dccdce6c3c
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@20791 a1c6a512-1295-4272-9138-f99709370657
100 lines
2.5 KiB
C
100 lines
2.5 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) 2008 by ??
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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 "config.h"
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#include "cpu.h"
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#include "button.h"
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void button_init_device(void)
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{
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GPIOA_DIR &= ~((1<<3) | (1<<2) | (1<<1) | (1<<0)); /* A3-A0 is input */
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GPIOA_DIR |= ((1<<6) | (1<<5) | (1<<4)); /* A4-A6 row outputs */
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}
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/* short delay is needed between raising a colum pin, and reading the row pin. values is arbitraty */
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static inline void btn_delay(void) { int i = 5; while(i--) ; }
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int button_read_device(void)
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{
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int result = BUTTON_NONE;
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if(button_hold())
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return result;
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/* direct GPIO connections */
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if (GPIOA_PIN(3))
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result |= BUTTON_POWER;
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/* This is a keypad using A4-A6 as columns and A0-A2 as rows */
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GPIOA_PIN(4) = (1<<4);
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btn_delay();
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/* A4A0 is unused */
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if (GPIOA_PIN(1))
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result |= BUTTON_VOL_DOWN;
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if (GPIOA_PIN(2))
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result |= BUTTON_UP;
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GPIOA_PIN(4) = 0x00;
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GPIOA_PIN(5) = (1<<5);
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btn_delay();
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if (GPIOA_PIN(0))
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result |= BUTTON_LEFT;
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if (GPIOA_PIN(1))
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result |= BUTTON_SELECT;
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if (GPIOA_PIN(2))
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result |= BUTTON_RIGHT;
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GPIOA_PIN(5) = 0x00;
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GPIOA_PIN(6) = (1<<6);
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btn_delay();
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if (GPIOA_PIN(0))
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result |= BUTTON_DOWN;
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if (GPIOA_PIN(1))
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result |= BUTTON_VOL_UP;
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/* hold button is read in button_hold() */
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GPIOA_PIN(6) = 0x00;
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return result;
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}
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bool button_hold(void)
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{
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bool ret = false;
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GPIOA_PIN(6) = (1<<6);
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if (GPIOA_PIN(2))
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ret = true;
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GPIOA_PIN(6) = 0x00;
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return ret;
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}
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