On unhandled exceptions, blink the feather LED repeatedly

kmk/circuitpython/util.py

@@ -1,23 +1,17 @@
-import sys
 import time
 
 import board
 import digitalio
 
 
-def feather_signal_error_with_led_flash(rate=0.5):
+def feather_red_led_flash(duration=10, 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
+    Flash the red LED for $duration seconds, alternating every $rate
     '''
 
     rled = digitalio.DigitalInOut(board.LED1)
     rled.direction = digitalio.Direction.OUTPUT
 
-    # blink for 5 seconds and exit
-    for cycle in range(10):
+    for cycle in range(duration / rate):
         rled.value = cycle % 2
         time.sleep(rate)
-
-    sys.exit(1)