def flash_casu(casu):
    """
    Flash the CASU led to allow synchronisation between video data and CASU logs.
    :type casu: assisipy.casu.Casu
    """
    for _ in range(__NUMBER_FLASHES - 1):
        casu.set_diagnostic_led_rgb(r=1)
        time.sleep(__FLASH_LENGTH)
        casu.diagnostic_led_standby()
        time.sleep(__FLASH_LENGTH)
    casu.set_diagnostic_led_rgb(r=1)
    time.sleep(__FLASH_LENGTH)
    casu.diagnostic_led_standby()
def flash_led(casu):
    casu.set_diagnostic_led_rgb(r=1, g=0, b=0)
    time.sleep(LED_DURATION)
    casu.set_diagnostic_led_rgb(0, 0, 0)