#include <REGX52.H>

#define TT 8000

sbit STRm = 0x84;
sbit ACKm = 0x85;

sbit STRs = 0x86;
sbit ACKs = 0x87;

bit b1 = 1;
bit b2 = 1;

int dt = TT/1000;
int tt = TT/100;
unsigned char LiczB2 = 0x00;


void LiczInt0(void) interrupt 0 {
	EX0 = 0;
	LiczB2++;
	if(LiczB2 == 255){
		LiczB2 = 0;
	}
	EX0 =  1;
	b2 = 0;
	ACKm = 0;
}

void wait(int i){
	unsigned int k,l,m;

	for(l=0;l<i;l++){
		k=500;
		m=1000;
		k=m*k;
	}
}


void init(){
	LiczB2 = 0;
	if(P0_0 == 0){
	STRm = 1;
	ACKm = 0;
	}
	if(P0_0 == 1){
	STRs = 1;
	ACKs = 0;
	}
	IT0 = 1;
	EX0 = 1;
	EA = 1;
}

void main(){
	init();
	wait(tt);
	while(P0_0 == 0){
		while(b2){
			wait(dt);
		}
		P1 = LiczB2;
		b2 = 1;
		while(ACKm == 0){
		STRm = 0;
		P2 = P1;
		}

	}
	while(P0_0 == 1){
		while(STRs == 1){
			wait(dt);
		}
		P1 = P2;
		ACKs = 1;
		wait(50);

	}
}