BOARDS/CARDPUTER CircuitPython/boot.py

## FILE OBTAINED FROM: https://github.com/RetiredWizard/PyDOS/blob/main/cpython/boot.py
## BECAUSE ! I cannot find anyone else who explains boot.py clearly enough to work for the Cardputer and Circuitpython
## *specifically* for writing to the SD card!

## Minor edits made to comments and print statements for relevance to Cardputer generally

"""CircuitPython Essentials Storage logging boot.py file"""
from sys import implementation
import board
import digitalio
import storage

# The file system will be set to Read/Write status for next
# power cycle unless a control GPIO is grounded (GP2,5 or 6 depending on the Microcontroller)
# in which case the host computer will have Read/Write access and PyDOS will have readonly access.

if board.board_id == 'arduino_nano_rp2040_connect':
    swpin = board.D2
elif board.board_id in ['raspberry_pi_pico','cytron_maker_pi_rp2040']:
    swpin = board.GP6
elif board.board_id == 'adafruit_qtpy_esp32c3':
    swpin = board.A1
elif board.board_id == 'adafruit_itsybitsy_rp2040':
    swpin = board.D7
else:
    if "D5" in dir(board):
        swpin = board.D5
    elif "GP5" in dir(board):
        swpin = board.GP5
    elif "IO5" in dir(board):
        swpin = board.IO5
    elif "D6" in dir(board):
        swpin = board.D6
    elif "GP6" in dir(board):
        swpin = board.GP6
    elif "IO6" in dir(board):
        swpin = board.IO6
    elif "D2" in dir(board):
        swpin = board.D2
    elif "GP2" in dir(board):
        swpin = board.GP2
    elif "IO2" in dir(board):
        swpin = board.IO2
    else:
        swpin = None

if swpin:
    switch = digitalio.DigitalInOut(swpin)
    switch.direction = digitalio.Direction.INPUT
    switch.pull = digitalio.Pull.UP

# If the switch pin is connected to ground (switch.value == False) allow host to write to the drive
    if switch.value == False:
        # Mounts so Host computer can write to micro-flash
        storage.remount("/", True)
        print("Switch False (pin grounded), FS is ReadOnly")
    else:
        storage.remount("/", False)
        print("Switch True (not grounded), FS is ReadWrite")

    switch.deinit()
else:
    storage.remount("/", False )