Merge branch 'tvrx_uhd'

9 files changed, 590 insertions, 0 deletions

diff --git a/host/lib/ic_reg_maps/CMakeLists.txt b/host/lib/ic_reg_maps/CMakeLists.txt
index f8e15c13d..25f34a280 100644
--- a/host/lib/ic_reg_maps/CMakeLists.txt
+++ b/host/lib/ic_reg_maps/CMakeLists.txt
@@ -68,3 +68,8 @@ LIBUHD_PYTHON_GEN_SOURCE(
     ${CMAKE_SOURCE_DIR}/lib/ic_reg_maps/gen_ad9522_regs.py
     ${CMAKE_BINARY_DIR}/lib/ic_reg_maps/ad9522_regs.hpp
 )
+
+LIBUHD_PYTHON_GEN_SOURCE(
+    ${CMAKE_SOURCE_DIR}/lib/ic_reg_maps/gen_tuner_4937di5_regs.py
+    ${CMAKE_BINARY_DIR}/lib/ic_reg_maps/tuner_4937di5_regs.hpp
+)
diff --git a/host/lib/ic_reg_maps/gen_max2118_regs.py b/host/lib/ic_reg_maps/gen_max2118_regs.py
index 506fbaec8..506fbaec8 100644..100755
--- a/host/lib/ic_reg_maps/gen_max2118_regs.py
+++ b/host/lib/ic_reg_maps/gen_max2118_regs.py
diff --git a/host/lib/ic_reg_maps/gen_tuner_4937di5_regs.py b/host/lib/ic_reg_maps/gen_tuner_4937di5_regs.py
new file mode 100644
index 000000000..73f7aa3db
--- /dev/null
+++ b/host/lib/ic_reg_maps/gen_tuner_4937di5_regs.py
@@ -0,0 +1,75 @@
+#!/usr/bin/env python
+#
+# Copyright 2010 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/>.
+#
+
+########################################################################
+# Template for raw text data describing registers
+# name addr[bit range inclusive] default optional enums
+########################################################################
+REGS_TMPL="""\
+########################################################################
+## Note: offsets given from perspective of data bits (excludes address)
+########################################################################
+## Divider byte 1
+########################################################################
+db1                   0[0:6]        0x00
+########################################################################
+## Divider byte 2
+########################################################################
+db2                   1[0:7]        0x00
+########################################################################
+## Control byte 1
+########################################################################
+cb7                   2[7]          0x01
+cp                    2[6]          0x00     low,high
+os                    2[0]          0x00     on,off
+rs                    2[1:2]        0x00     d512=3,d640=0,d1024=1
+test                  2[3:5]        0x01     normal=0x01,cpoff=0x02,cpsink=0x06,cpsrc=0x07,cptest1=0x04,cptest2=0x05
+########################################################################
+## Control byte 2
+########################################################################
+bandsel               3[4:7]        0x03     uhf=0x03,vhfhi=0x09,vhflo=0x0a
+power                 3[3]          0x00     on,off
+"""
+
+########################################################################
+# Template for methods in the body of the struct
+########################################################################
+BODY_TMPL="""\
+boost::uint8_t get_reg(boost::uint8_t addr){
+    boost::uint8_t reg = 0;
+    switch(addr){
+    #for $addr in sorted(set(map(lambda r: r.get_addr(), $regs)))
+    case $addr:
+        #for $reg in filter(lambda r: r.get_addr() == addr, $regs)
+        reg |= (boost::uint8_t($reg.get_name()) & $reg.get_mask()) << $reg.get_shift();
+        #end for
+        break;
+    #end for
+    }
+    return boost::uint8_t(reg);
+}
+
+"""
+
+if __name__ == '__main__':
+    import common; common.generate(
+        name='tuner_4937di5_regs',
+        regs_tmpl=REGS_TMPL,
+        body_tmpl=BODY_TMPL,
+        file=__file__,
+    )
diff --git a/host/lib/usrp/dboard/CMakeLists.txt b/host/lib/usrp/dboard/CMakeLists.txt
index 3e995009e..8d3d11530 100644
--- a/host/lib/usrp/dboard/CMakeLists.txt
+++ b/host/lib/usrp/dboard/CMakeLists.txt
@@ -24,5 +24,6 @@ LIBUHD_APPEND_SOURCES(
     ${CMAKE_SOURCE_DIR}/lib/usrp/dboard/db_wbx.cpp
     ${CMAKE_SOURCE_DIR}/lib/usrp/dboard/db_dbsrx.cpp
     ${CMAKE_SOURCE_DIR}/lib/usrp/dboard/db_unknown.cpp
+    ${CMAKE_SOURCE_DIR}/lib/usrp/dboard/db_tvrx.cpp
 )
 
