/****************************************************************************
*
*   Copyright (c) 2005 Dave Hylands
*
*   This program 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 of the License, or
*   (at your option) any later version.
*
*   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.
*
*   You should have received a copy of the GNU General Public License
*   along with this program; if not, write to the Free Software
*   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
*
****************************************************************************/

#include <avr/io.h>

#include "Delay.h"

#define RED_LED_PIN     4
#define RED_LED_MASK    ( 1 << RED_LED_PIN )
#define RED_LED_DDR     DDRG
#define RED_LED_PORT    PORTG

#define BLUE_LED_PIN    3
#define BLUE_LED_MASK   ( 1 << BLUE_LED_PIN )
#define BLUE_LED_DDR    DDRG
#define BLUE_LED_PORT   PORTG

#define YELLOW_LED_PIN  4
#define YELLOW_LED_MASK ( 1 << YELLOW_LED_PIN )
#define YELLOW_LED_DDR  DDRB
#define YELLOW_LED_PORT PORTB

// Setting the pin to 0 turns the LED on

#define LED_ON( color )     color ## _LED_PORT &= ~color ## _LED_MASK
#define LED_OFF( color )    color ## _LED_PORT |= color ## _LED_MASK

int main(void)
{
    int led;

    InitTimer();

    ASSR &= ~( 1 << AS0 );  // Make sure Port G LED pins are setup for I/O

    RED_LED_DDR     |= RED_LED_MASK;
    YELLOW_LED_DDR  |= YELLOW_LED_MASK;
    BLUE_LED_DDR    |= BLUE_LED_MASK;

    led = 0;

    while( 1 )
    {
        // Turn all of the LEDs off

        LED_OFF( RED );
        LED_OFF( BLUE );
        LED_OFF( YELLOW );

        switch ( led )
        {
            case    0:  LED_ON( RED );      break;
            case    1:  LED_ON( BLUE );     break;
            case    2:  LED_ON( YELLOW );   break;
        }

        if ( ++led > 2 )
        {
            led = 0;
        }

        {
            int i;

            // Tick rate is 100/sec so waiting for 100 waits for 1 sec

            for ( i = 0; i < 100; i++ ) 
            {
                    WaitForTimer0Rollover();
            }
        }
    }

    return 0;
}