//include file
#include <pic.h>

//16F84 configuration 
__CONFIG(0x3FF1);

#define PORTBIT(adr, bit)	((unsigned)(&adr)*8+(bit))

static bit LED0 @ PORTBIT(PORTB, 0);
static bit LED1 @ PORTBIT(PORTB, 1);
static bit LED2 @ PORTBIT(PORTB, 2);
static bit LED3 @ PORTBIT(PORTB, 3);
static bit LED4 @ PORTBIT(PORTB, 4);
static bit LED5 @ PORTBIT(PORTB, 5);
static bit LED6 @ PORTBIT(PORTB, 6);
static bit LED7 @ PORTBIT(PORTB, 7);

unsigned int i;		//for loop pause
unsigned int c;		//for loop event loop

//pause functions
void pause_1();
void pause_2();

//main function
void main(void)
{	

	TRISB = 0x00;
	PORTB = 0b00000000;	
	
	while(1)
	{

		for(c=0; c<10; c++)
		{


			//forward
			LED0 = 1; 
			pause_1();
		
			LED0 = 0;
			LED1 = 1;
			pause_1();
		
			LED1 = 0;
			LED2 = 1;
			pause_1();
		
			LED2 = 0;
			LED3 = 1;
			pause_1();
			
			LED3 = 0;
			LED4 = 1;
			pause_1();
		
			LED4 = 0;
			LED5 = 1;
			pause_1();
		
			LED5 = 0;
			LED6 = 1;
			pause_1();
			
			LED6 = 0;
			LED7 = 1;
			pause_1();
			
			LED7 = 0;


			//reverse
			LED6 = 1; 
			pause_1();
		
			LED6 = 0;
			LED5 = 1;
			pause_1();
			
			LED5 = 0;
			LED4 = 1;
			pause_1();
			
			LED4 = 0;
			LED3 = 1;
			pause_1();
			
			LED3 = 0;
			LED2 = 1;
			pause_1();
		
			LED2 = 0;
			LED1 = 1;
			pause_1();
		
			LED1 = 0;
			LED0 = 1;
			pause_1();
			
		
		};

		//re-initalize PORTB
		PORTB = 0b00000000;
		
		for(c=0; c<10; c++)
		{

			PORTB = 0b10101010;
			pause_2();
			
			PORTB = 0b01010101;
			pause_2();
			
		};

		for(c=0; c<10; c++)
		{

			PORTB = 0b11110000;
			pause_2();

			PORTB = 0b00001111;
			pause_2();

		};

		for(c=0; c<10; c++)
		{

			PORTB = 0b11001100;
			pause_2();

			PORTB = 0b00110011;
			pause_2();

		};

		for(c=0; c<10; c++)
		{

			PORTB = 0b10000001;
			pause_1();

			PORTB = 0b01000010;
			pause_1();

			PORTB = 0b00100100;
			pause_1();

			PORTB = 0b00011000;
			pause_1();

			PORTB = 0b00100100;
			pause_1();

			PORTB = 0b01000010;
			pause_1();

		};

	}

}

void pause_1()
{

	for(i=0; i<4000; i++);
	for(i=0; i<4000; i++);

};

void pause_2()
{

	for(i=0; i<4000; i++);
	for(i=0; i<4000; i++);
	for(i=0; i<4000; i++);
	for(i=0; i<4000; i++);
	for(i=0; i<4000; i++);
	for(i=0; i<4000; i++);

};