If I use a Teensy 3.5, the SPI microSD card is found and I'm able to read the files on it. With a Teensy 3.2, SD.begin(9) returns 0. I've tried using pin 10 for CS with the same results.
p.s. I would switch to Teensy 4.1, but the code is using the TeensyStep library which isn't compatible with the 4.1.
p.s. I would switch to Teensy 4.1, but the code is using the TeensyStep library which isn't compatible with the 4.1.