wbx: split wbx into daughterboard and granddaughterboard implementation

1 files changed, 555 insertions, 0 deletions

diff --git a/host/lib/usrp/dboard/db_wbx_common.cpp b/host/lib/usrp/dboard/db_wbx_common.cpp
new file mode 100644
index 000000000..3ad2dac6a
--- /dev/null
+++ b/host/lib/usrp/dboard/db_wbx_common.cpp
@@ -0,0 +1,555 @@
+//
+// Copyright 2011 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/>.
+//
+
+// Common IO Pins
+#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
+
+// Power functions
+#define TX_POWER_UP     (TX_PUP_5V|TX_PUP_3V|ADF4350_CE) // high enables power supply
+#define TX_POWER_DOWN   0
+
+#define RX_POWER_UP     (RX_PUP_5V|RX_PUP_3V|ADF4350_CE) // high enables power supply
+#define RX_POWER_DOWN   0
+
+#include "db_wbx_common.hpp"
+#include "adf4350_regs.hpp"
+#include <uhd/types/dict.hpp>
+#include <uhd/usrp/subdev_props.hpp>
+#include <uhd/types/ranges.hpp>
+#include <uhd/types/sensors.hpp>
+#include <uhd/utils/assert_has.hpp>
+#include <uhd/utils/algorithm.hpp>
+#include <uhd/utils/warning.hpp>
+#include <uhd/usrp/dboard_base.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 Common dboard constants
+ **********************************************************************/
+static const bool wbx_debug = false;
+
+static const uhd::dict<std::string, gain_range_t> wbx_tx_gain_ranges = map_list_of
+    ("PGA0", gain_range_t(0, 25, 0.05))
+;
+
+static const uhd::dict<std::string, gain_range_t> wbx_rx_gain_ranges = map_list_of
+    ("PGA0", gain_range_t(0, 31.5, 0.5))
+;
+
+/***********************************************************************
+ * WBX Common Implementation
+ **********************************************************************/
+wbx_base::wbx_base(ctor_args_t args) : xcvr_dboard_base(args){
+
+    //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 and atr controls
+    this->get_iface()->set_pin_ctrl(dboard_iface::UNIT_TX, TXMOD_EN|ADF4350_PDBRF);
+    this->get_iface()->set_pin_ctrl(dboard_iface::UNIT_RX, RXBB_PDB|ADF4350_PDBRF);
+    this->get_iface()->set_gpio_ddr(dboard_iface::UNIT_TX, TX_PUP_5V|TX_PUP_3V|ADF4350_CE|TXMOD_EN|ADF4350_PDBRF);
+    this->get_iface()->set_gpio_ddr(dboard_iface::UNIT_RX, RX_PUP_5V|RX_PUP_3V|ADF4350_CE|RXBB_PDB|ADF4350_PDBRF|RX_ATTN_MASK);
+
+    //setup ATR for the mixer enables
+    this->get_iface()->set_atr_reg(dboard_iface::UNIT_TX, dboard_iface::ATR_REG_IDLE,        TX_MIXER_DIS, TX_MIXER_DIS | TX_MIXER_ENB);
+    this->get_iface()->set_atr_reg(dboard_iface::UNIT_TX, dboard_iface::ATR_REG_RX_ONLY,     TX_MIXER_DIS, TX_MIXER_DIS | TX_MIXER_ENB);
+    this->get_iface()->set_atr_reg(dboard_iface::UNIT_TX, dboard_iface::ATR_REG_TX_ONLY,     TX_MIXER_ENB, TX_MIXER_DIS | TX_MIXER_ENB);
+    this->get_iface()->set_atr_reg(dboard_iface::UNIT_TX, dboard_iface::ATR_REG_FULL_DUPLEX, TX_MIXER_ENB, TX_MIXER_DIS | TX_MIXER_ENB);
+
+    this->get_iface()->set_atr_reg(dboard_iface::UNIT_RX, dboard_iface::ATR_REG_IDLE,        RX_MIXER_DIS, RX_MIXER_DIS | RX_MIXER_ENB);
+    this->get_iface()->set_atr_reg(dboard_iface::UNIT_RX, dboard_iface::ATR_REG_TX_ONLY,     RX_MIXER_DIS, RX_MIXER_DIS | RX_MIXER_ENB);
+    this->get_iface()->set_atr_reg(dboard_iface::UNIT_RX, dboard_iface::ATR_REG_RX_ONLY,     RX_MIXER_ENB, RX_MIXER_DIS | RX_MIXER_ENB);
+    this->get_iface()->set_atr_reg(dboard_iface::UNIT_RX, dboard_iface::ATR_REG_FULL_DUPLEX, RX_MIXER_ENB, RX_MIXER_DIS | RX_MIXER_ENB);
+
+    //set some default values
+    BOOST_FOREACH(const std::string &name, wbx_tx_gain_ranges.keys()){
+        set_tx_gain(wbx_tx_gain_ranges[name].start(), name);
+    }
+    BOOST_FOREACH(const std::string &name, wbx_rx_gain_ranges.keys()){
+        set_rx_gain(wbx_rx_gain_ranges[name].start(), name);
+    }
+    set_rx_enabled(false);
+    set_tx_enabled(false);
+}
+
+wbx_base::~wbx_base(void){
+    /* NOP */
+}
+
+/***********************************************************************
+ * Enables
