[rtl] DMA and real time interrupts

[SteenbeckDigital <steenbeckdigital@compuserve.com>]

----------------------eric keller wrote--------------------
My question is, is it possible to port this code to rtlinux.
(AD DA with DMA)

If so, has anyone used DMA? i found one message in the archive asking that
question with no answer.
-------------------------------------------------------------

Yes, I do DMA within RtLinux, but without any interrupt service. The trick
is to set the
Loop bit in the DMA controller and to poll the position (4times). So I get
every byte 
even on a busy machine :-). Second part of it is a rt_process that does
rt_gettime() and
dma_residue() to see when what came in / went out. No interrupt latency
problem at all.
(Source??)

!!!!! This is not portable to anything else than a PC !!!!!!!!

Jens Michaelsen
http://www.steenbeckdigital.de
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