5f1ec307db
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@15016 a1c6a512-1295-4272-9138-f99709370657
285 lines
8.7 KiB
C
285 lines
8.7 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) 2006 by Barry Wardell
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*
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* All files in this archive are subject to the GNU General Public License.
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* See the file COPYING in the source tree root for full license agreement.
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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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/* Taken from button-h10.c by Barry Wardell and reverse engineering by MrH. */
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#include "system.h"
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#include "button.h"
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#include "backlight.h"
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#include "powermgmt.h"
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#define WHEEL_REPEAT_INTERVAL 300000
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#define WHEEL_FAST_ON_INTERVAL 20000
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#define WHEEL_FAST_OFF_INTERVAL 60000
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/* Clickwheel */
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#ifndef BOOTLOADER
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static unsigned int old_wheel_value = 0;
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static unsigned int wheel_repeat = BUTTON_NONE;
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static unsigned int wheel_click_count = 0;
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static unsigned int wheel_delta = 0;
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static int wheel_fast_mode = 0;
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static unsigned long last_wheel_usec = 0;
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static unsigned long wheel_velocity = 0;
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static long last_wheel_post = 0;
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static long next_backlight_on = 0;
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/* Buttons */
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static bool hold_button = false;
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static bool hold_button_old = false;
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#define _button_hold() hold_button
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#else
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#define _button_hold() ((GPIOF_INPUT_VAL & 0x80) != 0)
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#endif /* BOOTLOADER */
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static int int_btn = BUTTON_NONE;
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void button_int(void);
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void button_init_device(void)
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{
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/* Enable all buttons */
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GPIOF_OUTPUT_EN &= ~0xff;
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GPIOF_ENABLE |= 0xff;
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/* Scrollwheel light - enable control through GPIOG pin 7 and set timeout */
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GPIOG_OUTPUT_EN |= 0x80;
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GPIOG_ENABLE = 0x80;
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#ifndef BOOTLOADER
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/* Mask these before performing init ... because init has possibly
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occurred before */
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GPIOF_INT_EN &= ~0xff;
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GPIOH_INT_EN &= ~0xc0;
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/* Get current tick before enabling button interrupts */
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last_wheel_usec = USEC_TIMER;
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last_wheel_post = last_wheel_usec;
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GPIOH_ENABLE |= 0xc0;
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GPIOH_OUTPUT_EN &= ~0xc0;
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/* Read initial buttons */
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button_int();
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GPIOF_INT_CLR = 0xff;
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/* Read initial wheel value (bit 6-7 of GPIOH) */
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old_wheel_value = GPIOH_INPUT_VAL & 0xc0;
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GPIOH_INT_LEV = (GPIOH_INT_LEV & ~0xc0) | (old_wheel_value ^ 0xc0);
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GPIOH_INT_CLR = 0xc0;
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/* Enable button interrupts */
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GPIOF_INT_EN |= 0xff;
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GPIOH_INT_EN |= 0xc0;
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CPU_INT_EN = HI_MASK;
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CPU_HI_INT_EN = GPIO1_MASK;
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#endif /* BOOTLOADER */
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}
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bool button_hold(void)
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{
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return _button_hold();
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}
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/* clickwheel */
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#ifndef BOOTLOADER
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void clickwheel_int(void)
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{
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/* Read wheel
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* Bits 6 and 7 of GPIOH change as follows:
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* Clockwise rotation 01 -> 00 -> 10 -> 11
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* Counter-clockwise 11 -> 10 -> 00 -> 01
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*
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* This is equivalent to wheel_value of:
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* Clockwise rotation 0x40 -> 0x00 -> 0x80 -> 0xc0
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* Counter-clockwise 0xc0 -> 0x80 -> 0x00 -> 0x40
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*/
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static const unsigned char wheel_tbl[2][4] =
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{
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/* 0x00 0x40 0x80 0xc0 */ /* Wheel value */
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{ 0x40, 0xc0, 0x00, 0x80 }, /* Clockwise rotation */
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{ 0x80, 0x00, 0xc0, 0x40 }, /* Counter-clockwise */
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};
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unsigned int wheel_value;
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wheel_value = GPIOH_INPUT_VAL & 0xc0;
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GPIOH_INT_LEV = (GPIOH_INT_LEV & ~0xc0) | (wheel_value ^ 0xc0);
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GPIOH_INT_CLR = GPIOH_INT_STAT & 0xc0;
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if (!hold_button)
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{
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unsigned int btn = BUTTON_NONE;
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if (old_wheel_value == wheel_tbl[0][wheel_value >> 6])
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btn = BUTTON_SCROLL_DOWN;
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else if (old_wheel_value == wheel_tbl[1][wheel_value >> 6])
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btn = BUTTON_SCROLL_UP;
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if (btn != BUTTON_NONE)
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{
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int repeat = 1; /* assume repeat */
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unsigned long usec = USEC_TIMER;
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unsigned v = (usec - last_wheel_usec) & 0x7fffffff;
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/* wheel velocity in 0.24 fixed point - clicks/uS */
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/* velocity cap to 18 bits to allow up to x16 scaling */
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v = (v < 0x40) ? 0xffffff / 0x40 : 0xffffff / v;
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/* some velocity filtering to smooth things out */
