examples/esb/beeper.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  * @(#)$Id: beeper.c,v 1.2 2008/07/08 12:54:41 nifi Exp $
  32  */
  33 #include "contiki-esb.h"
  34
  35 PROCESS(beeper_process, "Beeper");
  36
  37 AUTOSTART_PROCESSES(&beeper_process);
  38
  39 static struct etimer etimer;
  40
  41 static struct pt beeper_pt;
  42
  43 static
  44 PT_THREAD(beeper_thread(struct pt *pt))
  45 {
  46   PT_BEGIN(pt);
  47
  48   while(1) {
  49     PT_WAIT_UNTIL(pt, etimer_expired(&etimer));
  50     etimer_reset(&etimer);
  51     leds_invert(LEDS_RED);
  52     beep();
  53
  54     PT_WAIT_UNTIL(pt, etimer_expired(&etimer));
  55     etimer_reset(&etimer);
  56     leds_invert(LEDS_RED);
  57   }
  58
  59   PT_END(pt);
  60 }
  61
  62 PROCESS_THREAD(beeper_process, ev, data)
  63 {
  64   PROCESS_EXITHANDLER(goto exit);
  65   PROCESS_BEGIN();
  66
  67   etimer_set(&etimer, CLOCK_SECOND / 2);
  68   PT_INIT(&beeper_pt);
  69
  70   button_sensor.activate();
  71
  72   while(1) {
  73
  74     beeper_thread(&beeper_pt);
  75
  76     PROCESS_WAIT_EVENT();
  77
  78     if(ev == sensors_event && data == &button_sensor) {
  79       leds_invert(LEDS_YELLOW);
  80     }
  81
  82   }
  83  exit:
  84   ;
  85   PROCESS_END();
  86 }