80278e45aa
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@17442 a1c6a512-1295-4272-9138-f99709370657
112 lines
3.8 KiB
C
112 lines
3.8 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) 2006 by Linus Nielsen Feltzing
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*
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* All files in this archive are subject to the GNU General Public License.
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* See the file COPYING in the source tree root for full license agreement.
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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 "system.h"
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#include "backlight.h"
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#include "mc13783.h"
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#include "backlight-target.h"
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#ifdef HAVE_BACKLIGHT_BRIGHTNESS
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/* Table that uses combinations of current level and pwm fraction to get
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* as many uniquely-visible brightness levels as possible. The lowest current
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* level for any average current is used even though many combinations give
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* duplicate values. Current (I) values are in mA. */
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static const struct
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{
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unsigned char md;
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unsigned char pwm;
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} led_md_pwm_table[] =
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{
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/* I-level PWM(x/15) I-Avg */
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{ 0, 0 }, /* 0 0 0.0 */
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{ 1, 1 }, /* 3 1 0.2 */
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{ 1, 2 }, /* 3 2 0.4 */
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{ 1, 3 }, /* 3 3 0.6 */
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{ 1, 4 }, /* 3 4 0.8 */
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{ 1, 5 }, /* 3 5 1.0 */
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{ 1, 6 }, /* 3 6 1.2 */
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{ 1, 7 }, /* 3 7 1.4 */
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{ 1, 8 }, /* 3 8 1.6 */
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{ 1, 9 }, /* 3 9 1.8 */
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{ 1, 10 }, /* 3 10 2.0 */
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{ 1, 11 }, /* 3 11 2.2 */
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{ 1, 12 }, /* 3 12 2.4 */ /* default */
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{ 1, 13 }, /* 3 13 2.6 */
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{ 1, 14 }, /* 3 14 2.8 */
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{ 1, 15 }, /* 3 15 3.0 */
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{ 2, 9 }, /* 6 9 3.6 */
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{ 2, 10 }, /* 6 10 4.0 */
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{ 2, 11 }, /* 6 11 4.4 */
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{ 2, 12 }, /* 6 12 4.8 */
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{ 2, 13 }, /* 6 13 5.2 */
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{ 2, 14 }, /* 6 14 5.6 */
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{ 2, 15 }, /* 6 15 6.0 */
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{ 3, 11 }, /* 9 11 6.6 */
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{ 3, 12 }, /* 9 12 7.2 */
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/* Anything higher is just too much */
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};
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#endif /* HAVE_BACKLIGHT_BRIGHTNESS */
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bool _backlight_init(void)
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{
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mc13783_write(MC13783_LED_CONTROL0,
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MC13783_LEDEN |
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MC13783_LEDMDRAMPUP |
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MC13783_LEDMDRAMPDOWN |
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MC13783_BOOSTEN |
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MC13783_ABMODE_MONCH_LEDMD1234 |
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MC13783_ABREF_400MV);
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return true;
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}
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void _backlight_on(void)
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{
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/* LEDEN=1 */
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mc13783_set(MC13783_LED_CONTROL0, MC13783_LEDEN);
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}
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void _backlight_off(void)
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{
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/* LEDEN=0 */
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mc13783_clear(MC13783_LED_CONTROL0, MC13783_LEDEN);
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}
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#ifdef HAVE_BACKLIGHT_BRIGHTNESS
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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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uint32_t data, md, pwm;
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if ((unsigned)brightness >= ARRAYLEN(led_md_pwm_table))
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brightness = DEFAULT_BRIGHTNESS_SETTING;
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data = mc13783_read(MC13783_LED_CONTROL2);
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if (data == (uint32_t)-1)
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return;
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md = led_md_pwm_table[brightness].md;
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pwm = led_md_pwm_table[brightness].pwm;
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data &= ~(MC13783_LEDMD | MC13783_LEDMDDC);
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data |= MC13783_LEDMDw(md) | MC13783_LEDMDDCw(pwm);
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mc13783_write(MC13783_LED_CONTROL2, data);
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}
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#endif /* HAVE_BACKLIGHT_BRIGHTNESS */
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