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Don't enable the current sink for the Clip Zip backlight until its actually needed.

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Patch by Mihail Zenkov who measured a modest increase in power consumption with
the current sink enabled.

Change-Id: Ib1c1639318de35d449ca51a9bd480005cb6a2ee0
Reviewed-on: http://gerrit.rockbox.org/989
Reviewed-by: Michael Giacomelli <giac2000@hotmail.com>
Tested: Michael Giacomelli <giac2000@hotmail.com>
This commit is contained in:
Mihail Zenkov 2014-09-28 00:26:29 +02:00 • committed by Michael Giacomelli
parent 02414bf286
commit 23dc0b0179
1 changed files with 4 additions and 5 deletions
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9
firmware/target/arm/as3525/sansa-clipzip/backlight-clipzip.c
View file

@ -29,16 +29,14 @@
bool _backlight_init()
{
/* GPIO B1 controls backlight */
GPIOB_DIR |= (1 << 1);
ascodec_write_pmu(AS3543_BACKLIGHT, 1, 0x91);
GPIOB_PIN(1) = (1 << 1);
return true;
}
void _backlight_on(void)
{
/* GPIO B1 controls backlight */
GPIOB_DIR |= (1 << 1);
ascodec_write_pmu(AS3543_BACKLIGHT, 1, 0x90);
GPIOB_PIN(1) = (1 << 1);
#ifdef HAVE_LCD_ENABLE
lcd_enable(true);
@ -50,6 +48,7 @@ void _backlight_off(void)
#ifdef HAVE_LCD_ENABLE
lcd_enable(false);
#endif
ascodec_write_pmu(AS3543_BACKLIGHT, 1, 0);
GPIOB_PIN(1) = 0;
}