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  * All files in this archive are subject to the GNU General Public License.
  13  * See the file COPYING in the source tree root for full license agreement.
  14  *
  15  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  16  * KIND, either express or implied.
  17  *
  18  ****************************************************************************/
  19 #include "config.h"
  20 #include <stdbool.h>
  21 #include "cpu.h"
  22 #include "led.h"
  23 #include "system.h"
  24 #include "kernel.h"
  25
  26 #if (CONFIG_LED == LED_REAL)
  27
  28 void led(bool on)
  29 {
  30     if ( on )
  31     {
  32         or_b(0x40, &PBDRL);
  33     }
  34     else
  35     {
  36         and_b(~0x40, &PBDRL);
  37     }
  38 }
  39
  40 #elif (CONFIG_LED == LED_VIRTUAL) || defined(HAVE_REMOTE_LCD)
  41
  42 static bool current;
  43 static long last_on; /* timestamp of switching off */
  44
  45 void led(bool on)
  46 {
  47     if (current && !on) /* switching off */
  48     {
  49         last_on = current_tick; /* remember for off delay */
  50     }
  51     current = on;
  52 }
  53
  54 bool led_read(int delayticks) /* read by status bar update */
  55 {
  56     /* reading "off" is delayed by user-supplied monoflop value */
  57     return (current || TIME_BEFORE(current_tick, last_on+delayticks));
  58 }
  59
  60 #else
  61
  62 void led(bool on)
  63 {
  64     (void)on;
  65 }
  66 #endif /* CONFIG_LED, HAVE_REMOTE_LCD */