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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2006 by Barry Wardell
*
* 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.
*
****************************************************************************/
/* Taken from button-h10.c by Barry Wardell and reverse engineering by MrH. */
#include "system.h"
#include "button.h"
#include "backlight.h"
#include "powermgmt.h"
static bool hold_button = false;
#ifndef BOOTLOADER
static bool hold_button_old = false;
#endif
static short _dbop_din = 0;
#define WHEEL_REPEAT_INTERVAL (HZ/5)
/* in the lcd driver */
extern bool lcd_button_support(void);
void button_init_device(void)
{
}
bool button_hold(void)
{
return hold_button;
}
#if !defined(BOOTLOADER) && defined(HAVE_SCROLLWHEEL)
static void scrollwheel(short dbop_din)
{
/* current wheel values, parsed from dbop and the resulting button */
unsigned wheel_value = 0;
unsigned btn = BUTTON_NONE;
/* old wheel values */
static unsigned old_wheel_value = 0;
static unsigned old_btn = BUTTON_NONE;
/* getting BUTTON_REPEAT works like this: Remember when the btn value was
* posted to the button_queue last, and if it was recent enough, generate
* BUTTON_REPEAT
*/
static long last_wheel_post = 0;
/* Repeat is used for the scrollwheel acceleration. If high enough then
* jump over some items */
static unsigned repeat = 0;
/* we omit 1 of 2 posts to the button_queue, that works better, so count */
static int counter = 0;
/* Read wheel
* Bits 13 and 14 of DBOP_DIN change as follows:
* Clockwise rotation 00 -> 01 -> 11 -> 10 -> 00
* Counter-clockwise 00 -> 10 -> 11 -> 01 -> 00
*/
static const unsigned char wheel_tbl[2][4] =
{
{ 2, 0, 3, 1 }, /* Clockwise rotation */
{ 1, 3, 0, 2 }, /* Counter-clockwise */
};
if(hold_button)
{
repeat = counter = 0;
return;
}
wheel_value = dbop_din & (1<<13|1<<14);
wheel_value >>= 13;
if (old_wheel_value == wheel_tbl[0][wheel_value])
btn = BUTTON_SCROLL_FWD;
else if (old_wheel_value == wheel_tbl[1][wheel_value])
btn = BUTTON_SCROLL_BACK;
if (btn != BUTTON_NONE)
{
if (btn != old_btn)
{
/* direction reversals nullify repeats */
old_btn = btn;
repeat = counter = 0;
}
if (btn != BUTTON_NONE)
{
/* wheel_delta will cause lists to jump over items,
* we want this for fast scrolling, but we must keep it accurate
* for slow scrolling */
int wheel_delta = 0;
/* generate repeats if quick enough, scroll slightly too*/
if (TIME_BEFORE(current_tick, last_wheel_post + WHEEL_REPEAT_INTERVAL))
{
btn |= BUTTON_REPEAT;
wheel_delta = repeat>>2;
}
repeat += 2;
/* the wheel is more reliable if we don't send ever change,
* every 2th is basically one "physical click" is
* 1 item in the rockbox menus */
if (++counter >= 2 && queue_empty(&button_queue))
{
buttonlight_on();
backlight_on();
queue_post(&button_queue, btn, ((wheel_delta+1)<<24));
/* message posted - reset count & last post to the queue */
counter = 0;
last_wheel_post = current_tick;
}
}
}
if (repeat > 0)
repeat--;
old_wheel_value = wheel_value;
}
#endif /* !defined(BOOTLOADER) && defined(HAVE_SCROLLWHEEL) */
short button_read_dbop(void)
{
/*write a red pixel */
if (!lcd_button_support())
return _dbop_din;
/* Set up dbop for input */
while (!(DBOP_STAT & (1<<10))); /* Wait for fifo to empty */
DBOP_CTRL |= (1<<19); /* Tri-state DBOP on read cycle */
DBOP_CTRL &= ~(1<<16); /* disable output (1:write enabled) */
DBOP_TIMPOL_01 = 0xe167e167; /* Set Timing & Polarity regs 0 & 1 */
DBOP_TIMPOL_23 = 0xe167006e; /* Set Timing & Polarity regs 2 & 3 */
DBOP_CTRL |= (1<<15); /* start read */
while (!(DBOP_STAT & (1<<16))); /* wait for valid data */
_dbop_din = DBOP_DIN; /* Read dbop data*/
/* Reset dbop for output */
DBOP_TIMPOL_01 = 0x6e167; /* Set Timing & Polarity regs 0 & 1 */
DBOP_TIMPOL_23 = 0xa167e06f; /* Set Timing & Polarity regs 2 & 3 */
DBOP_CTRL |= (1<<16); /* Enable output (0:write disable) */
DBOP_CTRL &= ~(1<<19); /* Tri-state when no active write */
#if !defined(BOOTLOADER) && defined(HAVE_SCROLLWHEEL)
scrollwheel(_dbop_din);
#endif
return _dbop_din;
}
short button_dbop_data(void)
{
return _dbop_din;
}
/*
* Get button pressed from hardware
*/
int button_read_device(void)
{
int btn = BUTTON_NONE;
/* read buttons from dbop */
short dbop = button_read_dbop();
/* hold button */
if(dbop & (1<<12))
{
hold_button = true;
return btn;
}
else
{
hold_button = false;
}
if (dbop & (1<<8))
btn |= BUTTON_POWER;
if (!(dbop & (1<<15)))
btn |= BUTTON_REC;
/* Set afsel, so that we can read our buttons */
GPIOC_AFSEL &= ~(1<<2|1<<3|1<<4|1<<5|1<<6);
/* set dir so we can read our buttons (but reset the C pins first) */
GPIOB_DIR &= ~(1<<4);
GPIOC_DIR |= (1<<2|1<<3|1<<4|1<<5|1<<6);
GPIOC_PIN(2) |= (1<<2);
GPIOC_PIN(3) |= (1<<3);
GPIOC_PIN(4) |= (1<<4);
GPIOC_PIN(5) |= (1<<5);
GPIOC_PIN(6) |= (1<<6);
GPIOC_DIR &= ~(1<<2|1<<3|1<<4|1<<5|1<<6);
int delay = 2; /* small delay needed to read buttons correctly */
while(delay--);
/* direct GPIO connections */
if (!GPIOC_PIN(2))
btn |= BUTTON_UP;
if (!GPIOC_PIN(3))
btn |= BUTTON_LEFT;
if (!GPIOC_PIN(4))
btn |= BUTTON_SELECT;
if (!GPIOC_PIN(5))
btn |= BUTTON_RIGHT;
if (!GPIOC_PIN(6))
btn |= BUTTON_DOWN;
/* return to settings needed for lcd */
GPIOC_DIR |= (1<<2|1<<3|1<<4|1<<5|1<<6);
GPIOC_AFSEL |= (1<<2|1<<3|1<<4|1<<5|1<<6);
#ifndef BOOTLOADER
/* light handling */
if (hold_button != hold_button_old)
{
hold_button_old = hold_button;
backlight_hold_changed(hold_button);
}
#endif /* BOOTLOADER */
/* The int_btn variable is set in the button interrupt handler */
return btn;
}
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