user manual

BENCHMARK PROGRAMS
B - 10 BENCHMARK PROGRAMS MOTOROLA
;This program originally available on the Motorola DSP bulletin board.
;It is provided under a DISCLAIMER OF WARRANTY available from
;Motorola DSP Operation, 6501 William Cannon Drive, Austin, TX, 78735
;
;Radix-2, In-Place, Decimation-In-Time FFT (smallest code size).
;
;Last Update 30 Sep 86 Version 1.1
;
fftr2a macro points,data,coef
fftr2a ident 1,1
;
;Radix-2 Decimation-In-Time In-Place FFT Routine
;
; Complex input and output data
; Real data in X memory
; Imaginary data in Y memory
; Normally ordered input data
; Bit reversed output data
; Coefficient lookup table
; -Cosine values in X memory
; -Sine values in Y memory
;
;Macro Call — ffr2a points,data,coef
;
; points number of points (2-32768, power of 2)
; data start of data buffer
; coef start of sine/cosine table
;
;Alters Data ALU Registers
;x1x0y1y0
;a2a1a0a
;b2b1b0b
;
;Alters Address Registers
;r0 n0 m0
;r1 n1 m1
;n2
;
;r4 n4 m4
;r5 n5 m5
;r6 n6 m6
‘
‘Alters Program Control Registers
;pc sr
;
;Uses 6 locations on System Stack
;
Figure B-2 Radix 2, In-Place, Decimation-In-Time FFT (Sheet 1 of 2)