buttons.c

Go to the documentation of this file.

//*****************************************************************************
// 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;
}