A basic 2x2 matrix that can auto-flash to a Feather with a compatible bootloader

kmk/circuitpython/util.py

@@ -0,0 +1,22 @@
+import board
+import digitalio
+import time
+import sys
+
+
+def feather_signal_error_with_led_flash(rate=0.5):
+    '''
+    Flash the red LED for 10 seconds, alternating every $rate
+    Could be useful as an uncaught exception handler later on,
+    but is for now unused
+    '''
+
+    rled = digitalio.DigitalInOut(board.LED1)
+    rled.direction = digitalio.Direction.OUTPUT
+
+    # blink for 5 seconds and exit
+    for cycle in range(10):
+        rled.value = cycle % 2
+        time.sleep(rate)
+
+    sys.exit(1)