Hi, I just realized that even one instance of TX_sample_from_file from the internal Linux is a no go.
In fact I think I was in a thread about this very subject a few months ago. Someone explicitly said the ARM cpu would be too weak to stream samples. Even streaming one file at the lowest possible sampling rate got 100% underflow. I'm trying to avoid gnuradio for this situation because that would require borrowing a bunch of laptops and finding some Ethernet to USB adapters. I guess that is the best option as my FPGA knowledge is too limited to go down the custom RFNoC route. Thanks for the help. On Wed, Feb 6, 2019 at 3:12 PM Rob Kossler <rkoss...@nd.edu> wrote: > Hi Ali, > A few comments... > 1) perhaps use gnuradio and attach four file source blocks to the usrp. > This is probably the easiest. > 2) perhaps modify the tx_samples_from_file as you suggested. If you want > to go this route, I may be able to dig up some old code where we did this. > 3) In either case above, is there a bandwidth limitation from the N310 CPU > to the FPGA that may make these unsuitable? > 4) perhaps use custom RFNoC image with the 'replay' block. This would > work great if you don't have to control the channel-to-channel relative > timing (the replay block doesn't support). But, the drawback is you would > have to be able to compile such an image and you would likely want to use > gnuradio/gr-ettus to run on the CPU because it is non-trivial to control a > custom RFNoC image from UHD. > > Rob > > > On Wed, Feb 6, 2019 at 5:15 PM Ali Dormiani via USRP-users < > usrp-users@lists.ettus.com> wrote: > >> Hello everyone, >> >> I'm trying to set up a few N310's in neighboring buildings. I want each >> N310 to be its own 4 TX transmitter. >> >> For space and cost reasons I am putting the waveforms (in binary float32) >> directly on the SD card filesystem. My goal is to have each N310 send the >> waveform on loop indefinitely. >> >> So I have 4 .bin files that I want to transmit, one per TX. >> >> I'm not proficient in c++ but the provided tx_sample_from_file seems to >> only work with one file-antenna pair. >> >> Could I make a script that runs 4 duplicate commands with different >> arguments? I suspect the MPM claiming system would not like this though. >> >> Otherwise, is modifying the the example c++ (add more file and antenna >> arguments) the best path forward? >> >> Thank you all for your time, >> >> Ali >> _______________________________________________ >> USRP-users mailing list >> USRP-users@lists.ettus.com >> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com >> >
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