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Meizu M3: implement logarithmic brightness curve (curve provided by markun) and increase PWM frequency for the backlight.

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@21532 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Bertrik Sikken 2009-06-27 19:10:42 +00:00
parent 13d0b526c3
commit 660daa51d4
2 changed files with 7 additions and 5 deletions
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8
firmware/target/arm/s5l8700/backlight-meizu.c
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@ -58,6 +58,8 @@ void INT_TIMERA(void)
void _backlight_set_brightness(int brightness)
{
static const unsigned char logtable[] = {0, 1, 2, 3, 5, 7, 10, 15, 22, 31, 44, 63, 90, 127, 180, 255};
if (brightness == MIN_BRIGHTNESS_SETTING) {
/* turn backlight fully off and disable interrupt */
PDAT0 &= ~(1 << 2);
@ -70,7 +72,7 @@ void _backlight_set_brightness(int brightness)
}
else {
/* set PWM width and enable interrupt */
TADATA0 = brightness;
TADATA0 = logtable[brightness];
INTMSK |= (1 << 5);
}
}
@ -101,8 +103,8 @@ bool _backlight_init(void)
(1 << 11) | /* TA_START */
(3 << 8) | /* TA_CS = PCLK / 64 */
(1 << 4); /* TA_MODE_SEL = PWM mode */
TADATA1 = MAX_BRIGHTNESS_SETTING; /* set PWM period */
TAPRE = 100; /* prescaler */
TADATA1 = 255; /* set PWM period */
TAPRE = 30; /* prescaler */
_backlight_on();