HEDS5540 optical encoder

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  1. - 2nd October 2016, 22:56 #4
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    richard
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    Default Re: HEDS5540 optical encoder

    easiest way


    Code:
    Flag var byte
wsave VAR BYTE    $70     SYSTEM  ; alternate save location for W 
enc_new VAR BYTE
enc_old VAR BYTE
enc_counter VAR WORD


    Code:
    asm    

    ;Read latest input from PORTB & put the value in _enc_new.
         MOVE?CB    1 ,_Flag
         movf    PORTB,W
         movwf  _enc_new

         ;Strip off all but the 2 MSBs in _enc_new.

         movlw    B'11000000'    ;Create bit mask (bits 7 & 6).
         andwf   _enc_new,F         ;Zero bits 5 thru 0.

         ;Determine the direction of the
    Last edited by richard; - 2nd October 2016 at 22:58. Reason: CASE SENSITIVE
    Warning I'm not a teacher
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