Contiki-NG
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reed-sensor.c
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1/*
2 * Copyright (c) 2015, Zolertia <http://www.zolertia.com>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of the Institute nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 * This file is part of the Contiki operating system.
30 *
31 */
32/**
33 * \file
34 * Reed sensor driver file
35 * \author
36 * Antonio Lignan <alinan@zolertia.com>
37 */
38
39#include "contiki.h"
40#include "lib/sensors.h"
41#include "dev/reed-sensor.h"
42#include "sys/process.h"
43#include "sys/ctimer.h"
44/*---------------------------------------------------------------------------*/
45#ifndef REED_CHECK_PERIOD
46#define REED_CHECK_PERIOD CLOCK_SECOND
47#endif
48/*---------------------------------------------------------------------------*/
49static int current_status = -1;
50static struct ctimer change_timer;
51process_event_t reed_sensor_event_changed;
52/*---------------------------------------------------------------------------*/
53static int
54status(int type)
55{
56 switch(type) {
57 case SENSORS_ACTIVE:
58 case SENSORS_READY:
59 return ~(REED_PORT_DIR & REED_READ_PIN);
60 }
61 return REED_SENSOR_ERROR;
62}
63/*---------------------------------------------------------------------------*/
64static int
65value(int type)
66{
67 if((!status(SENSORS_ACTIVE)) || (type != REED_SENSOR_VAL)) {
68 return REED_SENSOR_ERROR;
69 }
70 return (REED_PORT_READ & REED_READ_PIN) ? REED_CLOSED : REED_OPEN;
71}
72/*---------------------------------------------------------------------------*/
73static void
74check_callback(void *data)
75{
76 static int new_status;
77 if(current_status == -1) {
78 ctimer_stop(&change_timer);
79 return;
80 }
81
82 new_status = value(REED_SENSOR_VAL);
83 if(new_status != current_status) {
84 current_status = new_status;
85 process_post(PROCESS_BROADCAST, reed_sensor_event_changed, &current_status);
86 }
87 ctimer_reset(&change_timer);
88}
89/*---------------------------------------------------------------------------*/
90static int
91configure(int type, int c)
92{
93 switch(type) {
94 case SENSORS_ACTIVE:
95 if(c) {
96 if(!status(SENSORS_ACTIVE)) {
97 REED_PORT_SEL |= REED_READ_PIN;
98 REED_PORT_DIR &= ~REED_READ_PIN;
99 REED_PORT_REN |= REED_READ_PIN;
100 REED_PORT_PRES |= REED_READ_PIN;
101 }
102 } else {
103 REED_PORT_DIR |= REED_READ_PIN;
104 REED_PORT_REN &= ~REED_READ_PIN;
105 }
106 return REED_SENSOR_SUCCESS;
107 case REED_SENSOR_MODE:
108 if(c == REED_SENSOR_EVENT_MODE) {
109 current_status = value(REED_SENSOR_VAL);
110 ctimer_set(&change_timer, REED_CHECK_PERIOD, check_callback, NULL);
111 } else if(c == REED_SENSOR_EVENT_POLL) {
112 current_status = -1;
113 ctimer_stop(&change_timer);
114 } else {
115 return REED_SENSOR_ERROR;
116 }
117 return REED_SENSOR_SUCCESS;
118 }
119 return REED_SENSOR_ERROR;
120}
121/*---------------------------------------------------------------------------*/
122SENSORS_SENSOR(reed_sensor, REED_SENSOR, value, configure, status);
ctimer.h
Header file for the callback timer.
ctimer_stop
void ctimer_stop(struct ctimer *c)
Stop a pending callback timer.
Definition ctimer.c:138
ctimer_reset
void ctimer_reset(struct ctimer *c)
Reset a callback timer with the same interval as was previously set.
Definition ctimer.c:114
ctimer_set
static void ctimer_set(struct ctimer *c, clock_time_t t, void(*f)(void *), void *ptr)
Set a callback timer.
Definition ctimer.h:137
process_post
int process_post(struct process *p, process_event_t ev, process_data_t data)
Post an asynchronous event.
Definition process.c:325
process.h
Header file for the Contiki process interface.
reed-sensor.h
Header file for the reed sensor.