uhd: created rx_multi_samples for multi-channel example

1 files changed, 158 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..e820343ca
--- /dev/null
+++ b/host/examples/rx_multi_samples.cpp
@@ -0,0 +1,158 @@
+//
+// 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")
+        ("subdev", po::value<std::string>(&subdev)->default_value(""), "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"){
+        usrp->set_time_now(uhd::time_spec_t(0.0));
+        boost::this_thread::sleep(boost::posix_time::milliseconds(50)); //wait for mimo cable time sync
+    }
+    else if (sync == "pps"){
+        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
+    }
+
+    //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)
+    size_t samps_per_buff = usrp->get_device()->get_max_recv_samps_per_packet();
+    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 = usrp->get_device()->recv(
+            buff_ptrs, samps_per_buff, md,
+            uhd::io_type_t::COMPLEX_FLOAT32,
+            uhd::device::RECV_MODE_ONE_PACKET, 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;
+}