osd-contiki/platform/z1/dev/reed-sensor.c

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2015-03-25 13:51:50 +01:00
/*
* Copyright (c) 2015, Zolertia <http://www.zolertia.com>
* 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.
*
*/
/**
* \file
* Reed sensor driver file
* \author
* Antonio Lignan <alinan@zolertia.com>
*/
#include "contiki.h"
#include "lib/sensors.h"
#include "dev/reed-sensor.h"
#include "sys/process.h"
#include "sys/ctimer.h"
/*---------------------------------------------------------------------------*/
#ifndef REED_CHECK_PERIOD
#define REED_CHECK_PERIOD CLOCK_SECOND
#endif
/*---------------------------------------------------------------------------*/
static int current_status = -1;
static struct ctimer change_timer;
process_event_t reed_sensor_event_changed;
/*---------------------------------------------------------------------------*/
static int
status(int type)
{
switch(type) {
case SENSORS_ACTIVE:
case SENSORS_READY:
return ~(REED_PORT_DIR & REED_READ_PIN);
}
return REED_SENSOR_ERROR;
}
/*---------------------------------------------------------------------------*/
static int
value(int type)
{
if((!status(SENSORS_ACTIVE)) || (type != REED_SENSOR_VAL)) {
return REED_SENSOR_ERROR;
}
return (REED_PORT_READ & REED_READ_PIN) ? REED_CLOSED : REED_OPEN;
}
/*---------------------------------------------------------------------------*/
static void
check_callback(void *data)
{
static int new_status;
if(current_status == -1) {
ctimer_stop(&change_timer);
return;
}
new_status = value(REED_SENSOR_VAL);
if(new_status != current_status) {
current_status = new_status;
process_post(PROCESS_BROADCAST, reed_sensor_event_changed, &current_status);
}
ctimer_reset(&change_timer);
}
/*---------------------------------------------------------------------------*/
static int
configure(int type, int c)
{
switch(type) {
case SENSORS_ACTIVE:
if(c) {
if(!status(SENSORS_ACTIVE)) {
REED_PORT_SEL |= REED_READ_PIN;
REED_PORT_DIR &= ~REED_READ_PIN;
REED_PORT_REN |= REED_READ_PIN;
REED_PORT_PRES |= REED_READ_PIN;
}
} else {
REED_PORT_DIR |= REED_READ_PIN;
REED_PORT_REN &= ~REED_READ_PIN;
}
return REED_SENSOR_SUCCESS;
case REED_SENSOR_MODE:
if(c == REED_SENSOR_EVENT_MODE) {
current_status = value(REED_SENSOR_VAL);
ctimer_set(&change_timer, REED_CHECK_PERIOD, check_callback, NULL);
} else if(c == REED_SENSOR_EVENT_POLL) {
current_status = -1;
ctimer_stop(&change_timer);
} else {
return REED_SENSOR_ERROR;
}
return REED_SENSOR_SUCCESS;
}
return REED_SENSOR_ERROR;
}
/*---------------------------------------------------------------------------*/
SENSORS_SENSOR(reed_sensor, REED_SENSOR, value, configure, status);