/* blink.c -- Blink program for Christmas trees
   Copyright 2000, 2001, 2002 Free Software Foundation, Inc.
		 Written by Stephane Carrez (stcarrez@nerim.fr)

This file is part of GTAM.

GTAM is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.

GTAM 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.

You should have received a copy of the GNU General Public License
along with GTAM; see the file COPYING.  If not, write to
the Free Software Foundation, 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.  */

#include <sys/ports.h>

#define BIT_0 (1<<0)
#define BIT_1 (1<<1)
#define BIT_2 (1<<2)
#define BIT_3 (1<<3)
#define BIT_4 (1<<4)
#define BIT_5 (1<<5)
#define BIT_6 (1<<6)
#define BIT_7 (1<<7)

int __attribute__((noreturn)) main (void);
void _start (void);
void delay_ms (unsigned ms);

void _start()
{
    __asm__ __volatile__ ("lds #0xFF");
	__asm__ __volatile__ ("bra main");
}

/* Wait 'ms' milliseconds (not accurate (:- (:-), hand adjusted
   and based on human time accuracy (understand, SCz feeling).  */
void delay_ms(unsigned ms)
{
    while (ms > 0)
	{
        unsigned char i;
        unsigned short tcnt;

        for (i = 100; --i != 0;)
            tcnt = get_timer_counter ();
        ms--;
	}
}

int main()
{
    while (1)
	{
		_io_ports[M6811_PORTA] |= BIT_6;
	    delay_ms (1);
	    _io_ports[M6811_PORTA] &= ~BIT_6;
        delay_ms (1);
	}
}