C++ sptr::set_rx_gain方法代码示例

/***********************************************************************
 * Set standard defaults for devices
 **********************************************************************/
static inline void set_optimum_defaults(uhd::usrp::multi_usrp::sptr usrp){
    uhd::property_tree::sptr tree = usrp->get_device()->get_tree();
    // Will work on 1st subdev, top-level must make sure it's the right one
    uhd::usrp::subdev_spec_t subdev_spec = usrp->get_rx_subdev_spec();

    const uhd::fs_path mb_path = "/mboards/0";
    const std::string mb_name = tree->access<std::string>(mb_path / "name").get();
    if (mb_name.find("USRP2") != std::string::npos or mb_name.find("N200") != std::string::npos or mb_name.find("N210") != std::string::npos  or mb_name.find("X300") != std::string::npos  or mb_name.find("X310") != std::string::npos){
        usrp->set_tx_rate(12.5e6);
        usrp->set_rx_rate(12.5e6);
    }
    else if (mb_name.find("B100") != std::string::npos){
        usrp->set_tx_rate(4e6);
        usrp->set_rx_rate(4e6);
    }
    else if (mb_name.find("E100") != std::string::npos or mb_name.find("E110") != std::string::npos){
        usrp->set_tx_rate(4e6);
        usrp->set_rx_rate(8e6);
    }
    else{
        throw std::runtime_error("self-calibration is not supported for this hardware");
    }

    const uhd::fs_path tx_fe_path = "/mboards/0/dboards/" + subdev_spec[0].db_name + "/tx_frontends/0";
    const std::string tx_name = tree->access<std::string>(tx_fe_path / "name").get();
    if (tx_name.find("WBX") != std::string::npos){
        usrp->set_tx_gain(0);
    }
    else if (tx_name.find("SBX") != std::string::npos){
        usrp->set_tx_gain(0);
    }
    else if (tx_name.find("CBX") != std::string::npos){
        usrp->set_tx_gain(0);
    }
    else if (tx_name.find("RFX") != std::string::npos){
        usrp->set_tx_gain(0);
    }
    else{
        throw std::runtime_error("self-calibration is not supported for this hardware");
    }

    const uhd::fs_path rx_fe_path = "/mboards/0/dboards/" + subdev_spec[0].db_name + "/rx_frontends/0";
    const std::string rx_name = tree->access<std::string>(rx_fe_path / "name").get();
    if (rx_name.find("WBX") != std::string::npos){
        usrp->set_rx_gain(25);
    }
    else if (rx_name.find("SBX") != std::string::npos){
        usrp->set_rx_gain(25);
    }
    else if (rx_name.find("CBX") != std::string::npos){
        usrp->set_rx_gain(25);
    }
    else if (rx_name.find("RFX") != std::string::npos){
        usrp->set_rx_gain(25);
    }
    else{
        throw std::runtime_error("self-calibration is not supported for this hardware");
    }

}

double uhd_device::setRxGain(double db)
{
	usrp_dev->set_rx_gain(db);
	rx_gain = usrp_dev->get_rx_gain();

	LOG(INFO) << "Set RX gain to " << rx_gain << "dB";

	return rx_gain;
}

int setup_device(uhd::usrp::multi_usrp::sptr usrp, double rx_gain, double tx_gain, double freq, double rate){

    //create a usrp device
    std::cout << boost::format("Using Device: %s") % usrp->get_pp_string() << std::endl;

    usrp->set_rx_rate(rate);
    usrp->set_rx_freq(freq);
    usrp->set_rx_gain(rx_gain);
	usrp->set_tx_rate(rate);
	usrp->set_tx_freq(freq);
	usrp->set_tx_gain(tx_gain);

}

void init_usrp() {
	cout << "Initial USRP" << endl;
	
	usrp = uhd::usrp::multi_usrp::make(usrp_ip);
	usrp->set_rx_rate(rate);
	usrp->set_tx_rate(rate);

	usrp->set_rx_freq(freq);
	usrp->set_tx_freq(freq);

	usrp->set_rx_gain(gain);
	uhd::meta_range_t rx_range = usrp->get_rx_gain_range();
}

void uhd_device::init_gains()
{
	uhd::gain_range_t range;

	range = usrp_dev->get_tx_gain_range();
	tx_gain_min = range.start();
	tx_gain_max = range.stop();

	range = usrp_dev->get_rx_gain_range();
	rx_gain_min = range.start();
	rx_gain_max = range.stop();

	usrp_dev->set_tx_gain((tx_gain_min + tx_gain_max) / 2);
	usrp_dev->set_rx_gain((rx_gain_min + rx_gain_max) / 2);

	tx_gain = usrp_dev->get_tx_gain();
	rx_gain = usrp_dev->get_rx_gain();

	return;
}

/***********************************************************************
 * Function to find optimal RX gain setting (for the current frequency)
 **********************************************************************/
UHD_INLINE void set_optimal_rx_gain(
    uhd::usrp::multi_usrp::sptr usrp,
    uhd::rx_streamer::sptr rx_stream,
    double wave_freq = 0.0)
{
    const double gain_step = 3.0;
    const double gain_compression_threshold = gain_step * 0.5;
    const double actual_rx_rate = usrp->get_rx_rate();
    const double actual_tx_freq = usrp->get_tx_freq();
    const double actual_rx_freq = usrp->get_rx_freq();
    const double bb_tone_freq = actual_tx_freq - actual_rx_freq + wave_freq;
    const size_t nsamps = size_t(actual_rx_rate / default_fft_bin_size);

    std::vector<samp_type> buff(nsamps);
    uhd::gain_range_t rx_gain_range = usrp->get_rx_gain_range();
    double rx_gain = rx_gain_range.start() + gain_step;
    double curr_dbrms = 0.0;
    double prev_dbrms = 0.0;
    double delta = 0.0;

