123 lines
4.2 KiB
C
123 lines
4.2 KiB
C
/*
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* Copyright (c) 2015, Zolertia <http://www.zolertia.com>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* This file is part of the Contiki operating system.
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*
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*/
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/**
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* \file
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* Reed sensor driver file
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* \author
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* Antonio Lignan <alinan@zolertia.com>
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*/
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#include "contiki.h"
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#include "lib/sensors.h"
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#include "dev/reed-sensor.h"
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#include "sys/process.h"
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#include "sys/ctimer.h"
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/*---------------------------------------------------------------------------*/
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#ifndef REED_CHECK_PERIOD
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#define REED_CHECK_PERIOD CLOCK_SECOND
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#endif
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/*---------------------------------------------------------------------------*/
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static int current_status = -1;
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static struct ctimer change_timer;
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process_event_t reed_sensor_event_changed;
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/*---------------------------------------------------------------------------*/
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static int
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status(int type)
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{
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switch(type) {
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case SENSORS_ACTIVE:
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case SENSORS_READY:
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return ~(REED_PORT_DIR & REED_READ_PIN);
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}
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return REED_SENSOR_ERROR;
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}
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/*---------------------------------------------------------------------------*/
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static int
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value(int type)
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{
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if((!status(SENSORS_ACTIVE)) || (type != REED_SENSOR_VAL)) {
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return REED_SENSOR_ERROR;
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}
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return (REED_PORT_READ & REED_READ_PIN) ? REED_CLOSED : REED_OPEN;
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}
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/*---------------------------------------------------------------------------*/
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static void
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check_callback(void *data)
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{
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static int new_status;
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if(current_status == -1) {
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ctimer_stop(&change_timer);
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return;
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}
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new_status = value(REED_SENSOR_VAL);
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if(new_status != current_status) {
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current_status = new_status;
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process_post(PROCESS_BROADCAST, reed_sensor_event_changed, ¤t_status);
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}
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ctimer_reset(&change_timer);
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}
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/*---------------------------------------------------------------------------*/
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static int
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configure(int type, int c)
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{
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switch(type) {
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case SENSORS_ACTIVE:
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if(c) {
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if(!status(SENSORS_ACTIVE)) {
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REED_PORT_SEL |= REED_READ_PIN;
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REED_PORT_DIR &= ~REED_READ_PIN;
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REED_PORT_REN |= REED_READ_PIN;
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REED_PORT_PRES |= REED_READ_PIN;
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}
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} else {
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REED_PORT_DIR |= REED_READ_PIN;
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REED_PORT_REN &= ~REED_READ_PIN;
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}
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return REED_SENSOR_SUCCESS;
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case REED_SENSOR_MODE:
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if(c == REED_SENSOR_EVENT_MODE) {
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current_status = value(REED_SENSOR_VAL);
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ctimer_set(&change_timer, REED_CHECK_PERIOD, check_callback, NULL);
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} else if(c == REED_SENSOR_EVENT_POLL) {
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current_status = -1;
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ctimer_stop(&change_timer);
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} else {
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return REED_SENSOR_ERROR;
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}
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return REED_SENSOR_SUCCESS;
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}
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return REED_SENSOR_ERROR;
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}
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/*---------------------------------------------------------------------------*/
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SENSORS_SENSOR(reed_sensor, REED_SENSOR, value, configure, status);
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