+ **********************************************************************/
+void wbx_base::set_rx_enabled(bool enb){
+    this->get_iface()->set_gpio_out(dboard_iface::UNIT_RX,
+        (enb)? RX_POWER_UP : RX_POWER_DOWN, RX_POWER_UP | RX_POWER_DOWN
+    );
+}
+
+void wbx_base::set_tx_enabled(bool enb){
+    this->get_iface()->set_gpio_out(dboard_iface::UNIT_TX,
+        (enb)? TX_POWER_UP : TX_POWER_DOWN, TX_POWER_UP | TX_POWER_DOWN
+    );
+}
+
+/***********************************************************************
+ * Gain Handling
+ **********************************************************************/
+static int rx_pga0_gain_to_iobits(double &gain){
+    //clip the input
+    gain = wbx_rx_gain_ranges["PGA0"].clip(gain);
+
+    //convert to attenuation
+    double attn = wbx_rx_gain_ranges["PGA0"].stop() - gain;
+
+    //calculate the attenuation
+    int attn_code = boost::math::iround(attn*2);
+    int 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 % (iobits & RX_ATTN_MASK) % RX_ATTN_MASK << std::endl;
+
+    //the actual gain setting
+    gain = wbx_rx_gain_ranges["PGA0"].stop() - double(attn_code)/2;
+
+    return iobits;
+}
+
+static double tx_pga0_gain_to_dac_volts(double &gain){
+    //clip the input
+    gain = wbx_tx_gain_ranges["PGA0"].clip(gain);
+
+    //voltage level constants
+    static const double max_volts = 0.5, min_volts = 1.4;
+    static const double slope = (max_volts-min_volts)/wbx_tx_gain_ranges["PGA0"].stop();
+
+    //calculate the voltage for the aux dac
+    double 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;
+
+    //the actual gain setting
+    gain = (dac_volts - min_volts)/slope;
+
+    return dac_volts;
+}
+
+void wbx_base::set_tx_gain(double gain, const std::string &name){
+    assert_has(wbx_tx_gain_ranges.keys(), name, "wbx tx gain name");
+    if(name == "PGA0"){
+        double dac_volts = tx_pga0_gain_to_dac_volts(gain);
+        _tx_gains[name] = gain;
+
+        //write the new voltage to the aux dac
+        this->get_iface()->write_aux_dac(dboard_iface::UNIT_TX, dboard_iface::AUX_DAC_A, dac_volts);
+    }
+    else UHD_THROW_INVALID_CODE_PATH();
+}
+
+void wbx_base::set_rx_gain(double gain, const std::string &name){
+    assert_has(wbx_rx_gain_ranges.keys(), name, "wbx rx gain name");
+    if(name == "PGA0"){
+        boost::uint16_t io_bits = rx_pga0_gain_to_iobits(gain);
+        _rx_gains[name] = gain;
+
+        //write the new gain to rx gpio outputs
+        this->get_iface()->set_gpio_out(dboard_iface::UNIT_RX, io_bits, RX_ATTN_MASK);
+    }
+    else UHD_THROW_INVALID_CODE_PATH();
+}
+
+/***********************************************************************
+ * Tuning
+ **********************************************************************/
+double wbx_base::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;
+
+    //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=0, BS=0, N=0, FRAC=0, MOD=0;
+    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;
+    UHD_ASSERT_THROW(rfdivsel_to_enum.has_key(RFdiv));
+    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;
+}
+
+bool wbx_base::get_locked(dboard_iface::unit_t unit){
+    return (this->get_iface()->read_gpio(unit) & LOCKDET_MASK) != 0;
+}
+
+/***********************************************************************
+ * RX Get and Set
+ **********************************************************************/
+void wbx_base::rx_get(const wax::obj &key_, 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_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(_rx_gains.keys(), key.name, "wbx rx gain name");
+        val = _rx_gains[key.name];
+        return;
+
+    case SUBDEV_PROP_GAIN_RANGE:
+        assert_has(wbx_rx_gain_ranges.keys(), key.name, "wbx rx gain name");
+        val = wbx_rx_gain_ranges[key.name];
+        return;
+
+    case SUBDEV_PROP_GAIN_NAMES:
+        val = prop_names_t(wbx_rx_gain_ranges.keys());
+        return;
+
+    case SUBDEV_PROP_FREQ:
