void xyrun(){
	char i=0, r=0;
	char blocks[] = {'I', 'T', 'O', 'L', 'J', 'S', 'Z'};
	while(1){
		drawBlock('O', 2);
		drawField();
		b_y++;
		if(b_y == 21) b_y = 0;
		i = i<6 ? i++ : 0;
		r = r<3 ? r++ : 0;
		delay(10);
	}
}