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EttusResearch / uhd

The USRP™ Hardware Driver Repository
http://uhd.ettus.com
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Adding fft in fpga resulting in CODEC loopback test failed #750

Closed dheller26 closed 5 months ago

dheller26 commented 6 months ago

hello everyone , i'm using the b205mini usrp and I need to implement a fft block on the fpga inside the usrp and pc gets the data in freq domain. I designed my fft using xilinx IP core ver 7.1 and place it in the top module after the b205_io module using it's 12 bits I & Q ports . unfortunately when testing my design in gnuradio i got ERROR CODEC loopback test failed as you can see below.

what can be the problem ? when my design is clean without fft i don't get errors like that . i will appreciate your help. with best regards . Dror Screenshot from 2024-05-12 15-48-31

mbr0wn commented 5 months ago

If you want to put the FFT before b205_io then you need to disable the codec loopback in the UHD driver. Probably much easier to stay on the other side of radio_legacy and work on the rx_t* signals (AXI-stream).