nes-proj/drivers/platform/wismote/dev/button-sensor.c

102 lines
3.2 KiB
C

/*
* Copyright (c) 2011, 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.
*/
#include "lib/sensors.h"
#include "dev/hwconf.h"
#include "dev/button-sensor.h"
#include "isr_compat.h"
const struct sensors_sensor button_sensor;
static struct timer debouncetimer;
static int status(int type);
HWCONF_PIN(BUTTON, 2, 7);
HWCONF_IRQ(BUTTON, 2, 7);
/*---------------------------------------------------------------------------*/
ISR(PORT2, irq_p2)
{
ENERGEST_ON(ENERGEST_TYPE_IRQ);
if(BUTTON_CHECK_IRQ() && timer_expired(&debouncetimer)) {
timer_set(&debouncetimer, CLOCK_SECOND / 4);
sensors_changed(&button_sensor);
LPM4_EXIT;
}
P2IFG = 0x00;
ENERGEST_OFF(ENERGEST_TYPE_IRQ);
}
/*---------------------------------------------------------------------------*/
static int
value(int type)
{
return BUTTON_READ() || !timer_expired(&debouncetimer);
}
/*---------------------------------------------------------------------------*/
static int
configure(int type, int value)
{
if(type == SENSORS_ACTIVE) {
if(value == 0) {
/* Deactivate button sensor */
BUTTON_DISABLE_IRQ();
} else {
/* Activate button sensor */
if(!status(SENSORS_ACTIVE)) {
timer_set(&debouncetimer, 0);
BUTTON_IRQ_EDGE_SELECTD();
BUTTON_SELECT();
BUTTON_MAKE_INPUT();
BUTTON_ENABLE_IRQ();
}
}
return 1;
}
return 0;
}
/*---------------------------------------------------------------------------*/
static int
status(int type)
{
switch(type) {
case SENSORS_ACTIVE:
case SENSORS_READY:
return BUTTON_IRQ_ENABLED();
default:
return 0;
}
}
/*---------------------------------------------------------------------------*/
SENSORS_SENSOR(button_sensor, BUTTON_SENSOR,
value, configure, status);