/// <summary>
/// Updates both the timers - if the sound timer reaches
/// 0 in this function, tells the display class to beep.
/// </summary>
private void UpdateTimers()
{
if (delay_timer > 0)
{
delay_timer--;
}
if (sound_timer > 0)
{
sound_timer--;
if (sound_timer == 0)
{
display.Beep();
}
}
}