nes-proj/platform/esb/apps/fader.c

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