Merge branch 'master' of git@ettus.sourcerepo.com:ettus/uhdpriv into usrp_e

2 files changed, 633 insertions, 4 deletions

diff --git a/host/lib/usrp/dboard/db_wbx.cpp b/host/lib/usrp/dboard/db_wbx.cpp
new file mode 100644
index 000000000..2a8a3a9f2
--- /dev/null
+++ b/host/lib/usrp/dboard/db_wbx.cpp
@@ -0,0 +1,613 @@
+//
+// 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/>.
+//
+
+static const bool wbx_debug = false;
+
+// Common IO Pins
+#define ANTSW_IO        ((1 << 5)|(1 << 15))    // on UNIT_TX, 0 = TX, 1 = RX, on UNIT_RX 0 = main ant, 1 = RX2
+#define ADF4350_CE      (1 << 3)
+#define ADF4350_PDBRF   (1 << 2)
+#define ADF4350_MUXOUT  (1 << 1)                // INPUT!!!
+#define LOCKDET_MASK    (1 << 0)                // INPUT!!!
+
+// TX IO Pins
+#define TX_PUP_5V       (1 << 7)                // enables 5.0V power supply
+#define TX_PUP_3V       (1 << 6)                // enables 3.3V supply
+#define TXMOD_EN        (1 << 4)                // on UNIT_TX, 1 enables TX Modulator
+
+// RX IO Pins
+#define RX_PUP_5V       (1 << 7)                // enables 5.0V power supply
+#define RX_PUP_3V       (1 << 6)                // enables 3.3V supply
+#define RXBB_PDB        (1 << 4)                // on UNIT_RX, 1 powers up RX baseband
+
+// RX Attenuator Pins
+#define RX_ATTN_SHIFT   8                       // lsb of RX Attenuator Control
+#define RX_ATTN_MASK    (63 << RX_ATTN_SHIFT)      // valid bits of RX Attenuator Control
+
+// Mixer functions
+#define TX_MIXER_ENB    (TXMOD_EN|ADF4350_PDBRF)
+#define TX_MIXER_DIS    0
+
+#define RX_MIXER_ENB    (RXBB_PDB|ADF4350_PDBRF)
+#define RX_MIXER_DIS    0
+
+// Pin functions
+#define TX_POWER_IO     (TX_PUP_5V|TX_PUP_3V)   // high enables power supply
+#define TXIO_MASK       (TX_POWER_IO|ANTSW_IO|ADF4350_CE|ADF4350_PDBRF|TXMOD_EN)
+
+#define RX_POWER_IO     (RX_PUP_5V|RX_PUP_3V)   // high enables power supply
+#define RXIO_MASK       (RX_POWER_IO|ANTSW_IO|ADF4350_CE|ADF4350_PDBRF|RXBB_PDB|RX_ATTN_MASK)
+
+// Power functions
+#define TX_POWER_UP     (TX_POWER_IO|ADF4350_CE)
+#define TX_POWER_DOWN   0
+
+#define RX_POWER_UP     (RX_POWER_IO|ADF4350_CE)
+#define RX_POWER_DOWN   0
+
+// Antenna constants
+#define ANT_TX          0                       //the tx line is transmitting
+#define ANT_RX          ANTSW_IO                //the tx line is receiving
+#define ANT_TXRX        0                       //the rx line is on txrx
+#define ANT_RX2         ANTSW_IO                //the rx line in on rx2
+#define ANT_XX          0                       //dont care how the antenna is set
+
+#include "adf4350_regs.hpp"
+#include <uhd/types/dict.hpp>
+#include <uhd/usrp/subdev_props.hpp>
+#include <uhd/types/ranges.hpp>
+#include <uhd/utils/assert.hpp>
+#include <uhd/utils/static.hpp>
+#include <uhd/utils/algorithm.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/math/special_functions/round.hpp>
+
+using namespace uhd;
+using namespace uhd::usrp;
+using namespace boost::assign;
+
+/***********************************************************************
+ * The WBX dboard
+ **********************************************************************/