diff --git a/host/lib/usrp/dboard/db_tvrx.cpp b/host/lib/usrp/dboard/db_tvrx.cpp
new file mode 100644
index 000000000..1cb74c5ae
--- /dev/null
+++ b/host/lib/usrp/dboard/db_tvrx.cpp
@@ -0,0 +1,477 @@
+//
+// Copyright 2010 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/>.
+//
+
+// No RX IO Pins Used
+
+// RX IO Functions
+
+//ADC/DAC functions:
+//DAC 1: RF AGC
+//DAC 2: IF AGC
+
+//min freq: 50e6
+//max freq: 860e6
+//gain range: [0:1dB:115dB]
+
+#include <uhd/utils/static.hpp>
+#include <uhd/utils/assert.hpp>
+#include <uhd/utils/algorithm.hpp>
+#include <uhd/utils/warning.hpp>
+#include <uhd/types/ranges.hpp>
+#include <uhd/types/dict.hpp>
+#include <uhd/usrp/subdev_props.hpp>
+#include <uhd/usrp/dboard_base.hpp>
+#include <uhd/usrp/dboard_manager.hpp>
+#include <boost/assign/list_of.hpp>
+#include <boost/format.hpp>
+#include <boost/thread.hpp>
+#include <boost/array.hpp>
+#include <boost/math/special_functions/round.hpp>
+#include <utility>
+#include <cmath>
+#include <cfloat>
+#include <limits>
+#include <tuner_4937di5_regs.hpp>
+
+using namespace uhd;
+using namespace uhd::usrp;
+using namespace boost::assign;
+
+/***********************************************************************
+ * The tvrx constants
+ **********************************************************************/
+static const bool tvrx_debug = false;
+
+static const freq_range_t tvrx_freq_range(50e6, 860e6);
+
+static const std::string tvrx_antennas = std::string(""); //only got one
+
+static const uhd::dict<std::string, freq_range_t> tvrx_freq_ranges = map_list_of
+    ("VHFLO", freq_range_t(50e6, 158e6))
+    ("VHFHI", freq_range_t(158e6, 454e6))
+    ("UHF"  , freq_range_t(454e6, 860e6))
+;
+
+static const boost::array<float, 17> vhflo_gains_db = 
+    {{-6.00000, -6.00000, -6.00000, -4.00000, 0.00000,
+     5.00000, 10.00000, 17.40000, 26.30000, 36.00000,
+     43.00000, 48.00000, 49.50000, 50.10000, 50.30000,
+     50.30000, 50.30000}};
+                                 
+static const boost::array<float, 17> vhfhi_gains_db = 
+    {{13.3000,  -13.3000,  -13.3000,   -1.0000,    7.7000,
+    11.0000,   14.7000,   19.3000,   26.1000,   36.0000,
+    42.7000,   46.0000,   47.0000,   47.8000,   48.2000,
+    48.2000,   48.2000}};
+    
+static const boost::array<float, 17> uhf_gains_db =
+    {{-8.0000,   -8.0000,   -7.0000,    4.0000,   10.2000,
+     14.5000,   17.5000,   20.0000,   24.5000,   30.8000,
+     37.0000,   39.8000,   40.7000,   41.6000,   42.6000,
+     43.2000,   43.8000}};
+     
+static const boost::array<float, 17> tvrx_if_gains_db = 
+    {{-1.50000,   -1.50000,   -1.50000,   -1.00000,    0.20000,
+     2.10000,    4.30000,    6.40000,    9.00000,   12.00000,
+     14.80000,   18.20000,   26.10000,   32.50000,  32.50000,
+     32.50000,   32.50000}};
+
+//gain linearization data
+//this is from the datasheet and is dB vs. volts (below)
+//i tried to curve fit this, but it's really just so nonlinear that you'd
+//need dang near as many coefficients as to just map it like this and interp.
+//these numbers are culled from the 4937DI5 datasheet and are probably totally inaccurate
+//but if it's better than the old linear fit i'm happy
+static const uhd::dict<std::string, boost::array<float, 17> > tvrx_rf_gains_db = map_list_of
+    ("VHFLO", vhflo_gains_db)
+    ("VHFHI", vhfhi_gains_db)
+    ("UHF"  , uhf_gains_db)
+;
+
+//sample voltages for the above points
+static const boost::array<float, 17> tvrx_gains_volts = 
+    {{0.8, 1.0, 1.2, 1.4, 1.6, 1.8, 2.0, 2.2, 2.4, 2.6, 2.8, 3.0, 3.2, 3.4, 3.6, 3.8, 4.0}};
+
+static uhd::dict<std::string, gain_range_t> get_tvrx_gain_ranges(void) {
+    float rfmax = 0.0, rfmin = FLT_MAX;
+    BOOST_FOREACH(const std::string range, tvrx_rf_gains_db.keys()) {
+        float my_max = tvrx_rf_gains_db[range].back(); //we're assuming it's monotonic
+        float my_min = tvrx_rf_gains_db[range].front(); //if it's not this is wrong wrong wrong
+        if(my_max > rfmax) rfmax = my_max;
+        if(my_min < rfmin) rfmin = my_min;
+    }
+    
+    float ifmin = tvrx_if_gains_db.front();
+    float ifmax = tvrx_if_gains_db.back();
+    
+    return map_list_of
+        ("RF", gain_range_t(rfmin, rfmax, (rfmax-rfmin)/4096.0))
+        ("IF", gain_range_t(ifmin, ifmax, (ifmax-ifmin)/4096.0))
+        ;
+}
+
+static const double opamp_gain = 1.22; //onboard DAC opamp gain
