Motorola DSP96002 - Manual (Page 561)

B-42 DSP96002 USER’S MANUAL MOTOROLA
r0
→
image(n,m) image(n,m+1) image(n,m+2)
r1
→
image(n+514,m) image(n+514,m+1) image(n+514,m+2)
r2
→
image(n+2*514,m) image(n+2*514,m+1) image(n+2*514,m+2)
r4
→
FIR coefficients
r5
→
output image
DSP56000 IMPLEMENTATION
Program ICycles
Words
move #mask,r4 ;point to coefficients 1 1
move #8,m4 ;mod 9 1 1
move #image,r0 ;top boundary 1 1
move #image+514,r1 ;left of first pixel 1 1
move #image+2*514,r2 ;left of first pixel 2nd row 1 1
move #2,n1 ;adjustment for end of row 1 1
move n1,n2 1 1
move #imageout,r5 ;output image 1 1
move x:(r0)+,x0 y:(r4)+,y0 ;first element, c(1,1) 1 1
do #512,_rows 2 3
do #512,_cols 2 3
mpy x0,y0,a x:(r0)+,x0 y:(r4)+,y0 ;c(1,2) 1 1
mac x0,y0,a x:(r0)-,x0 y:(r4)+,y0 ;c(1,3) 1 1
mac x0,y0,a x:(r1)+,x0 y:(r4)+,y0 ;c(2,1) 1 1
mac x0,y0,a x:(r1)+,x0 y:(r4)+,y0 ;c(2,2) 1 1
mac x0,y0,a x:(r1)-,x0 y:(r4)+,y0 ;c(2,3) 1 1
mac x0,y0,a x:(r2)+,x0 y:(r4)+,y0 ;c(3,1) 1 1
mac x0,y0,a x:(r2)+,x0 y:(r4)+,y0 ;c(3,2) 1 1
mac x0,y0,a x:(r2)-,x0 y:(r4)+,y0 ;c(3,3) 1 1
macr x0,y0,a x:(r0)+,x0 y:(r4)+,y0 ;preload, get c(1,1) 1 1
move a,y:(r5)+ ;output image sample 1 1
_rows
; adjust pointers for frame boundary
move x:(r0)+,x0 y:(r5)+,y1 ;adj r0,r5 w/dummy loads 1 1
move x:(r1)+n1,x0 y:(r5)+,y1 ;adj r1,r5 w/dummy loads 1 1
move (r2)+n2 ;adj r2 1 1
move x:(r0)+,x0 ;preload for next pass 1 1
_cols
--- ---
28
(Kernel=10N), 10N
2
+7N+12
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