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-rw-r--r--host/lib/usrp/cores/rx_frontend_core_200.cpp4
-rw-r--r--host/lib/usrp/cores/tx_frontend_core_200.cpp4
-rw-r--r--host/lib/usrp/multi_usrp.cpp11
-rw-r--r--host/utils/usrp_gen_db_cal_table.cpp215
4 files changed, 164 insertions, 70 deletions
diff --git a/host/lib/usrp/cores/rx_frontend_core_200.cpp b/host/lib/usrp/cores/rx_frontend_core_200.cpp
index d42022947..d6396ef45 100644
--- a/host/lib/usrp/cores/rx_frontend_core_200.cpp
+++ b/host/lib/usrp/cores/rx_frontend_core_200.cpp
@@ -64,8 +64,8 @@ public:
}
void set_iq_balance(const std::complex<double> &cor){
- _iface->poke32(REG_RX_FE_MAG_CORRECTION, fs_to_bits(std::abs(cor), 18));
- _iface->poke32(REG_RX_FE_PHASE_CORRECTION, fs_to_bits(std::atan2(cor.real(), cor.imag()), 18));
+ _iface->poke32(REG_RX_FE_MAG_CORRECTION, fs_to_bits(std::abs(cor) - 1, 18));
+ _iface->poke32(REG_RX_FE_PHASE_CORRECTION, fs_to_bits(std::arg(cor)/6.28318531, 18));
}
private:
diff --git a/host/lib/usrp/cores/tx_frontend_core_200.cpp b/host/lib/usrp/cores/tx_frontend_core_200.cpp
index 327e8d344..b90281d9f 100644
--- a/host/lib/usrp/cores/tx_frontend_core_200.cpp
+++ b/host/lib/usrp/cores/tx_frontend_core_200.cpp
@@ -62,8 +62,8 @@ public:
}
void set_iq_balance(const std::complex<double> &cor){
- _iface->poke32(REG_TX_FE_MAG_CORRECTION, fs_to_bits(std::abs(cor), 18));
- _iface->poke32(REG_TX_FE_PHASE_CORRECTION, fs_to_bits(std::atan2(cor.real(), cor.imag()), 18));
+ _iface->poke32(REG_TX_FE_MAG_CORRECTION, fs_to_bits(std::abs(cor) - 1, 18));
+ _iface->poke32(REG_TX_FE_PHASE_CORRECTION, fs_to_bits(std::arg(cor)/6.28318531, 18));
}
private:
diff --git a/host/lib/usrp/multi_usrp.cpp b/host/lib/usrp/multi_usrp.cpp
index 1110f5ebd..6fd60fb6f 100644
--- a/host/lib/usrp/multi_usrp.cpp
+++ b/host/lib/usrp/multi_usrp.cpp
@@ -50,10 +50,15 @@ static void do_samp_rate_warning_message(
}
static void do_tune_freq_warning_message(
- double target_freq,
+ const tune_request_t &tune_req,
double actual_freq,
const std::string &xx
){
+ //forget the warning when manual policy
+ if (tune_req.dsp_freq_policy == tune_request_t::POLICY_MANUAL) return;
+ if (tune_req.rf_freq_policy == tune_request_t::POLICY_MANUAL) return;
+
+ const double target_freq = tune_req.target_freq;
static const double max_allowed_error = 1.0; //Hz
if (std::abs(target_freq - actual_freq) > max_allowed_error){
UHD_MSG(warning) << boost::format(
@@ -486,7 +491,7 @@ public:
tune_result_t set_rx_freq(const tune_request_t &tune_request, size_t chan){
tune_result_t r = tune_xx_subdev_and_dsp(RX_SIGN, _tree->subtree(rx_dsp_root(chan)), _tree->subtree(rx_rf_fe_root(chan)), tune_request);
- do_tune_freq_warning_message(tune_request.target_freq, get_rx_freq(chan), "RX");
+ do_tune_freq_warning_message(tune_request, get_rx_freq(chan), "RX");
return r;
}
@@ -634,7 +639,7 @@ public:
tune_result_t set_tx_freq(const tune_request_t &tune_request, size_t chan){
tune_result_t r = tune_xx_subdev_and_dsp(TX_SIGN, _tree->subtree(tx_dsp_root(chan)), _tree->subtree(tx_rf_fe_root(chan)), tune_request);
- do_tune_freq_warning_message(tune_request.target_freq, get_tx_freq(chan), "TX");
+ do_tune_freq_warning_message(tune_request, get_tx_freq(chan), "TX");
return r;
}
diff --git a/host/utils/usrp_gen_db_cal_table.cpp b/host/utils/usrp_gen_db_cal_table.cpp
index 8fb3be020..100e2368e 100644
--- a/host/utils/usrp_gen_db_cal_table.cpp
+++ b/host/utils/usrp_gen_db_cal_table.cpp
@@ -36,8 +36,6 @@ static const double e = 2.71828183;
