The Adafruit Grand Central M4 Express supports SDIO mode with the SDIO Breakout Board. First, wire the two together as shown:
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To mount the SD card, use the following code. Remember to put it in the file mount_sd.py on CIRCUITPY so you can easily call it from code.py or the REPL with import mount_sd.
Download:
file
import board
import sdioio
import storage
sdcard = sdioio.SDCard(
clock=board.SDIO_CLOCK,
command=board.SDIO_COMMAND,
data=board.SDIO_DATA,
frequency=25000000)
vfs = storage.VfsFat(sdcard)
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