebekk — Tue, 11 Jun 2024 11:07:50 GMT

Hi Graham

What you are seeing here is the LF clock calibration, yes. It seems the calibration is running continuously, regardless of any activity in the SoftDevice controller (SDC), as the clock calibration is handled by the MPSL module and not the SDC.

There is no official way to change this behavior unfortunately, but the code controlling the calibration is available in the MPSL source files, and you could change this yourself if you want to.

Essentially all you have to do is to comment out this line, to avoid the calibration task being triggered repeatedly.

Then you need to call the mpsl_calibration_timer_handle() function manually, which allows you to call it whenever you want. Just make sure that you call it often enough when a Bluetooth connection is active.

Best regards
Torbjørn