+static const float _max_rx_pga0_gain = 31.5;
+static const float _max_tx_pga0_gain = 25;
+
+class wbx_xcvr : public xcvr_dboard_base{
+public:
+    wbx_xcvr(
+        ctor_args_t args,
+        const freq_range_t &freq_range
+    );
+    ~wbx_xcvr(void);
+
+    void rx_get(const wax::obj &key, wax::obj &val);
+    void rx_set(const wax::obj &key, const wax::obj &val);
+
+    void tx_get(const wax::obj &key, wax::obj &val);
+    void tx_set(const wax::obj &key, const wax::obj &val);
+
+private:
+    freq_range_t _freq_range;
+    uhd::dict<dboard_iface::unit_t, bool> _div2;
+    double       _rx_lo_freq, _tx_lo_freq;
+    std::string  _rx_ant;
+    int          _rx_pga0_attn_iobits;
+    float        _rx_pga0_gain;
+    float        _tx_pga0_gain;
+
+    void set_rx_lo_freq(double freq);
+    void set_tx_lo_freq(double freq);
+    void set_rx_ant(const std::string &ant);
+    void set_rx_pga0_gain(float gain);
+    void set_rx_pga0_attn(float attn);
+    void set_tx_pga0_gain(float gain);
+
+    void update_atr(void);
+
+    /*!
+     * Set the LO frequency for the particular dboard unit.
+     * \param unit which unit rx or tx
+     * \param target_freq the desired frequency in Hz
+     * \return the actual frequency in Hz
+     */
+    double set_lo_freq(dboard_iface::unit_t unit, double target_freq);
+
+    /*!
+     * Get the lock detect status of the LO.
+     * \param unit which unit rx or tx
+     * \return true for locked
+     */
+    bool get_locked(dboard_iface::unit_t unit){
+        return (this->get_iface()->read_gpio(unit) & LOCKDET_MASK) != 0;
+    }
+};
+
+/***********************************************************************
+ * Register the WBX dboard (min freq, max freq, rx div2, tx div2)
+ **********************************************************************/
+static dboard_base::sptr make_wbx(dboard_base::ctor_args_t args){
+    return dboard_base::sptr(new wbx_xcvr(args, freq_range_t(50e6, 2220e6)));
+}
+
+UHD_STATIC_BLOCK(reg_wbx_dboards){
+    dboard_manager::register_dboard(0x0052, &make_wbx, "WBX RX");
+    dboard_manager::register_dboard(0x0053, &make_wbx, "WBX TX");
+}
+
+/***********************************************************************
+ * Structors
+ **********************************************************************/
+wbx_xcvr::wbx_xcvr(
+    ctor_args_t args,
+    const freq_range_t &freq_range
+) : xcvr_dboard_base(args){
+    _freq_range = freq_range;
+
+    //enable the clocks that we need
+    this->get_iface()->set_clock_enabled(dboard_iface::UNIT_TX, true);
+    this->get_iface()->set_clock_enabled(dboard_iface::UNIT_RX, true);
+
+    //set the gpio directions
+    this->get_iface()->set_gpio_ddr(dboard_iface::UNIT_TX, TXIO_MASK);
+    this->get_iface()->set_gpio_ddr(dboard_iface::UNIT_RX, RXIO_MASK);
+    if (wbx_debug) std::cerr << boost::format(
+        "WBX GPIO Direction: RX: 0x%08x, TX: 0x%08x"
+    ) % RXIO_MASK % TXIO_MASK << std::endl;
+
+    //set some default values
+    set_rx_lo_freq((_freq_range.min + _freq_range.max)/2.0);
+    set_tx_lo_freq((_freq_range.min + _freq_range.max)/2.0);
