rockbox/firmware/target/arm/rk27xx/ma/button-ma.c

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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2013 Andrew Ryabinin
*
* 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 "system.h"
#include "button.h"
#include "adc.h"
#include "backlight.h"
#include "pca9555.h"
extern unsigned short pca9555_in_ports;
/* upper bounds of key's voltage values */
#define ADV_KEYUP 0x05B + 0x10
#define ADV_KEYDOWN 0x0F3 + 0x10
#define ADV_KEYLEFT 0x190 + 0x10
#define ADV_KEYRIGHT 0x22C + 0x10
#define ADV_KEYMENU 0x2CA + 0x10
void button_init_device(void) {
GPIO_PCCON &= ~(1<<1);
pca9555_init();
}
int button_read_device(void) {
int adc_val = adc_read(ADC_BUTTONS);
int button = 0;
if (adc_val < ADV_KEYLEFT) {
if (adc_val < ADV_KEYDOWN) {
if (adc_val < ADV_KEYUP) {
button = BUTTON_UP;
} else {
button = BUTTON_DOWN;
}
} else {
button = BUTTON_LEFT;
}
} else {
if (adc_val < ADV_KEYRIGHT) {
button = BUTTON_RIGHT;
} else if (adc_val < ADV_KEYMENU) {
button = BUTTON_MENU;
}
}
if (GPIO_PCDR & (1<<1)) {
button |= BUTTON_PLAY;
}
if (((GPIO_PFDR&(1<<2)) == 0) &&
((pca9555_in_ports & (1<<15)) == 0)) {
button |= BUTTON_BACK;
}
return button;
}