>>Is there any good any tutorial or examples on the interfacing of STM32 and I/O cards?
Bunch of schematics of working designs on EVAL and other DISCO boards.
Bunch of working code examples under HAL/Cube trees, review?
Got familiarity with the Card Specs, work through the SDIO or SD-MMC examples and understand what's going on.
Would imagine modes of operation might limited, but backward compatible.
Use DMA, polled operation is marginal and prone to break with bus/interrupt loading.
