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/*
* spreadspace avr utils
*
*
* Copyright (C) 2013 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 "limits.h"
#define LIMITS_PIN PINC
#define LIMITS_PORT PORTC
#define LIMITS_DDR DDRC
#define LIMITS_OPEN 6
#define LIMITS_CLOSE 7
#define LIMITS_LP_MAX 255
void limits_init(void)
{
LIMITS_DDR = LIMITS_DDR & ~(1<<LIMITS_OPEN | 1<<LIMITS_CLOSE);
LIMITS_PORT |= (1<<LIMITS_OPEN | 1<<LIMITS_CLOSE);
}
uint8_t limits_get_close(uint8_t pin)
{
static uint8_t last_state = 1<<LIMITS_CLOSE;
static uint8_t lp_cnt = 0;
uint8_t state = pin & (1<<LIMITS_CLOSE);
if(state != last_state)
lp_cnt++;
else
lp_cnt += lp_cnt ? -1 : 0;
if(lp_cnt >= LIMITS_LP_MAX) {
last_state = state;
lp_cnt = 0;
}
return last_state;
}
uint8_t limits_get_open(uint8_t pin)
{
static uint8_t last_state = 1<<LIMITS_OPEN;
static uint8_t lp_cnt = 0;
uint8_t state = pin & (1<<LIMITS_OPEN);
if(state != last_state)
lp_cnt++;
else
lp_cnt += lp_cnt ? -1 : 0;
if(lp_cnt >= LIMITS_LP_MAX) {
last_state = state;
lp_cnt = 0;
}
return last_state;
}
limits_t limits_get(void)
{
uint8_t tmp = LIMITS_PIN & (1<<LIMITS_OPEN | 1<<LIMITS_CLOSE);
if(!limits_get_open(tmp)) {
if(limits_get_close(tmp))
return open;
else
return both;
}
else if(!limits_get_close(tmp))
return close;
return moving;
}
const char* limits_to_string(limits_t limits)
{
switch(limits) {
case moving: return "...";
case open: return "opened";
case close: return "closed";
case both: return "error";
}
return "invalid"; // gcc - shut the fuck up!!!
}
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