[USRP-users] USRP x310 with multi_usrp and RFNoC

Martin Braun martin.braun at ettus.com
Fri Feb 22 18:26:05 EST 2019


Armin,

I'd like to learn a little more about this failure. Here's a couple of
questions:
- How many USRPs are you running at once? Does this also happen with a
single USRP?
- Does this also happen when using a vanilla UHD example? Since you're
running a custom RFNOC block, it would be good to eliminate as many
variables as possible. benchmark_rate will exercise the Radio and DDC.

-- M

On Tue, Feb 19, 2019 at 2:42 AM Armin Schmidt via USRP-users <
usrp-users at lists.ettus.com> wrote:

> Hallo,
> We're about to migrate from multi-usrp-application with UHD 3.9 and
> custome FPGA to UHD 3.14 with RFNoC. We are using the USRP x310 with
> daughterboards ubx-160. Everything seems to work fine except that when we
> stop our application in the terminal with ctrl-c, a new startup is only
> possible after a powercycle of all USRP's.
> The problem is, that we can connect our RFNoC-blocks and start streaming,
> but without a powercycle the recv() function starts after several
> successfully received packets to produce continuously the following error
> and hangs in this state:
> [ERROR] [STREAMER] The receive packet handler failed to time-align packets.
> 1002 received packets were processed by the handler.
> However, a timestamp match could not be determined.
>
> For me it is not clear, where to search for the problem. We set sudo
> sysctl net.core.rmem_max=33554432.
>
> Following our code for initializing the USRPS and RFNoC:
>
> //=======================
>     //Setup a RX usrp device:
>     //=======================
>     multiUSRP =
> uhd::usrp::multi_usrp::make(parser.value("args").toStdString());
> //create multi-USRP
>
>     QThread::sleep(1);  //allow for some setup-time
>
>     if(parser.value("args") == "")  //show default values
>     {
>         uhd::device_addr_t hint("");
>         std::vector<uhd::device_addr_t> addresses =
> ((multiUSRP->get_device())->find(hint));
>         QString address =
> QString::fromUtf8((addresses[0].to_string()).c_str());
>         QStringList addressList = address.split(",");
>         QString args = addressList[0] + ",";
>
>         for(int i = 0; i < addresses.size(); i++)
>         {
>             address =
> QString::fromUtf8((addresses[i].to_string()).c_str());
>             addressList = address.split(",");
>             args += "addr" + QString::number(i) + "=" +
> (addressList[1].split("="))[1] + ",";
>         }
>
>         args += "master_clock_rate=" +
> QString::number(multiUSRP->get_master_clock_rate());
>
>         qInfo() << endl << "Creating the RX usrp device with: " << args;
>     }
>
>     else
>     {
>         qInfo() << endl << "Creating the RX usrp device with: " <<
> parser.value("args");
>     }
>
>     usrpDevice = multiUSRP->get_device3();
>     usrpDevice->clear();    //reset device streaming state (resets blocks
> after a stream)
>
>     //======================
>     //Create block controls:
>     //======================
>     std::vector<std::string> blocks;
>     std::string agc0_id, ddc0_id, psd0_id, agc1_id, ddc1_id, psd1_id,
> radio_args, agc_args, ddc_args, streamargs;
>     ddc0_id = "DDC_0";
>
>     //Initialize Radio-blocks:
>     //========================
>     QStringList rx_channel_strings = (parser.value("channels")).split(",");
>     numChannels = rx_channel_strings.size();
>     QVector<uhd::rfnoc::radio_ctrl::sptr> radio_ctrls;
>
>     qInfo() << endl;
>
>     //initializes all m radio controls:
>     for(int i = 0; i < numChannels; i++)
>     {
>         uhd::rfnoc::block_id_t radio_ctrl_id(qFloor(i/2), "Radio", (i %
> 2)); //create on USRP x the radio object for channel 0 or 1
>
> radio_ctrls.append(usrpDevice->get_block_ctrl<uhd::rfnoc::radio_ctrl>(radio_ctrl_id));
> //this line will faile, if radio is not available
>
>         qInfo() << "Using USRP: " << qFloor(i/2) << ", channel: " << (i %
> 2) << endl;
>     }
>
>     //radio_ctrl->set_args(radio_args);
>
>     //Set clock-source:
>     /*for(int i = 0; i < numChannels; i++)
>     {
>         radio_ctrls[i]->set_time_source("external");
>         radio_ctrls[i]->set_clock_source("external");
>     }*/
>     //radio_ctrls[0]->set_time_next_pps()
>
>     multiUSRP->set_time_source("external");
>     multiUSRP->set_clock_source("external");
>     multiUSRP->set_time_unknown_pps(uhd::time_spec_t(0.0));
>     QThread::sleep(1); //wait for pps sync pulse
>
>     //check time synchronization across all motherboards
>     if (multiUSRP->get_time_synchronized())
>     {
>         qInfo() << endl << "Time Synchronization across all Motherboards
