74 lines
2.5 KiB
C
74 lines
2.5 KiB
C
/*
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* Copyright (c) 2006, Swedish Institute of Computer Science
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)$Id: button.c,v 1.2 2006/08/17 15:41:13 bg- Exp $
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*/
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#include "contiki.h"
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#include "dev/button.h"
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#define BUTTON_PORT 2
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#define BUTTON_PIN 7
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static struct button_msg button_msg;
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static struct process *selecting_proc;
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void
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button_init(struct process *proc)
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{
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button_msg.type = BUTTON_MSG_TYPE;
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P2DIR &= ~BV(BUTTON_PIN);
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P2SEL &= ~BV(BUTTON_PIN);
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P2IES |= BV(BUTTON_PIN);
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P2IFG &= ~BV(BUTTON_PIN);
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selecting_proc = proc;
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if(proc != NULL)
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P2IE |= BV(BUTTON_PIN);
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else
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P2IE &= ~BV(BUTTON_PIN);
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}
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interrupt(PORT2_VECTOR)
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__button_interrupt(void)
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{
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static struct timer debouncetimer;
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P2IFG &= ~BV(BUTTON_PIN);
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if(timer_expired(&debouncetimer)) {
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button_msg.value = P2IN & BV(BUTTON_PIN);
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timer_set(&debouncetimer, CLOCK_SECOND/4);
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if(selecting_proc != NULL) {
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process_post(selecting_proc, PROCESS_EVENT_MSG, &button_msg);
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}
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LPM4_EXIT;
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}
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}
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