diff options
Diffstat (limited to 'host/lib/usrp/dboard/db_rfx.cpp')
| -rw-r--r-- | host/lib/usrp/dboard/db_rfx.cpp | 44 |
1 files changed, 26 insertions, 18 deletions
diff --git a/host/lib/usrp/dboard/db_rfx.cpp b/host/lib/usrp/dboard/db_rfx.cpp index 4d8222a52..f938c749a 100644 --- a/host/lib/usrp/dboard/db_rfx.cpp +++ b/host/lib/usrp/dboard/db_rfx.cpp @@ -294,6 +294,9 @@ double rfx_xcvr::set_lo_freq( target_freq = _freq_range.clip(target_freq); if (_div2[unit]) target_freq *= 2; + //rfx400 rx is a special case with div2 in mixer, so adf4360 must output fundamental + bool is_rx_rfx400 = ((get_rx_id() == 0x0024) && unit != dboard_iface::UNIT_TX); + //map prescalers to the register enums static const uhd::dict<int, adf4360_regs_t::prescaler_value_t> prescaler_to_enum = map_list_of (8, adf4360_regs_t::PRESCALER_VALUE_8_9) @@ -309,7 +312,8 @@ double rfx_xcvr::set_lo_freq( (8, adf4360_regs_t::BAND_SELECT_CLOCK_DIV_8) ; - double actual_freq=0, ref_freq = this->get_iface()->get_clock_rate(unit); + std::vector<double> clock_rates = this->get_iface()->get_clock_rates(unit); + double actual_freq = 0, ref_freq = 0; int R=0, BS=0, P=0, B=0, A=0; /* @@ -322,27 +326,31 @@ double rfx_xcvr::set_lo_freq( * fvco = [P*B + A] * fref/R * fvco*R/fref = P*B + A = N */ - for(R = 2; R <= 32; R+=2){ - BOOST_FOREACH(BS, bandsel_to_enum.keys()){ - if (ref_freq/R/BS > 1e6) continue; //constraint on band select clock - BOOST_FOREACH(P, prescaler_to_enum.keys()){ - //calculate B and A from N - double N = target_freq*R/ref_freq; - B = int(std::floor(N/P)); - A = boost::math::iround(N - P*B); - if (B < A or B > 8191 or B < 3 or A > 31) continue; //constraints on A, B - //calculate the actual frequency - actual_freq = double(P*B + A)*ref_freq/R; - if (actual_freq/P > 300e6) continue; //constraint on prescaler output - //constraints met: exit loop - goto done_loop; + for(R = 1; R <= 32; R+=((R==1)?1:2)){ + BOOST_FOREACH(ref_freq, uhd::reversed(uhd::sorted(clock_rates))){ + BOOST_FOREACH(BS, bandsel_to_enum.keys()){ + if (ref_freq/R/BS > 1e6) continue; //constraint on band select clock + BOOST_FOREACH(P, prescaler_to_enum.keys()){ + //calculate B and A from N + double N = target_freq*R/ref_freq; + B = int(std::floor(N/P)); + A = boost::math::iround(N - P*B); + if (B < A or B > 8191 or B < 3 or A > 31) continue; //constraints on A, B + //calculate the actual frequency + actual_freq = double(P*B + A)*ref_freq/R; + if (actual_freq/P > 300e6) continue; //constraint on prescaler output + //constraints met: exit loop + goto done_loop; + } } } } done_loop: if (rfx_debug) std::cerr << boost::format( - "RFX tune: R=%d, BS=%d, P=%d, B=%d, A=%d" - ) % R % BS % P % B % A << std::endl; + "RFX tune: R=%d, BS=%d, P=%d, B=%d, A=%d, DIV2=%d, ref=%fMHz" + ) % R % BS % P % B % A % int(_div2[unit] && (!is_rx_rfx400)) % (ref_freq/1e6) << std::endl; + + this->get_iface()->set_clock_rate(unit, ref_freq); //load the register values adf4360_regs_t regs; @@ -361,7 +369,7 @@ double rfx_xcvr::set_lo_freq( regs.a_counter = A; regs.b_counter = B; regs.cp_gain_1 = adf4360_regs_t::CP_GAIN_1_SET1; - regs.divide_by_2_output = (_div2[unit] && (get_rx_id() != 0x0024)) ? // Special case RFX400 RX Mixer divides by two + regs.divide_by_2_output = (_div2[unit] && (!is_rx_rfx400)) ? // Special case RFX400 RX Mixer divides by two adf4360_regs_t::DIVIDE_BY_2_OUTPUT_DIV2 : adf4360_regs_t::DIVIDE_BY_2_OUTPUT_FUND ; regs.divide_by_2_prescaler = adf4360_regs_t::DIVIDE_BY_2_PRESCALER_FUND; |