f6912d3bbb
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@28096 a1c6a512-1295-4272-9138-f99709370657
325 lines
9.2 KiB
C
325 lines
9.2 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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* 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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/* 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_VELOCITY 35 /* deg/s */
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#define WHEEL_SMOOTHING_VELOCITY 50 /* deg/s */
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#define WHEEL_FAST_ON_VELOCITY 350 /* deg/s */
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#define WHEEL_FAST_OFF_VELOCITY 150 /* deg/s */
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#define WHEEL_BASE_SENSITIVITY 2
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#define WHEELCLICKS_PER_ROTATION 48 /* wheelclicks per full rotation */
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#ifndef BOOTLOADER
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/* Wheel */
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static int read_wheel_keycode(void);
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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_init_device(void)
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{
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/* Enable all buttons */
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GPIO_CLEAR_BITWISE(GPIOF_OUTPUT_EN, 0xff);
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GPIO_SET_BITWISE(GPIOF_ENABLE, 0xff);
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/* Scrollwheel light - enable control through GPIOG pin 7 and set timeout */
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GPIO_SET_BITWISE(GPIOG_OUTPUT_EN, 0x80);
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GPIO_SET_BITWISE(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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GPIO_CLEAR_BITWISE(GPIOF_INT_EN, 0xff);
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GPIO_CLEAR_BITWISE(GPIOH_INT_EN, 0xc0);
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GPIO_CLEAR_BITWISE(GPIOH_OUTPUT_EN, 0xc0);
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GPIO_SET_BITWISE(GPIOH_ENABLE, 0xc0);
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/* Read initial buttons */
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button_int();
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/* Read initial wheel value (bit 6-7 of GPIOH) */
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read_wheel_keycode();
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/* Enable button interrupts */
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GPIO_SET_BITWISE(GPIOF_INT_EN, 0xff);
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GPIO_SET_BITWISE(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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static int read_wheel_keycode(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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static unsigned long prev_value;
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int keycode = BUTTON_NONE;
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unsigned long value = GPIOH_INPUT_VAL & 0xc0;
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GPIO_WRITE_BITWISE(GPIOH_INT_LEV, value ^ 0xc0, 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 long prev = prev_value;
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int scroll = value >> 6;
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if (prev == wheel_tbl[0][scroll])
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keycode = BUTTON_SCROLL_FWD;
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else if (prev == wheel_tbl[1][scroll])
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keycode = BUTTON_SCROLL_BACK;
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}
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prev_value = value;
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return keycode;
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}
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void clickwheel_int(void)
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{
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static int prev_keycode = BUTTON_NONE;
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static int prev_keypost = BUTTON_NONE;
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static int count = 0;
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static int fast_mode = 0;
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static long next_backlight_on = 0;
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static unsigned long prev_usec[WHEEL_BASE_SENSITIVITY] = { 0 };
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static unsigned long delta = 1ul << 24;
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static unsigned long velocity = 0; /* Velocity smoothed or unsmoothed */
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unsigned long usec = USEC_TIMER;
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unsigned long v; /* Raw velocity */
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int keycode = read_wheel_keycode();
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if (keycode == BUTTON_NONE)
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return;
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/* Spurious wheel "reversals" are not uncommon. Resetting also helps
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* cover them up. As such, prev_keypost is also not reset or else false
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* non-repeats are generated when it happens. */
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if (keycode != prev_keycode)
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{
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/* Direction reversals reset state */
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unsigned long usec_back = 360000000ul /
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(WHEEL_REPEAT_VELOCITY*WHEELCLICKS_PER_ROTATION);
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prev_keycode = keycode;
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count = 0;
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fast_mode = 0;
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prev_usec[0] = usec - usec_back;
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prev_usec[1] = prev_usec[0] - usec_back;
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delta = 1ul << 24;
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velocity = 0;
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}
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if (TIME_AFTER(current_tick, next_backlight_on))
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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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#ifdef HAVE_BUTTON_LIGHT
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buttonlight_on();
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#endif
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reset_poweroff_timer();
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}
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/* Calculate deg/s based upon interval and number of clicks in that
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* interval - FIR moving average */
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v = usec - prev_usec[1];
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if ((long)v <= 0)
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{
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/* timer wrapped (no activity for awhile), skip acceleration */
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v = 0;
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delta = 1ul << 24;
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}
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else
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{
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/* Check overflow below */
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if (v > 0xfffffffful / WHEELCLICKS_PER_ROTATION)
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v = 0xfffffffful / WHEELCLICKS_PER_ROTATION;
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v = 360000000ul*WHEEL_BASE_SENSITIVITY / (v*WHEELCLICKS_PER_ROTATION);
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if (v > 0xfffffful)
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v = 0xfffffful; /* limit to 24 bits */
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}
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prev_usec[1] = prev_usec[0];
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prev_usec[0] = usec;
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if (v < WHEEL_SMOOTHING_VELOCITY)
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{
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/* Very slow - no smoothing */
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velocity = v;
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/* Ensure backlight never gets stuck for an extended period if tick
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* wrapped such that next poke is very far ahead */
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next_backlight_on = current_tick - 1;
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}
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else
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{
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/* Some velocity filtering to smooth things out */
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velocity = (7*velocity + v) / 8;
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}
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if (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 (v < WHEEL_FAST_OFF_VELOCITY)
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{
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fast_mode = 0; /* moving out of fast mode */
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velocity = v;
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/* delta is always 1 in slow mode */
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delta = 1ul << 24;
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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 (velocity >= WHEEL_FAST_ON_VELOCITY)
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fast_mode = 1; /* moving into fast mode */
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/* delta is always 1 in slow mode */
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delta = 1ul << 24;
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}
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count += fast_mode + 1;
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if (count < WHEEL_BASE_SENSITIVITY)
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return;
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count = 0;
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if (queue_empty(&button_queue))
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{
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/* Post wheel keycode with wheel data */
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int key = keycode;
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if (v >= WHEEL_REPEAT_VELOCITY && prev_keypost == key)
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{
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/* Quick enough and same key is being posted more than once in a
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* row - generate repeats - use unsmoothed v */
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key |= BUTTON_REPEAT;
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}
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prev_keypost = keycode;
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queue_post(&button_queue, key, (fast_mode << 31) | delta | velocity);
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/* Message posted - reset delta */
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delta = 1ul << 24;
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}
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else
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{
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/* Skipped post - increment delta and limit to 7 bits */
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delta += 1ul << 24;
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if (delta > (0x7ful << 24))
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delta = 0x7ful << 24;
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}
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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 long state = GPIOF_INPUT_VAL & 0xff;
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#ifndef BOOTLOADER
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unsigned long status = GPIOF_INT_STAT;
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GPIO_WRITE_BITWISE(GPIOF_INT_LEV, state ^ 0xff, 0xff);
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GPIOF_INT_CLR = status;
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hold_button = (state & 0x80) != 0;
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#endif
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int_btn = BUTTON_NONE;
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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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