+    set_rx_ant("RX2");
+    set_rx_pga0_gain(0);
+    set_tx_pga0_gain(0);
+}
+
+wbx_xcvr::~wbx_xcvr(void){
+    /* NOP */
+}
+
+/***********************************************************************
+ * Helper Methods
+ **********************************************************************/
+void wbx_xcvr::update_atr(void){
+    //calculate atr pins
+
+    //setup the tx atr (this does not change with antenna)
+    this->get_iface()->set_atr_reg(dboard_iface::UNIT_TX, dboard_iface::ATR_REG_IDLE,        TX_POWER_UP | ANT_XX | TX_MIXER_DIS);
+    this->get_iface()->set_atr_reg(dboard_iface::UNIT_TX, dboard_iface::ATR_REG_RX_ONLY,     TX_POWER_UP | ANT_RX | TX_MIXER_DIS);
+    this->get_iface()->set_atr_reg(dboard_iface::UNIT_TX, dboard_iface::ATR_REG_TX_ONLY,     TX_POWER_UP | ANT_TX | TX_MIXER_ENB);
+    this->get_iface()->set_atr_reg(dboard_iface::UNIT_TX, dboard_iface::ATR_REG_FULL_DUPLEX, TX_POWER_UP | ANT_TX | TX_MIXER_ENB);
+
+    //setup the rx atr (this does not change with antenna)
+    this->get_iface()->set_atr_reg(dboard_iface::UNIT_RX, dboard_iface::ATR_REG_IDLE,
+        _rx_pga0_attn_iobits | RX_POWER_UP | ANT_XX | RX_MIXER_DIS);
+    this->get_iface()->set_atr_reg(dboard_iface::UNIT_RX, dboard_iface::ATR_REG_TX_ONLY,
+        _rx_pga0_attn_iobits | RX_POWER_UP | ANT_XX | RX_MIXER_DIS);
+    this->get_iface()->set_atr_reg(dboard_iface::UNIT_RX, dboard_iface::ATR_REG_FULL_DUPLEX,
+        _rx_pga0_attn_iobits | RX_POWER_UP | ANT_RX2| RX_MIXER_ENB);
+
+    //set the rx atr regs that change with antenna setting
+    this->get_iface()->set_atr_reg(dboard_iface::UNIT_RX, dboard_iface::ATR_REG_RX_ONLY,
+        _rx_pga0_attn_iobits | RX_POWER_UP | RX_MIXER_ENB | ((_rx_ant == "TX/RX")? ANT_TXRX : ANT_RX2));
+    if (wbx_debug) std::cerr << boost::format(
+        "WBX RXONLY ATR REG: 0x%08x"
+    ) % (_rx_pga0_attn_iobits | RX_POWER_UP | RX_MIXER_ENB | ((_rx_ant == "TX/RX")? ANT_TXRX : ANT_RX2)) << std::endl;
+}
+
+void wbx_xcvr::set_rx_lo_freq(double freq){
+    _rx_lo_freq = set_lo_freq(dboard_iface::UNIT_RX, freq);
+}
+
+void wbx_xcvr::set_tx_lo_freq(double freq){
+    _tx_lo_freq = set_lo_freq(dboard_iface::UNIT_TX, freq);
+}
+
+void wbx_xcvr::set_rx_ant(const std::string &ant){
+    //validate input
+    UHD_ASSERT_THROW(ant == "TX/RX" or ant == "RX2");
+
+    //shadow the setting
+    _rx_ant = ant;
+
+    //write the new antenna setting to atr regs
+    update_atr();
+}
+
+void wbx_xcvr::set_rx_pga0_gain(float gain){
+    //clip the input
+    gain = std::clip<float>(gain, 0, _max_rx_pga0_gain);
+
+    //shadow the setting (does not account for precision loss)
+    _rx_pga0_gain = gain;
+
+    //convert to attenuation and update iobits for atr
+    set_rx_pga0_attn(_max_rx_pga0_gain - gain);
+
+    //write the new gain to atr regs
+    update_atr();
+}
+
+void wbx_xcvr::set_rx_pga0_attn(float attn)
+{
+    int attn_code = int(floor(attn*2));
+    _rx_pga0_attn_iobits = ((~attn_code) << RX_ATTN_SHIFT) & RX_ATTN_MASK;
+    if (wbx_debug) std::cerr << boost::format(
+        "WBX Attenuation: %f dB, Code: %d, IO Bits %x, Mask: %x"
