248 lines
7.5 KiB
C
248 lines
7.5 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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static bool hold_button = false;
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#ifndef BOOTLOADER
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static bool hold_button_old = false;
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#endif
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static unsigned short _dbop_din = 0;
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/* read_missed is true if buttons could not
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* be read (see lcd_button_support) */
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static bool read_missed = false;
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#define WHEEL_REPEAT_INTERVAL (HZ/4)
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/* in the lcd driver */
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extern bool lcd_button_support(void);
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void button_init_device(void)
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{
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}
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bool button_hold(void)
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{
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return hold_button;
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}
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#if !defined(BOOTLOADER) && defined(HAVE_SCROLLWHEEL)
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static void scrollwheel(unsigned short dbop_din)
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{
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/* current wheel values, parsed from dbop and the resulting button */
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unsigned wheel_value = 0;
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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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/* 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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/* Repeat is used for the scrollwheel acceleration. If high enough then
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* jump over some items */
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static unsigned repeat = 0;
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/* we omit 1 of 2 posts to the button_queue, that works better, so count */
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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:
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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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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(hold_button)
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{
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repeat = counter = 0;
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return;
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}
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wheel_value = dbop_din & (1<<13|1<<14);
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wheel_value >>= 13;
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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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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 repeats */
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old_btn = btn;
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repeat = 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 repeats if quick enough, scroll slightly 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 = repeat>>1;
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}
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repeat += 3;
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/* the wheel is more reliable if we don't send ever change,
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* every 2th is basically one "physical click" is
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* 1 item in the rockbox menus */
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if (++counter >= 2 && 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 & last post to the queue */
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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 (repeat > 0 && !read_missed)
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repeat--;
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old_wheel_value = wheel_value;
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}
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#endif /* !defined(BOOTLOADER) && defined(HAVE_SCROLLWHEEL) */
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unsigned short button_read_dbop(void)
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{
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/*write a red pixel */
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if (!lcd_button_support())
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{
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read_missed = true;
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}
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if (!read_missed)
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{
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/* Set up dbop for input */
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while (!(DBOP_STAT & (1<<10))); /* Wait for fifo to empty */
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DBOP_CTRL |= (1<<19); /* Tri-state DBOP on read cycle */
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DBOP_CTRL &= ~(1<<16); /* disable output (1:write enabled) */
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DBOP_TIMPOL_01 = 0xe167e167; /* Set Timing & Polarity regs 0 & 1 */
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DBOP_TIMPOL_23 = 0xe167006e; /* Set Timing & Polarity regs 2 & 3 */
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DBOP_CTRL |= (1<<15); /* start read */
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while (!(DBOP_STAT & (1<<16))); /* wait for valid data */
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int delay=10;
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while(delay--); /* short delay before reading */
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_dbop_din = DBOP_DIN; /* Read dbop data*/
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/* Reset dbop for output */
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DBOP_TIMPOL_01 = 0x6e167; /* Set Timing & Polarity regs 0 & 1 */
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DBOP_TIMPOL_23 = 0xa167e06f; /* Set Timing & Polarity regs 2 & 3 */
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DBOP_CTRL |= (1<<16); /* Enable output (0:write disable) */
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DBOP_CTRL &= ~(1<<19); /* Tri-state when no active write */
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}
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#if !defined(BOOTLOADER) && defined(HAVE_SCROLLWHEEL)
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scrollwheel(_dbop_din);
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#endif
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read_missed = false;
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return _dbop_din;
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}
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unsigned short button_dbop_data(void)
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{
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return _dbop_din;
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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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int btn = BUTTON_NONE;
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/* read buttons from dbop */
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unsigned short dbop = button_read_dbop();
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/* hold button */
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if(dbop & (1<<12))
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{
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hold_button = true;
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return btn;
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}
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else
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{
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hold_button = false;
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}
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if (dbop & (1<<8))
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btn |= BUTTON_POWER;
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if (!(dbop & (1<<15)))
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btn |= BUTTON_REC;
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/* Set afsel, so that we can read our buttons */
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GPIOC_AFSEL &= ~(1<<2|1<<3|1<<4|1<<5|1<<6);
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/* set dir so we can read our buttons (but reset the C pins first) */
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GPIOB_DIR &= ~(1<<4);
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GPIOC_DIR |= (1<<2|1<<3|1<<4|1<<5|1<<6);
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GPIOC_PIN(2) |= (1<<2);
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GPIOC_PIN(3) |= (1<<3);
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GPIOC_PIN(4) |= (1<<4);
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GPIOC_PIN(5) |= (1<<5);
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GPIOC_PIN(6) |= (1<<6);
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GPIOC_DIR &= ~(1<<2|1<<3|1<<4|1<<5|1<<6);
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int delay = 8; /* small delay needed to read buttons correctly */
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while(delay--);
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/* direct GPIO connections */
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if (!GPIOC_PIN(2))
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btn |= BUTTON_UP;
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if (!GPIOC_PIN(3))
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btn |= BUTTON_LEFT;
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if (!GPIOC_PIN(4))
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btn |= BUTTON_SELECT;
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if (!GPIOC_PIN(5))
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btn |= BUTTON_RIGHT;
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if (!GPIOC_PIN(6))
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btn |= BUTTON_DOWN;
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/* return to settings needed for lcd */
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GPIOC_DIR |= (1<<2|1<<3|1<<4|1<<5|1<<6);
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GPIOC_AFSEL |= (1<<2|1<<3|1<<4|1<<5|1<<6);
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#ifndef BOOTLOADER
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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 btn;
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}
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