osd-contiki/platform/esb/dev/button-sensor.c

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/*
* Copyright (c) 2005, 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.
*
* This file is part of the Contiki operating system.
*
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* @(#)$Id: button-sensor.c,v 1.5 2010/02/08 00:00:45 nifi Exp $
*/
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#include "dev/button-sensor.h"
#include "dev/hwconf.h"
#include <signal.h>
const struct sensors_sensor button_sensor;
static struct timer debouncetimer;
HWCONF_PIN(BUTTON, 2, 7);
HWCONF_IRQ(BUTTON, 2, 7);
/*---------------------------------------------------------------------------*/
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interrupt(PORT2_VECTOR)
irq_p2(void)
{
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ENERGEST_ON(ENERGEST_TYPE_IRQ);
if(BUTTON_CHECK_IRQ()) {
if(timer_expired(&debouncetimer)) {
timer_set(&debouncetimer, CLOCK_SECOND / 4);
sensors_changed(&button_sensor);
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LPM4_EXIT;
}
}
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P2IFG = 0x00;
ENERGEST_OFF(ENERGEST_TYPE_IRQ);
}
/*---------------------------------------------------------------------------*/
static int
value(int type)
{
return BUTTON_READ() || !timer_expired(&debouncetimer);
}
/*---------------------------------------------------------------------------*/
static int
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configure(int type, int value)
{
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switch(type) {
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case SENSORS_HW_INIT:
BUTTON_IRQ_EDGE_SELECTD();
BUTTON_SELECT();
BUTTON_MAKE_INPUT();
return 1;
case SENSORS_ACTIVE:
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if(value) {
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if(!BUTTON_IRQ_ENABLED()) {
timer_set(&debouncetimer, 0);
BUTTON_ENABLE_IRQ();
}
} else {
BUTTON_DISABLE_IRQ();
}
return 1;
}
return 0;
}
/*---------------------------------------------------------------------------*/
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static int
status(int type)
{
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switch(type) {
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case SENSORS_ACTIVE:
case SENSORS_READY:
return BUTTON_IRQ_ENABLED();
}
return 0;
}
/*---------------------------------------------------------------------------*/
SENSORS_SENSOR(button_sensor, BUTTON_SENSOR,
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value, configure, status);