+static const double tvrx_if_freq = 43.75e6; //IF freq of TVRX module
+static const boost::uint16_t reference_divider = 640; //clock reference divider to use
+static const double reference_freq = 4.0e6;
+
+/***********************************************************************
+ * The tvrx dboard class
+ **********************************************************************/
+class tvrx : public rx_dboard_base{
+public:
+    tvrx(ctor_args_t args);
+    ~tvrx(void);
+    
+    void rx_get(const wax::obj &key, wax::obj &val);
+    void rx_set(const wax::obj &key, const wax::obj &val);
+
+private:
+    uhd::dict<std::string, float> _gains;
+    double _lo_freq;
+    tuner_4937di5_regs_t _tuner_4937di5_regs;
+    boost::uint8_t _tuner_4937di5_addr(void){
+        return (this->get_iface()->get_special_props().mangle_i2c_addrs)? 0x61 : 0x60; //ok really? we could rename that call
+    };
+
+    void set_gain(float gain, const std::string &name);
+    void set_freq(double freq);
+
+    void update_regs(void){
+        byte_vector_t regs_vector(4);
+
+        //get the register data
+        for(int i=0; i<4; i++){
+            regs_vector[i] = _tuner_4937di5_regs.get_reg(i);
+            if(tvrx_debug) std::cerr << boost::format(
+                "tvrx: send reg 0x%02x, value 0x%04x"
+            ) % int(i) % int(regs_vector[i]) << std::endl;
+        }
+
+        //send the data
+        this->get_iface()->write_i2c(
+            _tuner_4937di5_addr(), regs_vector
+        );
+    }
+
+};
+
+/***********************************************************************
+ * Register the tvrx dboard
+ **********************************************************************/
+static dboard_base::sptr make_tvrx(dboard_base::ctor_args_t args){
+    return dboard_base::sptr(new tvrx(args));
+}
+
+UHD_STATIC_BLOCK(reg_tvrx_dboard){
+    //register the factory function for the rx dbid
+    dboard_manager::register_dboard(0x0040, &make_tvrx, "tvrx");
+}
+
+/***********************************************************************
+ * Structors
+ **********************************************************************/
+tvrx::tvrx(ctor_args_t args) : rx_dboard_base(args){
+    this->get_iface()->set_clock_enabled(dboard_iface::UNIT_RX, true);
+
+    //set the gpio directions and atr controls (identically)
+    this->get_iface()->set_pin_ctrl(dboard_iface::UNIT_RX, 0x0); // All unused in atr
+    if (this->get_iface()->get_special_props().soft_clock_divider){
+        this->get_iface()->set_gpio_ddr(dboard_iface::UNIT_RX, 0x1); // GPIO0 is clock
+    }
+    else{
+        this->get_iface()->set_gpio_ddr(dboard_iface::UNIT_RX, 0x0); // All Inputs
+    }
+
+    //send initial register settings if necessary
+    
+    //set default freq
+    _lo_freq = tvrx_freq_range.min + tvrx_if_freq; //init _lo_freq to a sane default
+    set_freq(tvrx_freq_range.min);
+    
+    //set default gains
+    BOOST_FOREACH(const std::string &name, get_tvrx_gain_ranges().keys()){
+        set_gain(get_tvrx_gain_ranges()[name].min, name);
+    }
+}
+
+tvrx::~tvrx(void){
+}
+
+/*! Return a string corresponding to the relevant band
+ * \param freq the frequency of interest
+ * \return a string corresponding to the band
+ */
+
+static std::string get_band(double freq) {
+    BOOST_FOREACH(const std::string &band, tvrx_freq_ranges.keys()) {
+        if(freq >= tvrx_freq_ranges[band].min && freq <= tvrx_freq_ranges[band].max){
+            if(tvrx_debug) std::cout << "Band: " << band << std::endl;
+            return band;
+        }
+    }
+    UHD_THROW_INVALID_CODE_PATH();
+}
+
+/***********************************************************************
+ * Gain Handling
+ **********************************************************************/
+/*!
+ * Execute a linear interpolation to find the voltage corresponding to a desired gain
+ * \param gain the desired gain in dB
+ * \param db_vector the vector of dB readings
+ * \param volts_vector the corresponding vector of voltages db_vector was sampled at
+ * \return a voltage to feed the TVRX analog gain
+ */
+
+static float gain_interp(float gain, boost::array<float, 17> db_vector, boost::array<float, 17> volts_vector) {
+    float volts;
+    gain = std::clip<float>(gain, db_vector.front(), db_vector.back()); //let's not get carried away here
