di2739.txt
;***************************************************************************************************
; LISTING 1 - BIT-REVERSE ALGORITHM
;
; "Routine yields fast bit reversing for DSP algorithms," EDN, Sept 13, 2001, pg 78
;
;*********************************************************************************************
#define   BRmod         //bit-reverse of N/2, N-length of input data
#define   in-arry          //bit-reversed address of input data location
#define   out-arry        //address of output array
#define   N                  //length of input data

 BR-Algorithm:
 bit set mode1 BR0;                         //this allows BR-mode
 b0=in-arry;   l0=0;  m0=BRmod;    //this is circular buffers
 b8=out-arry;  l8=N;  m8=1;
 r0=dm(i0,m0);
 lcntr = (N-1), do br until lce;          //this is a loop counter
 br: r0=dm(i0,m0), pm(i8,m8)=r0;
 pm(i8,m8)=r0;
 bit clr mode1 BR0;                         //this clears the BR-mode