#include <REGX52.h>   //program care stocheaza si compara(bun)

#define Baud_rate 0xF4
char i=0,j=0,buf[12],var[10],buf2[10];
bit aux=0;
char contor;
 
init(){
	TMOD=0x20;
	SCON=0x50;
	TH1=Baud_rate;
	TL1=Baud_rate;
	EA=1;
	ES=1;
	TR1=1;
}

void main(){
	contor=0;
	buf2[0]=0x30;buf2[1]=0x34;buf2[2]=0x31;
	buf2[3]=0x35;buf2[4]=0x44;buf2[5]=0x38;
	buf2[6]=0x41;buf2[7]=0x31;buf2[8]=0x46;
	buf2[9]=0x031;
	P2_0=0;

	init();
	while(1);
}

void serial_IT(void) interrupt 4
{
	if(RI){
			buf[i]=SBUF;
			//delay(100);
			RI=0;
			}
		if(i<12) i++;
		else{ 
		i=0;
		if(buf[0]==0x0A){
		P2_1=0;
		if(buf[11]==0x0D){
			P2_2=0; 
			for(j=0;j<9;j++){
				var[j]=buf[j+1];
				if(var[j]!=buf2[j]) aux=1;
					}
				}
			}
		if(aux==0){
			P2_3=0;
			}
	
		}
		
}
 

this is a working code for reading a tag and compare it with the one in memory...how can i modify it to be able to read more tags(at the moment after reading a tag,valid or not,and lighting the right leds the program stops working and i am not able to read another tag)