138 lines
3.9 KiB
C
138 lines
3.9 KiB
C
/*
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* Copyright (c) 2005, Swedish Institute of Computer Science.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* This file is part of the Contiki operating system.
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*
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* Author: Adam Dunkels <adam@sics.se>
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*
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* $Id: fader.c,v 1.1 2006/06/18 07:48:48 adamdunkels Exp $
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*/
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#include "contiki-esb.h"
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PROCESS(fader_process, "LED fader");
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AUTOSTART_PROCESSES(&fader_process);
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#define ON 1
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#define OFF 0
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static unsigned char onoroff;
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static struct etimer etimer;
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static struct pt fade_pt, fade_in_pt, fade_out_pt;
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/*---------------------------------------------------------------------------*/
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static
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PT_THREAD(fade_in(struct pt *pt))
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{
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static int delay;
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PT_BEGIN(pt);
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for(delay = 3980; delay > 20; delay -= 20) {
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leds_on(LEDS_ALL);
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clock_delay(4000 - delay);
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leds_off(LEDS_ALL);
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clock_delay(delay);
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PT_YIELD(pt);
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}
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PT_END(pt);
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}
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/*---------------------------------------------------------------------------*/
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static
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PT_THREAD(fade_out(struct pt *pt))
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{
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static int delay;
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PT_BEGIN(pt);
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for(delay = 20; delay < 3980; delay += 20) {
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leds_on(LEDS_ALL);
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clock_delay(4000 - delay);
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leds_off(LEDS_ALL);
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clock_delay(delay);
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PT_YIELD(pt);
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}
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PT_END(pt);
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}
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/*---------------------------------------------------------------------------*/
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static
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PT_THREAD(fade(struct pt *pt))
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{
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PT_BEGIN(pt);
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PT_SPAWN(pt, &fade_in_pt, fade_in(&fade_in_pt));
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PT_SPAWN(pt, &fade_out_pt, fade_out(&fade_out_pt));
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etimer_set(&etimer, CLOCK_SECOND * 10);
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PT_WAIT_UNTIL(pt, etimer_expired(&etimer));
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PT_END(pt);
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}
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/*---------------------------------------------------------------------------*/
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PROCESS_THREAD(fader_process, ev, data)
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{
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PROCESS_BEGIN();
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PT_INIT(&fade_pt);
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PT_INIT(&fade_in_pt);
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PT_INIT(&fade_out_pt);
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onoroff = ON;
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etimer_set(&etimer, CLOCK_SECOND * 32);
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while(1) {
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PROCESS_WAIT_EVENT();
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if(ev == PROCESS_EVENT_TIMER) {
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etimer_reset(&etimer);
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PT_INIT(&fade_pt);
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process_poll(&fader_process);
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}
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if(onoroff == ON &&
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PT_SCHEDULE(fade(&fade_pt))) {
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process_poll(&fader_process);
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}
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}
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PROCESS_END();
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}
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/*---------------------------------------------------------------------------*/
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void
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fader_on(void)
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{
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onoroff = ON;
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process_poll(&fader_process);
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}
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/*---------------------------------------------------------------------------*/
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void
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fader_off(void)
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{
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onoroff = OFF;
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}
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/*---------------------------------------------------------------------------*/
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