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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2008 by Thomas Martitz
* Copyright (C) 2008 by Dominik Wenger
*
* 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.
*
****************************************************************************/
/* Basic button driver for the Fuze
*
* TODO: - Get the wheel working with interrupts
* - find that Home button
*/
#include "system.h"
#include "button.h"
#include "button-target.h"
#include "backlight.h"
/* Buttons */
static bool hold_button = false;
#ifndef BOOTLOADER
static bool hold_button_old = false;
#endif
static short _dbop_din = BUTTON_NONE;
/* in the lcd driver */
extern bool lcd_button_support(void);
void button_init_device(void)
{
GPIOA_DIR |= (1<<1);
GPIOA_PIN(1) = (1<<1);
}
#if !defined(BOOTLOADER) && defined(HAVE_SCROLLWHEEL)
static void scrollwheel(short dbop)
{
/* 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 wheel_repeat = BUTTON_NONE;
/* getting BUTTON_REPEAT works like this: We increment repeat by 2 if the
* wheel was turned, and decrement it by 1 each tick,
* that means: if you change the wheel fast enough, repeat will be >1 and
* we send BUTTON_REPEAT
*/
static int repeat = 0;
/* we omit 3 of 4 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 */
};
wheel_value = dbop & (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 != wheel_repeat)
{
/* direction reversals nullify repeats */
wheel_repeat = btn;
repeat = 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 faster too*/
if (repeat > 1)
{
btn |= BUTTON_REPEAT;
wheel_delta = repeat>>2;
}
repeat += 2;
/* the wheel is more reliable if we don't send ever change,
* every 4th is basically one "physical click" is 1 item in
* the rockbox menus */
if (++counter >= 4 && queue_empty(&button_queue))
{
buttonlight_on();
backlight_on();
queue_post(&button_queue, btn, ((wheel_delta+1)<<24));
/* message posted - reset count */
counter = 0;
}
}
}
if (repeat > 0)
repeat--;
else
repeat = 0;
old_wheel_value = wheel_value;
}
#endif /* !defined(BOOTLOADER) && defined(SCROLLWHEEL) */
bool button_hold(void)
{
return hold_button;
}
static short button_dbop(void)
{
/* skip home and power reading if lcd_button_support was blocked,
* since the dbop bit 15 is invalid then, and use the old value instead */
/* -20 (arbitary value) indicates valid home&power button read */
int old_home_power = -20;
if(!lcd_button_support())
{
old_home_power = (_dbop_din & (1<<15|1<<8));
}
/* Wait for fifo to empty */
while ((DBOP_STAT & (1<<10)) == 0);
DBOP_CTRL |= (1<<19);
DBOP_CTRL &= ~(1<<16); /* disable output */
DBOP_TIMPOL_01 = 0xe167e167;
DBOP_TIMPOL_23 = 0xe167006e;
DBOP_CTRL |= (1<<15); /* start read */
while((DBOP_STAT & (1<<16)) == 0); /* wait for valid data */
_dbop_din = DBOP_DIN; /* now read */
DBOP_TIMPOL_01 = 0x6e167;
DBOP_TIMPOL_23 = 0xa167e06f;
DBOP_CTRL |= (1<<16);
DBOP_CTRL &= ~(1<<19);
/* write back old values if blocked */
if (old_home_power != -20)
{
_dbop_din |= old_home_power & 1<<15;
_dbop_din &= 0xfeff|(old_home_power & 1<<8);
}
return _dbop_din;
}
/* for the debug menu */
short button_dbop_data(void)
{
return _dbop_din;
}
static int button_gpio(void)
{
int btn = BUTTON_NONE;
if(hold_button)
return btn;
/* 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);
/* small delay needed to read buttons correctly */
int delay = 0;
while(delay++ < 32);
/* direct GPIO connections */
if (!GPIOC_PIN(3))
btn |= BUTTON_LEFT;
if (!GPIOC_PIN(2))
btn |= BUTTON_UP;
if (!GPIOC_PIN(6))
btn |= BUTTON_DOWN;
if (!GPIOC_PIN(5))
btn |= BUTTON_RIGHT;
if (!GPIOC_PIN(4))
btn |= BUTTON_SELECT;
/* 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);
return btn;
}
/*
* Get button pressed from hardware
*/
int button_read_device(void)
{
int btn = BUTTON_NONE;
short dbop = button_dbop();
static unsigned power_counter = 0;
/* hold button */
if(dbop & (1<<12))
{
power_counter = HZ;
hold_button = true;
}
else
{
hold_button = false;
#if defined(HAVE_SCROLLWHEEL) && !defined(BOOTLOADER)
/* read wheel on bit 13 & 14, but sent to the button queue seperately */
scrollwheel(dbop);
#endif
/* read power on bit 8, but not if hold button was just released, since
* you basically always hit power due to the slider mechanism after releasing
* hold (wait ~1 sec) */
if (power_counter)
power_counter--;
if (!power_counter && dbop & (1<<8))
btn |= BUTTON_POWER;
/* read home on bit 15 */
if (!(dbop & (1<<15)))
btn |= BUTTON_HOME;
btn |= button_gpio();
}
#ifndef BOOTLOADER
/* light handling */
if (hold_button != hold_button_old)
{
hold_button_old = hold_button;
backlight_hold_changed(hold_button);
}
#endif /* BOOTLOADER */
return btn;
}
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