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// display clock on single led
// return: SHORT - display, EMPTY - end
u08 DisplayClock(void)
{
  static u08 led_timer;
  static u08 i;

  if (!led_timer) {
    #if MONTH_WO_ZERO
    if (!i && clock[MONTH] / 10 == 0)
      i++;
    #endif
    Display(i & 1 ? clock[i / 2] % 10 : clock[i / 2] / 10);
  }
  if (++led_timer == ms2sys(LED_ON_TIME))
    LED_OFF();
  if (led_timer >= ms2sys(LED_ON_TIME + LED_OFF_TIME)) {
    led_timer = 0;
    if (++i >= sizeof(clock) * 2) {
      i = 0;
      return EMPTY;
    }
  }
  return SHORT;
}