+    
+    boost::uint8_t gain_step = 0;
+    //find which bin we're in
+    for(size_t i = 0; i < db_vector.size()-1; i++) {
+        if(gain >= db_vector[i] && gain <= db_vector[i+1]) gain_step = i;
+    }
+    
+    //find the current slope for linear interpolation
+    float slope = (volts_vector[gain_step + 1] - volts_vector[gain_step]) 
+                / (db_vector[gain_step + 1] - db_vector[gain_step]);
+                
+    //the problem here is that for gains approaching the maximum, the voltage slope becomes infinite
+    //i.e., a small change in gain requires an infinite change in voltage
+    //to cope, we limit the slope
+    
+    if(slope == std::numeric_limits<float>::infinity())
+        return volts_vector[gain_step];
+
+    //use the volts per dB slope to find the final interpolated voltage
+    volts = volts_vector[gain_step] + (slope * (gain - db_vector[gain_step]));
+        
+    if(tvrx_debug)
+        std::cout << "Gain interp: gain: " << gain << ", gain_step: " << int(gain_step) << ", slope: " << slope << ", volts: " << volts << std::endl;
+    
+    return volts;
+}
+
+/*!
+ * Convert a requested gain for the RF gain into a DAC voltage.
+ * The gain passed into the function will be set to the actual value.
+ * \param gain the requested gain in dB
+ * \return dac voltage value
+ */
+
+static float rf_gain_to_voltage(float gain, double lo_freq){
+    //clip the input
+    gain = std::clip<float>(gain, get_tvrx_gain_ranges()["RF"].min, get_tvrx_gain_ranges()["RF"].max);
+
+    //first we need to find out what band we're in, because gains are different across different bands
+    std::string band = get_band(lo_freq + tvrx_if_freq);
+
+    //this is the voltage at the TVRX gain input
+    float gain_volts = gain_interp(gain, tvrx_rf_gains_db[band], tvrx_gains_volts);
+    //this is the voltage at the USRP DAC output
+    float dac_volts = gain_volts / opamp_gain;
+    
+    dac_volts = std::clip<float>(dac_volts, 0.0, 3.3);
+
+    if (tvrx_debug) std::cerr << boost::format(
+        "tvrx RF AGC gain: %f dB, dac_volts: %f V"
+    ) % gain % dac_volts << std::endl;
+
+    return dac_volts;
+}
+
+/*!
+ * Convert a requested gain for the IF gain into a DAC voltage.
+ * The gain passed into the function will be set to the actual value.
+ * \param gain the requested gain in dB
+ * \return dac voltage value
+ */
+
+static float if_gain_to_voltage(float gain){
+    //clip the input
+    gain = std::clip<float>(gain, get_tvrx_gain_ranges()["IF"].min, get_tvrx_gain_ranges()["IF"].max);
+    
+    float gain_volts = gain_interp(gain, tvrx_if_gains_db, tvrx_gains_volts);
+    float dac_volts = gain_volts / opamp_gain;
+    
+    dac_volts = std::clip<float>(dac_volts, 0.0, 3.3);
+
+    if (tvrx_debug) std::cerr << boost::format(
+        "tvrx IF AGC gain: %f dB, dac_volts: %f V"
+    ) % gain % dac_volts << std::endl;
+
+    return dac_volts;
+}
+
+void tvrx::set_gain(float gain, const std::string &name){
+    assert_has(get_tvrx_gain_ranges().keys(), name, "tvrx gain name");
+    if (name == "RF"){
+        this->get_iface()->write_aux_dac(dboard_iface::UNIT_RX, dboard_iface::AUX_DAC_B, rf_gain_to_voltage(gain, _lo_freq));
+    }
+    else if(name == "IF"){
+        this->get_iface()->write_aux_dac(dboard_iface::UNIT_RX, dboard_iface::AUX_DAC_A, if_gain_to_voltage(gain));
+    }
+    else UHD_THROW_INVALID_CODE_PATH();
+    _gains[name] = gain;
+}
+
+/*!
+ * Set the tuner to center the desired frequency at 43.75MHz
+ * \param freq the requested frequency
+ */
+
+void tvrx::set_freq(double freq) {
+    freq = std::clip<float>(freq, tvrx_freq_range.min, tvrx_freq_range.max);
+    std::string prev_band = get_band(_lo_freq - tvrx_if_freq);
+    std::string new_band = get_band(freq);
+    
+    double target_lo_freq = freq + tvrx_if_freq; //the desired LO freq for high-side mixing
+    double f_ref = reference_freq / double(reference_divider); //your tuning step size
+    
+    int divisor = int((target_lo_freq + (f_ref * 4.0)) / (f_ref * 8)); //the divisor we'll use
+    double actual_lo_freq = (f_ref * 8 * divisor); //the LO freq we'll actually get
+    
+    if((divisor & ~0x7fff)) UHD_THROW_INVALID_CODE_PATH();
+    
+    //now we update the registers
+    _tuner_4937di5_regs.db1 = (divisor >> 8) & 0xff;
+    _tuner_4937di5_regs.db2 = divisor & 0xff;
+    
