try reading at 400Khz if your speed change is wrong she will baulk and don't forget destination buffer must be 4 byte aligned.

Can you explain why the destination buffer needs to be 4 byte aligned?

Hi, I'm trying to write an SD card driver for my Raspberry Pi 3B+. I'm always getting a CRC error when I issue a single block read command (CMD17) to the SD card (I haven't tried multiblock read or writes yet. I want to get the single block read down first). For the card initialization process, I re...