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.
*
* @(#)$Id: button-sensor.c,v 1.3 2006/06/18 08:07:31 adamdunkels Exp $
*/
#include "contiki-esb.h"
const struct sensors_sensor button_sensor;
static struct timer debouncetimer;
HWCONF_PIN(BUTTON, 2, 7);
HWCONF_IRQ(BUTTON, 2, 7);
/*---------------------------------------------------------------------------*/
static void
init(void)
{
timer_set(&debouncetimer, 0);
BUTTON_IRQ_EDGE_SELECTD();
BUTTON_SELECT();
BUTTON_MAKE_INPUT();
}
/*---------------------------------------------------------------------------*/
static int
irq(void)
{
if(BUTTON_CHECK_IRQ()) {
if(timer_expired(&debouncetimer)) {
timer_set(&debouncetimer, CLOCK_SECOND / 4);
sensors_changed(&button_sensor);
return 1;
}
}
return 0;
}
/*---------------------------------------------------------------------------*/
static void
activate(void)
{
sensors_add_irq(&button_sensor, BUTTON_IRQ_PORT());
BUTTON_ENABLE_IRQ();
}
/*---------------------------------------------------------------------------*/
static void
deactivate(void)
{
BUTTON_DISABLE_IRQ();
sensors_remove_irq(&button_sensor, BUTTON_IRQ_PORT());
}
/*---------------------------------------------------------------------------*/
static int
active(void)
{
return BUTTON_IRQ_ENABLED();
}
/*---------------------------------------------------------------------------*/
static unsigned int
value(int type)
{
return BUTTON_READ() || !timer_expired(&debouncetimer);
}
/*---------------------------------------------------------------------------*/
static int
configure(int type, void *c)
{
return 0;
}
/*---------------------------------------------------------------------------*/
static void *
status(int type)
{
return NULL;
}
/*---------------------------------------------------------------------------*/
SENSORS_SENSOR(button_sensor, BUTTON_SENSOR,
init, irq, activate, deactivate, active,
value, configure, status);