426cdb1284
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@21253 a1c6a512-1295-4272-9138-f99709370657
128 lines
3.3 KiB
C
128 lines
3.3 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 Bertrik Sikken
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* Copyright (C) 2008 François Dinel
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* Copyright (C) 2008 Rafaël Carré
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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 "button-target.h"
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#include "as3525.h"
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/* The Sansa Clip uses a button matrix that is scanned by selecting one of
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three rows and reading back the button states from the columns.
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In this driver, the row is changed at each call (i.e. once per tick).
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In one tick, column data from one row is read back and then the next row
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is selected for the following tick. This mechanism ensures that there is
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plenty time between selecting a row and reading the columns, avoiding the
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need for explicit delays.
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*/
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void button_init_device(void)
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{
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GPIOA_DIR &= ~((1<<7) | (1<<3));
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GPIOB_DIR &= ~((1<<2) | (1<<1) | (1<<0));
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GPIOC_PIN(4) = 0;
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GPIOC_PIN(5) = 0;
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GPIOC_PIN(6) = 0;
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GPIOC_DIR |= ((1<<6) | (1<<5) | (1<<4));
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/* get initial readings */
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button_read_device();
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button_read_device();
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button_read_device();
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}
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int button_read_device(void)
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{
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static int row = 0;
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static int buttons = 0;
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if(button_hold())
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return 0;
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/* direct GPIO connections */
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if (GPIOA_PIN(7))
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buttons |= BUTTON_POWER;
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else
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buttons &= ~BUTTON_POWER;
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/* This is a keypad using C4-C6 as columns and B0-B2 as rows */
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switch (row) {
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case 0:
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buttons &= ~(BUTTON_VOL_UP | BUTTON_UP);
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(void)GPIOB_PIN(0); /* C4B0 is unused */
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if (GPIOB_PIN(1))
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buttons |= BUTTON_VOL_UP;
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if (GPIOB_PIN(2))
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buttons |= BUTTON_UP;
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GPIOC_PIN(4) = 0;
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GPIOC_PIN(5) = (1<<5);
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row++;
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break;
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case 1:
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buttons &= ~(BUTTON_LEFT | BUTTON_SELECT | BUTTON_RIGHT);
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if (GPIOB_PIN(0))
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buttons |= BUTTON_LEFT;
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if (GPIOB_PIN(1))
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buttons |= BUTTON_SELECT;
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if (GPIOB_PIN(2))
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buttons |= BUTTON_RIGHT;
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GPIOC_PIN(5) = 0;
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GPIOC_PIN(6) = (1<<6);
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row++;
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break;
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case 2:
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buttons &= ~(BUTTON_DOWN | BUTTON_VOL_DOWN | BUTTON_HOME);
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if (GPIOB_PIN(0))
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buttons |= BUTTON_DOWN;
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if (GPIOB_PIN(1))
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buttons |= BUTTON_VOL_DOWN;
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if (GPIOB_PIN(2))
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buttons |= BUTTON_HOME;
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GPIOC_PIN(6) = 0;
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GPIOC_PIN(4) = (1<<4);
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default:
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row = 0;
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break;
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}
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return buttons;
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}
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bool button_hold(void)
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{
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return (GPIOA_PIN(3) != 0);
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}
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