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wheel_velocity = (7*wheel_velocity + v) / 8;
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if (btn != wheel_repeat)
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{
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/* direction reversals nullify all fast mode states */
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wheel_repeat = btn;
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repeat =
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wheel_fast_mode =
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wheel_velocity =
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wheel_click_count = 0;
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}
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if (wheel_fast_mode != 0)
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{
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/* fast OFF happens immediately when velocity drops below
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threshold */
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if (TIME_AFTER(usec,
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last_wheel_usec + WHEEL_FAST_OFF_INTERVAL))
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{
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/* moving out of fast mode */
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wheel_fast_mode = 0;
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/* reset velocity */
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wheel_velocity = 0;
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/* wheel_delta is always 1 in slow mode */
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wheel_delta = 1;
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}
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}
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else
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{
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/* fast ON gets filtered to avoid inadvertent jumps to fast mode */
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if (repeat && wheel_velocity > 0xffffff/WHEEL_FAST_ON_INTERVAL)
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{
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/* moving into fast mode */
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wheel_fast_mode = 1 << 31;
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wheel_click_count = 0;
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wheel_velocity = 0xffffff/WHEEL_FAST_OFF_INTERVAL;
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}
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else if (++wheel_click_count < 2)
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{
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btn = BUTTON_NONE;
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}
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/* wheel_delta is always 1 in slow mode */
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wheel_delta = 1;
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}
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if (TIME_AFTER(current_tick, next_backlight_on) ||
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v <= 0xffffff/(1000000/4))
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{
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/* poke backlight to turn it on or maintain it no more often
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than every 1/4 second*/
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next_backlight_on = current_tick + HZ/4;
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backlight_on();
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buttonlight_on();
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reset_poweroff_timer();
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}
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if (btn != BUTTON_NONE)
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{
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wheel_click_count = 0;
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/* generate repeats if quick enough */
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if (repeat && TIME_BEFORE(usec,
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last_wheel_post + WHEEL_REPEAT_INTERVAL))
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btn |= BUTTON_REPEAT;
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last_wheel_post = usec;
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if (queue_empty(&button_queue))
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{
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queue_post(&button_queue, btn, wheel_fast_mode |
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(wheel_delta << 24) | wheel_velocity);
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/* message posted - reset delta */
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wheel_delta = 1;
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}
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else
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{
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/* skipped post - increment delta */
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if (++wheel_delta > 0x7f)
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wheel_delta = 0x7f;
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}
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}
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last_wheel_usec = usec;
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}
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}
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old_wheel_value = wheel_value;
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}
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#endif /* BOOTLOADER */
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/* device buttons */
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void button_int(void)
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{
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unsigned char state;
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int_btn = BUTTON_NONE;
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state = GPIOF_INPUT_VAL & 0xff;
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#ifndef BOOTLOADER
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GPIOF_INT_LEV = (GPIOF_INT_LEV & ~0xff) | (state ^ 0xff);
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GPIOF_INT_CLR = GPIOF_INT_STAT;
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hold_button = (state & 0x80) != 0;
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#endif
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if (!_button_hold())
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{
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/* Read normal buttons */
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if ((state & 0x01) == 0) int_btn |= BUTTON_REC;
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if ((state & 0x02) == 0) int_btn |= BUTTON_DOWN;
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if ((state & 0x04) == 0) int_btn |= BUTTON_RIGHT;
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if ((state & 0x08) == 0) int_btn |= BUTTON_LEFT;
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if ((state & 0x10) == 0) int_btn |= BUTTON_SELECT; /* The centre button */
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if ((state & 0x20) == 0) int_btn |= BUTTON_UP; /* The "play" button */
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if ((state & 0x40) != 0) int_btn |= BUTTON_POWER;
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}
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}
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/*
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* Get button pressed from hardware
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*/
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int button_read_device(void)
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{
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#ifdef BOOTLOADER
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/* Read buttons directly in the bootloader */
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button_int();
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#else
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/* light handling */
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if (hold_button != hold_button_old)
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{
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hold_button_old = hold_button;
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backlight_hold_changed(hold_button);
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}
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#endif /* BOOTLOADER */
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/* The int_btn variable is set in the button interrupt handler */
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return int_btn;
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}
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