Author: jack (ip100.boulder.quik.com)
Date: 04-05-2001 00:52
you are correct about the cnxns anders. but i have
an external DAC so its cool. Also, i can route
DAC thorugh DSP as i have it currently set up
(and that's cool too cause i can filter etc)
but i'm gonna try this code to volumize:
;a0-a3=sample data a4=log.volume table
;upper word of d0-d3=volume table index
;a5=DMA output buffer #xx is modified by a code-gen route
.loop
move.w (a0)+,d0
move.w (a4,d0.l),d0
lsr.w #xx,d0
move.w d0,(a5)+
----this is repeated 3 more times for
samples at a1,a2, and a3 w/ indexes of d1-d3 vs. d0
addq.l #8,a5
dbra size_of_sampleframe,.loop
of course if could cut out the lsr etc if i just
wanted a few (ie 16) volume levels
the above code only fills half of the 8 channels
so it will work in two passes
-jack
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