Revision 02e339cc

b/host/examples/tx_waveforms.cpp
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#include <uhd/utils/thread_priority.hpp>


  		





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#include <uhd/utils/safe_main.hpp>


  		





  
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#include <uhd/utils/static.hpp>


  		





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#include <uhd/usrp/simple_usrp.hpp>


  		





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#include <boost/program_options.hpp>


  		





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#include <boost/thread/thread_time.hpp> //system time


  		





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    return std::fmod(x, 1)*2 - 1;


  		





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}


  		





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#define sine_table_len 2048


  		





  
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static float sine_table[sine_table_len];


  		





  
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UHD_STATIC_BLOCK(gen_sine_table){


  		





  
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    static const float m_pi = std::acos(float(-1));


  		





  
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    for (size_t i = 0; i < sine_table_len; i++)


  		





  
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        sine_table[i] = std::sin((2*m_pi*i)/sine_table_len);


  		





  
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}


  		





  
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float gen_sine(float x){


  		





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    static const float two_pi = 2*std::acos(float(-1));


  		





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    return std::sin(x*two_pi);


  		





  
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    return sine_table[size_t(x*sine_table_len)%sine_table_len];


  		





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}


  		





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int UHD_SAFE_MAIN(int argc, char *argv[]){


  		





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        ("args", po::value<std::string>(&args)->default_value(""), "simple uhd device address args")


  		





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        ("duration", po::value<size_t>(&total_duration)->default_value(3), "number of seconds to transmit")


  		





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        ("spb", po::value<size_t>(&spb)->default_value(10000), "samples per buffer")


  		





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        ("rate", po::value<double>(&rate)->default_value(100e6/16), "rate of outgoing samples")


  		





  
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        ("rate", po::value<double>(&rate)->default_value(1.5e6), "rate of outgoing samples")


  		





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        ("freq", po::value<double>(&freq)->default_value(0), "rf center frequency in Hz")


  		





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        ("ampl", po::value<float>(&ampl)->default_value(float(0.3)), "amplitude of the waveform")


  		





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        ("gain", po::value<float>(&gain)->default_value(float(0)), "gain for the RF chain")


  		





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        ("wave-type", po::value<std::string>(&wave_type)->default_value("SINE"), "waveform type (CONST, SQUARE, RAMP, SINE)")


  		





  
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        ("wave-type", po::value<std::string>(&wave_type)->default_value("CONST"), "waveform type (CONST, SQUARE, RAMP, SINE)")


  		





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        ("wave-freq", po::value<double>(&wave_freq)->default_value(0), "waveform frequency in Hz")


  		





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    ;


  		





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    po::variables_map vm;


  		





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    if (std::abs(wave_freq) > sdev->get_tx_rate()/2){


  		





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        throw std::runtime_error("wave freq out of Nyquist zone");


  		





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    }


  		





  
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    if (sdev->get_tx_rate()/std::abs(wave_freq) > sine_table_len/2 and wave_type == "SINE"){


  		





  
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        throw std::runtime_error("sine freq too small for table");


  		





  
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    }


  		





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    //store the generator function for the selected waveform


  		





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    boost::function<float(float)> wave_gen;


  		












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