diff options
Diffstat (limited to 'host/lib/usrp')
| -rw-r--r-- | host/lib/usrp/dboard/db_sbx_version3.cpp | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/host/lib/usrp/dboard/db_sbx_version3.cpp b/host/lib/usrp/dboard/db_sbx_version3.cpp index 14045789f..bf5da0a6d 100644 --- a/host/lib/usrp/dboard/db_sbx_version3.cpp +++ b/host/lib/usrp/dboard/db_sbx_version3.cpp @@ -110,7 +110,7 @@ double sbx_xcvr::sbx_version3::set_lo_freq(dboard_iface::unit_t unit, double tar if (pfd_freq > 25e6) continue; //ignore fractional part of tuning - N = int(std::floor(vco_freq/pfd_freq)); + N = int(std::floor(target_freq/pfd_freq)); //keep N > minimum int divider requirement if (N < prescaler_to_min_int_div[prescaler]) continue; @@ -125,7 +125,7 @@ double sbx_xcvr::sbx_version3::set_lo_freq(dboard_iface::unit_t unit, double tar //Fractional-N calculation MOD = 4095; //max fractional accuracy - FRAC = int((vco_freq/pfd_freq - N)*MOD); + FRAC = int((target_freq/pfd_freq - N)*MOD); //Reference divide-by-2 for 50% duty cycle // if R even, move one divide by 2 to to regs.reference_divide_by_2 @@ -135,7 +135,7 @@ double sbx_xcvr::sbx_version3::set_lo_freq(dboard_iface::unit_t unit, double tar } //actual frequency calculation - actual_freq = double((N + (double(FRAC)/double(MOD)))*ref_freq*(1+int(D))/(R*(1+int(T)))/RFdiv); + actual_freq = double((N + (double(FRAC)/double(MOD)))*ref_freq*(1+int(D))/(R*(1+int(T)))); UHD_LOGV(often) << boost::format("SBX Intermediates: ref=%0.2f, outdiv=%f, fbdiv=%f") % (ref_freq*(1+int(D))/(R*(1+int(T)))) % double(RFdiv*2) % double(N + double(FRAC)/double(MOD)) << std::endl @@ -155,6 +155,9 @@ double sbx_xcvr::sbx_version3::set_lo_freq(dboard_iface::unit_t unit, double tar regs.frac_12_bit = FRAC; regs.int_16_bit = N; regs.mod_12_bit = MOD; + regs.clock_divider_12_bit = boost::math::iround(1/pfd_freq * MOD / 2e-3 * 4); + regs.feedback_select = adf4350_regs_t::FEEDBACK_SELECT_DIVIDED; + regs.clock_div_mode = adf4350_regs_t::CLOCK_DIV_MODE_RESYNC_ENABLE; regs.prescaler = prescaler; regs.r_counter_10_bit = R; regs.reference_divide_by_2 = T; |