boot.py


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import usb_cdc
usb_cdc.enable(data=True)

import layout
import storage
if layout.check_key():
    print("Key pressed")
    storage.remount("/", readonly=False)
    storage.enable_usb_drive()
else:
    # Remount in read only
    storage.remount("/", readonly=True)
    storage.disable_usb_drive()