Date: Mon, 18 Aug 1997 12:41:43 +0200 (MET DST) From: Luigi Rizzo <luigi@labinfo.iet.unipi.it> To: hasty@rah.star-gate.com (Amancio Hasty) Cc: msmith@atrad.adelaide.edu.au, terry@lambert.org, mestery@winternet.com, freebsd-multimedia@FreeBSD.ORG, current@FreeBSD.ORG Subject: Re: Problem with my Wincast, fxtv Message-ID: <199708181041.MAA10169@labinfo.iet.unipi.it> In-Reply-To: <199708180405.VAA03040@rah.star-gate.com> from "Amancio Hasty" at Aug 17, 97 09:04:53 pm
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> Please, post proposed changes to the multimedia mailing first so at
> the very least the multimedia group can present a unified consesus
> agreement .
the code is in the README file of my last snap (and I thought I also
posted it explicitly, if I didn't it was just by mistake).
At any rate the code is as follows:
/*
* this stops the dma channel and returns the residual count
* derived calling isa_dmastatus
*/
int isa_dmastop(int chan)
{
if (dma_inuse & (1 << chan) == 0)
printf("isa_dmastop: channel %d not acquired\n", chan);
if (dma_busy & (1 << chan) == 0)
printf("isa_dmastop: channel %d not acquired\n", chan);
if ((chan & 4) == 0)
outb(DMA1_SMSK, (chan & 3) | 4 /* disable mask */);
else
outb(DMA2_SMSK, (chan & 3) | 4 /* disable mask */);
return isa_dmastatus(chan);
}
I am not at all concerned on the presence of the checks in the
first two lines (since if the channel is already disable then there
is no problem anyways).
CHeers
Luigi
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