+    ) % attn % attn_code % (_rx_pga0_attn_iobits & RX_ATTN_MASK) % RX_ATTN_MASK << std::endl;
+}
+
+void wbx_xcvr::set_tx_pga0_gain(float gain){
+    //clip the input
+    gain = std::clip<float>(gain, 0, _max_tx_pga0_gain);
+
+    //voltage level constants
+    static const float max_volts = float(0.5), min_volts = float(1.4);
+    static const float slope = (max_volts-min_volts)/_max_rx_pga0_gain;
+
+    //calculate the voltage for the aux dac
+    float dac_volts = gain*slope + min_volts;
+
+    if (wbx_debug) std::cerr << boost::format(
+        "WBX TX Gain: %f dB, dac_volts: %f V"
+    ) % gain % dac_volts << std::endl;
+
+    //write the new voltage to the aux dac
+    this->get_iface()->write_aux_dac(dboard_iface::UNIT_TX, 0, dac_volts);
+
+    //shadow the setting (does not account for precision loss)
+    _tx_pga0_gain = gain;
+}
+
+double wbx_xcvr::set_lo_freq(
+    dboard_iface::unit_t unit,
+    double target_freq
+){
+    if (wbx_debug) std::cerr << boost::format(
+        "WBX tune: target frequency %f Mhz"
+    ) % (target_freq/1e6) << std::endl;
+
+    //clip the input
+    target_freq = std::clip(target_freq, _freq_range.min, _freq_range.max);
+
+    //map prescaler setting to mininmum integer divider (N) values (pg.18 prescaler)
+    static const uhd::dict<int, int> prescaler_to_min_int_div = map_list_of
+        (0,23) //adf4350_regs_t::PRESCALER_4_5
+        (1,75) //adf4350_regs_t::PRESCALER_8_9
+    ;
+
+    //map rf divider select output dividers to enums
+    static const uhd::dict<int, adf4350_regs_t::rf_divider_select_t> rfdivsel_to_enum = map_list_of
+        (1,  adf4350_regs_t::RF_DIVIDER_SELECT_DIV1)
+        (2,  adf4350_regs_t::RF_DIVIDER_SELECT_DIV2)
+        (4,  adf4350_regs_t::RF_DIVIDER_SELECT_DIV4)
+        (8,  adf4350_regs_t::RF_DIVIDER_SELECT_DIV8)
+        (16, adf4350_regs_t::RF_DIVIDER_SELECT_DIV16)
+    ;
+
+    double actual_freq, pfd_freq;
+    double ref_freq = this->get_iface()->get_clock_rate(unit);
+    int R, BS, N, FRAC, MOD;
+    int RFdiv = 1;
+    adf4350_regs_t::reference_divide_by_2_t T     = adf4350_regs_t::REFERENCE_DIVIDE_BY_2_DISABLED;
+    adf4350_regs_t::reference_doubler_t     D     = adf4350_regs_t::REFERENCE_DOUBLER_DISABLED;    
+
+    //Reference doubler for 50% duty cycle
+    // if ref_freq < 12.5MHz enable regs.reference_divide_by_2
+    if(ref_freq <= 12.5e6) D = adf4350_regs_t::REFERENCE_DOUBLER_ENABLED;
+
+    //increase RF divider until acceptable VCO frequency
+    //start with target_freq*2 because mixer has divide by 2
+    double vco_freq = target_freq*2;
+    while (vco_freq < 2.2e9) {
+        vco_freq *= 2;
+        RFdiv *= 2;
+    }
+
+    //use 8/9 prescaler for vco_freq > 3 GHz (pg.18 prescaler)
+    adf4350_regs_t::prescaler_t prescaler = vco_freq > 3e9 ? adf4350_regs_t::PRESCALER_8_9 : adf4350_regs_t::PRESCALER_4_5;
+
+    /*
+     * 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 exists 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_rf = f_vco/RFdiv)
+     * f_actual = f_rf/2
+     */
+    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*(1+D)/(R*(1+T));
+