+    if(new_band == "VHFLO") _tuner_4937di5_regs.bandsel = tuner_4937di5_regs_t::BANDSEL_VHFLO;
+    else if(new_band == "VHFHI") _tuner_4937di5_regs.bandsel = tuner_4937di5_regs_t::BANDSEL_VHFHI;
+    else if(new_band == "UHF") _tuner_4937di5_regs.bandsel = tuner_4937di5_regs_t::BANDSEL_UHF;
+    else UHD_THROW_INVALID_CODE_PATH();
+    
+    _tuner_4937di5_regs.power = tuner_4937di5_regs_t::POWER_OFF;
+    update_regs();
+
+    //ok don't forget to reset RF gain here if the new band != the old band
+    //we do this because the gains are different for different band settings
+    //not FAR off, but we do this to be consistent
+    if(prev_band != new_band) set_gain(_gains["RF"], "RF");
+    
+    if(tvrx_debug) 
+        std::cout << boost::format("set_freq: target LO: %f f_ref: %f divisor: %i actual LO: %f") % target_lo_freq % f_ref % divisor % actual_lo_freq << std::endl;
+    
+    _lo_freq = actual_lo_freq; //for rx props
+}
+
+/***********************************************************************
+ * Get the alias frequency of frequency freq when sampled at fs.
+ * \param freq the frequency of interest
+ * \param fs the sample rate
+ * \return the alias frequency
+ **********************************************************************/
+
+static double get_alias(double freq, double fs) {
+    double alias;
+    freq = fmod(freq, fs);
+    if(freq >= (fs/2)) {
+        alias = fs - freq;
+    } else {
+        alias = freq;
+    }
+    return alias;
+}
+
+/***********************************************************************
+ * RX Get and Set
+ **********************************************************************/
+void tvrx::rx_get(const wax::obj &key_, wax::obj &val){
+    named_prop_t key = named_prop_t::extract(key_);
+    double codec_rate;
+
+    //handle the get request conditioned on the key
+    switch(key.as<subdev_prop_t>()){
+    case SUBDEV_PROP_NAME:
+        val = get_rx_id().to_pp_string();
+        return;
+
+    case SUBDEV_PROP_OTHERS:
+        val = prop_names_t(); //empty
+        return;
+
+    case SUBDEV_PROP_GAIN:
+        assert_has(_gains.keys(), key.name, "tvrx gain name");
+        val = _gains[key.name];
+        return;
+
+    case SUBDEV_PROP_GAIN_RANGE:
+        assert_has(get_tvrx_gain_ranges().keys(), key.name, "tvrx gain name");
+        val = get_tvrx_gain_ranges()[key.name];
+        return;
+
+    case SUBDEV_PROP_GAIN_NAMES:
+        val = prop_names_t(get_tvrx_gain_ranges().keys());
+        return;
+
+    case SUBDEV_PROP_FREQ:
+    /* 
+     * so here we have to do some magic. because the TVRX uses a relatively high IF,
+     * we have to watch the sample rate to see if the IF will be aliased
+     * or if it will fall within Nyquist.
+     */
+        codec_rate = this->get_iface()->get_codec_rate(dboard_iface::UNIT_RX);
+        val = (_lo_freq - tvrx_if_freq) + get_alias(tvrx_if_freq, codec_rate);
+        return;
+
+    case SUBDEV_PROP_FREQ_RANGE:
+        val = tvrx_freq_range;
+        return;
+
+    case SUBDEV_PROP_ANTENNA:
+        val = std::string(tvrx_antennas);
+        return;
+
+    case SUBDEV_PROP_ANTENNA_NAMES:
+        val = tvrx_antennas;
+        return;
+
+    case SUBDEV_PROP_CONNECTION:
+        val = SUBDEV_CONN_COMPLEX_IQ;
+        return;
+
+    case SUBDEV_PROP_USE_LO_OFFSET:
+        val = false;
+        return;
+
+    case SUBDEV_PROP_LO_LOCKED:
+        val = true;
+        return;
+
+    default: UHD_THROW_PROP_GET_ERROR();
+    }
+}
+
+void tvrx::rx_set(const wax::obj &key_, const wax::obj &val){
+    named_prop_t key = named_prop_t::extract(key_);
+
+    //handle the get request conditioned on the key
+    switch(key.as<subdev_prop_t>()){
+    case SUBDEV_PROP_GAIN:
+        this->set_gain(val.as<float>(), key.name);
+        return;
+    case SUBDEV_PROP_FREQ:
+        this->set_freq(val.as<double>());
+        return;
+
+    default: UHD_THROW_PROP_SET_ERROR();
+    }
+}
+
diff --git a/host/lib/usrp/usrp1/codec_ctrl.cpp b/host/lib/usrp/usrp1/codec_ctrl.cpp
index ad16f6b3a..4aa730573 100644
--- a/host/lib/usrp/usrp1/codec_ctrl.cpp
+++ b/host/lib/usrp/usrp1/codec_ctrl.cpp
@@ -61,6 +61,9 @@ public:
     float get_tx_pga_gain(void);
     void set_rx_pga_gain(float, char);
     float get_rx_pga_gain(char);
+    
+    //rx adc buffer control
+    void bypass_adc_buffers(bool bypass);
 
