sd card problem / GPIO drive

[Michal]

Hello,

I have a problem with communicating with SD cards (https://devzone.nordicsemi.com/f/nordic-q-a/34401/fatfs-example-does-not-work-with-every-sd-card). I resloved partially my problems with configuring SCK and MOSI lines to H0H1. But I still have problems with some of SD cards. Is it possible that nrf gpios drive is not "strong" enough to properly control SPI lines? Or may it be that current peak caused by SD card have introduced some noise to power lines and to SPI lines?

I tried resolving this problem at software level but no configuration is helping.

I am testing on standard fatfs example from sdk 15.2.

Regards,

Michał

[hmolesworth]

/CS should probably be H0H1 as well (its not mentioned above) ..

[Michal]

Thank you :) I tried applying H0H1 to all lines but did not get better result in compare to what you proposed in previous thread.