FatFs/SDMMC with 4 wires times out, 1 wire works
I'm still trying to get FatFs to work with 4 wires. My PCB has been properly traced, each line is within a few mm of all others, and has a 33K pull-up. Internal pull-ups are off.This setup works fine at full-speed (45 MHz) when using only 1 wire, b...