/*
 * 1 wire header
 *
 * This is the user servicable stuff - how to do delays and how to
 * frob the IO pins.
 *
 * $Id$
 *
 * Copyright (c) 2004
 *      Daniel O'Connor <darius@dons.net.au>.  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.
 *
 * THIS SOFTWARE IS PROVIDED BY AUTHOR 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 AUTHOR 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.
 */

/*
 * Alter these for your configuration
 */

/* Set DDR on the right pins */
#define OWBUSINIT()		do {			\
	                            DDRD |= _BV(4);	\
				    DDRD &= ~_BV(3);	\
                                } while (0)

/* Read the 1-wire bus, non-inverting logic */
#define OWREADBUS()		(PIND & _BV(3) ? 1 : 0)

/* Set the 1-wire bus to 0
 * Turns a transistor on to pull it low
 */
#define OWSETBUSLOW()		PORTD |= _BV(4)

/* Set the 1-wire bus to 1
 * Turn the transistor off to let the pullup do its job
 */
#define OWSETBUSHIGH()		PORTD &= ~_BV(4)

/* _delay_us can only do a delay of 768/clock_freq */
#if F_CPU > 16000000
#error F_CPU > 16MHz, delays need adjusting
#endif

#define OWDELAY_A _delay_us(6)						/* 6 usec */
#define OWDELAY_B do { _delay_us(48); _delay_us(16); } while (0)	/* 64 usec */
#define OWDELAY_C do { _delay_us(48); _delay_us(12); } while (0)	/* 60 usec */
#define OWDELAY_D _delay_us(10)						/* 10 usec */
#define OWDELAY_E _delay_us(9)						/* 9 usec */
#define OWDELAY_F do { _delay_us(55); } while (0)			/* 55 usec */
#define OWDELAY_G							/* 0 usec */
#define OWDELAY_H do { _delay_us(48); _delay_us(48);  _delay_us(48); 	\
	_delay_us(48);	_delay_us(48);  _delay_us(48);  _delay_us(48);  \
	_delay_us(48);_delay_us(48);  _delay_us(48); } while (0)	/* 480 usec */
#define OWDELAY_I do { _delay_us(48); _delay_us(22); } while (0)	/* 70 usec */