#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) @ 0x10
{
	tics++;

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

		if (intflag == 1)
		{
			RB5 =  1;
			intflag = 0;
		}
		else
		{
			RB5 =  0;
			intflag = 1;
		}
	}
	TMR2IF = 0;
}

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
	//********************************************************************
	INTCON = 0;	// reset all the flag bits for all the interrupts

	T2CON  = 0x7E;	
	// hex 7E =
	// 76543210
	//  1111110 
	//  1111    -> postscale value 1:16
	//      1   -> enable timer2
	//       1x -> prescaler value 1:16

	// PR2 = 0xFF; default value
	TMR2IE = 1;	// TMR2 to PR2 enable match interrupt
	PEIE = 1;	// peripheral interrupt enable bit
	GIE  = 1;	// global interrupt enable bit (1: enable all)




	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);
		}
	}
}