aboutsummaryrefslogtreecommitdiffstats
path: root/host/lib/usrp/common/adf435x_common.cpp
diff options
context:
space:
mode:
Diffstat (limited to 'host/lib/usrp/common/adf435x_common.cpp')
-rw-r--r--host/lib/usrp/common/adf435x_common.cpp161
1 files changed, 0 insertions, 161 deletions
diff --git a/host/lib/usrp/common/adf435x_common.cpp b/host/lib/usrp/common/adf435x_common.cpp
deleted file mode 100644
index 474a1c932..000000000
--- a/host/lib/usrp/common/adf435x_common.cpp
+++ /dev/null
@@ -1,161 +0,0 @@
-//
-// Copyright 2013-2014 Ettus Research LLC
-//
-// This program is free software: you can redistribute it and/or modify
-// it under the terms of the GNU General Public License as published by
-// the Free Software Foundation, either version 3 of the License, or
-// (at your option) any later version.
-//
-// This program is distributed in the hope that it will be useful,
-// but WITHOUT ANY WARRANTY; without even the implied warranty of
-// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-// GNU General Public License for more details.
-//
-// You should have received a copy of the GNU General Public License
-// along with this program. If not, see <http://www.gnu.org/licenses/>.
-//
-
-#include "adf435x_common.hpp"
-
-#include <boost/math/special_functions/round.hpp>
-#include <uhd/types/tune_request.hpp>
-#include <uhd/utils/log.hpp>
-#include <cmath>
-
-
-using namespace uhd;
-
-/***********************************************************************
- * ADF 4350/4351 Tuning Utility
- **********************************************************************/
-adf435x_tuning_settings tune_adf435x_synth(
- const double target_freq,
- const double ref_freq,
- const adf435x_tuning_constraints& constraints,
- double& actual_freq)
-{
- //Default invalid value for actual_freq
- actual_freq = 0;
-
- double pfd_freq = 0;
- boost::uint16_t R = 0, BS = 0, N = 0, FRAC = 0, MOD = 0;
- boost::uint16_t RFdiv = static_cast<boost::uint16_t>(constraints.rf_divider_range.start());
- bool D = false, T = false;
-
- //Reference doubler for 50% duty cycle
- //If ref_freq < 12.5MHz enable the reference doubler
- D = (ref_freq <= constraints.ref_doubler_threshold);
-
- static const double MIN_VCO_FREQ = 2.2e9;
- static const double MAX_VCO_FREQ = 4.4e9;
-
- //increase RF divider until acceptable VCO frequency
- double vco_freq = target_freq;
- while (vco_freq < MIN_VCO_FREQ && RFdiv < static_cast<boost::uint16_t>(constraints.rf_divider_range.stop())) {
- vco_freq *= 2;
- RFdiv *= 2;
- }
-
- /*
- * The goal here is to loop though possible R dividers,
- * band select clock dividers, N (int) dividers, and FRAC
- * (frac) dividers.
- *
- * Calculate the N and F dividers for each set of values.
- * The loop exits when it meets all of the constraints.
- * The resulting loop values are loaded into the registers.
- *
- * from pg.21
- *
- * f_pfd = f_ref*(1+D)/(R*(1+T))
- * f_vco = (N + (FRAC/MOD))*f_pfd
- * N = f_vco/f_pfd - FRAC/MOD = f_vco*((R*(T+1))/(f_ref*(1+D))) - FRAC/MOD
- * f_actual = f_vco/RFdiv)
- */
- double feedback_freq = constraints.feedback_after_divider ? target_freq : vco_freq;
-
- for(R = 1; R <= 1023; R+=1){
- //PFD input frequency = f_ref/R ... ignoring Reference doubler/divide-by-2 (D & T)
- pfd_freq = ref_freq*(D?2:1)/(R*(T?2:1));
-
- //keep the PFD frequency at or below 25MHz (Loop Filter Bandwidth)
- if (pfd_freq > constraints.pfd_freq_max) continue;
-
- //First, ignore fractional part of tuning
- N = boost::uint16_t(std::floor(feedback_freq/pfd_freq));
-
- //keep N > minimum int divider requirement
- if (N < static_cast<boost::uint16_t>(constraints.int_range.start())) continue;
-
- for(BS=1; BS <= 255; BS+=1){
- //keep the band select frequency at or below band_sel_freq_max
- //constraint on band select clock
- if (pfd_freq/BS > constraints.band_sel_freq_max) continue;
- goto done_loop;
- }
- } done_loop:
-
- //Fractional-N calculation
- MOD = 4095; //max fractional accuracy
- FRAC = static_cast<boost::uint16_t>(boost::math::round((feedback_freq/pfd_freq - N)*MOD));
- if (constraints.force_frac0) {
- if (FRAC > (MOD / 2)) { //Round integer such that actual freq is closest to target
- N++;
- }
- FRAC = 0;
- }
-
- //Reference divide-by-2 for 50% duty cycle
- // if R even, move one divide by 2 to to regs.reference_divide_by_2
- if(R % 2 == 0) {
- T = true;
- R /= 2;
- }
-
- //Typical phase resync time documented in data sheet pg.24
- static const double PHASE_RESYNC_TIME = 400e-6;
-
- //If feedback after divider, then compensation for the divider is pulled into the INT value
- int rf_div_compensation = constraints.feedback_after_divider ? 1 : RFdiv;
-
- //Compute the actual frequency in terms of ref_freq, N, FRAC, MOD, D, R and T.
