On Thu, May 11, 2000 at 09:37:03PM +0100, Tim Waugh wrote:
> On Thu, May 11, 2000 at 02:15:52PM -0400, Derek Bouius wrote:
> > I really need read DMA for my device.
> See the archives of this list for why PIO reading hasn't been done yet
> (I have the fix but it isn't properly integrated yet). As for DMA, I
> think it just hasn't been tested much.
I did some pio-reading tests and I could read a single frame but the
port was not switched back correctly, at least not for my device (a
CPiA based webcam). In any case, the block-read interface is not
suitable for my purpose. A webcam delivers a stream of indefinite
length (due to compression). The end-of-stream is a data pattern in the
stream. The current read-functions do ieee-mode switching after reading
blocks which must not happen for the webcam. So I see no way to
implement streaming read with the current interface. I will try to show
some working code that implements what I need.
AFAIK, there is no dma-read code in the current 2.3.x-kernels.
-- Even the thought that a ship was waiting to take him back to Earth did not wipe out the sense of loss he felt at that moment. ------------------------------- Email: Peter_Pregler@email.com
-- To unsubscribe, send mail to: firstname.lastname@example.org -- -- with the single word "unsubscribe" in the body of the message. --
This archive was generated by hypermail 2b29 : Sun May 14 2000 - 09:52:24 EDT