Hi Brian, thanks! Quick update first: raised the CMakeLists omission internally, should be fixed soon, far as I can tell.
Best regards, Marcus On Mon, 2018-09-24 at 14:52 -0400, Brian Padalino via USRP-users wrote: > I noticed that the dma_fifo_block_ctrl.hpp file isn't included in the > installation of UHD as of current master: > > > https://github.com/EttusResearch/uhd/blob/6af6ac32c30d2dc0efa6eab61e4a3920649e3e62/host/include/uhd/rfnoc/CMakeLists.txt > > It seems like this is just a simple oversight, so I modified it > locally. I've been running doing some latency experiments and > modifying the size of the DMA FIFO using the resize() method: > > > https://github.com/EttusResearch/uhd/blob/6af6ac32c30d2dc0efa6eab61e4a3920649e3e62/host/lib/rfnoc/dma_fifo_block_ctrl_impl.cpp#L65 > > And it seems there's a bit of a restriction on the sizing associated > with the FIFO: > > > https://github.com/EttusResearch/uhd/blob/6af6ac32c30d2dc0efa6eab61e4a3920649e3e62/host/lib/usrp/cores/dma_fifo_core_3000.cpp#L263 > > I see it currently says that the FIFO needs to be >8k, and it has to > be a power of 2. If either of those criteria fails, an exception is > thrown. > > A few requests: > > (1) Can you not throw an exception, but print a warning and resolve > the criteria? For example, if I ask for < 8k, up it to 8k and print > a warning it's been upped. If I ask for a non-power of 2, can you > print a warning and up to to the next supported power of 2? Think of > this like a request for a sample rate - if you can't get the exact > one, you get what's close and the user can query the actual value? > > (2) Speaking of powers of 2, why is this a requirement? Can it be > any value that is a multiple of a 4k page boundary? Is there > something inside the FPGA logic that doesn't allow this to happen? > Powers of 2 can be a large buffer size changes. > > Thanks, > Brian > _______________________________________________ > USRP-users mailing list > USRP-users@lists.ettus.com > http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com _______________________________________________ USRP-users mailing list USRP-users@lists.ettus.com http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
