import board
import busio
import digitalio

normal_led = digitalio.DigitalInOut(board.GP22)
alarm_led = digitalio.DigitalInOut(board.GP21)
normal_led.direction = digitalio.Direction.OUTPUT
alarm_led.direction = digitalio.Direction.OUTPUT

def flash_led(mode='normal'):
    if mode == 'normal':
        normal_led.value = True
        alarm_led.value = False
    else:
        normal_led.value = False
        alarm_led.value = True