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- ;
- ; This program originally available on the Motorola DSP bulletin board.
- ; It is provided under a DISCLAMER OF WARRANTY available from
- ; Motorola DSP Operation, 6501 Wm. Cannon Drive W., Austin, Tx., 78735.
- ;
- ; Lattice IIR Filter Macro. (test program)
- ;
- ; Last Update 31 Jul 86 Version 1.0
- ;
- ;
- ; LATTICE IIR
- ;
- opt cex
- page 132,66,0,10
- nolist
- include 'dsplib:ioequ'
- list
- include 'dsplib:latiir'
-
-
- order equ 3 ;three coefficient lattice
- datin equ $ffff ;location of input file
- datout equ $fffe ;location of output file
- npts equ 20 ;number of points to process
-
- org x:0
- kadd dc .5,-.5,.8 ;filter reflection coefficients
- org y:0
- state ds 3 ;filter states
-
- org p:$100
- start
- movep #0,x:M_BCR ;no wait states on external i/o
-
- move #kadd+order-1,r0 ;point to k's
- move #order-1,m0 ;mod order
- move #state,r4 ;point to state variables
- move #order-1,m4 ;mod order
-
- do #npts,_endp ;filter some points
- move y:datin,a ;get input sample
- latiir order ;filter it
- move a,y:datout ;output sample
- _endp
- END
-