I got some time and tried to rewrite your filter code to optimize it a little bit.
The formula can be rewritten as: Ave' = Ave + ( New - Ave )/16 ;
Used the same names for variables. TEMP cell isn't used.
I having more and more believing that 12 is some magical number for small completed code fragments. ;)
; Initially written by Andrew Warren (fastfwd at ix.netcom.com). ; Optimized by Dmitry A. Kiryashov (zews at aha.ru) 06/18/2000 ; 12 clocks/words Filter: movfw AVE subwf NEW,F ;NEW - AVE swapf NEW,W andlw 0x0F ;get /16 int part skpc ;result is neg? iorlw 0xF0 ;yes addwf AVE,F swapf NEW,W andlw 0xF0 ;get /16 frac part addwf AVFRAC,F skpnc incf AVE,F ; ; low nibble of AVFRAC isn't used ; so we can utilize it for other purposes ;)
|file: /Techref/microchip/dsp/av-16w-dk.htm, 2KB, , updated: 2010/3/16 07:25, local time: 2023/12/11 03:35,
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<A HREF="http://techref.massmind.org/Techref/microchip/dsp/av-16w-dk.htm"> PIC Microcontoller DSP Math Method 8bit 16 step Averageing filter by Dmitry</A>
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