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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2008 by ??
*
* 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.
*
****************************************************************************/
#include "config.h"
#include "cpu.h"
#include "button.h"
#include "adc.h"
void button_init_device(void)
{
GPIOA_DIR &= ~((1<<3) | (1<<2) | (1<<1) | (1<<0)); /* A3-A0 is input */
GPIOA_DIR |= ((1<<6) | (1<<5) | (1<<4)); /* A4-A6 row outputs */
}
/* short delay is needed between raising a colum pin, and reading the row pin. values is arbitraty */
static inline void btn_delay(void) { int i = 5; while(i--) ; }
int button_read_device(void)
{
int result = BUTTON_NONE;
if(button_hold())
return result;
/* direct GPIO connections */
if (GPIOA_PIN(3))
result |= BUTTON_POWER;
/* This is a keypad using A4-A6 as columns and A0-A2 as rows */
GPIOA_PIN(4) = (1<<4);
btn_delay();
/* A4A0 is unused */
if (GPIOA_PIN(1))
result |= BUTTON_VOL_DOWN;
if (GPIOA_PIN(2))
result |= BUTTON_UP;
GPIOA_PIN(4) = 0x00;
GPIOA_PIN(5) = (1<<5);
btn_delay();
if (GPIOA_PIN(0))
result |= BUTTON_LEFT;
if (GPIOA_PIN(1))
result |= BUTTON_SELECT;
if (GPIOA_PIN(2))
result |= BUTTON_RIGHT;
GPIOA_PIN(5) = 0x00;
GPIOA_PIN(6) = (1<<6);
btn_delay();
if (GPIOA_PIN(0))
result |= BUTTON_DOWN;
if (GPIOA_PIN(1))
result |= BUTTON_VOL_UP;
/* hold button is read in button_hold() */
GPIOA_PIN(6) = 0x00;
return result;
}
bool button_hold(void)
{
bool ret = false;
GPIOA_PIN(6) = (1<<6);
if (GPIOA_PIN(2))
ret = true;
GPIOA_PIN(6) = 0x00;
return ret;
}
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