Jason, this is a tough one. I have no ideas, other than 'throw in a couple of ILAs and see where it's stuck'.
-- M On 07/23/2018 12:03 PM, Jason Matusiak via USRP-users wrote: > I have a flowgraph with a custom RFNoC block in the middle. That block > has 2 inputs and 2 outputs. Just to get started and work out the MIMO > functionality, all I do is cross the the inputs to the outputs (so input > 0 comes out output 1). > > What I am seeing is that if I run the flowgraph after loading a fresh > bitfile, I don't get anything out of my output who should be passing the > data from an RFNoC radio->DDC and I see "timeout on chan 0" scrolling > past on the screen. But, if I run the same flowgraph a second time, it > suddenly works fine (as well as subsequent runs afterwards until I > reload the bitfile). > > It doesn't matter if I swap the inputs to the special block, it always > reads "timeout on chan 0" and the output stream on my block that should > be displaying that data is dead the first run after a reload. > > I am guessing that "timeout on chan 0" is releated to either the Radio > or DDC block as it is consistently 0 even when I move it around on my 2 > inputs (if I pull out the DDC, I see the same issues, so it seems to be > something between the radio and my block). > > That said, I don't see this issue if I run the rfnoc_ddc.grc example > from Ettus which also uses a Radio and DDC. > > I could believe that it has something to do with a reset in my block > (like the fact that there are two clear_tx_seqnum flags), I am just > confused why the issue moves around depending on where the rfnoc/ddc is > connected (yet the timeout does not). > > If I remove the radio/ddc and use an rfnoc split stream to take my GR > signal source, I don't see these issues. So I cannot figure out what is > not playing nicely between my block and the RFNoC radio. BUT... If I go > from the radio into a split stream to my two inputs, it works right the > first time, and then doesn't work again after that (so almost the > reverse issue as I've started with, but I REALLY feel like something > with my block dealing with 2 inputs and 2 outputs is causing this issue. > > > > > _______________________________________________ > 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
