Contiki-NG
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button-sensor.c
1/*
2 * Copyright (c) 2005, Swedish Institute of Computer Science
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#include "contiki.h"
34#include "lib/sensors.h"
35#include "dev/hwconf.h"
36#include "dev/button-sensor.h"
37#include "isr_compat.h"
38
39const struct sensors_sensor button_sensor;
40
41static struct timer debouncetimer;
42static int status(int type);
43
44HWCONF_PIN(BUTTON, 2, 5);
45HWCONF_IRQ(BUTTON, 2, 5);
46
47/*---------------------------------------------------------------------------*/
48ISR(PORT2, irq_p2)
49{
50 if(BUTTON_CHECK_IRQ()) {
51 if(timer_expired(&debouncetimer)) {
52 timer_set(&debouncetimer, CLOCK_SECOND / 4);
53 sensors_changed(&button_sensor);
54 LPM4_EXIT;
55 }
56 }
57 P2IFG = 0x00;
58}
59/*---------------------------------------------------------------------------*/
60static int
61value(int type)
62{
63 return BUTTON_READ() || !timer_expired(&debouncetimer);
64}
65/*---------------------------------------------------------------------------*/
66static int
67configure(int type, int c)
68{
69 switch (type) {
70 case SENSORS_ACTIVE:
71 if (c) {
72 if(!status(SENSORS_ACTIVE)) {
73 timer_set(&debouncetimer, 0);
74 BUTTON_IRQ_EDGE_SELECTD();
75
76 BUTTON_SELECT();
77 BUTTON_MAKE_INPUT();
78
79 BUTTON_ENABLE_IRQ();
80 }
81 } else {
82 BUTTON_DISABLE_IRQ();
83 }
84 return 1;
85 }
86 return 0;
87}
88/*---------------------------------------------------------------------------*/
89static int
90status(int type)
91{
92 switch (type) {
93 case SENSORS_ACTIVE:
94 case SENSORS_READY:
95 return BUTTON_IRQ_ENABLED();
96 }
97 return 0;
98}
99/*---------------------------------------------------------------------------*/
100SENSORS_SENSOR(button_sensor, BUTTON_SENSOR,
101 value, configure, status);
#define CLOCK_SECOND
A second, measured in system clock time.
Definition clock.h:103
void timer_set(struct timer *t, clock_time_t interval)
Set a timer.
Definition timer.c:64
bool timer_expired(struct timer *t)
Check if a timer has expired.
Definition timer.c:123
A timer.
Definition timer.h:84