RE: I am trying to use 4 pairs of I2C on nRF5340, why is one behaving differently?

Yoshihiro Goto — Thu, 10 Oct 2024 07:53:52 GMT

Hello,

My apologies, I completely forgot that P0.0 and P0.1 were assigned different functions.
I changed the pin as you advised and it worked fine. Thank you very much.

Best Regards,
Yoshihiro Goto

RE: I am trying to use 4 pairs of I2C on nRF5340, why is one behaving differently?

Simonr — Wed, 09 Oct 2024 13:23:32 GMT

Hi Yoshihiro

This seemed very strange at first, but I think this could be related to the pins you've chosen for the I2C0 instance, as these by default are used by the 32.768kHz crystal and thus might behave a bit differently. I can't see in your project that you've set the nRF53 to use the internal RC oscillator instead of the external LF crystal which is the default by setting CONFIG_CLOCK_CONTROL_NRF_K32SRC_RC=y

If you have, and I've just missed it, I would either way try using some other GPIOs than P0.00 and P0.01 as the I2C0 GPIOs to check if the same behavior is seen on any pins or just these two.

Best regards,

Simon