> done";
>     }
>
>     else
>     {
>         qInfo() << endl << "Time Synchronization across all Motherboards
> failed";
>         throw "Time Synchronization across all Motherboards failed";
>     }
>
>     //set the RX-antenna:
>     for(int i = 0; i < numChannels; i++)
>     {
>         radio_ctrls[i]->set_rx_antenna("RX2", 0);
>     }
>
>     QThread::sleep(1);  //allow for some setup-time
>
>     //this->set_rx_gain((parser.value("gain")).toDouble());
>     //this->set_rx_freq((parser.value("freq")).toDouble());
>
>
>     //=================
>     //Set-up streaming:
>     //=================
>     uhd::device_addr_t streamer_args(streamargs);
>     std::vector<size_t> rx_channel_nums;
>
>     rx_graph = usrpDevice->create_graph("rx_graph");
>
>     for(int i = 0; i < numChannels; i++)
>     {
>         /*
>         //Check if agc0-block is available:
>         if(!usrpDevice->has_block(agc0_id))
>         {
>             qInfo() << endl << "AGC-block does not exist on current
> device!" << endl;
>         }
>
>         uhd::rfnoc::source_block_ctrl_base::sptr agc0_block_ctrl =
> usrpDevice->get_block_ctrl<uhd::rfnoc::source_block_ctrl_base>(agc0_id);
>         agc0_block_ctrl->set_args(uhd::device_addr_t(agc_args)); //set
> arguments of agc
>         rx_graph->connect(radio_ctrl_id, channel_Nr,
> agc0_block_ctrl->get_block_id(), 0);   //connect channel0 from radio with
> agc0
>         */
>
>
>         //Radio -> DDC:
>         //=============
>
>         //Check if ddc-block is available on current device:
>
> if(!usrpDevice->has_block(uhd::rfnoc::block_id_t(std::to_string(qFloor(i/2))
> + "/DDC_" + std::to_string(i % 2))))
>         {
>             qInfo() << endl << "DDC-block " + QString::number(i % 2) + "
> does not exist on device " + QString::number(qFloor(i/2)) + "!" << endl;
>             throw "DDC-block " + QString::number(i % 2) + " does not exist
> on device " + QString::number(qFloor(i/2)) + "!";
>         }
>
>         uhd::rfnoc::source_block_ctrl_base::sptr ddc_block_ctrl =
> usrpDevice->get_block_ctrl<uhd::rfnoc::source_block_ctrl_base>(uhd::rfnoc::block_id_t(std::to_string(qFloor(i/2))
> + "/DDC_" + std::to_string(i % 2)));
>
>
> ddc_block_ctrl->set_args(uhd::device_addr_t("freq=0,input_rate=184320000,output_rate=46080000"));
> //set arguments of ddc
>         rx_graph->connect(radio_ctrls[i]->get_block_id(), 0,
> ddc_block_ctrl->get_block_id(), 0, 1);   //connect radio with ddc
>
>
>         //DDC -> PSD:
>         //===========
>
>         //Check if psd-block is available:
>
> if(!usrpDevice->has_block(uhd::rfnoc::block_id_t(std::to_string(qFloor(i/2))
> + "/PSD_" + std::to_string(i % 2))))
>         {
>             qInfo() << endl << "PSD-block " + QString::number(i % 2) + "
> does not exist on device " + QString::number(qFloor(i/2)) + "!" << endl;
>             throw "PSD-block " + QString::number(i % 2) + " does not exist
> on device " + QString::number(qFloor(i/2)) + "!";
>         }
>
>         uhd::rfnoc::source_block_ctrl_base::sptr psd_block_ctrl =
> usrpDevice->get_block_ctrl<uhd::rfnoc::source_block_ctrl_base>(std::to_string(qFloor(i/2))
> + "/PSD_" + std::to_string(i % 2));
>         rx_graph->connect(ddc_block_ctrl->get_block_id(), 0,
> psd_block_ctrl->get_block_id(), 0, 1);   //connect ddc with psd
>
>         streamer_args["block_id" + std::to_string(i)] =
> psd_block_ctrl->get_block_id().to_string();    //connects psd to stream
>         streamer_args["block_port" + std::to_string(i)] = "0";
>         rx_channel_nums.push_back(i);
>     }
>
>     samps_per_buff = 256;
>     this->createNewBuffers();   //prepare buffer for streamed data
>
>     //Create a receive streamer:
>     uhd::stream_args_t stream_args("sc16", "sc16");
>     stream_args.channels = rx_channel_nums;
>     stream_args.args = streamer_args;
>     stream_args.args["spp"] = boost::lexical_cast<std::string>(256);
>     rx_stream = usrpDevice->get_rx_stream(stream_args);
>
>     qInfo() << endl << "Begin continuous streaming in " <<
> parser.value("secs") << " seconds...";
>
>     stream_cmd = QSharedPointer<uhd::stream_cmd_t>(new
> uhd::stream_cmd_t(uhd::stream_cmd_t::STREAM_MODE_START_CONTINUOUS));
>
>     stream_cmd->stream_now = false; //controls, when the stream begins.
> When false, the device will begin streaming at a time specified by time_spec
>     stream_cmd->time_spec =
> uhd::time_spec_t(((parser.value("secs")).toDouble()) *
> multiUSRP->get_num_mboards());
>     rx_stream->issue_stream_cmd(*stream_cmd); //tells all channels to
> stream
> _______________________________________________
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