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

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2007-03-21 23:17:28 +00:00
/*
* 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>
*
*/
#include "contiki.h"
#include "dev/leds.h"
PROCESS(fader_process, "LED fader");
AUTOSTART_PROCESSES(&fader_process);
#define ON 1
#define OFF 0
struct fader {
struct pt fade_pt, fade_in_pt, fade_out_pt;
struct etimer etimer;
int led;
int delay;
};
static unsigned char onoroff;
/*---------------------------------------------------------------------------*/
static
PT_THREAD(fade_in(struct fader *f))
{
PT_BEGIN(&f->fade_in_pt);
for(f->delay = 3980; f->delay > 20; f->delay -= 20) {
leds_on(f->led);
clock_delay(4000 - f->delay);
leds_off(f->led);
clock_delay(f->delay);
PT_YIELD(&f->fade_in_pt);
}
PT_END(&f->fade_in_pt);
}
/*---------------------------------------------------------------------------*/
static
PT_THREAD(fade_out(struct fader *f))
{
PT_BEGIN(&f->fade_out_pt);
for(f->delay = 20; f->delay < 3980; f->delay += 20) {
leds_on(f->led);
clock_delay(4000 - f->delay);
leds_off(f->led);
clock_delay(f->delay);
PT_YIELD(&f->fade_out_pt);
}
PT_END(&f->fade_out_pt);
}
/*---------------------------------------------------------------------------*/
static
PT_THREAD(fade(struct fader *f))
{
PT_BEGIN(&f->fade_pt);
while(1) {
PT_SPAWN(&f->fade_pt, &f->fade_in_pt, fade_in(f));
PT_SPAWN(&f->fade_pt, &f->fade_out_pt, fade_out(f));
etimer_set(&f->etimer, CLOCK_SECOND * 4);
PT_WAIT_UNTIL(&f->fade_pt, etimer_expired(&f->etimer));
}
PT_END(&f->fade_pt);
}
/*---------------------------------------------------------------------------*/
static void
init_fader(struct fader *f, int led)
{
PT_INIT(&f->fade_pt);
PT_INIT(&f->fade_in_pt);
PT_INIT(&f->fade_out_pt);
f->led = led;
}
/*---------------------------------------------------------------------------*/
PROCESS_THREAD(fader_process, ev, data)
{
static struct fader red, green, yellow;
static struct timer timer;
static struct etimer etimer;
PROCESS_BEGIN();
init_fader(&red, LEDS_RED);
init_fader(&green, LEDS_GREEN);
init_fader(&yellow, LEDS_YELLOW);
timer_set(&timer, CLOCK_SECOND/4);
while(!timer_expired(&timer)) {
PT_SCHEDULE(fade(&red));
}
timer_set(&timer, CLOCK_SECOND/4);
while(!timer_expired(&timer)) {
PT_SCHEDULE(fade(&red));
PT_SCHEDULE(fade(&green));
}
timer_set(&timer, CLOCK_SECOND/4);
while(!timer_expired(&timer)) {
PT_SCHEDULE(fade(&green));
PT_SCHEDULE(fade(&yellow));
}
etimer_set(&etimer, CLOCK_SECOND * 4);
fader_on();
while(1) {
PROCESS_WAIT_EVENT();
if(ev == PROCESS_EVENT_TIMER) {
etimer_set(&etimer, CLOCK_SECOND * 4);
process_poll(&fader_process);
}
if(onoroff == ON &&
PT_SCHEDULE(fade(&red)) &&
PT_SCHEDULE(fade(&yellow)) &&
PT_SCHEDULE(fade(&green))) {
process_poll(&fader_process);
}
}
PROCESS_END();
}
/*---------------------------------------------------------------------------*/
void
fader_on(void)
{
onoroff = ON;
process_poll(&fader_process);
}
/*---------------------------------------------------------------------------*/
void
fader_off(void)
{
onoroff = OFF;
}
/*---------------------------------------------------------------------------*/