Hi Andrew, AXI Wrapper's SIMPLE_MODE can only be used with blocks that do not perform a rate change. Since you are using keep_one_in_n, your block is performing a decimation of sorts, so you cannot use SIMPLE_MODE. You should manually set up the header on tuser using noc_block_keep_one_in_n.v as an example. This may be the cause of your problem.
Jonathon On Wed, Jul 8, 2020 at 7:26 PM Andrew Payne via USRP-users < [email protected]> wrote: > Actually I have found a clue! In > usrp3/lib/rfnoc/noc_block_keep_one_in_n.v, axi_wrapper simple_mode is > set to off, instead opting to use cvita_hdr_modify. I opted to use > keep_one_in_n.v in my custom noc_block, BUT, I have set simple mode to > 1. And if I go into usrp3/lib/rfnoc/axi_wrapper.v, at the top the > comments for SIMPLE_MODE say "Automatically handle header > (s_axis_data_tuser), packets must be consumed / produced 1-to-1". > What does this mean? That the CEs installed at the crossbar are all > beholden to the rate of this CE? Because remember with my issue, my > custom RFNOC block (which incorporates keep_one_in_n.v with simple > mode enabled) works well, the TX with DUC alone works well, but TX > with DUC and FIFO plus my custom RFNOC block seems to greatly > attenuate TX. Could the TX stream be slowed down by my custom RFNOC > CE? > > On Wed, Jul 8, 2020 at 4:37 PM Andrew Payne <[email protected]> wrote: > > > > I have an issue with my setup I'm hoping to solve. > > > > I have an e310 running the UHD 3.15 LTS image. > > > > I have created one custom RFNOC block, which has 2 RX streams, and it > > is composed of the following chain: complex to magnitude ---> moving > > sum ---> keep one in n (n=2048) ---> FIFO with input parameter SIZE=5, > > so then I don't need the RFNOC FIFO block to save space when > > generating the FPGA image file. The moving sum block generates a sum > > from a power of 2 samples, then I feed the keep one in n block with a > > resulting sum whose LSBs are truncated, effectively dividing by a > > power of 2 to effectively generate a moving average. I am using the > > AXI Wrapper with Simple Mode, noc shell, etc, all generated from the > > rfnoc mod tool. > > > > It works great, but I also have a TX output signal, just a sine wave, > > in my gnuradio flowgraph. Its output, depending on the RF center > > frequency, is greatly attenuated (the greatest I can get it is like > > -39dBm, but it falls off to -55). But if I just have the TX output > > alone without my RX RFNOC block, I can get the output over 0dBm or > > more, haven't tried going higher than that. > > > > My question is, how can I get the TX signal higher with my full duplex > > RFNOC setup? Could anything about the RX chain be affecting my TX > > samples, like could it be somehow deleting samples? Do I need to tag > > the streams in GNURadio so they don't interfere or something? > > > > Thanks, > > Andrew > > _______________________________________________ > USRP-users mailing list > [email protected] > http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com >
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