diff options
Diffstat (limited to 'host/examples')
| -rw-r--r-- | host/examples/tx_waveforms.cpp | 19 |
1 files changed, 15 insertions, 4 deletions
diff --git a/host/examples/tx_waveforms.cpp b/host/examples/tx_waveforms.cpp index 9886000b1..3f319cf68 100644 --- a/host/examples/tx_waveforms.cpp +++ b/host/examples/tx_waveforms.cpp @@ -17,6 +17,7 @@ #include <uhd/utils/thread_priority.hpp> #include <uhd/utils/safe_main.hpp> +#include <uhd/utils/static.hpp> #include <uhd/usrp/simple_usrp.hpp> #include <boost/program_options.hpp> #include <boost/thread/thread_time.hpp> //system time @@ -44,9 +45,16 @@ float gen_ramp(float x){ return std::fmod(x, 1)*2 - 1; } +#define sine_table_len 2048 +static float sine_table[sine_table_len]; +UHD_STATIC_BLOCK(gen_sine_table){ + static const float m_pi = std::acos(float(-1)); + for (size_t i = 0; i < sine_table_len; i++) + sine_table[i] = std::sin((2*m_pi*i)/sine_table_len); +} + float gen_sine(float x){ - static const float two_pi = 2*std::acos(float(-1)); - return std::sin(x*two_pi); + return sine_table[size_t(x*sine_table_len)%sine_table_len]; } int UHD_SAFE_MAIN(int argc, char *argv[]){ @@ -65,11 +73,11 @@ int UHD_SAFE_MAIN(int argc, char *argv[]){ ("args", po::value<std::string>(&args)->default_value(""), "simple uhd device address args") ("duration", po::value<size_t>(&total_duration)->default_value(3), "number of seconds to transmit") ("spb", po::value<size_t>(&spb)->default_value(10000), "samples per buffer") - ("rate", po::value<double>(&rate)->default_value(100e6/16), "rate of outgoing samples") + ("rate", po::value<double>(&rate)->default_value(1.5e6), "rate of outgoing samples") ("freq", po::value<double>(&freq)->default_value(0), "rf center frequency in Hz") ("ampl", po::value<float>(&l)->default_value(float(0.3)), "amplitude of the waveform") ("gain", po::value<float>(&gain)->default_value(float(0)), "gain for the RF chain") - ("wave-type", po::value<std::string>(&wave_type)->default_value("SINE"), "waveform type (CONST, SQUARE, RAMP, SINE)") + ("wave-type", po::value<std::string>(&wave_type)->default_value("CONST"), "waveform type (CONST, SQUARE, RAMP, SINE)") ("wave-freq", po::value<double>(&wave_freq)->default_value(0), "waveform frequency in Hz") ; po::variables_map vm; @@ -113,6 +121,9 @@ int UHD_SAFE_MAIN(int argc, char *argv[]){ if (std::abs(wave_freq) > sdev->get_tx_rate()/2){ throw std::runtime_error("wave freq out of Nyquist zone"); } + if (sdev->get_tx_rate()/std::abs(wave_freq) > sine_table_len/2 and wave_type == "SINE"){ + throw std::runtime_error("sine freq too small for table"); + } //store the generator function for the selected waveform boost::function<float(float)> wave_gen; |