Thank you everyone for your suggestion.  I really appreciate it.  My problem
is solved now.

:)
Best regards,
Thomas


>From: Bob Ammerman <RAMMERMAN@PRODIGY.NET>
>Reply-To: pic microcontroller discussion list <PICLIST@MITVMA.MIT.EDU>
>To: PICLIST@MITVMA.MIT.EDU
>Subject: [PIC]: Compare 4 numbers method. Please help!
>Date: Thu, 12 Apr 2001 19:29:19 -0400
>
>[warning: untested code ahead]
>
>;  Find the minimum and maximum of a vector (array) of numbers
>;
>;  Input:     FSR    points to first byte in the array
>;                W        number of elements in the array (>= 1)
>;
>; Output:
>;                HIPTR  pointer to largest element in the array
>;                LOPTR pointer to smallest element in the array
>;                HIVAL value of largest element in the array
>;                LOVAL value of smallest element in the array
>;                FSR points just past the array
>;                W destroyed
>;
>; Note:
>;                If more than one value in the array is the largest (or
>smallest)
>;                then HIPTR (LOPTR) will point to the last such element.
>;
>; Uses:    COUNT
>;
>get_min_max:
>     movwf      COUNT    ; size of array
>     clrf            HIVAL      ; use 0 as highest value so far
>     clrf            LOVAL    ; use 255 as lowest value so far
>     decf         LOVAL
>loop:
>     incf           FSR         ; point to next slot in array
>
>;    if  INDF >= HIVAL
>;        HIVAL = INDF
>;        HIPTR  = FSR
>;    end if
>
>     movf    HIVAL,W    ; Compute INDF-HIVAL and set carry if
>     subwf  INDF,W      ; ...INDF is greater or equal to HIVAL
>     skpc
>     goto    not_higher
>
>     movf        INDF,W
>     movwf     HIVAL
>     movf        FSR,W
>     movwf     HIPTR
>not_higher:
>
>;    if  INDF <= LOVAL
>;        LOVAL = INDF
>;        LOPTR  = FSR
>;    end if
>
>     movf        INDF,W        ; Compute LOVAL-INDF and set carry if
>     subwf      LOVAL,W    ; ...LOVAL is greater than or equal to INDF
>     skpc
>     goto        not_lower
>
>     movf        INDF,W
>     movwf     LOVAL
>     movf        FSR,W
>     movwf     LOPTR
>not_lower:
>
>; See if there are any more to do
>
>     decfsz        COUNT
>     goto            loop
>     return
>
>
>;===============================================
>
>You can call this routine like this:
>
>     CBLOCK
>      ADC_0
>      ADC_1
>      ADC_2
>      ADC_3
>     ENDC
>
>     movlw    ADC_0    ; point to first ADC's value
>     movwf    FSR
>     movlw    4               ; number of values
>     call         get_min_max
>
>; Now, lets say we want to know which ADC was lowest:
>
>     movf       LOPTR,W    ; pointer to lowest
>     addlw     0-ADC0        ; minus pointer to first one
>
>W is now 0,1,2,3
>
>; And similarly for highest
>
>Bob Ammerman
>RAm Systems
>(contract development of high performance, high function, low-level
>software)
>
>--
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