SPI clock-frequency not allowed to go to 125kHz in

RE: SPI clock-frequency not allowed to go to 125kHz in

Simonr — Mon, 01 Dec 2025 10:10:48 GMT

I'm sorry, but this has been down-prioritized on our side and we have not yet come to a resolution in the internal ticket.

For your issue. Error message -5 points to an EIO (input/output error), so the spi_write_dt() is not able to write as it has input/output errors.

Best regards,

Simon

RE: SPI clock-frequency not allowed to go to 125kHz in

arey — Fri, 28 Nov 2025 07:01:29 GMT

Hi,

I also try to use SPI on a NRF54L15-DK with a frequency below 200kHz. I use the SPI as a workaround that prevents me from doing bit-banging to configure a microphone. But the microphone need to have a clock between 50 to 200kHz. By configuring the spi-max-frequency to 200kHz or lower, I also get the following error :

spi_write_dt() failed, err: -5

I would like to know if your internal investigation yielded any results and if there was a solution to this problem.

Thank's

arey

RE: SPI clock-frequency not allowed to go to 125kHz in

Simonr — Mon, 20 Jan 2025 12:34:26 GMT

We are aware of this and have an internal investigation ongoing on this. We're seeing this whenever setting the SPI frequency lower than 1MHz. For now, using frequencies between 1MHz and 4MHz should be fine. I'll let you know if the internal ticket comes to some resolution any time soon. Is there a specific reason you need the device to run at 125kHz?

Best regards,

Simon