    // No sense in setting the gain where this is no gain range
    if (rx_gain_range.stop() - rx_gain_range.start() < gain_step)
        return;

    // The algorithm below cycles through the RX gain range
    // looking for the point where the signal begins to get
    // clipped and the gain begins to be compressed.  It does
    // this by looking for the gain setting where the increase
    // in the tone is less than the gain step by more than the
    // gain compression threshold (curr - prev < gain - threshold).

    // Initialize prev_dbrms value
    usrp->set_rx_gain(rx_gain);
    capture_samples(usrp, rx_stream, buff, nsamps);
    prev_dbrms = compute_tone_dbrms(buff, bb_tone_freq/actual_rx_rate);
    rx_gain += gain_step;

    // Find RX gain where signal begins to clip
    while (rx_gain <= rx_gain_range.stop())
    {
        usrp->set_rx_gain(rx_gain);
        capture_samples(usrp, rx_stream, buff, nsamps);
        curr_dbrms = compute_tone_dbrms(buff, bb_tone_freq/actual_rx_rate);
        delta = curr_dbrms - prev_dbrms;

        // check if the gain is compressed beyone the threshold
        if (delta < gain_step - gain_compression_threshold)
            break;  // if so, we are done

        prev_dbrms = curr_dbrms;
        rx_gain += gain_step;
    }

    // The rx_gain value at this point is the gain setting where clipping
    // occurs or the gain setting that is just beyond the gain range.
    // The gain is reduced by 2 steps to make sure it is within the range and
    // under the point where it is clipped with enough room to make adjustments.
    rx_gain -= 2 * gain_step;

    // Make sure the gain is within the range.
    rx_gain = rx_gain_range.clip(rx_gain);

    // Finally, set the gain.
    usrp->set_rx_gain(rx_gain);
}

int setupUSRP(  uhd::usrp::multi_usrp::sptr&  usrp,
                const float                   center_freq,
                const float                   sample_rate,
                const int                     rx_gain,
                const char*                   dev_addr)
{
  //Initialize the USRP to the specified address
  usrp = uhd::usrp::multi_usrp::make(string(dev_addr));
  //Define the clock reference
  usrp->set_clock_source(__USRP_CLK_SRC);

  //Output some useful information
  cout  << "Using the following USRP device: " << endl
        << usrp->get_pp_string() << endl;

  //Try setting the sample rate.  If the rate we get is not the same as the
  //requested rate, we will return with a warning to ensure the user is aware
  //of the actual sample rate
  usrp->set_rx_rate( sample_rate );

  if( usrp->get_rx_rate() != sample_rate )
  {
    ios_base::fmtflags originalFlags = cout.flags();
    cout.setf(ios_base::left,ios_base::floatfield);
    cout.precision(15);
    cout  << "WARNING! Requested rate = " << sample_rate << endl
          << "WARNING! Actual rate = " << usrp->get_rx_rate() << endl;
    cout.setf(originalFlags);
  }

  //Try setting the center frequency.  Like above, if we get a different
  //frequency than the one we're requesting, we will spit out a warning for the
  //user
  usrp->set_rx_freq( center_freq );

  if( usrp->get_rx_freq() != center_freq )
  {
    ios_base::fmtflags originalFlags = cout.flags();
    cout.setf(ios_base::left,ios_base::floatfield);
    cout.precision(15);
    cout  << "WARNING! Requested frequency = " << center_freq << endl
          << "WARNING! Actual frequency = " << usrp->get_rx_freq() << endl;
    cout.setf(originalFlags);
  }

  //Set the RX gain.  There really shouldn't be any problems here, but the user
  //might request something silly like 50dB of gain when the module can't
  //accomodate.  So we'll perform a similar check here.
  usrp->set_rx_gain( rx_gain );

  if( usrp->get_rx_gain() != rx_gain )
  {
    cout  << "WARNING! Requested gain = " << rx_gain << endl
          << "WARNING! Actual gain = " << usrp->get_rx_gain() << endl;
  }

  //Ensure the LO locked
  vector<string> sensor_names;
  sensor_names = usrp->get_rx_sensor_names(0);
  if( find(sensor_names.begin(), sensor_names.end(), "lo_locked")
      != sensor_names.end() )
  {
    uhd::sensor_value_t lo_locked = usrp->get_rx_sensor("lo_locked",0);
    cout  << "Checking RX: " << endl
          << lo_locked.to_pp_string() << endl;
    UHD_ASSERT_THROW(lo_locked.to_bool());      //We should probably catch this
  }

  return 1;
}