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QRZ! Ham Radio 8
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QRZ Ham Radio Callsign Database - Volume 8.iso
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firt.asm
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Assembly Source File
|
1991-11-26
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1KB
|
42 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
;
;
; FIR test program
;
opt cex,mex
page 132,66,0,10
include 'fir'
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
ntaps equ 4 ;number of taps in filter
org x:0
states dsm ntaps ;filter states
org y:0
coef dc .1,.3,-.1,.2 ;coefficients
org p:$100
start
move #states,r0 ;point to filter states
move #ntaps-1,m0 ;mod(ntaps)
move #coef,r4 ;point to filter coefficients
move #ntaps-1,m4 ;mod(ntaps)
do #npts,_endp
movep y:datin,x0 ;get sample
fir ntaps ;do fir
movep a,y:datout ;output sample
_endp
end