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Patch FS#5712 by Michael Sevakis - X5 Backlight brightness improvement/fix

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@10322 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Linus Nielsen Feltzing 2006-07-25 15:21:31 +00:00
parent 8bb4bab54b
commit f18f9a8061
6 changed files with 32 additions and 19 deletions
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20
firmware/backlight.c
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@ -659,28 +659,26 @@ bool is_remote_backlight_on(void) {return true;}
void backlight_set_brightness(int val)
{
#ifndef SIMULATOR
/* set H300 brightness by changing the PWM
accepts 0..15 but note that 0 and 1 give a black display! */
/* set brightness by changing the PWM
* accepts 0..15 but note that 0 and 1 give a black display on H300!
* 0 is black on the X5.
*/
/* disable IRQs while bitbanging */
int old_irq_level = set_irq_level(HIGHEST_IRQ_LEVEL);
val &= 0x0F;
/* Clamp setting to range */
if(val<MIN_BRIGHTNESS_SETTING)
val=MIN_BRIGHTNESS_SETTING;
else if(val>MAX_BRIGHTNESS_SETTING)
val=MAX_BRIGHTNESS_SETTING;
/* shift one bit left */
val <<= 1;
/* enable PWM */
val |= 0x01;
pcf50606_write(0x35, val);
pcf50606_write(0x35, (val << 1) | 0x01); /* 512Hz, Enable PWM */
/* enable IRQs again */
set_irq_level(old_irq_level);
#else
val=0;
val=0;
#endif
}
#endif