contiki/cpu/msp430/button.c

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/*
* Copyright (c) 2006, Swedish Institute of Computer Science
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)$Id: button.c,v 1.2 2006/08/17 15:41:13 bg- Exp $
*/
#include "contiki.h"
#include "dev/button.h"
#include "isr_compat.h"
#define BUTTON_PORT 2
#define BUTTON_PIN 7
static struct button_msg button_msg;
static struct process *selecting_proc;
void
button_init(struct process *proc)
{
button_msg.type = BUTTON_MSG_TYPE;
P2DIR &= ~BV(BUTTON_PIN);
P2SEL &= ~BV(BUTTON_PIN);
P2IES |= BV(BUTTON_PIN);
P2IFG &= ~BV(BUTTON_PIN);
selecting_proc = proc;
if(proc != NULL)
P2IE |= BV(BUTTON_PIN);
else
P2IE &= ~BV(BUTTON_PIN);
}
ISR(PORT2, __button_interrupt)
{
static struct timer debouncetimer;
P2IFG &= ~BV(BUTTON_PIN);
if(timer_expired(&debouncetimer)) {
button_msg.value = P2IN & BV(BUTTON_PIN);
timer_set(&debouncetimer, CLOCK_SECOND/4);
if(selecting_proc != NULL) {
process_post(selecting_proc, PROCESS_EVENT_MSG, &button_msg);
}
LPM4_EXIT;
}
}