/*
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation. See the file COPYING
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * Copyright (C) 2010 Frank van Maarseveen <frankvm@frankvm.com>
 */

#ifndef _HARDWARE_H_
#define _HARDWARE_H

#include <avr/io.h>
#include "bits.h"

/*
 * attiny85 lfuse:	0x62 -> 0x42	make lfuse
 *  7	CKDIV8:		0    0		init CLKPR[CLKPS] to 0011 (divide clock by 8)
 *  6	CKOUT		1    1
 *  5	SUT1:		1 -> 0		SUT=00: startup/reset asap (6+14CK)
 *  4	SUT0:		0    0
 *  3	CKSEL3		0    0
 *  2	CKSEL2		0    0
 *  1	CKSEL1		1    1
 *  0	CKSEL0		0    0
 *
 * attiny85 hfuse	0xdf -> 0xde	make hfuse
 *  7	RSTDISBL	1    1		note: programming this 0 affects SUT
 *  6	DWEN		1    1
 *  5	SPIEN		0    0
 *  4	WDTON		1    1
 *  3	EESAVE		1    1
 *  2	BODLEVEL2	1    1
 *  1	BODLEVEL1	1    1
 *  0	BODLEVEL0	1 -> 0		BOD at 1.8V
 *
 * attiny85 efuse	0xff -> 0xfe	make efuse
 *  0	SELFPRGGEN	1 -> 0		Enable self-programming
 *
 */

#define MHZ 4		/* CLKPR[CLKPS] will be set to 0001, dividing by 2 */

/*
 * The LED for program transmission is at pin 5, PB0.
 */
#define LED		(B, 0)

__attribute__((always_inline))
static inline void hw_init(void)
{
	CLKPR = _BV(CLKPCE);
	CLKPR = BIN8(0001);		/* CLKPS = 0001, divide final system clock by 2 */
}

#endif