How to implement FIR filter with assembly?

　　The FIR filter assembly algorithm is corresponding to the processor, but most common systems will use a DSP processor provided by the ring cache.

　　1. Configure the ring cache. Loading factor and delay line pointer. Then do the following for each sample point:

　　2. Store the incoming data in the delay line; increment the delay-line pointer.Digital

　　3. Clear the multiplier-accumulator.

　　4. Loop over all coefficients/delays; accumulate the values obtained by multiplying the coefficients by the delayed samples.

　　5. Round or truncate the result as the FIR output.

　　Alternatively, a "shuffle down" method is used in Texas Instruments' older fixed-point processors to implement circular buffers. The processor literally moves each sample delay values by one slot during each multiply-accumulate (via the "MACD" instruction).

　　Each DSP microprocessor manufacturer provides example FIR assembly code in its data books or its application handbooks, so be sure to look at those before you "reinvent the circular buffer".

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