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CARDPUTER CircuitPython/boot.py

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+"""CircuitPython Essentials Storage logging boot.py file"""
+from sys import implementation
+import board
+import digitalio
+import storage
+
+# The PyDOS 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), PyDOS FS is ReadOnly")
+    else:
+        storage.remount("/", False)
+        print("Switch True (not grounded), PyDOS FS is ReadWrite")
+
+    switch.deinit()
+else:
+    print("If write access from the host is needed, enter the following PyDOS command:\nfs ro")
+    storage.remount("/", False )