Hi,
I've an Ettus E310 with UHD 3.13.1.0
I need to receive some samples both in time domain than frequency
domain. I’m trying to do that using this rfnoc graph:
+---------+ +--------------+
| | | |---------------------> RxStreamer Ch 0
| Radio |------->| SplitStream | +-------+
| | | |------>| FFT |-----> RxStreamer Ch 1
+---------+ +--------------+ +-------+
uhd::rfnoc::block_id_t radio_ctrl_id(0, "Radio", 0);
uhd::rfnoc::block_id_t split_ctrl_id(0, "SplitStream", 0);
uhd::rfnoc::block_id_t fft_ctrl_id(0, "FFT", 0);
uhd::rfnoc::source_block_ctrl_base::sptr fft_blk_ctrl =
m_Usrp->get_block_ctrl<uhd::rfnoc::source_block_ctrl_base>(fft_ctrl_id);
m_RadioCtrl = m_Usrp->get_block_ctrl< uhd::rfnoc::radio_ctrl
>(radio_ctrl_id);
m_RadioCtrl->set_rate(16e6);
m_RadioCtrl->set_arg<int>("spp", 2048);
fft_blk_ctrl->set_arg<int>("spp", 2048);
m_Usrp->clear();
m_Graph = m_Usrp->create_graph("rfnoc_rx");
m_Graph->connect(radio_ctrl_id, 0, split_ctrl_id, 0);
m_Graph->connect(split_ctrl_id, 1, fft_ctrl_id, 0);
uhd::device_addr_t streamer_args("");
streamer_args["block_id0"] = split_ctrl_id.to_string();
streamer_args["block_port0"] = str(boost::format("%d") % 0);
streamer_args["block_id1"] = fft_ctrl_id.to_string();
streamer_args["block_port1"] = str(boost::format("%d") % 0);
uhd::stream_args_t stream_args_fc32("sc16", "sc16");
stream_args_fc32.channels = { 0, 1 };
stream_args_fc32.args = streamer_args;
stream_args_fc32.args["spp"] = boost::lexical_cast<std::string>(2048);
m_RxStreamerFc32 = m_Usrp->get_rx_stream(stream_args_fc32);
I need to receive a burst in a precise moment, elaborate it and restart
on a different frequency (I need also to change radio channel because
I've two different antennas).
I've tried
uhd::stream_cmd_t
stream_cmd(uhd::stream_cmd_t::STREAM_MODE_NUM_SAMPS_AND_DONE);
stream_cmd.num_samps = size_t(nBurstLen*MAX_DIM_SAMPLES_FRAME_FOR_RSA);
stream_cmd.stream_now = false;
stream_cmd.time_spec = m_RadioCtrl->get_time_now()+1.0;
m_RxStreamerFc32->issue_stream_cmd(stream_cmd);
but the receive fails with ERROR_CODE_LATE_COMMAND.
I've tried issuing the STREAM_MODE_START_CONTINUOUS command and it seems
to work correctly until I don't send a STREAM_MODE_STOP_CONTINUOUS command.
After a STREAM_MODE_STOP_CONTINUOUS command I flush the buffer with a
receive loop:
while(m_RxStreamerFc32->recv(buff, 2048, uselessMd, 0.010, false));
The problem I'm observing is that since second start the FFT samples
lost alignment with the time samples and after some stop and start the
receive fails often with Overflow errors and than stops definitely to
work with Timeout errors
Someone else have this problem?
Regards,
Luca
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