firmware/export/backlight-sw-fading.h

   1 /***************************************************************************
   2  *             __________               __   ___.
   3  *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4  *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7  *                     \/            \/     \/    \/            \/
   8  * $Id$
   9  *
  10  * Copyright (C) 2008 by Thomas Martitz
  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
  22 #ifndef BACKLIGHT_SW_FADING_H
  23 #define BACKLIGHT_SW_FADING_H
  24
  25
  26 /* total fading time will be current brightness level * FADE_DELAY * 10ms */
  27 #if (MAX_BRIGHTNESS_SETTING >= 25)
  28 #define FADE_DELAY 2 /* =HZ/50 => 20ms */
  29 #elif (MAX_BRIGHTNESS_SETTING >= 16)
  30 #define FADE_DELAY 3 /* =HZ/33 => 30ms */
  31 #else
  32 #define FADE_DELAY 4 /* =HZ/25 => 40ms*/
  33 #endif
  34
  35
  36 void _backlight_fade_update_state(int brightness);
  37 bool _backlight_fade_step(int direction);
  38
  39 /* enum used for both, fading state and fading type selected through the settings */
  40
  41 enum {
  42     NOT_FADING = 0,
  43     FADING_UP,
  44     FADING_DOWN,
  45 };
  46
  47 #endif /* BACKLIGHT_SW_FADING_H */