Contiki-NG
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 
39 const struct sensors_sensor button_sensor;
40 
41 static struct timer debouncetimer;
42 static int status(int type);
43 
44 HWCONF_PIN(BUTTON, 2, 5);
45 HWCONF_IRQ(BUTTON, 2, 5);
46 
47 /*---------------------------------------------------------------------------*/
48 ISR(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 /*---------------------------------------------------------------------------*/
60 static int
61 value(int type)
62 {
63  return BUTTON_READ() || !timer_expired(&debouncetimer);
64 }
65 /*---------------------------------------------------------------------------*/
66 static int
67 configure(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 /*---------------------------------------------------------------------------*/
89 static int
90 status(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 /*---------------------------------------------------------------------------*/
100 SENSORS_SENSOR(button_sensor, BUTTON_SENSOR,
101  value, configure, status);
SENSORS & button_sensor
Exports global symbols for the sensor API.
Definition: z1-sensors.c:46
void timer_set(struct timer *t, clock_time_t interval)
Set a timer.
Definition: timer.c:64
static int value(int type, nrf_drv_gpiote_pin_t pin)
Return current state of a button.
A timer.
Definition: timer.h:82
#define CLOCK_SECOND
A second, measured in system clock time.
Definition: clock.h:82
int timer_expired(struct timer *t)
Check if a timer has expired.
Definition: timer.c:123
static int status(int type, nrf_drv_gpiote_pin_t pin)
Get status of a given button.