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- To: hatari-devel@xxxxxxxxxxxxxxxxxxx
- Subject: Re: [hatari-devel] STe DMA sound
- From: Vincent Rivière <vincent.riviere@xxxxxxxxxxx>
- Date: Sat, 14 Apr 2018 20:35:30 +0200
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On 14/04/2018 at 18:56, Vincent Rivière wrote:
NB: The only sane possibility would be that DmaSnd_GenerateSamples() trashes
the YM sound by some side effect.
Sherlock Holmes:
"Once you eliminate the impossible, whatever remains, no matter how
improbable, must be the truth."
And he was again right.
In dmaSnd.c, I have commented out all changes to MixBuffer().
It results in no digidrums, but artifact still present.
Near line 574:
MonoByte = DmaSnd_FIFO_PullByte ();
If I replace that to "MonoByte = 0", the artifact disappears.
As I understand:
- disabling DMA mixing does not change anything
- but stopping *reading* DMA data fixes the issue
How is it possible?
--
Vincent Rivière