|
|
Atari coding BBS
| STe DMAsound crackling |
|---|
|
Posted by: Pete
|
Jul,07.2012-03:41
|
Hi Guys, I've sampled a 10 sec song at 12517hz and play it back and it plays quite well through the sound DMA channel.
Then I thought, why not change the background color while the sample is playing( nothing special just change the background color on the fly.)
move.w #$ffff,d0 ;color 0 counter
loop1:
move.w d0,$ff8240 ;color reg 0
loop2:
move.w #100,d1
dbra d1,loop2
sub #$111,d0 ; all grey colours
brne loop1
jsr wait_key ; ESC to return to assembler
bra loop1
When I add this code the sampled sound plays back with crackling in the sound. It seems to me that the sound DMA channel is being interrupted by the CPU for a few nano's which causes the crackling sound, would that be correct?
I would think that DMA sound would have it's own memory buffers so this type of problem would not accur.
Any info on this guys ?
Pete
|
[All messages in this thread] [Start new thread]
What's the anti-troll code?
That's your personal code to be able to add comments and messages on the dhs.nu site.
Don't have a code or forgot it? Fix it here.
|
