Contiki 2.6
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00001 /* 00002 * Copyright (c) 2005, Swedish Institute of Computer Science. 00003 * All rights reserved. 00004 * 00005 * Redistribution and use in source and binary forms, with or without 00006 * modification, are permitted provided that the following conditions 00007 * are met: 00008 * 1. Redistributions of source code must retain the above copyright 00009 * notice, this list of conditions and the following disclaimer. 00010 * 2. Redistributions in binary form must reproduce the above copyright 00011 * notice, this list of conditions and the following disclaimer in the 00012 * documentation and/or other materials provided with the distribution. 00013 * 3. Neither the name of the Institute nor the names of its contributors 00014 * may be used to endorse or promote products derived from this software 00015 * without specific prior written permission. 00016 * 00017 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND 00018 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 00019 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 00020 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE 00021 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 00022 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 00023 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 00024 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 00025 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 00026 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 00027 * SUCH DAMAGE. 00028 * 00029 * This file is part of the Contiki operating system. 00030 * 00031 * Author: Adam Dunkels <adam@sics.se> 00032 * 00033 * $Id: fader.c,v 1.1 2010/08/24 16:26:38 joxe Exp $ 00034 */ 00035 00036 #include "contiki.h" 00037 #include "dev/leds.h" 00038 00039 PROCESS(fader_process, "LED fader"); 00040 AUTOSTART_PROCESSES(&fader_process); 00041 00042 #define ON 1 00043 #define OFF 0 00044 00045 struct fader { 00046 struct pt fade_pt, fade_in_pt, fade_out_pt; 00047 struct etimer etimer; 00048 int led; 00049 int delay; 00050 }; 00051 00052 static unsigned char onoroff; 00053 00054 /*---------------------------------------------------------------------------*/ 00055 static 00056 PT_THREAD(fade_in(struct fader *f)) 00057 { 00058 PT_BEGIN(&f->fade_in_pt); 00059 00060 for(f->delay = 3980; f->delay > 20; f->delay -= 20) { 00061 leds_on(f->led); 00062 clock_delay(4000 - f->delay); 00063 leds_off(f->led); 00064 clock_delay(f->delay); 00065 PT_YIELD(&f->fade_in_pt); 00066 } 00067 00068 PT_END(&f->fade_in_pt); 00069 } 00070 /*---------------------------------------------------------------------------*/ 00071 static 00072 PT_THREAD(fade_out(struct fader *f)) 00073 { 00074 PT_BEGIN(&f->fade_out_pt); 00075 00076 for(f->delay = 20; f->delay < 3980; f->delay += 20) { 00077 leds_on(f->led); 00078 clock_delay(4000 - f->delay); 00079 leds_off(f->led); 00080 clock_delay(f->delay); 00081 PT_YIELD(&f->fade_out_pt); 00082 } 00083 00084 PT_END(&f->fade_out_pt); 00085 } 00086 /*---------------------------------------------------------------------------*/ 00087 static 00088 PT_THREAD(fade(struct fader *f)) 00089 { 00090 PT_BEGIN(&f->fade_pt); 00091 00092 while(1) { 00093 00094 PT_SPAWN(&f->fade_pt, &f->fade_in_pt, fade_in(f)); 00095 PT_SPAWN(&f->fade_pt, &f->fade_out_pt, fade_out(f)); 00096 00097 etimer_set(&f->etimer, CLOCK_SECOND * 4); 00098 PT_WAIT_UNTIL(&f->fade_pt, etimer_expired(&f->etimer)); 00099 } 00100 00101 PT_END(&f->fade_pt); 00102 } 00103 /*---------------------------------------------------------------------------*/ 00104 static void 00105 init_fader(struct fader *f, int led) 00106 { 00107 PT_INIT(&f->fade_pt); 00108 PT_INIT(&f->fade_in_pt); 00109 PT_INIT(&f->fade_out_pt); 00110 f->led = led; 00111 } 00112 /*---------------------------------------------------------------------------*/ 00113 PROCESS_THREAD(fader_process, ev, data) 00114 { 00115 static struct fader red, green, yellow; 00116 static struct timer timer; 00117 static struct etimer etimer; 00118 00119 PROCESS_BEGIN(); 00120 00121 init_fader(&red, LEDS_RED); 00122 init_fader(&green, LEDS_GREEN); 00123 init_fader(&yellow, LEDS_YELLOW); 00124 00125 timer_set(&timer, CLOCK_SECOND/4); 00126 while(!timer_expired(&timer)) { 00127 PT_SCHEDULE(fade(&red)); 00128 } 00129 timer_set(&timer, CLOCK_SECOND/4); 00130 while(!timer_expired(&timer)) { 00131 PT_SCHEDULE(fade(&red)); 00132 PT_SCHEDULE(fade(&green)); 00133 } 00134 00135 timer_set(&timer, CLOCK_SECOND/4); 00136 while(!timer_expired(&timer)) { 00137 PT_SCHEDULE(fade(&green)); 00138 PT_SCHEDULE(fade(&yellow)); 00139 } 00140 00141 etimer_set(&etimer, CLOCK_SECOND * 4); 00142 fader_on(); 00143 00144 while(1) { 00145 PROCESS_WAIT_EVENT(); 00146 00147 if(ev == PROCESS_EVENT_TIMER) { 00148 etimer_set(&etimer, CLOCK_SECOND * 4); 00149 process_poll(&fader_process); 00150 } 00151 00152 if(onoroff == ON && 00153 PT_SCHEDULE(fade(&red)) && 00154 PT_SCHEDULE(fade(&yellow)) && 00155 PT_SCHEDULE(fade(&green))) { 00156 process_poll(&fader_process); 00157 } 00158 } 00159 PROCESS_END(); 00160 } 00161 /*---------------------------------------------------------------------------*/ 00162 void 00163 fader_on(void) 00164 { 00165 onoroff = ON; 00166 process_poll(&fader_process); 00167 } 00168 /*---------------------------------------------------------------------------*/ 00169 void 00170 fader_off(void) 00171 { 00172 onoroff = OFF; 00173 } 00174 /*---------------------------------------------------------------------------*/