static const double tau = 6.28318531;
static const double alpha = 0.0001; //very tight iir filter
static const size_t wave_table_len = 8192;
-static const float ampl = 0.7; //transmitted wave amplitude
-static const double tx_wave_freq = 507.123e3; //freq of tx sine wave in Hz
/***********************************************************************
* Sinusoid wave table
@@ -51,7 +49,7 @@ static std::vector<std::complex<float> > gen_table(void){
//compute i and q pairs with 90% offset and scale to amplitude
for (size_t i = 0; i < wave_table_len; i++){
const size_t q = (i+(3*wave_table_len)/4)%wave_table_len;
- wave_table[i] = std::complex<float>(ampl*real_wave_table[i], ampl*real_wave_table[q]);
+ wave_table[i] = std::complex<float>(real_wave_table[i], real_wave_table[q]);
}
return wave_table;
@@ -96,7 +94,7 @@ static double compute_tone_dbrms(
/***********************************************************************
* Transmit thread
**********************************************************************/
-static void tx_thread(uhd::usrp::multi_usrp::sptr usrp){
+static void tx_thread(uhd::usrp::multi_usrp::sptr usrp, const double tx_wave_freq, const double tx_wave_ampl){
uhd::set_thread_priority_safe();
//create a transmit streamer
@@ -116,7 +114,7 @@ static void tx_thread(uhd::usrp::multi_usrp::sptr usrp){
//fill buff and send until interrupted
while (not boost::this_thread::interruption_requested()){
for (size_t i = 0; i < buff.size(); i++){
- buff[i] = wave_table_lookup(index);
+ buff[i] = float(tx_wave_ampl) * wave_table_lookup(index);
index += step;
}
tx_stream->send(&buff.front(), buff.size(), md);
@@ -128,17 +126,70 @@ static void tx_thread(uhd::usrp::multi_usrp::sptr usrp){
}
/***********************************************************************
+ * Tune RX and TX routine
+ **********************************************************************/
+static void tune_rx_and_tx(uhd::usrp::multi_usrp::sptr usrp, const double tx_lo_freq, const double rx_offset){
+ //tune the transmitter with no cordic
+ uhd::tune_request_t tx_tune_req(tx_lo_freq);
+ tx_tune_req.dsp_freq_policy = uhd::tune_request_t::POLICY_MANUAL;
+ tx_tune_req.dsp_freq = 0;
+ usrp->set_tx_freq(tx_tune_req);
+
+ //tune the receiver
+ usrp->set_rx_freq(usrp->get_tx_freq() - rx_offset);
+
+ //wait for the LOs to become locked
+ boost::system_time start = boost::get_system_time();
+ while (not usrp->get_tx_sensor("lo_locked").to_bool() or not usrp->get_rx_sensor("lo_locked").to_bool()){
+ if (boost::get_system_time() > start + boost::posix_time::milliseconds(100)){
+ throw std::runtime_error("timed out waiting for TX and/or RX LO to lock");
+ }
+ }
+}
+
+/***********************************************************************
+ * Data capture routine
+ **********************************************************************/
+static void capture_samples(uhd::usrp::multi_usrp::sptr usrp, uhd::rx_streamer::sptr rx_stream, std::vector<std::complex<float> > &buff){
+ uhd::stream_cmd_t stream_cmd(uhd::stream_cmd_t::STREAM_MODE_NUM_SAMPS_AND_DONE);
+ stream_cmd.num_samps = buff.size();
+ stream_cmd.stream_now = true;
+ usrp->issue_stream_cmd(stream_cmd);
+ uhd::rx_metadata_t md;
+ const size_t num_rx_samps = rx_stream->recv(&buff.front(), buff.size(), md);
+
+ //validate the received data
+ 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 (num_rx_samps != buff.size()){
+ throw std::runtime_error("did not get all the samples requested");
+ }
+}
+
