Contiki 2.5
fader.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  * Author: Adam Dunkels <adam@sics.se>
32  *
33  * $Id: fader.c,v 1.1 2006/06/18 07:48:48 adamdunkels Exp $
34  */
35 
36 #include "contiki-esb.h"
37 
38 PROCESS(fader_process, "LED fader");
39 AUTOSTART_PROCESSES(&fader_process);
40 
41 #define ON 1
42 #define OFF 0
43 
44 static unsigned char onoroff;
45 static struct etimer etimer;
46 static struct pt fade_pt, fade_in_pt, fade_out_pt;
47 /*---------------------------------------------------------------------------*/
48 static
49 PT_THREAD(fade_in(struct pt *pt))
50 {
51  static int delay;
52 
53  PT_BEGIN(pt);
54 
55  for(delay = 3980; delay > 20; delay -= 20) {
56  leds_on(LEDS_ALL);
57  clock_delay(4000 - delay);
58  leds_off(LEDS_ALL);
59  clock_delay(delay);
60  PT_YIELD(pt);
61  }
62 
63  PT_END(pt);
64 }
65 /*---------------------------------------------------------------------------*/
66 static
67 PT_THREAD(fade_out(struct pt *pt))
68 {
69  static int delay;
70 
71  PT_BEGIN(pt);
72 
73  for(delay = 20; delay < 3980; delay += 20) {
74  leds_on(LEDS_ALL);
75  clock_delay(4000 - delay);
76  leds_off(LEDS_ALL);
77  clock_delay(delay);
78  PT_YIELD(pt);
79  }
80 
81  PT_END(pt);
82 }
83 /*---------------------------------------------------------------------------*/
84 static
85 PT_THREAD(fade(struct pt *pt))
86 {
87  PT_BEGIN(pt);
88 
89  PT_SPAWN(pt, &fade_in_pt, fade_in(&fade_in_pt));
90  PT_SPAWN(pt, &fade_out_pt, fade_out(&fade_out_pt));
91 
92  etimer_set(&etimer, CLOCK_SECOND * 10);
93  PT_WAIT_UNTIL(pt, etimer_expired(&etimer));
94 
95  PT_END(pt);
96 }
97 /*---------------------------------------------------------------------------*/
98 PROCESS_THREAD(fader_process, ev, data)
99 {
100  PROCESS_BEGIN();
101 
102  PT_INIT(&fade_pt);
103  PT_INIT(&fade_in_pt);
104  PT_INIT(&fade_out_pt);
105  onoroff = ON;
106  etimer_set(&etimer, CLOCK_SECOND * 32);
107 
108  while(1) {
109  PROCESS_WAIT_EVENT();
110 
111  if(ev == PROCESS_EVENT_TIMER) {
112  etimer_reset(&etimer);
113  PT_INIT(&fade_pt);
114  process_poll(&fader_process);
115  }
116 
117  if(onoroff == ON &&
118  PT_SCHEDULE(fade(&fade_pt))) {
119  process_poll(&fader_process);
120  }
121  }
122  PROCESS_END();
123 }
124 /*---------------------------------------------------------------------------*/
125 void
126 fader_on(void)
127 {
128  onoroff = ON;
129  process_poll(&fader_process);
130 }
131 /*---------------------------------------------------------------------------*/
132 void
133 fader_off(void)
134 {
135  onoroff = OFF;
136 }
137 /*---------------------------------------------------------------------------*/
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