- actual_freq = (
- double((N + (double(FRAC)/double(MOD))) *
- (ref_freq*(D?2:1)/(R*(T?2:1))))
- ) / rf_div_compensation;
-
- //load the settings
- adf435x_tuning_settings settings;
- settings.frac_12_bit = FRAC;
- settings.int_16_bit = N;
- settings.mod_12_bit = MOD;
- settings.clock_divider_12_bit = std::max<boost::uint16_t>(1, boost::uint16_t(std::ceil(PHASE_RESYNC_TIME*pfd_freq/MOD)));
- settings.r_counter_10_bit = R;
- settings.r_divide_by_2_en = T;
- settings.r_doubler_en = D;
- settings.band_select_clock_div = boost::uint8_t(BS);
- settings.rf_divider = RFdiv;
-
- std::string tuning_str = (constraints.force_frac0) ? "Integer-N" : "Fractional";
- UHD_LOGV(often)
- << boost::format("ADF 435X Frequencies (MHz): REQUESTED=%0.9f, ACTUAL=%0.9f"
- ) % (target_freq/1e6) % (actual_freq/1e6) << std::endl
- << boost::format("ADF 435X Intermediates (MHz): Feedback=%0.2f, VCO=%0.2f, PFD=%0.2f, BAND=%0.2f, REF=%0.2f"
- ) % (feedback_freq/1e6) % (vco_freq/1e6) % (pfd_freq/1e6) % (pfd_freq/BS/1e6) % (ref_freq/1e6) << std::endl
- << boost::format("ADF 435X Tuning: %s") % tuning_str.c_str() << std::endl
- << boost::format("ADF 435X Settings: R=%d, BS=%d, N=%d, FRAC=%d, MOD=%d, T=%d, D=%d, RFdiv=%d"
- ) % R % BS % N % FRAC % MOD % T % D % RFdiv << std::endl;
-
- UHD_ASSERT_THROW((settings.frac_12_bit & ((boost::uint16_t)~0xFFF)) == 0);
- UHD_ASSERT_THROW((settings.mod_12_bit & ((boost::uint16_t)~0xFFF)) == 0);
- UHD_ASSERT_THROW((settings.clock_divider_12_bit & ((boost::uint16_t)~0xFFF)) == 0);
- UHD_ASSERT_THROW((settings.r_counter_10_bit & ((boost::uint16_t)~0x3FF)) == 0);
-
- UHD_ASSERT_THROW(vco_freq >= MIN_VCO_FREQ and vco_freq <= MAX_VCO_FREQ);
- UHD_ASSERT_THROW(settings.rf_divider >= static_cast<boost::uint16_t>(constraints.rf_divider_range.start()));
- UHD_ASSERT_THROW(settings.rf_divider <= static_cast<boost::uint16_t>(constraints.rf_divider_range.stop()));
- UHD_ASSERT_THROW(settings.int_16_bit >= static_cast<boost::uint16_t>(constraints.int_range.start()));
- UHD_ASSERT_THROW(settings.int_16_bit <= static_cast<boost::uint16_t>(constraints.int_range.stop()));
-
- return settings;
-}
generated by cgit v1.2.3 (git 2.39.1) at 2025-01-04 00:20:59 +0000