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Implement PWM backlight driver for the Meizus. Update Meizu M3 bootloader to control brightness with the touch strip.

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@21478 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Bertrik Sikken 2009-06-23 18:11:03 +00:00
parent d86cf998e8
commit 743dcf7f69
8 changed files with 126 additions and 69 deletions
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5
bootloader/meizu_m3.c
View file

@ -43,7 +43,7 @@
#include "rbunicode.h"
#include "usb.h"
#include "qt1106.h"
#include "rockboxlogo.h"
#include "bitmaps/rockboxlogo.h"
#include <stdarg.h>
@ -128,6 +128,7 @@ void main(void)
EINTMSK = 0x11;
asm volatile("msr cpsr_c, #0x13\n\t"); // enable interrupts
backlight_init();
lcd_init();
lcd_update();
@ -157,6 +158,8 @@ void main(void)
if(slider & 0x008000)
bl_debug_count(((slider&0xff)) + 1);
*/
_backlight_set_brightness(slider & 0xFF);
}
//power off

1
firmware/SOURCES
View file

@ -1241,6 +1241,7 @@ target/arm/s5l8700/meizu-m6sp/lcd-m6sp.c
#endif /* MEIZU_M6SP */
#ifdef MEIZU_M3
target/arm/s5l8700/backlight-meizu.c
target/arm/s5l8700/meizu-m3/lcd-m3.c
drivers/qt1106.c
#ifndef SIMULATOR

7
firmware/export/config-meizu-m3.h
View file

@ -178,8 +178,7 @@
#define DEFAULT_CONTRAST_SETTING 19 /* Match boot contrast */
/* Main LCD backlight brightness range and defaults */
/* PCF50506 can output 0%-100% duty cycle but D305A expects %15-100%. */
#define MIN_BRIGHTNESS_SETTING 1 /* 15/16 (93.75%) */
#define MAX_BRIGHTNESS_SETTING 13 /* 3/16 (18.75%) */
#define DEFAULT_BRIGHTNESS_SETTING 8 /* 8/16 (50.00%) = x5 boot default */
#define MIN_BRIGHTNESS_SETTING 0
#define MAX_BRIGHTNESS_SETTING 255
#define DEFAULT_BRIGHTNESS_SETTING 200

111
firmware/target/arm/s5l8700/backlight-meizu.c Normal file
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@ -0,0 +1,111 @@
/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2009 by Bertrik Sikken
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
#include <stdbool.h>
#include "config.h"
#include "backlight.h"
#include "backlight-target.h"
#include "system.h"
/*
Interrupt-driven backlight driver using the PWM mode of a hardware timer.
Backlight brightness is implemented by configuring one of the timers in
the SoC for PWM mode. In this mode, two interrupts are generated for each
cycle, one at the start of the cycle and another one sometime between the
first interrupt and the start of the next cycle. The backlight is switched
on at the first interrupt and switched off at the second interrupt. This
way, the position in time of the second interrupt determines the duty cycle
and thereby the brightness of the backlight.
The backlight is switched on and off by means of a GPIO pin.
*/
void INT_TIMERA(void)
{
unsigned int tacon = TACON;
/* clear interrupts */
TACON = tacon;
/* TA_INT1, start of PWM cycle: enable backlight */
if (tacon & (1 << 17)) {
PDAT0 |= (1 << 2);
}
/* TA_INT0, disable backlight until next cycle */
if (tacon & (1 << 16)) {
PDAT0 &= ~(1 << 2);
}
}
void _backlight_set_brightness(int brightness)
{
if (brightness == MIN_BRIGHTNESS_SETTING) {
/* turn backlight fully off and disable interrupt */
PDAT0 &= ~(1 << 2);
INTMSK &= ~(1 << 5);
}
else if (brightness == MAX_BRIGHTNESS_SETTING) {
/* turn backlight fully on and disable interrupt */
PDAT0 |= (1 << 2);
INTMSK &= ~(1 << 5);
}
else {
/* set PWM width and enable interrupt */
TADATA0 = brightness;
INTMSK |= (1 << 5);
}
}
void _backlight_on(void)
{
_backlight_set_brightness(backlight_brightness);
}
void _backlight_off(void)
{
_backlight_set_brightness(MIN_BRIGHTNESS_SETTING);
}
bool _backlight_init(void)
{
/* enable backlight pin as GPIO */
PCON0 = ((PCON0 & ~(3 << 4)) | (1 << 4));
/* enable timer clock */
PWRCON &= ~(1 << 4);
/* configure timer */
TACMD = (1 << 1); /* TA_CLR */
TACMD = (1 << 0); /* TA_EN */
TACON = (1 << 13) | /* TA_INT1_EN */
(1 << 12) | /* TA_INT0_EN */
(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 */
_backlight_on();
return true;
}

0
firmware/target/arm/s5l8700/meizu-m3/backlight-target.h → firmware/target/arm/s5l8700/backlight-target.h
View file

29
firmware/target/arm/s5l8700/meizu-m6sl/backlight-target.h
View file

@ -1,29 +0,0 @@
/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2008 by Marcoen Hirschberg
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
#ifndef BACKLIGHT_TARGET_H
#define BACKLIGHT_TARGET_H
bool _backlight_init(void);
void _backlight_on(void);
void _backlight_off(void);
void _backlight_set_brightness(int brightness);
#endif

29
firmware/target/arm/s5l8700/meizu-m6sp/backlight-target.h
View file

@ -1,29 +0,0 @@
/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2008 by Marcoen Hirschberg
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
#ifndef BACKLIGHT_TARGET_H
#define BACKLIGHT_TARGET_H
bool _backlight_init(void);
void _backlight_on(void);
void _backlight_off(void);
void _backlight_set_brightness(int brightness);
#endif

9
firmware/target/arm/s5l8700/system-s5l8700.c
View file

@ -95,12 +95,13 @@ void irq_handler(void)
asm volatile( "stmfd sp!, {r0-r7, ip, lr} \n" /* Store context */
"sub sp, sp, #8 \n"); /* Reserve stack */
int irq_no = INTOFFSET; /* Read clears the corresponding IRQ status */
int irq_no = INTOFFSET;
if ((irq_no & (1<<31)) == 0) /* Ensure invalid flag is not set */
{
irqvector[irq_no]();
}
/* clear interrupt */
SRCPND = (1 << irq_no);
INTPND = INTPND;
asm volatile( "add sp, sp, #8 \n" /* Cleanup stack */
"ldmfd sp!, {r0-r7, ip, lr} \n" /* Restore context */