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PIC Microcontoller Sorting Method

Bubble sort by Regulus Berdin

> Can anyone point me towards an example of code (asm, not c) 
> that will sort  (re-arrange) a group of 10 or so numbers stored in 
> consecutive RAM locations into ascending order?  Or descending 
> order, doesn't really matter which. 

Try this (untested): 

        cblock 
                d1,d2,d3,d4,d5,d6,d7,d8,d9,d10 
                tmp 
                i 
        endc 

bubble: 
        movlw   9 
        movwf   i 
        addlw   d1 
        movwf   FSR 

loop1   movf    INDF,w  ;for i = 9 to 1 'd10 to d2 
        movwf   tmp     ;tmp = d[d1+i] 

loop2   decf    FSR,f   ;for FSR = (d1+i-1) to d1 

        movf    tmp1,w  ;compare 
        subwf   INDF,w  
        skpc            ;change this to skpnc to change sort order 
         goto   noswap  

swap    movf    tmp1,w  
        xorwf   INDF,f  
        xorwf   INDF,w  
        xorwf   INDF,f 
        movwf   tmp 

noswap  movlw   d1 
        xorwf   FSR,w 
        skpz 
         goto   loop2 

        movlw   d1  
        addwf   i,w 
        movwf   FSR 
        movf    tmp,w 
        movwf   INDF    ;d[d1+i] = tmp 
        decf    FSR,f 
        decfsz  i,w 
         goto   loop1 

        return 

;equivalent in C 

        for (i=10;i>1;i--) { 
           tmp=d[i]; 
           for (k=i-1;i>0;k--) 
               if (d[k]>tmp) { 
                  tmp2=tmp; 
                  tmp=d[k]; 
                  d[k]=tmp2; 
               } 
           d[i]=tmp; 
        } 



file: /Techref/microchip/sort-rb.htm, 1KB, , updated: 2009/2/13 15:03, local time: 2022/12/9 11:01,
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<A HREF="http://www.massmind.org/techref/microchip/sort-rb.htm"> PIC Microcontoller Sorting&nbsp;Method Bubble sort by Regulus Berdin</A>

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