1 files changed, 128 insertions, 0 deletions
diff --git a/host/examples/tx_timed_samples.cpp b/host/examples/tx_timed_samples.cpp
new file mode 100644
index 000000000..3b8cc75d4
--- /dev/null
+++ b/host/examples/tx_timed_samples.cpp
@@ -0,0 +1,128 @@
+//
+// Copyright 2010-2011 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/thread/thread.hpp>
+#include <boost/format.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;
+    double seconds_in_future;
+    size_t total_num_samps;
+    double rate;
+    float ampl;
+
+    //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 transmit")
+        ("nsamps", po::value<size_t>(&total_num_samps)->default_value(10000), "total number of samples to transmit")
+        ("rate", po::value<double>(&rate)->default_value(100e6/16), "rate of outgoing samples")
+        ("ampl", po::value<float>(&ampl)->default_value(float(0.3)), "amplitude of each sample")
+        ("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 TX Timed Samples %s") % desc << 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);
+    std::cout << boost::format("Using Device: %s") % usrp->get_pp_string() << std::endl;
+
+    //set the tx sample rate
+    std::cout << boost::format("Setting TX Rate: %f Msps...") % (rate/1e6) << std::endl;
+    usrp->set_tx_rate(rate);
+    std::cout << boost::format("Actual TX Rate: %f Msps...") % (usrp->get_tx_rate()/1e6) << std::endl << std::endl;
+
+    std::cout << boost::format("Setting device timestamp to 0...") << std::endl;
+    usrp->set_time_now(uhd::time_spec_t(0.0));
+
+    //create a transmit streamer
+    uhd::stream_args_t stream_args("fc32"); //complex floats
+    uhd::tx_streamer::sptr tx_stream = usrp->get_tx_stream(stream_args);
+
+    //allocate buffer with data to send
+    std::vector<std::complex<float> > buff(tx_stream->get_max_num_samps(), std::complex<float>(ampl, ampl));
+
+    //setup metadata for the first packet
+    uhd::tx_metadata_t md;
+    md.start_of_burst = false;
+    md.end_of_burst = false;
+    md.has_time_spec = true;
+    md.time_spec = uhd::time_spec_t(seconds_in_future);
+
+    //the first call to send() will block this many seconds before sending:
+    const double timeout = seconds_in_future + 0.1; //timeout (delay before transmit + padding)
+
+    size_t num_acc_samps = 0; //number of accumulated samples
+    while(num_acc_samps < total_num_samps){
+        size_t samps_to_send = std::min(total_num_samps - num_acc_samps, buff.size());
+
+        //send a single packet
+        size_t num_tx_samps = tx_stream->send(
+            &buff.front(), samps_to_send, md, timeout
+        );
+
+        //do not use time spec for subsequent packets
+        md.has_time_spec = false;
+
+        if (num_tx_samps < samps_to_send) std::cerr << "Send timeout..." << std::endl;
+        if(verbose) std::cout << boost::format("Sent packet: %u samples") % num_tx_samps << std::endl;
+
+        num_acc_samps += num_tx_samps;
+    }
+
+    //send a mini EOB packet
+    md.end_of_burst   = true;
+    tx_stream->send("", 0, md);
+
+    std::cout << std::endl << "Waiting for async burst ACK... " << std::flush;
+    uhd::async_metadata_t async_md;
+    bool got_async_burst_ack = false;
+    //loop through all messages for the ACK packet (may have underflow messages in queue)
+    while (not got_async_burst_ack and usrp->get_device()->recv_async_msg(async_md, timeout)){
+        got_async_burst_ack = (async_md.event_code == uhd::async_metadata_t::EVENT_CODE_BURST_ACK);
+    }
+    std::cout << (got_async_burst_ack? "success" : "fail") << std::endl;
+
+    //finished
+    std::cout << std::endl << "Done!" << std::endl << std::endl;
+
+    return 0;
+}