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iir6t.asm
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Assembly Source File
|
1991-11-26
|
1KB
|
45 lines
;
; This program originally available on the Motorola DSP bulletin board.
; It is provided under a DISCLAIMER OF WARRANTY available from
; Motorola DSP Operation, 6501 Wm. Cannon Drive W., Austin, Tx., 78735.
;
; Last Update 16 Jul 87 Version 1.0
;
; IIR6 Filter Test Program
;
opt cex,mex
page 132,66,0,10
include 'iir6'
datin equ $ffff ;location in Y memory of input file
datout equ $fffe ;location in Y memory of output file
npts equ 20 ;number of points to process
nstates equ 5 ;number of states
org x:0
states dsm nstates+1 ;filter states
org y:0
coef
dc .8,-.7,.6,-.5,.4 ;a1,a2,a3,a4,a5
dc .1,.2,.3,.4,.5 ;b1,b2,b3,b4,b5
org p:$100
start
move #states,r0 ;point to filter states
move #nstates,m0 ;mod (nstates+1)
move #coef,r4 ;point to filter coefficients
move #2*nstates-1,m4 ;mod (2*nstates)
do #npts,_endp
movep y:datin,a ;get sample
iir6 nstates ;do 2nd order iir
movep a,y:datout ;output sample
_endp
end