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Is it possible to keep the CPPI controller from modifying descriptors? (mark them as read-only)

Patrick McKinnon
Prodigy 30 points

I have configured the musb/cppi controller to use RNDIS/AUTOREQ using a descriptor that never needs to change (destination address, packet-size, etc. are always constant)

Is it possible to keep the CPPI controller from modifying the packet-size fields so that I can avoid having to take any interrupts to change the fields back to their original value?

 

Thanks!

-Patrick