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Diffstat (limited to 'host/examples/rx_multi_samples.cpp')
| -rw-r--r-- | host/examples/rx_multi_samples.cpp | 178 |
1 files changed, 178 insertions, 0 deletions
diff --git a/host/examples/rx_multi_samples.cpp b/host/examples/rx_multi_samples.cpp new file mode 100644 index 000000000..42ef33d70 --- /dev/null +++ b/host/examples/rx_multi_samples.cpp @@ -0,0 +1,178 @@ +// +// Copyright 2011 Ettus Research LLC +// +// This program is free software: you can redistribute it and/or modify +// it under the terms of the GNU General Public License as published by +// the Free Software Foundation, either version 3 of the License, or +// (at your option) any later version. +// +// This program is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +// GNU General Public License for more details. +// +// You should have received a copy of the GNU General Public License +// along with this program. If not, see <http://www.gnu.org/licenses/>. +// + +#include <uhd/utils/thread_priority.hpp> +#include <uhd/utils/safe_main.hpp> +#include <uhd/usrp/multi_usrp.hpp> +#include <boost/program_options.hpp> +#include <boost/format.hpp> +#include <boost/thread.hpp> +#include <iostream> +#include <complex> + +namespace po = boost::program_options; + +int UHD_SAFE_MAIN(int argc, char *argv[]){ + uhd::set_thread_priority_safe(); + + //variables to be set by po + std::string args, sync, subdev; + double seconds_in_future; + size_t total_num_samps; + double rate; + + //setup the program options + po::options_description desc("Allowed options"); + desc.add_options() + ("help", "help message") + ("args", po::value<std::string>(&args)->default_value(""), "single uhd device address args") + ("secs", po::value<double>(&seconds_in_future)->default_value(1.5), "number of seconds in the future to receive") + ("nsamps", po::value<size_t>(&total_num_samps)->default_value(10000), "total number of samples to receive") + ("rate", po::value<double>(&rate)->default_value(100e6/16), "rate of incoming samples") + ("sync", po::value<std::string>(&sync)->default_value("now"), "synchronization method: now, pps, mimo") + ("subdev", po::value<std::string>(&subdev), "subdev spec (homogeneous across motherboards)") + ("dilv", "specify to disable inner-loop verbose") + ; + po::variables_map vm; + po::store(po::parse_command_line(argc, argv, desc), vm); + po::notify(vm); + + //print the help message + if (vm.count("help")){ + std::cout << boost::format("UHD RX Multi Samples %s") % desc << std::endl; + std::cout << + " This is a demonstration of how to receive aligned data from multiple channels.\n" + " This example can receive from multiple DSPs, multiple motherboards, or both.\n" + " The MIMO cable or PPS can be used to synchronize the configuration. See --sync\n" + "\n" + " Specify --subdev to select multiple channels per motherboard.\n" + " Ex: --subdev=\"0:A 0:B\" to get 2 channels on a Basic RX.\n" + "\n" + " Specify --args to select multiple motherboards in a configuration.\n" + " Ex: --args=\"addr0=192.168.10.2, addr1=192.168.10.3\"\n" + << std::endl; + return ~0; + } + + bool verbose = vm.count("dilv") == 0; + + //create a usrp device + std::cout << std::endl; + std::cout << boost::format("Creating the usrp device with: %s...") % args << std::endl; + uhd::usrp::multi_usrp::sptr usrp = uhd::usrp::multi_usrp::make(args); + + //always select the subdevice first, the channel mapping affects the other settings + if (vm.count("subdev")) usrp->set_rx_subdev_spec(subdev); //sets across all mboards + + std::cout << boost::format("Using Device: %s") % usrp->get_pp_string() << std::endl; + + //set the rx sample rate (sets across all channels) + std::cout << boost::format("Setting RX Rate: %f Msps...") % (rate/1e6) << std::endl; + usrp->set_rx_rate(rate); + std::cout << boost::format("Actual RX Rate: %f Msps...") % (usrp->get_rx_rate()/1e6) << std::endl << std::endl; + + std::cout << boost::format("Setting device timestamp to 0...") << std::endl; + if (sync == "now"){ + //This is not a true time lock, the devices will be off by a few RTT. + //Rather, this is just to allow for demonstration of the code below. + usrp->set_time_now(uhd::time_spec_t(0.0)); + } + else if (sync == "pps"){ + usrp->set_time_source("external"); + usrp->set_time_unknown_pps(uhd::time_spec_t(0.0)); + boost::this_thread::sleep(boost::posix_time::seconds(1)); //wait for pps sync pulse + } + else if (sync == "mimo"){ + UHD_ASSERT_THROW(usrp->get_num_mboards() == 2); + + //make mboard 1 a slave over the MIMO Cable + usrp->set_clock_source("mimo", 1); + usrp->set_time_source("mimo", 1); + + //set time on the master (mboard 0) + usrp->set_time_now(uhd::time_spec_t(0.0), 0); + + //sleep a bit while the slave locks its time to the master + boost::this_thread::sleep(boost::posix_time::milliseconds(100)); + } + + //create a receive streamer + //linearly map channels (index0 = channel0, index1 = channel1, ...) + uhd::stream_args_t stream_args("fc32"); //complex floats + for (size_t chan = 0; chan < usrp->get_rx_num_channels(); chan++) + stream_args.channels.push_back(chan); //linear mapping + uhd::rx_streamer::sptr rx_stream = usrp->get_rx_stream(stream_args); + + //setup streaming + std::cout << std::endl; + std::cout << boost::format( + "Begin streaming %u samples, %f seconds in the future..." + ) % total_num_samps % seconds_in_future << std::endl; + uhd::stream_cmd_t stream_cmd(uhd::stream_cmd_t::STREAM_MODE_NUM_SAMPS_AND_DONE); + stream_cmd.num_samps = total_num_samps; + stream_cmd.stream_now = false; + stream_cmd.time_spec = uhd::time_spec_t(seconds_in_future); + usrp->issue_stream_cmd(stream_cmd); //tells all channels to stream + + //meta-data will be filled in by recv() + uhd::rx_metadata_t md; + + //allocate buffers to receive with samples (one buffer per channel) + const size_t samps_per_buff = rx_stream->get_max_num_samps(); + std::vector<std::vector<std::complex<float> > > buffs( + usrp->get_rx_num_channels(), std::vector<std::complex<float> >(samps_per_buff) + ); + + //create a vector of pointers to point to each of the channel buffers + std::vector<std::complex<float> *> buff_ptrs; + for (size_t i = 0; i < buffs.size(); i++) buff_ptrs.push_back(&buffs[i].front()); + + //the first call to recv() will block this many seconds before receiving + double timeout = seconds_in_future + 0.1; //timeout (delay before receive + padding) + + size_t num_acc_samps = 0; //number of accumulated samples + while(num_acc_samps < total_num_samps){ + //receive a single packet + size_t num_rx_samps = rx_stream->recv( + buff_ptrs, samps_per_buff, md, timeout + ); + + //use a small timeout for subsequent packets + timeout = 0.1; + + //handle the error code + if (md.error_code == uhd::rx_metadata_t::ERROR_CODE_TIMEOUT) break; + if (md.error_code != uhd::rx_metadata_t::ERROR_CODE_NONE){ + throw std::runtime_error(str(boost::format( + "Unexpected error code 0x%x" + ) % md.error_code)); + } + + if(verbose) std::cout << boost::format( + "Received packet: %u samples, %u full secs, %f frac secs" + ) % num_rx_samps % md.time_spec.get_full_secs() % md.time_spec.get_frac_secs() << std::endl; + + num_acc_samps += num_rx_samps; + } + + if (num_acc_samps < total_num_samps) std::cerr << "Receive timeout before all samples received..." << std::endl; + + //finished + std::cout << std::endl << "Done!" << std::endl << std::endl; + + return 0; +} |