+        //keep the PFD frequency at or below 25MHz (Loop Filter Bandwidth)
+        if (pfd_freq > 25e6) continue;
+
+        //ignore fractional part of tuning
+        N = int(std::floor(vco_freq/pfd_freq));
+
+        //keep N > minimum int divider requirement
+        if (N < prescaler_to_min_int_div[prescaler]) continue;
+
+        for(BS=1; BS <= 255; BS+=1){
+            //keep the band select frequency at or below 100KHz
+            //constraint on band select clock
+            if (pfd_freq/BS > 100e3) continue;
+            goto done_loop;
+        }
+    } done_loop:
+
+    //Fractional-N calculation
+    MOD = 4095; //max fractional accuracy
+    FRAC = int((vco_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
+    if(R % 2 == 0){
+        T = adf4350_regs_t::REFERENCE_DIVIDE_BY_2_ENABLED;
+        R /= 2;
+    }
+
+    //actual frequency calculation
+    actual_freq = double((N + (double(FRAC)/double(MOD)))*ref_freq*(1+int(D))/(R*(1+int(T)))/RFdiv/2);
+
+
+    if (wbx_debug) {
+        std::cerr << boost::format("WBX 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;
+
+        std::cerr << boost::format("WBX tune: R=%d, BS=%d, N=%d, FRAC=%d, MOD=%d, T=%d, D=%d, RFdiv=%d, LD=%d"
+            ) % R % BS % N % FRAC % MOD % T % D % RFdiv % get_locked(unit)<< std::endl
+        << boost::format("WBX Frequencies (MHz): REQ=%0.2f, ACT=%0.2f, VCO=%0.2f, PFD=%0.2f, BAND=%0.2f"
+            ) % (target_freq/1e6) % (actual_freq/1e6) % (vco_freq/1e6) % (pfd_freq/1e6) % (pfd_freq/BS/1e6) << std::endl;
+    }
+
+    //load the register values
+    adf4350_regs_t regs;
+
+    regs.frac_12_bit = FRAC;
+    regs.int_16_bit = N;
+    regs.mod_12_bit = MOD;
+    regs.prescaler = prescaler;
+    regs.r_counter_10_bit = R;
+    regs.reference_divide_by_2 = T;
+    regs.reference_doubler = D;
+    regs.band_select_clock_div = BS;
+    regs.rf_divider_select = rfdivsel_to_enum[RFdiv];
+
+    //write the registers
+    //correct power-up sequence to write registers (5, 4, 3, 2, 1, 0)
+    int addr;
+
+    for(addr=5; addr>=0; addr--){
+        if (wbx_debug) std::cerr << boost::format(
+            "WBX SPI Reg (0x%02x): 0x%08x"
+        ) % addr % regs.get_reg(addr) << std::endl;
+        this->get_iface()->write_spi(
+            unit, spi_config_t::EDGE_RISE,
+            regs.get_reg(addr), 32
+        );
+    }
+
+    //return the actual frequency
+    if (wbx_debug) std::cerr << boost::format(
+        "WBX tune: actual frequency %f Mhz"
+    ) % (actual_freq/1e6) << std::endl;
+    return actual_freq;
+}
+
+/***********************************************************************
+ * RX Get and Set
+ **********************************************************************/
+void wbx_xcvr::rx_get(const wax::obj &key_, wax::obj &val){
+    wax::obj key; std::string name;
+    boost::tie(key, name) = extract_named_prop(key_);
+
+    //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:
+        UHD_ASSERT_THROW(name == "PGA0");
+        val = _rx_pga0_gain;
+        return;
+
+    case SUBDEV_PROP_GAIN_RANGE:
+        UHD_ASSERT_THROW(name == "PGA0");
