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Diffstat (limited to 'tuer-rfid/limits.c')
-rw-r--r-- | tuer-rfid/limits.c | 103 |
1 files changed, 103 insertions, 0 deletions
diff --git a/tuer-rfid/limits.c b/tuer-rfid/limits.c new file mode 100644 index 0000000..027a3b5 --- /dev/null +++ b/tuer-rfid/limits.c @@ -0,0 +1,103 @@ +/* + * 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!!! +} |