firmware/drivers/led.c

   1 /***************************************************************************
   2  *             __________               __   ___.
   3  *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4  *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7  *                     \/            \/     \/    \/            \/
   8  * $Id$
   9  *
  10  * Copyright (C) 2002 by Alan Korr
  11  *
  12  * This program is free software; you can redistribute it and/or
  13  * modify it under the terms of the GNU General Public License
  14  * as published by the Free Software Foundation; either version 2
  15  * of the License, or (at your option) any later version.
  16  *
  17  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  18  * KIND, either express or implied.
  19  *
  20  ****************************************************************************/
  21 #include "config.h"
  22 #include <stdbool.h>
  23 #include "cpu.h"
  24 #include "led.h"
  25 #include "system.h"
  26 #include "kernel.h"
  27
  28 #if (CONFIG_LED == LED_REAL)
  29
  30 void led(bool on)
  31 {
  32     if ( on )
  33     {
  34         or_b(0x40, &PBDRL);
  35     }
  36     else
  37     {
  38         and_b(~0x40, &PBDRL);
  39     }
  40 }
  41
  42 #elif (CONFIG_LED == LED_VIRTUAL) || defined(HAVE_REMOTE_LCD)
  43
  44 static bool current;
  45 static long last_on; /* timestamp of switching off */
  46
  47 void led(bool on)
  48 {
  49     if (current && !on) /* switching off */
  50     {
  51         last_on = current_tick; /* remember for off delay */
  52     }
  53     current = on;
  54 }
  55
  56 bool led_read(int delayticks) /* read by status bar update */
  57 {
  58     /* reading "off" is delayed by user-supplied monoflop value */
  59     return (current || TIME_BEFORE(current_tick, last_on+delayticks));
  60 }
  61
  62 #else
  63
  64 void led(bool on)
  65 {
  66     (void)on;
  67 }
  68 #endif /* CONFIG_LED, HAVE_REMOTE_LCD */