int fifo[8] = {0,0,0,0,0,0,0,0};
unsigned char indx = 0;
unsigned long Summ;
unsigned long OldOne;
unsigned long AvrResult;

OldOne=fifo[indx];
fifo[indx++] = NewResult;
Summ -=OldOne;
Summ +=NewResult;
AvrResult =Summ >> 3;