[En-Nut-Discussion] Nut OS reliable on AT91SAM7X Evaluation Board?

Ole Reinhardt ole.reinhardt at embedded-it.de
Wed Nov 18 17:21:25 CET 2009

Hi Ulrich,

> I come back to your code next week. I'd like to implement PDC/DMA for 
> the network and the SPI channels. If supported, I'd like to implement it 
> for a background memcpy too.

Background memcopy won't work, as the PDC does not support
memory<->memory dma.

And always keep in mind the overhead for the pdc. Especial with the SPI
I implemented PDC for the SPI function and these became notably slower
as polling mode when just sending small data packets. 

Having both possibilities and an automatic decision which of them to use
would be nice. 



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