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long long int for floating average computation

George Bunter

I want to compute a floating average of third order.
Just take a look at my code:

void IRQ_Handler()__irq __ram
{
        static long long unsigned int ACC1,ACC2,ACC3,ACC3D;
        static long long unsigned int D1,D2,D3,D1D,D2D;
        static unsigned int int_counter;
        char text[10];

        T0CLRI = 0;
        ADCCON = 0x6A3;                 // software conv., single-ended, conv. enabled
        while (!ADCSTA){}               // wait for end of conversion

        ACC1 += (ADCDAT >> 16) * 100;
        ACC2 += ACC1;
        ACC3 += ACC2;

        if (!(int_counter++ & 0x7F))
        {
                D1 = ACC3 - ACC3D;
                D2 = D1 - D1D;
                D3 = D2 - D2D;
                ACC3D = ACC3;
                D1D = D1;
                D2D = D2;

                sprintf(text,"%8.d",D3 >> 21);
                SDA5708_printf(text);
        }
}


befor i used long long there were overflow.
If increasing Filter lenght there will be overflows even while using long long. Is there a work around?

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