/*************************************************************************** * __________ __ ___. * Open \______ \ ____ ____ | | _\_ |__ _______ ___ * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ / * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < < * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \ * \/ \/ \/ \/ \/ * $Id$ * * Copyright (C) 2008 by Thomas Martitz * Copyright (C) 2008 by Dominik Wenger * * 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. * ****************************************************************************/ /* Basic button driver for the Fuze * * TODO: - Get the wheel working with interrupts * - find that Home button */ #include "system.h" #include "button.h" #include "button-target.h" #include "backlight.h" /* Buttons */ static bool hold_button = false; #ifndef BOOTLOADER static bool hold_button_old = false; #endif static short _dbop_din = BUTTON_NONE; /* in the lcd driver */ extern bool lcd_button_support(void); void button_init_device(void) { GPIOA_DIR |= (1<<1); GPIOA_PIN(1) = (1<<1); } #if !defined(BOOTLOADER) && defined(HAVE_SCROLLWHEEL) static void scrollwheel(short dbop_din) { /* current wheel values, parsed from dbop and the resulting button */ unsigned wheel_value = 0; unsigned btn = BUTTON_NONE; /* old wheel values */ static unsigned old_wheel_value = 0; static unsigned wheel_repeat = BUTTON_NONE; /* getting BUTTON_REPEAT works like this: We increment repeat by 2 if the * wheel was turned, and decrement it by 1 each tick, * that means: if you change the wheel fast enough, repeat will be >1 and * we send BUTTON_REPEAT */ static int repeat = 0; /* we omit 3 of 4 posts to the button_queue, that works better, so count */ static int counter = 0; /* Read wheel * Bits 13 and 14 of DBOP_DIN change as follows: * Clockwise rotation 00 -> 01 -> 11 -> 10 -> 00 * Counter-clockwise 00 -> 10 -> 11 -> 01 -> 00 */ static const unsigned char wheel_tbl[2][4] = { { 2, 0, 3, 1 }, /* Clockwise rotation */ { 1, 3, 0, 2 }, /* Counter-clockwise */ }; wheel_value = dbop_din & (1<<13|1<<14); wheel_value >>= 13; 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; if (btn != BUTTON_NONE) { if (btn != wheel_repeat) { /* direction reversals nullify repeats */ wheel_repeat = btn; repeat = counter = 0; } if (btn != BUTTON_NONE) { /* 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 repeats if quick enough, scroll slightly faster too*/ if (repeat > 1) { btn |= BUTTON_REPEAT; wheel_delta = repeat>>2; } repeat += 2; /* the wheel is more reliable if we don't send ever change, * every 4th is basically one "physical click" is 1 item in * the rockbox menus */ if (++counter >= 4 && queue_empty(&button_queue)) { buttonlight_on(); backlight_on(); queue_post(&button_queue, btn, ((wheel_delta+1)<<24)); /* message posted - reset count */ counter = 0; } } } if (repeat > 0) repeat--; else repeat = 0; old_wheel_value = wheel_value; } #endif /* !defined(BOOTLOADER) && defined(SCROLLWHEEL) */ bool button_hold(void) { return hold_button; } static void button_delay(void) { int i = 32; while(i--); } short button_read_dbop(void) { /* skip home and power reading if lcd_button_support was blocked, * since the dbop bit 15 is invalid then, and use the old value instead */ /* -20 (arbitary value) indicates valid home&power button read */ int old_home_power = -20; if(!lcd_button_support()) { old_home_power = (_dbop_din & (1<<15|1<<8)); } /* Set up dbop for input */ while (!(DBOP_STAT & (1<<10))); /* Wait for fifo to empty */ DBOP_CTRL |= (1<<19); /* Tri-state DBOP on read cycle */ DBOP_CTRL &= ~(1<<16); /* disable output (1:write enabled) */ DBOP_TIMPOL_01 = 0xe167e167; /* Set Timing & Polarity regs 0 & 1 */ DBOP_TIMPOL_23 = 0xe167006e; /* Set Timing & Polarity regs 2 & 3 */ button_delay(); DBOP_CTRL |= (1<<15); /* start read */ while (!(DBOP_STAT & (1<<16))); /* wait for valid data */ _dbop_din = DBOP_DIN; /* Read dbop data*/ /* Reset dbop for output */ DBOP_TIMPOL_01 = 0x6e167; /* Set Timing & Polarity regs 0 & 1 */ DBOP_TIMPOL_23 = 0xa167e06f; /* Set Timing & Polarity regs 2 & 3 */ DBOP_CTRL |= (1<<16); /* Enable output (0:write disable) */ DBOP_CTRL &= ~(1<<19); /* Tri-state when no active write */ /* write back old values if blocked */ if (old_home_power != -20) { _dbop_din |= old_home_power & 1<<15; _dbop_din &= 0xfeff|(old_home_power & 1<<8); } #if defined(HAVE_SCROLLWHEEL) && !defined(BOOTLOADER) /* read wheel on bit 13 & 14, but sent to the button queue seperately */ scrollwheel(_dbop_din); #endif return _dbop_din; } /* for the debug menu */ short button_dbop_data(void) { return _dbop_din; } static int button_gpio(void) { int btn = BUTTON_NONE; if(hold_button) return btn; /* set afsel, so that we can read our buttons */ GPIOC_AFSEL &= ~(1<<2|1<<3|1<<4|1<<5|1<<6); /* set dir so we can read our buttons (but reset the C pins first) */ GPIOB_DIR &= ~(1<<4); GPIOC_DIR |= (1<<2|1<<3|1<<4|1<<5|1<<6); GPIOC_PIN(2) = (1<<2); GPIOC_PIN(3) = (1<<3); GPIOC_PIN(4) = (1<<4); GPIOC_PIN(5) = (1<<5); GPIOC_PIN(6) = (1<<6); GPIOC_DIR &= ~(1<<2|1<<3|1<<4|1<<5|1<<6); /* small delay needed to read buttons correctly */ int delay = 0; while(delay++ < 32); /* direct GPIO connections */ if (!GPIOC_PIN(3)) btn |= BUTTON_LEFT; if (!GPIOC_PIN(2)) btn |= BUTTON_UP; if (!GPIOC_PIN(6)) btn |= BUTTON_DOWN; if (!GPIOC_PIN(5)) btn |= BUTTON_RIGHT; if (!GPIOC_PIN(4)) btn |= BUTTON_SELECT; /* return to settings needed for lcd */ GPIOC_DIR |= (1<<2|1<<3|1<<4|1<<5|1<<6); GPIOC_AFSEL |= (1<<2|1<<3|1<<4|1<<5|1<<6); return btn; } /* * Get button pressed from hardware */ int button_read_device(void) { int btn = BUTTON_NONE; short dbop = button_read_dbop(); static unsigned power_counter = 0; /* hold button */ if(dbop & (1<<12)) { power_counter = HZ; hold_button = true; } else { hold_button = false; /* read power on bit 8, but not if hold button was just released, since * you basically always hit power due to the slider mechanism after releasing * hold (wait ~1 sec) */ if (power_counter) power_counter--; if (!power_counter && dbop & (1<<8)) btn |= BUTTON_POWER; /* read home on bit 15 */ if (!(dbop & (1<<15))) btn |= BUTTON_HOME; btn |= button_gpio(); } #ifndef BOOTLOADER /* light handling */ if (hold_button != hold_button_old) { hold_button_old = hold_button; backlight_hold_changed(hold_button); } #endif /* BOOTLOADER */ return btn; }