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rk27xx - fix backlight driver - now one can set brightness

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@30138 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Marcin Bukat 2011-07-14 17:06:44 +00:00
parent 302c0b7484
commit cad91ed938
2 changed files with 24 additions and 15 deletions
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7
firmware/export/config/rk27generic.h
View file

@ -113,9 +113,12 @@
/* Define this for LCD backlight available */
#define HAVE_BACKLIGHT
#define HAVE_BACKLIGHT_BRIGHTNESS
/* Doesn't work so comment it out for now */
/* #define HAVE_BACKLIGHT_BRIGHTNESS */
/* Main LCD backlight brightness range and defaults */
#define MIN_BRIGHTNESS_SETTING 0
#define MAX_BRIGHTNESS_SETTING 31
#define DEFAULT_BRIGHTNESS_SETTING 18
/* Define this if you have a software controlled poweroff */
#define HAVE_SW_POWEROFF

32
firmware/target/arm/rk27xx/backlight-rk27xx.c
View file

@ -25,6 +25,14 @@
#include "backlight-target.h"
#include "system.h"
static int brightness = DEFAULT_BRIGHTNESS_SETTING;
static const unsigned short log_brightness[] = {
0x2710, 0x27ac, 0x2849, 0x2983, 0x2abd, 0x2c93, 0x2e6a, 0x30dd,
0x3351, 0x3661, 0x3971, 0x3d1f, 0x40cc, 0x4516, 0x4960, 0x4e47,
0x532e, 0x58b1, 0x5e35, 0x6456, 0x6a76, 0x7134, 0x77f1, 0x7f4c,
0x86a6, 0x8e9d, 0x9695, 0x9f29, 0xa7bd, 0xb0ee, 0xba1f, 0xc350
};
bool _backlight_init(void)
{
/* configure PD4 as output */
@ -36,15 +44,18 @@ bool _backlight_init(void)
/* IOMUXB - set PWM0 pin as GPIO */
SCU_IOMUXB_CON &= ~(1 << 11); /* type<<11<<channel */
/* setup pwm */
/* DIV/2, PWM reset */
PWMT0_CTRL = (0<<9) | (1<<7);
/* set pwm frequency ~10kHz */
/* (apb_freq/pwm_freq)/pwm_div = (50 000 000/10 000)/2 */
PWMT0_LRC = 2500;
PWMT0_HRC = 1;
/* set pwm frequency to 500Hz - my lcd panel can't cope more reliably */
/* (apb_freq/pwm_freq)/pwm_div = (50 000 000/500)/2 */
PWMT0_LRC = 50000;
PWMT0_HRC = log_brightness[brightness];
/* reset counter */
PWMT0_CNTR = 0x00;
/* DIV/2, PWM output enable, PWM timer enable */
PWMT0_CTRL = (0<<9) | (1<<3) | (1<<0);
return true;
@ -58,11 +69,6 @@ void _backlight_on(void)
/* set output pin as PWM pin */
SCU_IOMUXB_CON |= (1<<11); /* type<<11<<channel */
/* 100% duty cycle. Other settings doesn't work for
* unknown reason
*/
PWMT0_HRC = PWMT0_LRC;
/* pwm enable */
PWMT0_CTRL |= (1<<3) | (1<<0);
}
@ -79,8 +85,8 @@ void _backlight_off(void)
SCU_CLKCFG |= (1<<29);
}
void _backlight_set_brightness(int brightness)
void _backlight_set_brightness(int val)
{
(void)brightness;
/* doesn't work for unknown reason */
brightness = val & 0x1f;
PWMT0_HRC = log_brightness[brightness];
}