sdioio uses SDIO high-speed interface to communicate with SD cards, it is not pin compatible with SPI and requires special wiring. Not all chips support SDIO, and if they do, you usually have to use special pins! It also requires CircuitPython 6.0.
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.
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)
storage.mount(vfs, "/sd")
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