0e74f75deb
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@20707 a1c6a512-1295-4272-9138-f99709370657
51 lines
1.9 KiB
C
51 lines
1.9 KiB
C
/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id$
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*
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* Copyright (C) 2007 by Jens Arnold
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#ifndef BACKLIGHT_TARGET_H
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#define BACKLIGHT_TARGET_H
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#include "config.h"
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#include "rtc.h"
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#define _backlight_init() true
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static inline void _backlight_on(void)
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{
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rtc_write(0x13, 0x10); /* 32 kHz square wave */
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rtc_write(0x0a, rtc_read(0x0a) | 0x40); /* Enable square wave */
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}
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static inline void _backlight_off(void)
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{
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/* While on, backlight is flashing at 32 kHz. If the square wave output
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is disabled while the backlight is lit, it will become constantly lit,
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(brighter) and slowly fade. This resets the square wave counter and
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results in the unlit state */
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unsigned char rtc_0a = rtc_read(0x0a) & ~0x40;
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rtc_write(0x0a, rtc_0a); /* Disable square wave */
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rtc_write(0x13, 0xF0); /* 1 Hz square wave */
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rtc_write(0x0a, rtc_0a | 0x40); /* Enable square wave */
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/* When the square wave output is disabled in the unlit state,
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the backlight stays off */
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rtc_write(0x0a, rtc_0a);
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}
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#endif
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