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buttons.c
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buttons.c
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/*! \file buttons.c */
//*****************************************************************************
// Author : Christian Illy
// Created : 20.04.2009
// Revised : 04.06.2009
// Version : 0.1
// Target MCU : Fujitsu MB96300 series
//
// 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 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
//
//*****************************************************************************
#include "mb96348hs.h"
#include "buttons.h"
#include "buttons.cfg.h"
void buttons_init(void) {
BUTTONS_PORT = 0x00;
BUTTONS_DDR = ~(BUTTON_MASK);
BUTTONS_PIER = BUTTON_MASK;
}
int8_t buttons_get(uint8_t pin) {
if (_BV(pin) & BUTTON_MASK)
return ((~BUTTONS_PORT) & _BV(pin)) >> pin;
return -1;
}
int8_t buttons_event(uint8_t pin) {
static uint8_t buttonState = 0xff;
if (_BV(pin) & BUTTON_MASK) {
uint8_t s = buttons_get(pin);
if (s != ((buttonState >> pin) & 1)) {
buttonState &= ~(1 << pin);
buttonState |= s << pin;
if (s == 1)
return 1;
}
return 0;
}
return -1;
}