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GUS Programmer's Digest Mon, 13 Sep 93 0:07 MDT Volume 4: Issue 9
Today's Topics:
DMA rate divisor, correction
Standard Info:
- Meta-info about the GUS can be found at the end of the Digest.
- Before you ask a question, please READ THE FAQ.
----------------------------------------------------------------------
Date: Sun, 12 Sep 93 18:04:22 CDT
From: chuth@lonestar.utsa.edu (Cornel H. Huth)
Subject: DMA rate divisor, correction
Message-ID: <9309122304.AA25418@lonestar.utsa.edu>
> SEE Digest V4 #8 for details:
> Seems that when doing multiple transfers (as in patch cache to GRAM) and
> a small sample is transfered, the result can be...crap (noise). Bumping
> the DMA rate divisor from 0 to 1 fixed the problem.
Though that was NOT the cause of the problem. The problem was caused by
my ISR page-break handler clearing the GRAM_DMA_BUSY flag after returning
from the next page startup code. The next xfer would screw up the page-break
initiated xfer and... DMA rate divisor is back at 0 and working like a
Bat Out of Hell II. Weird coincidences can be so fun.
------------------------------
End of GUS Programmer's Digest V4 #9
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