+        val = gain_range_t(0, _max_rx_pga0_gain, float(0.5));
+        return;
+
+    case SUBDEV_PROP_GAIN_NAMES:
+        val = prop_names_t(1, "PGA0");
+        return;
+
+    case SUBDEV_PROP_FREQ:
+        val = _rx_lo_freq;
+        return;
+
+    case SUBDEV_PROP_FREQ_RANGE:
+        val = _freq_range;
+        return;
+
+    case SUBDEV_PROP_ANTENNA:
+        val = _rx_ant;
+        return;
+
+    case SUBDEV_PROP_ANTENNA_NAMES:{
+            prop_names_t ants = list_of("TX/RX")("RX2");
+            val = ants;
+        }
+        return;
+
+    case SUBDEV_PROP_QUADRATURE:
+        val = true;
+        return;
+
+    case SUBDEV_PROP_IQ_SWAPPED:
+        val = false;
+        return;
+
+    case SUBDEV_PROP_SPECTRUM_INVERTED:
+        val = false;
+        return;
+
+    case SUBDEV_PROP_USE_LO_OFFSET:
+        val = false;
+        return;
+
+    case SUBDEV_PROP_LO_LOCKED:
+        val = this->get_locked(dboard_iface::UNIT_RX);
+        return;
+
+    default: UHD_THROW_PROP_GET_ERROR();
+    }
+}
+
+void wbx_xcvr::rx_set(const wax::obj &key_, const wax::obj &val){
+    wax::obj key; std::string name;
+    boost::tie(key, name) = extract_named_prop(key_);
+
+    //handle the get request conditioned on the key
+    switch(key.as<subdev_prop_t>()){
+
+    case SUBDEV_PROP_FREQ:
+        set_rx_lo_freq(val.as<double>());
+        return;
+
+    case SUBDEV_PROP_GAIN:
+        UHD_ASSERT_THROW(name == "PGA0");
+        set_rx_pga0_gain(val.as<float>());
+        return;
+
+    case SUBDEV_PROP_ANTENNA:
+        set_rx_ant(val.as<std::string>());
+        return;
+
+    default: UHD_THROW_PROP_SET_ERROR();
+    }
+}
+
+/***********************************************************************
+ * TX Get and Set
+ **********************************************************************/
+void wbx_xcvr::tx_get(const wax::obj &key_, wax::obj &val){
+    wax::obj key; std::string name;
+    boost::tie(key, name) = extract_named_prop(key_);
+
+    //handle the get request conditioned on the key
+    switch(key.as<subdev_prop_t>()){
+    case SUBDEV_PROP_NAME:
+        val = get_tx_id().to_pp_string();
+        return;
+
+    case SUBDEV_PROP_OTHERS:
+        val = prop_names_t(); //empty
+        return;
+
+    case SUBDEV_PROP_GAIN:
+        UHD_ASSERT_THROW(name == "PGA0");
+        val = _tx_pga0_gain;
+        return;
+
+    case SUBDEV_PROP_GAIN_RANGE:
+        UHD_ASSERT_THROW(name == "PGA0");
+        val = gain_range_t(0, _max_tx_pga0_gain, float(0.05));
+        return;
+
+    case SUBDEV_PROP_GAIN_NAMES:
+        val = prop_names_t(1, "PGA0");
+        return;
+
+    case SUBDEV_PROP_FREQ:
+        val = _tx_lo_freq;
+        return;
+
+    case SUBDEV_PROP_FREQ_RANGE:
+        val = _freq_range;
+        return;
+
+    case SUBDEV_PROP_ANTENNA:
+        val = std::string("TX/RX");
+        return;
+
+    case SUBDEV_PROP_ANTENNA_NAMES:
+        val = prop_names_t(1, "TX/RX");
+        return;
+
+    case SUBDEV_PROP_QUADRATURE:
+        val = true;
+        return;
+
+    case SUBDEV_PROP_IQ_SWAPPED:
+        val = false;
+        return;
+
+    case SUBDEV_PROP_SPECTRUM_INVERTED:
+        val = false;
+        return;
+
+    case SUBDEV_PROP_USE_LO_OFFSET:
+        val = false;
+        return;
+
+    case SUBDEV_PROP_LO_LOCKED:
+        val = this->get_locked(dboard_iface::UNIT_TX);
+        return;
+
+    default: UHD_THROW_PROP_GET_ERROR();
+    }
+}
+
+void wbx_xcvr::tx_set(const wax::obj &key_, const wax::obj &val){
+    wax::obj key; std::string name;
+    boost::tie(key, name) = extract_named_prop(key_);
+
+    //handle the get request conditioned on the key
+    switch(key.as<subdev_prop_t>()){
+
+    case SUBDEV_PROP_FREQ:
+        set_tx_lo_freq(val.as<double>());
+        return;
+
+    case SUBDEV_PROP_GAIN:
+        UHD_ASSERT_THROW(name == "PGA0");
+        set_tx_pga0_gain(val.as<float>());
+        return;
+
+    case SUBDEV_PROP_ANTENNA:
+        //its always set to tx/rx, so we only allow this value
+        UHD_ASSERT_THROW(val.as<std::string>() == "TX/RX");
+        return;
+
+    default: UHD_THROW_PROP_SET_ERROR();
+    }
+}
diff --git a/host/lib/usrp/usrp2/dsp_impl.cpp b/host/lib/usrp/usrp2/dsp_impl.cpp
index 84314a656..fc4c5479e 100644
--- a/host/lib/usrp/usrp2/dsp_impl.cpp
+++ b/host/lib/usrp/usrp2/dsp_impl.cpp
@@ -52,6 +52,23 @@ static boost::uint32_t calculate_freq_word_and_update_actual_freq(double &freq,
     return freq_word;
 }
 
+// Check if requested decim/interp rate is:
+//      multiple of 4, enable two halfband filters
+//      multiple of 2, enable one halfband filter
+//      handle remainder in CIC
+static boost::uint32_t calculate_cic_word(size_t rate){
+    int hb0 = 0, hb1 = 0;
+    if (not (rate & 0x1)){
+        hb0 = 1;
+        rate /= 2;
+    }
+    if (not (rate & 0x1)){
+        hb1 = 1;
+        rate /= 2;
+    }
+    return (hb1 << 9) | (hb0 << 8) | (rate & 0xff);
+}
+
 static boost::uint32_t calculate_iq_scale_word(boost::int16_t i, boost::int16_t q){
     return (boost::uint16_t(i) << 16) | (boost::uint16_t(q) << 0);
 }
@@ -84,7 +101,7 @@ void usrp2_impl::init_ddc_config(void){
 
 void usrp2_impl::update_ddc_config(void){
     //set the decimation
-    _iface->poke32(FR_DSP_RX_DECIM_RATE, _ddc_decim);
+    _iface->poke32(FR_DSP_RX_DECIM_RATE, calculate_cic_word(_ddc_decim));
 
     //set the scaling
     static const boost::int16_t default_rx_scale_iq = 1024;
@@ -163,15 +180,14 @@ void usrp2_impl::init_duc_config(void){
 
 void usrp2_impl::update_duc_config(void){
     // Calculate CIC interpolation (i.e., without halfband interpolators)
-    size_t tmp_interp = _duc_interp;
-    while(tmp_interp > 128) tmp_interp /= 2;
+    size_t tmp_interp = calculate_cic_word(_duc_interp) & 0xff;
 
     // Calculate closest multiplier constant to reverse gain absent scale multipliers
     double interp_cubed = std::pow(double(tmp_interp), 3);
     boost::int16_t scale = rint((4096*std::pow(2, ceil(log2(interp_cubed))))/(1.65*interp_cubed));
 
     //set the interpolation
-    _iface->poke32(FR_DSP_TX_INTERP_RATE, _ddc_decim);
+    _iface->poke32(FR_DSP_TX_INTERP_RATE, calculate_cic_word(_duc_interp));
 
     //set the scaling
     _iface->poke32(FR_DSP_TX_SCALE_IQ, calculate_iq_scale_word(scale, scale));