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/*
* spreadspace avr utils
*
*
* Copyright (C) 2013-2014 Christian Pointner <equinox@spreadspace.org>
* Othmar Gsenger <otti@wirdorange.org>
*
* This file is part of spreadspace avr utils.
*
* spreadspace avr utils 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
* any later version.
*
* spreadspace avr utils 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 spreadspace avr utils. If not, see <http://www.gnu.org/licenses/>.
*/
#include <avr/io.h>
#include <stdio.h>
#include "ajar.h"
#define AJAR_PIN PINC
#define AJAR_PORT PORTC
#define AJAR_DDR DDRC
#define AJAR_BIT 7
#define AJAR_LP_MAX 20000
void ajar_init(void)
{
AJAR_DDR = AJAR_DDR & ~(1<<AJAR_BIT);
AJAR_PORT |= (1<<AJAR_BIT);
}
ajar_t ajar_get(void)
{
static uint8_t last_state = (1<<AJAR_BIT);
static uint16_t lp_cnt = 0;
uint8_t state = AJAR_PIN & (1<<AJAR_BIT);
if(state != last_state)
lp_cnt++;
else
lp_cnt += lp_cnt ? -1 : 0;
if(lp_cnt >= AJAR_LP_MAX) {
last_state = state;
lp_cnt = 0;
}
if(last_state)
return ajar;
return shut;
}
const char* ajar_to_string(ajar_t a)
{
return a == ajar ? "ajar" : "shut";
}
void ajar_task(void)
{
static ajar_t last_state = shut;
ajar_t state = ajar_get();
if(last_state != state)
printf("Info(ajar): door is now %s\r\n", ajar_to_string(state));
last_state = state;
}
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