73 lines
1.7 KiB
C
73 lines
1.7 KiB
C
/*
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* ringlock.c
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*
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* Created on: Sep 28, 2011
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* Author: sebastian
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*
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* This file is part of the RingLock-library for Atmel AVR MCUS.
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*
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* RingLock is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* RingLock is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with RingLock. If not, see <http://www.gnu.org/licenses/>.
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*
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* Copyright Sebastian Schumb (sebastian_at_sebastians-site_de) 2011
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*/
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#include "ringlock.h"
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void rl_init(void) {
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//Setting up pin to pass on the token
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RL_OUT_DDR |= (1 << RL_OUT);
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RL_OUT_PORT &= ~(1 << RL_OUT);
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//Setting up the interrupt use to receive the token
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RL_INT_DDR &= ~(1 << RL_INT_PIN);
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RL_INT_CONFIG |= RL_INT_CBITS;
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RL_INT_ENABLE |= (1 << RL_INT_EBITS);
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rl_request_token = 0;
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#ifdef RL_MASTER
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rl_have_token = 1; //Master haz the token
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rl_to_setup(); //Fire up the timer
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rl_to_start();
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#else
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rl_have_token = 0;
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#endif
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}
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/*
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* Interrupt used for getting the token and timeout
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*/
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ISR(RL_INT) {
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rl_have_token = 1;
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if(!rl_request_token) {
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rl_release_lock();
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}
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else {
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rl_request_token = 0;
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}
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#ifdef RL_MASTER
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rl_to_reset(); // reset the timeout
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#endif
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}
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#ifdef RL_MASTER
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ISR(RL_TO_INT, ISR_ALIASOF(RL_INT)); // if we have a timeout,
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// we just pretend to have the token
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#endif
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