diff options
Diffstat (limited to 'host/lib')
| -rw-r--r-- | host/lib/usrp/usrp2/usrp2_impl.cpp | 10 |
1 files changed, 5 insertions, 5 deletions
diff --git a/host/lib/usrp/usrp2/usrp2_impl.cpp b/host/lib/usrp/usrp2/usrp2_impl.cpp index d780a6c6b..59fd9849c 100644 --- a/host/lib/usrp/usrp2/usrp2_impl.cpp +++ b/host/lib/usrp/usrp2/usrp2_impl.cpp @@ -20,6 +20,7 @@ #include <boost/format.hpp> #include <boost/math/special_functions.hpp> #include <functional> +#include <cmath> using namespace uhd; using namespace uhd::usrp; @@ -916,22 +917,21 @@ double usrp2_impl::set_tx_dsp_freq(const std::string& mb, const double freq_) const double tick_rate = _tree->access<double>("/mboards/" + mb + "/tick_rate").get(); // calculate the DAC shift (multiples of rate) - const int sign = boost::math::sign(new_freq); - const int zone = std::min(boost::math::iround(new_freq / tick_rate), 2); - const double dac_shift = sign * zone * tick_rate; + const int zone = std::max(std::min(std::lround(new_freq / tick_rate), 2), -2); + const double dac_shift = zone * tick_rate; new_freq -= dac_shift; // update FPGA DSP target freq UHD_LOG_TRACE("USRP2", "DSP Tuning: Requested " + std::to_string(freq_ / 1e6) + " MHz, Using " "Nyquist zone " - + std::to_string(sign * zone) + + std::to_string(zone) + ", leftover DSP tuning: " + std::to_string(new_freq / 1e6) + " MHz."); // set the DAC shift (modulation mode) if (zone == 0) { _mbc[mb].codec->set_tx_mod_mode(0); // no shift } else { - _mbc[mb].codec->set_tx_mod_mode(sign * 4 / zone); // DAC interp = 4 + _mbc[mb].codec->set_tx_mod_mode(4 / zone); // DAC interp = 4 } return _mbc[mb].tx_dsp->set_freq(new_freq) + dac_shift; // actual freq |