From:	"Ghalos" <greg AT holdridge7 DOT freeserve DOT co DOT uk>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Sound DMA
Date:	Wed, 22 Dec 1999 11:09:51 -0000
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To:	djgpp AT delorie DOT com
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp
Reply-To:	djgpp AT delorie DOT com

I'm trying to get sound working under DJGPP and so I have to figure out how
to use the DMA.   I have managed to get enough info to sort out which ports
to send what to in order to get auto-initialised DMA up and running (32k
buffer, interrupt called every 8k) I have also looked at some example code
and the FAQ....

Now the problem I am having is to get the interrupt written.  I know-ish how
to write interrupt funcitons in general... I have a functioning (and
stable!) keyboard handler BUT this is a bit more difficult.  I have two
buffers... one mixing buffer in protected mode memory and a copy of it for
the DMA buffer in DOS memory... what I want to know is... assuming I have
locked both of these buffers and the handler function.... is it safe to use
functions like memset() and dosmemput() in an interrupt handler.... do I
need to lock them? how do I do it?

thanks a lot,
--
Ghalos - greg AT holdridge7 DOT freeserve DOT co DOT uk

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