+        val = 0.0;
+        return;
+
+    case SUBDEV_PROP_FREQ_RANGE:
+        val = freq_range_t(0.0, 0.0, 0.0);;
+        return;
+
+    case SUBDEV_PROP_ANTENNA:
+        val = std::string("");
+        return;
+
+    case SUBDEV_PROP_ANTENNA_NAMES:
+        val = prop_names_t(1, "");
+        return;
+
+    case SUBDEV_PROP_CONNECTION:
+        val = SUBDEV_CONN_COMPLEX_IQ;
+        return;
+
+    case SUBDEV_PROP_ENABLED:
+        val = _rx_enabled;
+        return;
+
+    case SUBDEV_PROP_USE_LO_OFFSET:
+        val = false;
+        return;
+
+    case SUBDEV_PROP_SENSOR:
+        UHD_ASSERT_THROW(key.name == "lo_locked");
+        val = sensor_value_t("LO", this->get_locked(dboard_iface::UNIT_RX), "locked", "unlocked");
+        return;
+
+    case SUBDEV_PROP_SENSOR_NAMES:
+        val = prop_names_t(1, "lo_locked");
+        return;
+
+    case SUBDEV_PROP_BANDWIDTH:
+        val = 2*20.0e6; //20MHz low-pass, we want complex double-sided
+        return;
+
+    default: UHD_THROW_PROP_GET_ERROR();
+    }
+}
+
+void wbx_base::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_rx_gain(val.as<double>(), key.name);
+        return;
+
+    case SUBDEV_PROP_ENABLED:
+        _rx_enabled = val.as<bool>();
+        this->set_rx_enabled(_rx_enabled);
+        return;
+
+    case SUBDEV_PROP_BANDWIDTH:
+        uhd::warning::post(
+            str(boost::format("WBX: No tunable bandwidth, fixed filtered to 40MHz"))
+        );
+        return;
+
+    default: UHD_THROW_PROP_SET_ERROR();
+    }
+}
+
+/***********************************************************************
+ * TX Get and Set
+ **********************************************************************/
+void wbx_base::tx_get(const wax::obj &key_, 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_NAME:
+        val = get_tx_id().to_pp_string();
+        return;
+
+    case SUBDEV_PROP_OTHERS:
+        val = prop_names_t(); //empty
+        return;
+
+    case SUBDEV_PROP_GAIN:
+        assert_has(_tx_gains.keys(), key.name, "wbx tx gain name");
+        val = _tx_gains[key.name];
+        return;
+
+    case SUBDEV_PROP_GAIN_RANGE:
+        assert_has(wbx_tx_gain_ranges.keys(), key.name, "wbx tx gain name");
+        val = wbx_tx_gain_ranges[key.name];
+        return;
+
+    case SUBDEV_PROP_GAIN_NAMES:
+        val = prop_names_t(wbx_tx_gain_ranges.keys());
+        return;
+
+    case SUBDEV_PROP_FREQ:
+        val = 0.0;
+        return;
+
+    case SUBDEV_PROP_FREQ_RANGE:
+        val = freq_range_t(0.0, 0.0, 0.0);
+        return;
+
+    case SUBDEV_PROP_ANTENNA:
+        val = std::string("");
+        return;
+
+    case SUBDEV_PROP_ANTENNA_NAMES:
+        val = prop_names_t(1, "");
+        return;
+
+    case SUBDEV_PROP_CONNECTION:
+        val = SUBDEV_CONN_COMPLEX_IQ;
+        return;
+
+    case SUBDEV_PROP_ENABLED:
+        val = _tx_enabled;
+        return;
+
+    case SUBDEV_PROP_USE_LO_OFFSET:
+        val = false;
+        return;
+
+    case SUBDEV_PROP_SENSOR:
+        UHD_ASSERT_THROW(key.name == "lo_locked");
+        val = sensor_value_t("LO", this->get_locked(dboard_iface::UNIT_TX), "locked", "unlocked");
+        return;
+
+    case SUBDEV_PROP_SENSOR_NAMES:
+        val = prop_names_t(1, "lo_locked");
+        return;
+
+    case SUBDEV_PROP_BANDWIDTH:
+        val = 2*20.0e6; //20MHz low-pass, we want complex double-sided
+        return;
+
+    default: UHD_THROW_PROP_GET_ERROR();
+    }
+}
+
+void wbx_base::tx_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_tx_gain(val.as<double>(), key.name);
+        return;
+
+    case SUBDEV_PROP_ENABLED:
+        _tx_enabled = val.as<bool>();
+        this->set_tx_enabled(_tx_enabled);
+        return;
+
+    case SUBDEV_PROP_BANDWIDTH:
+        uhd::warning::post(
+            str(boost::format("WBX: No tunable bandwidth, fixed filtered to 40MHz"))
+        );
+        return;
+
+    default: UHD_THROW_PROP_SET_ERROR();
+    }
+}