e53ede9b2b
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@25434 a1c6a512-1295-4272-9138-f99709370657
124 lines
4.3 KiB
C
124 lines
4.3 KiB
C
/***************************************************************************
|
|
* __________ __ ___.
|
|
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
|
|
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
|
|
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
|
|
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
|
|
* \/ \/ \/ \/ \/
|
|
* $Id$
|
|
*
|
|
* Copyright (C) 2009-2010 by Thomas Martitz
|
|
*
|
|
* 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 "button.h"
|
|
#include "kernel.h"
|
|
#include "backlight.h"
|
|
|
|
void scrollwheel(unsigned int wheel_value)
|
|
{
|
|
#ifndef BOOTLOADER
|
|
/* current wheel values, parsed from dbop and the resulting button */
|
|
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;
|
|
|
|
/*
|
|
* Providing wheel acceleration works as follows: We increment accel
|
|
* by 2 if the wheel was turned, and decrement it by 1 each tick
|
|
* (no matter if it was turned), that means: the longer and faster you turn,
|
|
* the higher accel will be. accel>>2 will actually posted to the button_queue
|
|
*/
|
|
static int accel = 0;
|
|
/* We only post every 4th action, as this matches better with the physical
|
|
* clicks of the wheel */
|
|
static int counter = 0;
|
|
/* Read wheel
|
|
* Bits 13 and 14 of DBOP_DIN change as follows (Gray Code):
|
|
* Clockwise rotation 00 -> 01 -> 11 -> 10 -> 00
|
|
* Counter-clockwise 00 -> 10 -> 11 -> 01 -> 00
|
|
*
|
|
* For easy look-up, actual wheel values act as indicies also,
|
|
* which is why the table seems to be not ordered correctly
|
|
*/
|
|
static const unsigned char wheel_tbl[2][4] =
|
|
{
|
|
{ 2, 0, 3, 1 }, /* Clockwise rotation */
|
|
{ 1, 3, 0, 2 }, /* Counter-clockwise */
|
|
};
|
|
|
|
if(button_hold())
|
|
{
|
|
accel = counter = 0;
|
|
return;
|
|
}
|
|
|
|
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;
|
|
else if (old_wheel_value != wheel_value && accel > ACCEL_INCREMENT)
|
|
{ /* if no button is read and wheel_value changed, assume old_btn */
|
|
btn = old_btn;
|
|
}
|
|
/* else btn = BUTTON_NONE */
|
|
|
|
if (btn != BUTTON_NONE)
|
|
{
|
|
if (btn != old_btn)
|
|
{
|
|
/* direction reversals nullify acceleration and counters */
|
|
old_btn = btn;
|
|
accel = counter = 0;
|
|
}
|
|
/* 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 BUTTON_REPEAT if quick enough, scroll slightly faster too*/
|
|
if (TIME_BEFORE(current_tick, last_wheel_post + WHEEL_REPEAT_INTERVAL))
|
|
{
|
|
btn |= BUTTON_REPEAT;
|
|
wheel_delta = accel>>ACCEL_SHIFT;
|
|
}
|
|
|
|
accel += ACCEL_INCREMENT;
|
|
|
|
/* the wheel is more reliable if we don't send every change,
|
|
* every WHEEL_COUNTER_DIVth is basically one "physical click"
|
|
* which should make up 1 item in lists */
|
|
if (++counter >= WHEEL_COUNTER_DIV && queue_empty(&button_queue))
|
|
{
|
|
buttonlight_on();
|
|
backlight_on();
|
|
queue_post(&button_queue, btn, ((wheel_delta+1)<<24));
|
|
/* message posted - reset count and remember post */
|
|
counter = 0;
|
|
last_wheel_post = current_tick;
|
|
}
|
|
}
|
|
if (accel > 0)
|
|
accel--;
|
|
|
|
old_wheel_value = wheel_value;
|
|
#else
|
|
(void)wheel_value;
|
|
#endif
|
|
}
|