f376fd2f4a
Move scrollwheel parsing function into separate file as it's reused. git-svn-id: svn://svn.rockbox.org/rockbox/trunk@25425 a1c6a512-1295-4272-9138-f99709370657
124 lines
4.3 KiB
C
124 lines
4.3 KiB
C
/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id$
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*
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* Copyright (C) 2009-2010 by Thomas Martitz
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#include "config.h"
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#include "button.h"
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#include "kernel.h"
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#include "backlight.h"
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void scrollwheel(unsigned int wheel_value)
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{
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#ifndef BOOTLOADER
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/* current wheel values, parsed from dbop and the resulting button */
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unsigned btn = BUTTON_NONE;
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/* old wheel values */
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static unsigned old_wheel_value = 0;
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static unsigned old_btn = BUTTON_NONE;
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/*
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* Getting BUTTON_REPEAT works like this: Remember when the btn value was
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* posted to the button_queue last, and if it was recent enough, generate
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* BUTTON_REPEAT
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*/
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static long last_wheel_post = 0;
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/*
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* Providing wheel acceleration works as follows: We increment accel
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* by 2 if the wheel was turned, and decrement it by 1 each tick
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* (no matter if it was turned), that means: the longer and faster you turn,
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* the higher accel will be. accel>>2 will actually posted to the button_queue
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*/
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static int accel = 0;
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/* We only post every 4th action, as this matches better with the physical
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* clicks of the wheel */
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static int counter = 0;
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/* Read wheel
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* Bits 13 and 14 of DBOP_DIN change as follows (Gray Code):
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* Clockwise rotation 00 -> 01 -> 11 -> 10 -> 00
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* Counter-clockwise 00 -> 10 -> 11 -> 01 -> 00
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*
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* For easy look-up, actual wheel values act as indicies also,
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* which is why the table seems to be not ordered correctly
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*/
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static const unsigned char wheel_tbl[2][4] =
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{
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{ 2, 0, 3, 1 }, /* Clockwise rotation */
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{ 1, 3, 0, 2 }, /* Counter-clockwise */
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};
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if(button_hold())
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{
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accel = counter = 0;
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return;
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}
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if (old_wheel_value == wheel_tbl[0][wheel_value])
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btn = BUTTON_SCROLL_FWD;
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else if (old_wheel_value == wheel_tbl[1][wheel_value])
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btn = BUTTON_SCROLL_BACK;
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else if (old_wheel_value != wheel_value && accel > ACCEL_INCREMENT)
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{ /* if no button is read and wheel_value changed, assume old_btn */
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btn = old_btn;
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}
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/* else btn = BUTTON_NONE */
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if (btn != BUTTON_NONE)
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{
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if (btn != old_btn)
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{
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/* direction reversals nullify acceleration and counters */
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old_btn = btn;
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accel = counter = 0;
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}
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/* wheel_delta will cause lists to jump over items,
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* we want this for fast scrolling, but we must keep it accurate
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* for slow scrolling */
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int wheel_delta = 0;
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/* generate BUTTON_REPEAT if quick enough, scroll slightly faster too*/
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if (TIME_BEFORE(current_tick, last_wheel_post + WHEEL_REPEAT_INTERVAL))
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{
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btn |= BUTTON_REPEAT;
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wheel_delta = accel>>ACCEL_SHIFT;
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}
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accel += ACCEL_INCREMENT;
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/* the wheel is more reliable if we don't send every change,
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* every WHEEL_COUNTER_DIVth is basically one "physical click"
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* which should make up 1 item in lists */
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if (++counter >= WHEEL_COUNTER_DIV && queue_empty(&button_queue))
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{
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buttonlight_on();
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backlight_on();
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queue_post(&button_queue, btn, ((wheel_delta+1)<<24));
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/* message posted - reset count and remember post */
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counter = 0;
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last_wheel_post = current_tick;
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}
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}
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if (accel > 0)
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accel--;
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old_wheel_value = wheel_value;
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#else
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(void)wheel_value
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#endif
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}
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