 private:
     usrp1_iface::sptr _iface;
@@ -419,6 +422,17 @@ void usrp1_codec_ctrl_impl::set_duc_freq(double freq)
 }
 
 /***********************************************************************
+ * Codec Control ADC buffer bypass
+ * Disable this for AC-coupled daughterboards (TVRX)
+ * By default it is initialized TRUE.
+ **********************************************************************/
+void usrp1_codec_ctrl_impl::bypass_adc_buffers(bool bypass) {
+    _ad9862_regs.byp_buffer_a = bypass;
+    _ad9862_regs.byp_buffer_b = bypass;
+    this->send_reg(2);
+}
+
+/***********************************************************************
  * Codec Control Make
  **********************************************************************/
 usrp1_codec_ctrl::sptr usrp1_codec_ctrl::make(usrp1_iface::sptr iface,
diff --git a/host/lib/usrp/usrp1/codec_ctrl.hpp b/host/lib/usrp/usrp1/codec_ctrl.hpp
index 259d10ef4..e2e8a010d 100644
--- a/host/lib/usrp/usrp1/codec_ctrl.hpp
+++ b/host/lib/usrp/usrp1/codec_ctrl.hpp
@@ -92,6 +92,9 @@ public:
 
     //! Set the TX modulator frequency
     virtual void set_duc_freq(double freq) = 0;
+    
+    //! Enable or disable ADC buffer bypass
+    virtual void bypass_adc_buffers(bool bypass) = 0;
 };
 
