Generic CircuitPython boot.py with additional notes for QT Py 2040

boot.py

# CircuitPython boot.py crib sheet
#  https://gist.github.com/Mark-Booth/6dd637fc65c03a0ede393a8c718b02c1

# Version history (most recent at top)
#  Add details of how to enter safe mode on the QT Py 2040
#  Initial commit & commit with link back to gist

# Based on the Adafruit Customizing USB Devices in CircuitPython page
#  https://learn.adafruit.com/customizing-usb-devices-in-circuitpython/circuitpy-midi-serial

# If things aren't working as expected, check the Adafruit troubleshooting page
#  https://learn.adafruit.com/adafruit-neokey-trinkey/troubleshooting

# Once configured, delete comments to save space.

import usb_hid

# These are the default HID devices
#usb_hid.enable((
#    usb_hid.Device.KEYBOARD,
#    usb_hid.Device.CONSUMER_CONTROL,
#    usb_hid.Device.MOUSE,
#))
# You don't need to write this explicitly if you want these default HID devices

#usb_hid.enable((usb_hid.Device.KEYBOARD,)) # Enable just KEYBOARD
#usb_hid.enable(()) # Disable all HID devices
#usb_hid.disable()  # Another way to disable all the devices

import usb_midi

#usb_midi.enable() # Default
#usb_midi.disable()

import usb_cdc

#usb_cdc.enable(console=True, data=False) # Default, enable just the REPL console
#usb_cdc.enable(console=True, data=True) # Enable console and data
#usb_cdc.enable(console=False, data=False)  # Disable both serial devices.
#usb_cdc.disable() # Another way to disable both devices Disable

import storage # Only disable storage after configuring other devices

# Once storage is disabled or made read-only, you will need to boot into safe
# mode to change boot options, such as re-enabling strage or making it writeable

#storage.disable_usb_drive()
#storage.enable_usb_drive() # Default, storage mounted on PC

# By default, storage is writable by PC but not by CircuitPython
# If you make storage writable by CircuitPython, it becomes readonly on the PC

#storage.remount("/", readonly=False)
#storage.remount("/", readonly=True) # Default, writeable by PC

# To use a switch to determine remount options for some common devices, see
#  https://learn.adafruit.com/circuitpython-essentials/circuitpython-storage
# For the QT Py RP2040, the Boot switch is on GPIO21, aka board.Button, but this
# doesn't appear to work for this purpose.

# To enter safe mode on the QT Py 2040, press the reset button twice, like a
# slow double tap, but you have to learn the cadence to do it reliably
# * If you double tap too quickly, it may enter bootloader mode, as if you had
#   held the boot button down while preessing reset
# * If you double tap too slowly, the QT Py 2040 will just reset twice