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/* $Id$ */
/*
 * Copyright (c) 2011 Dimitri Sokolyuk <demon@dim13.org>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include <inttypes.h>
#include <avr/io.h>
#include "kernel.h"
#include "tasks.h"

void hsv(uint8_t *, uint8_t *, uint8_t *, uint16_t, uint8_t, uint8_t);

void
rgb(void *arg)
{
	struct rgbarg *a = (struct rgbarg *)arg;
	uint32_t d = deadline();
	uint32_t r = release();
	uint16_t i = 0;
	uint8_t v;

	for (;;) {
		i = (i + 1) % 360;
		v = i % 120;
		v = (v < 60) ? 255 - 2 * v : 15 + 2 * v;

		hsv(a->r, a->g, a->b, i, 255, v);

		r = d;
		d += MSEC(28);
		update(r, d);
	}
}

void
pwm(void *arg)
{
#define	SCALE 4
	struct pwmarg *a = (struct pwmarg *)arg;
	uint32_t d = deadline();
	uint32_t r = release();

	DDRB |= _BV(a->pin);
	PORTB &= ~_BV(a->pin);

	for (;;) {
		if (*a->value > 0) {
			PORTB |= _BV(a->pin);
			d = r += USEC(*a->value << SCALE);
			update(r, d);
		}

		if (*a->value < 255) {
			PORTB &= ~_BV(a->pin);
			d = r += USEC((255 - *a->value) << SCALE);
			update(r, d);
		}
	}
}