/***********************************************************************
* RX Hammer
**********************************************************************/
void rx_hammer(uhd::usrp::multi_usrp::sptr usrp, const std::string &rx_cpu, uhd::rx_streamer::sptr rx_stream){
uhd::set_thread_priority_safe();
//print pre-test summary
std::cout << boost::format(
"Testing receive rate %f Msps"
) % (usrp->get_rx_rate()/1e6) << std::endl;
//setup variables and allocate buffer
uhd::rx_metadata_t md;
const size_t max_samps_per_packet = rx_stream->get_max_num_samps();
std::vector<char> buff(max_samps_per_packet*uhd::convert::get_bytes_per_item(rx_cpu));
std::vector<void *> buffs;
for (size_t ch = 0; ch < rx_stream->get_num_channels(); ch++)
buffs.push_back(&buff.front()); //same buffer for each channel
bool had_an_overflow = false;
uhd::time_spec_t last_time;
const double rate = usrp->get_rx_rate();
double timeout = 1;
uhd::stream_cmd_t cmd(uhd::stream_cmd_t::STREAM_MODE_NUM_SAMPS_AND_DONE);
cmd.time_spec = usrp->get_time_now() + uhd::time_spec_t(0.05);
cmd.stream_now = (buffs.size() == 1);
srand( time(NULL) );
while (not boost::this_thread::interruption_requested()){
cmd.num_samps = rand() % 100000;
rx_stream->issue_stream_cmd(cmd);
num_rx_samps += rx_stream->recv(buffs, max_samps_per_packet, md, timeout, true);
//handle the error codes
switch(md.error_code){
case uhd::rx_metadata_t::ERROR_CODE_NONE:
if (had_an_overflow){
had_an_overflow = false;
num_dropped_samps += boost::math::iround((md.time_spec - last_time).get_real_secs()*rate);
}
break;
case uhd::rx_metadata_t::ERROR_CODE_OVERFLOW:
had_an_overflow = true;
last_time = md.time_spec;
if (!md.out_of_sequence)
num_overflows++;
break;
default:
std::cerr << "Receiver error: " << md.strerror() << std::endl;
std::cerr << "Unexpected error on recv, continuing..." << std::endl;
break;
}
}
}
/***********************************************************************
* Benchmark RX Rate
**********************************************************************/
void benchmark_rx_rate(
uhd::usrp::multi_usrp::sptr usrp,
const std::string &rx_cpu,
uhd::rx_streamer::sptr rx_stream,
bool random_nsamps,
const boost::posix_time::ptime &start_time,
std::atomic<bool>& burst_timer_elapsed
) {
uhd::set_thread_priority_safe();
//print pre-test summary
std::cout << boost::format(
"[%s] Testing receive rate %f Msps on %u channels"
) % NOW() % (usrp->get_rx_rate()/1e6) % rx_stream->get_num_channels() << std::endl;
//setup variables and allocate buffer
uhd::rx_metadata_t md;
const size_t max_samps_per_packet = rx_stream->get_max_num_samps();
std::vector<char> buff(max_samps_per_packet*uhd::convert::get_bytes_per_item(rx_cpu));
std::vector<void *> buffs;
for (size_t ch = 0; ch < rx_stream->get_num_channels(); ch++)
buffs.push_back(&buff.front()); //same buffer for each channel
bool had_an_overflow = false;
uhd::time_spec_t last_time;
const double rate = usrp->get_rx_rate();
uhd::stream_cmd_t cmd(uhd::stream_cmd_t::STREAM_MODE_START_CONTINUOUS);
cmd.time_spec = usrp->get_time_now() + uhd::time_spec_t(INIT_DELAY);
cmd.stream_now = (buffs.size() == 1);
rx_stream->issue_stream_cmd(cmd);
const float burst_pkt_time =
std::max<float>(0.100f, (2 * max_samps_per_packet/rate));
float recv_timeout = burst_pkt_time + INIT_DELAY;
bool stop_called = false;
while (true) {
//if (burst_timer_elapsed.load(boost::memory_order_relaxed) and not stop_called) {
if (burst_timer_elapsed and not stop_called) {
rx_stream->issue_stream_cmd(uhd::stream_cmd_t::STREAM_MODE_STOP_CONTINUOUS);
stop_called = true;
}
if (random_nsamps) {
cmd.num_samps = rand() % max_samps_per_packet;
rx_stream->issue_stream_cmd(cmd);
}
try {
num_rx_samps += rx_stream->recv(buffs, max_samps_per_packet, md, recv_timeout)*rx_stream->get_num_channels();
recv_timeout = burst_pkt_time;
}
catch (uhd::io_error &e) {
std::cerr << "[" << NOW() << "] Caught an IO exception. " << std::endl;
std::cerr << e.what() << std::endl;
return;
}
//handle the error codes
switch(md.error_code){
case uhd::rx_metadata_t::ERROR_CODE_NONE:
if (had_an_overflow) {
had_an_overflow = false;
const long dropped_samps =
(md.time_spec - last_time).to_ticks(rate);
if (dropped_samps < 0) {
std::cerr
<< "[" << NOW() << "] Timestamp after overrun recovery "
"ahead of error timestamp! Unable to calculate "
"number of dropped samples."
"(Delta: " << dropped_samps << " ticks)\n";
}
num_dropped_samps += std::max<long>(1, dropped_samps);
}
if ((burst_timer_elapsed or stop_called) and md.end_of_burst) {
return;
}
break;
// ERROR_CODE_OVERFLOW can indicate overflow or sequence error
case uhd::rx_metadata_t::ERROR_CODE_OVERFLOW:
last_time = md.time_spec;
had_an_overflow = true;
// check out_of_sequence flag to see if it was a sequence error or overflow
if (!md.out_of_sequence) {
num_overruns++;
} else {
num_seqrx_errors++;
std::cerr << "[" << NOW() << "] Detected Rx sequence error." << std::endl;
}
break;
case uhd::rx_metadata_t::ERROR_CODE_LATE_COMMAND:
std::cerr << "[" << NOW() << "] Receiver error: " << md.strerror() << ", restart streaming..."<< std::endl;
num_late_commands++;
// Radio core will be in the idle state. Issue stream command to restart streaming.
cmd.time_spec = usrp->get_time_now() + uhd::time_spec_t(0.05);
cmd.stream_now = (buffs.size() == 1);
rx_stream->issue_stream_cmd(cmd);
break;
case uhd::rx_metadata_t::ERROR_CODE_TIMEOUT:
if (burst_timer_elapsed) {
return;
}
std::cerr << "[" << NOW() << "] Receiver error: " << md.strerror() << ", continuing..." << std::endl;
num_timeouts_rx++;
break;
// Otherwise, it's an error
default:
std::cerr << "[" << NOW() << "] Receiver error: " << md.strerror() << std::endl;
std::cerr << "[" << NOW() << "] Unexpected error on recv, continuing..." << std::endl;
break;
}
}
}