 #endif /* INCLUDED_USRP1_CODEC_CTRL_HPP */
diff --git a/host/lib/usrp/usrp1/dboard_iface.cpp b/host/lib/usrp/usrp1/dboard_iface.cpp
index 4791b55ce..1ac15a46a 100644
--- a/host/lib/usrp/usrp1/dboard_iface.cpp
+++ b/host/lib/usrp/usrp1/dboard_iface.cpp
@@ -32,6 +32,8 @@ using namespace uhd;
 using namespace uhd::usrp;
 using namespace boost::assign;
 
+static const dboard_id_t tvrx_id(0x0040);
+
 class usrp1_dboard_iface : public dboard_iface {
 public:
 
@@ -51,6 +53,10 @@ public:
         //init the clock rate shadows
         this->set_clock_rate(UNIT_RX, this->get_clock_rates(UNIT_RX).front());
         this->set_clock_rate(UNIT_TX, this->get_clock_rates(UNIT_TX).front());
+        
+        //yes this is evil but it's necessary for TVRX to work on USRP1
+        if(_rx_dboard_id == tvrx_id) _codec->bypass_adc_buffers(false);
+        //else _codec->bypass_adc_buffers(false); //don't think this is necessary
     }
 
     ~usrp1_dboard_iface()
@@ -93,6 +99,7 @@ public:
     std::vector<double> get_clock_rates(unit_t);
     double get_clock_rate(unit_t);
     void set_clock_enabled(unit_t, bool);
+    double get_codec_rate(unit_t);
 
 private:
     usrp1_iface::sptr _iface;
@@ -170,6 +177,10 @@ void usrp1_dboard_iface::set_clock_enabled(unit_t, bool)
     //TODO we can only enable for special case anyway...
 }
 
+double usrp1_dboard_iface::get_codec_rate(unit_t){
+    return _clock->get_master_clock_freq();
+}
+
 /***********************************************************************
  * GPIO
  **********************************************************************/
diff --git a/host/lib/usrp/usrp2/dboard_iface.cpp b/host/lib/usrp/usrp2/dboard_iface.cpp
index f6d2b718a..fdfbf0d17 100644
--- a/host/lib/usrp/usrp2/dboard_iface.cpp
+++ b/host/lib/usrp/usrp2/dboard_iface.cpp
@@ -61,6 +61,7 @@ public:
     double get_clock_rate(unit_t);
     std::vector<double> get_clock_rates(unit_t);
     void set_clock_enabled(unit_t, bool);
+    double get_codec_rate(unit_t);
 
     void write_spi(
         unit_t unit,
@@ -158,6 +159,9 @@ void usrp2_dboard_iface::set_clock_enabled(unit_t unit, bool enb){
     }
 }
 
+double usrp2_dboard_iface::get_codec_rate(unit_t){
+    return _clock_ctrl->get_master_clock_rate();
+}
 /***********************************************************************
  * GPIO
  **********************************************************************/