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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2010 Marcin Bukat
* scrollstrip logic inspired by button-mini1g.c
*
* 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 "config.h"
#include "cpu.h"
#include "system.h"
#include "kernel.h"
#include "button.h"
#include "backlight.h"
#include "adc.h"
#include "powermgmt.h"
#define SLIDER_BASE_SENSITIVITY 8
#define SLIDER_REL_TIMEOUT HZ/2
/* GPI7 H-L, GPI6 H-L, GPI7 L-H, GPI6 L-H */
#define SLIDER_GPIO_MASK ((1<<15)|(1<<14)|(1<<7)|(1<<6))
static volatile struct scroll_state_t {
signed char dir;
long timeout;
bool rel;
} scroll = { .dir = BUTTON_UP,
.timeout = SLIDER_REL_TIMEOUT,
.rel = false,
};
static inline void disable_scrollstrip_interrupts(void)
{
and_l(~SLIDER_GPIO_MASK,&GPIO_INT_EN);
}
static inline void enable_scrollstrip_interrupts(void)
{
or_l(SLIDER_GPIO_MASK,&GPIO_INT_EN);
}
static inline void ack_scrollstrip_interrupt(void)
{
or_l(SLIDER_GPIO_MASK,&GPIO_INT_CLEAR);
}
void scrollstrip_isr(void) __attribute__ ((interrupt_handler,section(".icode")));
void scrollstrip_isr(void)
{
/* reading line 6 and 7 forms four possible states:
* 0, 1 , 2, 3
* tracking the order of line changes we can judge
* if the slide is up or down in the following way:
* sliding up order: 0 2 3 1 0 2 3 1
* sliding down order: 0 1 3 2 0 1 3 2
*/
static const signed char scroll_state[4][4] ICONST_ATTR = {
{ BUTTON_NONE, BUTTON_DOWN, BUTTON_UP, BUTTON_NONE},
{ BUTTON_UP, BUTTON_NONE, BUTTON_NONE, BUTTON_DOWN},
{ BUTTON_DOWN, BUTTON_NONE, BUTTON_NONE, BUTTON_UP},
{ BUTTON_NONE, BUTTON_UP, BUTTON_DOWN, BUTTON_NONE}
};
static signed char prev_scroll_lines = -1;
static signed char direction = 0;
static unsigned char count = 0;
static long nextbacklight_hw_on = 0;
signed int new_scroll_lines;
signed int scroll_dir;
disable_scrollstrip_interrupts();
/* read GPIO6 and GPIO7 state*/
new_scroll_lines = (GPIO_READ >> 6) & 0x03;
/* was it initialized? */
if ( prev_scroll_lines == -1 )
{
prev_scroll_lines = new_scroll_lines;
goto end;
}
/* calculate the direction according to the sequence order */
scroll_dir = scroll_state[prev_scroll_lines][new_scroll_lines];
prev_scroll_lines = new_scroll_lines;
/* catch sequence error */
if (scroll_dir == BUTTON_NONE)
goto end;
/* direction reversal */
if (direction != scroll_dir)
{
/* post release event to the button queue */
if (button_queue_empty())
button_queue_post(direction|BUTTON_REL, 0);
scroll.rel = true;
direction = scroll_dir;
count = 0;
goto end;
}
/* poke backlight */
if (TIME_AFTER(current_tick, nextbacklight_hw_on))
{
backlight_on();
reset_poweroff_timer();
nextbacklight_hw_on = current_tick + HZ/4;
}
/* apply sensitivity filter */
if (++count < SLIDER_BASE_SENSITIVITY)
goto end;
count = 0;
/* post scrollstrip event to the button queue */
if (button_queue_empty())
button_queue_post(scroll_dir, 0);
scroll.dir = scroll_dir;
scroll.timeout = current_tick + SLIDER_REL_TIMEOUT;
scroll.rel = false;
end:
/* acknowledge the interrupt
* and reenable scrollstrip interrupts
*/
ack_scrollstrip_interrupt();
enable_scrollstrip_interrupts();
}
/* register interrupt service routine for scrollstrip lines */
void GPI6(void) __attribute__ ((alias("scrollstrip_isr")));
void GPI7(void) __attribute__ ((alias("scrollstrip_isr")));
void button_init_device(void)
{
/* GPIO56 (PLAY) general input
* GPIO45 (ENTER) general input
* GPIO41 (MENU) dual function pin shared with audio serial data
*
* GPIO6, GPIO7 scrollstrip lines
* GPIO31 scrollstrip enable
*/
or_l((1<<24)|(1<<13),&GPIO1_FUNCTION);
and_l(~((1<<24)|(1<<13)),&GPIO1_ENABLE);
or_l((1<<31)|(1<<7)|(1<<6),&GPIO_FUNCTION);
and_l(~((1<<7)|(1<<6)),&GPIO_ENABLE);
/* scrollstrip enable active low */
and_l(~(1<<31),&GPIO_OUT);
or_l((1<<31),&GPIO_ENABLE);
/* GPI6, GPI7 interrupt level 4.0 */
or_l((4<<28)|(4<<24), &INTPRI5);
enable_scrollstrip_interrupts();
}
bool button_hold(void)
{
/* GPIO51 active low */
return (GPIO1_READ & (1<<19))?false:true;
}
/*
* Get button pressed from hardware
*/
int button_read_device(void)
{
int btn = BUTTON_NONE;
int data = 0;
static bool hold_button = false;
#ifndef BOOTLOADER
bool hold_button_old;
/* read hold buttons status */
hold_button_old = hold_button;
#endif
hold_button = button_hold();
#ifndef BOOTLOADER
/* Only main hold affects backlight */
if (hold_button != hold_button_old)
{
backlight_hold_changed(hold_button);
if ( hold_button )
disable_scrollstrip_interrupts();
else
enable_scrollstrip_interrupts();
}
#endif
/* Skip if main hold is active */
if (!hold_button)
{
data = adc_scan(ADC_BUTTONS);
if (data < 800) /* middle */
{
if (data < 450)
{
if (data > 250)
btn |= BUTTON_FF;
}
else /* 800 - 450 */
{
if (data > 600)
btn |= BUTTON_REW;
}
}
else /* data > 800 */
{
if (data < 1150)
if (data > 950)
btn |= BUTTON_REC;
}
/* Handle GPIOs buttons
*
* GPIO56 active high PLAY/PAUSE/ON
* GPIO45 active low ENTER
* GPIO41 active low MENU
*/
data = GPIO1_READ;
if (data & (1<<24))
btn |= BUTTON_PLAY;
if (!(data & (1<<13)))
btn |= BUTTON_ENTER;
if (!(data & (1<<9)))
btn |= BUTTON_MENU;
} /* !button_hold() */
if (!scroll.rel)
if (TIME_AFTER(current_tick, scroll.timeout))
{
if (button_queue_empty())
{
button_queue_post(scroll.dir|BUTTON_REL, 0);
scroll.rel = true;
}
}
return btn;
}
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