With this FFT block, you need to set the SPP to match the FFT size for it to work correctly. I'm not very familiar with GNU Radio but I think there is an SPP parameter on the RX radio. I don't know how to set it for TX.
Wade On Wed, Oct 23, 2024 at 5:45 AM Nidhi Panda <nidhi.pa...@cyronics.com> wrote: > Hello, > > I am having USRP X300 device with following tool versions: > > Vivado 2021.1 - AR76780n, > GNU radio version - v3.11.0.0git-820-g2adbd4ea > UHD version - UHD_4.7.0.0-84-gbdada1ed > > I have added FFT and Spliter RFNoC blocks in my bit file. The > "uhd_usrp_probe" command shows correct connection in the blocks. > > | | RFNoC blocks on this device: > | | > | | * 0/DDC#0 > | | * 0/FFT#0 > | | * 0/Radio#0 > | | * 0/Replay#0 > | | * 0/SplitStream#0 > | _____________________________________________________ > | / > | | Static connections on this device: > > | | * 0/Radio#0:0==>0/DDC#0:0 > | | * 0/Radio#0:1==>0/DDC#0:1 > | | * 0/DDC#0:1==>0/SEP#0:0 > | | * 0/DDC#0:0==>0/SplitStream#0:0 > | | * 0/SplitStream#0:1==>0/FFT#0:0 > | | * 0/SplitStream#0:0==>0/SEP#2:0 > | | * 0/FFT#0:0==>0/SEP#1:0 > | | * 0/SEP#3:0==>0/Replay#0:0 > | | * 0/Replay#0:0==>0/SEP#3:0 > | | * 0/SEP#4:0==>0/Replay#0:1 > | | * 0/Replay#0:1==>0/SEP#4:0 > > However, on running example code available on GNURADIO > *"rfnoc_split_stream.grc"*. I get following error: > > *1. When FFT size = 1024 (as in the example given in gnu radio)* > > > > *--------------------------------------------------------------------------------------------------------------------------* > > > > > > > > > > *[ERROR] [RxStreamer#0] Cannot resolve spp! Must be a multiple of 1024 but > max value is 364Traceback (most recent call last): File > "/home/quasar/gnuradio/gr-uhd/examples/grc/rfnoc_split_stream.py", line > 347, in <module> main() File > "/home/quasar/gnuradio/gr-uhd/examples/grc/rfnoc_split_stream.py", line > 326, in main tb.start() File > "/usr/local/lib/python3.8/dist-packages/gnuradio/gr/top_block.py", line > 116, in start top_block_start_unlocked(self._impl, > max_noutput_items)RuntimeError: ValueError: Samples per packet is > incompatible with atomic item size!* > > > *--------------------------------------------------------------------------------------------------------------------------* > How to know what is atomic size and how can I set it. On searching for > this error I came across following link: > > *https://github.com/EttusResearch/uhd/commit/f163af41a47ab4c702ffbdb10352cf875d604d74 > <https://github.com/EttusResearch/uhd/commit/f163af41a47ab4c702ffbdb10352cf875d604d74>* > > This says rx stream is having a bug and AIS is in unit bytes, and spp in > unit items. It was a response of two years back with the uhd version > v4.3.0.0-rc1 > <https://github.com/EttusResearch/uhd/releases/tag/v4.3.0.0-rc1>. Does > this explanation still hold? What is the max FFT size I can use? I want to > use *2048*, what changes need to be done for it. > > *1. When FFT size = 256* > > > *--------------------------------------------------------------------------------------------------------------------------* > > > > > > > > > > *[ERROR] [RFNOC::GRAPH::DETAIL] The following properties could not be > resolved:[ERROR] [RFNOC::GRAPH::DETAIL] Dirty: RxStreamer#1[INPUT_EDGE:0 > atomic_item_size]Traceback (most recent call last): File > "/home/quasar/gnuradio/gr-uhd/examples/grc/rfnoc_split_stream.py", line > 347, in <module> main() File > "/home/quasar/gnuradio/gr-uhd/examples/grc/rfnoc_split_stream.py", line > 326, in main tb.start() File > "/usr/local/lib/python3.8/dist-packages/gnuradio/gr/top_block.py", line > 116, in start top_block_start_unlocked(self._impl, > max_noutput_items)RuntimeError: RfnocError: ResolveError: Could not resolve > properties.* > > > *--------------------------------------------------------------------------------------------------------------------------* > > Am I doing anything wrong in the yml script because the connection seems > correct in the uhd_usrp_probe command. On further searching I found that > SPP i.e. sample per packet must be the same for all the blocks. Tried doing > it in gnu radio by assigning the args option with f"spp={fft_size}". Is > this correct? It gives no change in error howver I get additional warning > as > > [WARNING] [0/FFT#0] set_properties() cannot set property `spp': No such > property. > [WARNING] [0/DDC#0] set_properties() cannot set property `spp': No such > property. > > > Please help me to solve these errors. > > -- > Regards, > *Nidhi Panda* > > *Cyronics Innovation Labs Pvt Ltd* > #11, Electronics Co-op Estate > Satara Road, Pune - 411009 > > _______________________________________________ > USRP-users mailing list -- usrp-users@lists.ettus.com > To unsubscribe send an email to usrp-users-le...@lists.ettus.com >
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