#include	<pic.h>

#include	"delay.c"

__CONFIG(WDTDIS & XT & UNPROTECT & LVPDIS);

#define DELAY	250

long tics = 0l;
int  intflag = 1;

void interrupt prv_int(void)
{
	if (!T0IF)
		return;

	T0IF = 0;

	tics++;

	if (tics == 6)
	{
		tics = 0l;

		if (intflag == 1)
		{
			RB5 =  1;
			intflag = 0;
		}
		else
		{
			RB5 =  0;
			intflag = 1;
		}
	}
}

void main()
{
	int  flag = 1;
	
	//********************************************************************
	// setting input & output ports
	//********************************************************************
	TRISB  = 0b11000000;	// set RB5-RB0 as output
	CMCON  = 0b00000111;	// disable comparator on ra0,1,2
	TRISA  = 0b11111111;	// set RA7-RA0 as input
		
	//********************************************************************
	// setting timer mode
	//********************************************************************
	T0CS   = 0;	// Enable timer mode
	PSA    = 0;	// Enable prescaler assignement 
	PS2    = 1;	//
	PS1    = 1;	// 111 mean prescaler set to 1:256
	PS0    = 1;	//

	//********************************************************************
	// setting interrupt
	//********************************************************************
	INTCON = 0;	// reset all the flag bits for all the interrupts
	GIE  = 1;	// global interrupt enable bit (1: enable all)
	T0IE = 1;	// TMR0 overflow interrupt enable bit (1: enable TMR0)

	while(1)
	{
		if (RA0 == 1)
		{
			flag = 0;
		}
		if (RA1 == 1)
		{
			flag = 1;
		}
		if (RA2 == 1)
		{
			PORTB = 0b00111111;
			flag = 0;
		}
		if (RA3 == 1)
		{
			PORTB = 0b00000000;
			flag = 0;
		}
		if (flag == 1)
		{
			RB4 =  1; DelayMs(DELAY);
			RB4 =  0; DelayMs(DELAY);
			RB3 =  1; DelayMs(DELAY);
			RB3 =  0; DelayMs(DELAY);
			RB2 =  1; DelayMs(DELAY);
			RB2 =  0; DelayMs(DELAY);
			RB1 =  1; DelayMs(DELAY);
			RB1 =  0; DelayMs(DELAY);
			RB0 =  1; DelayMs(DELAY);
			RB0 =  0; DelayMs(DELAY);
		}
	}
}