Just to be sure, here is the wiring I'm using.

I'm getting the same error when trying 1-line setup. But again this might be problem of the adapter itself. I'll get myself a "naked" SD breakout board and try again. Thanks!

Yet another SDIO topic... I'm trying to run microSD card with sd_card_example_main . Have tried both: SPI and Bit1 modes, but lets start with SPI to keep things simple. So, what I got: 1) Shield Module SPI Micro SD Adapter For Arduino , successfully tested with Arduino Nano with SPI. 2) Wiring: GPIO...