+ struct result_t{
+ double freq, ampl, phase, sup;
+ };
+
+/***********************************************************************
* Main
**********************************************************************/
int UHD_SAFE_MAIN(int argc, char *argv[]){
std::string args;
- double rate;
+ double rate, tx_wave_freq, tx_wave_ampl, rx_offset;
+ size_t nsamps;
po::options_description desc("Allowed options");
desc.add_options()
("help", "help message")
("args", po::value<std::string>(&args)->default_value(""), "device address args [default = \"\"]")
("rate", po::value<double>(&rate)->default_value(12.5e6), "RX and TX sample rate in Hz")
+ ("tx_wave_freq", po::value<double>(&tx_wave_freq)->default_value(507.123e3), "Transmit wave frequency in Hz")
+ ("tx_wave_ampl", po::value<double>(&tx_wave_ampl)->default_value(0.7), "Transmit wave amplitude in counts")
+ ("rx_offset", po::value<double>(&rx_offset)->default_value(.9344e6), "RX LO offset from the TX LO in Hz")
+ ("nsamps", po::value<size_t>(&nsamps)->default_value(10000), "Samples per data capture")
;
po::variables_map vm;
@@ -163,31 +214,6 @@ int UHD_SAFE_MAIN(int argc, char *argv[]){
usrp->set_rx_rate(rate);
usrp->set_tx_rate(rate);
- //tune the transmitter with no cordic
- uhd::tune_request_t tx_tune_req(2.155e9);
- tx_tune_req.dsp_freq_policy = uhd::tune_request_t::POLICY_MANUAL;
- tx_tune_req.dsp_freq = 0;
- usrp->set_tx_freq(tx_tune_req);
- {
- boost::system_time start = boost::get_system_time();
- while (not usrp->get_tx_sensor("lo_locked").to_bool()){
- if (boost::get_system_time() > start + boost::posix_time::milliseconds(100)){
- throw std::runtime_error("timed out waiting for TX LO to lock");
- }
- }
- }
-
- //tune the receiver
- usrp->set_rx_freq(2.155e9 - .9344e6);
- {
- boost::system_time start = boost::get_system_time();
- while (not usrp->get_rx_sensor("lo_locked").to_bool()){
- if (boost::get_system_time() > start + boost::posix_time::milliseconds(100)){
- throw std::runtime_error("timed out waiting for RX LO to lock");
- }
- }
- }
-
//set max receiver gain
usrp->set_rx_gain(usrp->get_rx_gain_range().stop());
@@ -197,47 +223,110 @@ int UHD_SAFE_MAIN(int argc, char *argv[]){
//create a transmitter thread
boost::thread_group threads;
- threads.create_thread(boost::bind(&tx_thread, usrp));
+ threads.create_thread(boost::bind(&tx_thread, usrp, tx_wave_freq, tx_wave_ampl));
- //receive some samples
- std::vector<std::complex<float> > buff(100000);
- usrp->set_time_now(uhd::time_spec_t(0.0));
- uhd::stream_cmd_t stream_cmd(uhd::stream_cmd_t::STREAM_MODE_NUM_SAMPS_AND_DONE);
- stream_cmd.num_samps = buff.size();
- stream_cmd.stream_now = false;
- stream_cmd.time_spec = uhd::time_spec_t(0.1);
- usrp->issue_stream_cmd(stream_cmd);
- uhd::rx_metadata_t md;
- const size_t num_rx_samps = rx_stream->recv(&buff.front(), buff.size(), md);
+ //re-usable buffer for samples
+ std::vector<std::complex<float> > buff(nsamps);
+
+ const uhd::meta_range_t freq_range = usrp->get_tx_freq_range();
+ const double freq_step = 100e6;
+
+ std::vector<result_t> results;
+
+ for (double tx_lo = freq_range.start()+freq_step; tx_lo < freq_range.stop()-freq_step; tx_lo += freq_step){
+ //const double tx_lo = 2.155e9;{
+ //tune the LOs
+ tune_rx_and_tx(usrp, tx_lo, rx_offset);
+
+ double phase_corr_start = -.3;
+ double phase_corr_stop = .3;
+ double phase_corr_step;
+
+ double ampl_corr_start = -.3;
+ double ampl_corr_stop = .3;
+ double ampl_corr_step;
+
+ std::complex<double> best_correction;
