94 lines
2.4 KiB
C
94 lines
2.4 KiB
C
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/***************************************************************************
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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) 2011 by Tomasz Moń
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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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#include "config.h"
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#include "cpu.h"
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#include "system.h"
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#include "backlight-target.h"
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#include "backlight.h"
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#include "lcd.h"
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#include "power.h"
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#include "spi-target.h"
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#include "lcd-target.h"
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static void _backlight_write_brightness(int brightness)
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{
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/*
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Maps brightness int to percentage value found in OF
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OF PWM1H
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5% 14
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10% 140
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15% 210
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20% 280
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...
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95% 1330
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100% 1400
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*/
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if (brightness > 20)
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brightness = 20;
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else if (brightness < 0)
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brightness = 0;
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IO_CLK_PWM1H = brightness*70;
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}
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void _backlight_on(void)
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{
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/* set GIO34 as PWM1 */
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IO_GIO_FSEL3 = (IO_GIO_FSEL3 & 0xFFF3) | (1 << 2);
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#if (CONFIG_BACKLIGHT_FADING == BACKLIGHT_NO_FADING)
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_backlight_write_brightness(backlight_brightness);
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#endif
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}
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void _backlight_off(void)
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{
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_backlight_write_brightness(0);
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bitclr16(&IO_GIO_FSEL3, 0xC); /* set GIO34 to normal GIO */
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bitclr16(&IO_GIO_INV2, (1 << 2)); /* make sure GIO34 is not inverted */
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IO_GIO_BITCLR2 = (1 << 2); /* drive GIO34 low */
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}
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/* Assumes that the backlight has been initialized */
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void _backlight_set_brightness(int brightness)
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{
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_backlight_write_brightness(brightness);
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}
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void __backlight_dim(bool dim_now)
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{
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_backlight_set_brightness(dim_now ?
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DEFAULT_BRIGHTNESS_SETTING :
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DEFAULT_DIMNESS_SETTING);
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}
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bool _backlight_init(void)
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{
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IO_CLK_PWM1C = 0x58D; /* as found in OF */
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_backlight_set_brightness(backlight_brightness);
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return true;
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}
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