+ double best_supression = 0;
+ double best_phase_corr = 0;
+ double best_ampl_corr = 0;
+
+ for (size_t i = 0; i < 7; i++){
+
+ phase_corr_step = (phase_corr_stop - phase_corr_start)/4;
+ ampl_corr_step = (ampl_corr_stop - ampl_corr_start)/4;
+
+ for (double phase_corr = phase_corr_start; phase_corr <= phase_corr_stop; phase_corr += phase_corr_step){
+ for (double ampl_corr = ampl_corr_start; ampl_corr <= ampl_corr_stop; ampl_corr += ampl_corr_step){
+
+ const std::complex<double> correction = std::polar(ampl_corr+1, phase_corr*tau);
+ usrp->set_tx_iq_balance(correction);
+
+ //receive some samples
+ capture_samples(usrp, rx_stream, buff);
+
+ 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 + tx_wave_freq - actual_rx_freq;
+ const double bb_imag_freq = actual_tx_freq - tx_wave_freq - actual_rx_freq;
+
+ const double tone_dbrms = compute_tone_dbrms(buff, bb_tone_freq/actual_rx_rate);
+ const double imag_dbrms = compute_tone_dbrms(buff, bb_imag_freq/actual_rx_rate);
+ const double supression = tone_dbrms - imag_dbrms;
+
+ //std::cout << "bb_tone_freq " << bb_tone_freq << std::endl;
+ //std::cout << "bb_imag_freq " << bb_imag_freq << std::endl;
+ //std::cout << "tone_dbrms " << tone_dbrms << std::endl;
+ //std::cout << "imag_dbrms " << imag_dbrms << std::endl;
+ //std::cout << "supression " << (tone_dbrms - imag_dbrms) << std::endl;
+
+ if (supression > best_supression){
+ best_correction = correction;
+ best_supression = supression;
+ best_phase_corr = phase_corr;
+ best_ampl_corr = ampl_corr;
+ //std::cout << " supression! " << supression << std::endl;
+ }
+
+ }}
+
+ //std::cout << "best_phase_corr " << best_phase_corr << std::endl;
+ //std::cout << "best_ampl_corr " << best_ampl_corr << std::endl;
+ //std::cout << "best_supression " << best_supression << std::endl;
+
+ phase_corr_start = best_phase_corr - phase_corr_step;
+ phase_corr_stop = best_phase_corr + phase_corr_step;
+ ampl_corr_start = best_ampl_corr - ampl_corr_step;
+ ampl_corr_stop = best_ampl_corr + ampl_corr_step;
+ }
+
+ if (best_supression > 30){ //most likely valid, keep result
+ result_t result;
+ result.freq = tx_lo;
+ result.ampl = best_ampl_corr;
+ result.phase = best_phase_corr;
+ result.sup = best_supression;
+ results.push_back(result);
+ }
+ std::cout << "." << std::flush;
- //validate the received data
- 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 (num_rx_samps != buff.size()){
- throw std::runtime_error("did not get all the samples requested");
}
+ std::cout << std::endl;
//stop the transmitter
threads.interrupt_all();
threads.join_all();
- 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 + tx_wave_freq - actual_rx_freq;
- const double bb_imag_freq = actual_tx_freq - tx_wave_freq - actual_rx_freq;
- const double tone_dbrms = compute_tone_dbrms(buff, bb_tone_freq/actual_rx_rate);
- const double imag_dbrms = compute_tone_dbrms(buff, bb_imag_freq/actual_rx_rate);
-
- std::cout << "bb_tone_freq " << bb_tone_freq << std::endl;
- std::cout << "bb_imag_freq " << bb_imag_freq << std::endl;
- std::cout << "tone_dbrms " << tone_dbrms << std::endl;
- std::cout << "imag_dbrms " << imag_dbrms << std::endl;
- std::cout << "supression " << (tone_dbrms - imag_dbrms) << std::endl;
+ for (size_t i = 0; i < results.size(); i++){
+ std::cout
+ << results[i].freq << ", "
+ << results[i].ampl << ", "
+ << results[i].phase << ", "
+ << results[i].sup << ", "
+ << std::endl;
+ }
return 0;
}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-19 10:46:36 +0000