Merge branch 'sbx-adi'

2 files changed, 794 insertions, 0 deletions

diff --git a/host/lib/usrp/dboard/CMakeLists.txt b/host/lib/usrp/dboard/CMakeLists.txt
index 7bd201294..36e988f30 100644
--- a/host/lib/usrp/dboard/CMakeLists.txt
+++ b/host/lib/usrp/dboard/CMakeLists.txt
@@ -24,6 +24,7 @@ LIBUHD_APPEND_SOURCES(
     ${CMAKE_CURRENT_SOURCE_DIR}/db_rfx.cpp
     ${CMAKE_CURRENT_SOURCE_DIR}/db_xcvr2450.cpp
     ${CMAKE_CURRENT_SOURCE_DIR}/db_wbx.cpp
+    ${CMAKE_CURRENT_SOURCE_DIR}/db_sbx.cpp
     ${CMAKE_CURRENT_SOURCE_DIR}/db_dbsrx.cpp
     ${CMAKE_CURRENT_SOURCE_DIR}/db_unknown.cpp
     ${CMAKE_CURRENT_SOURCE_DIR}/db_tvrx.cpp
diff --git a/host/lib/usrp/dboard/db_sbx.cpp b/host/lib/usrp/dboard/db_sbx.cpp
new file mode 100644
index 000000000..1fa169304
--- /dev/null
+++ b/host/lib/usrp/dboard/db_sbx.cpp
@@ -0,0 +1,793 @@
+//
+// 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/>.
+//
+
+// Common IO Pins
+#define LO_LPF_EN       (1 << 15)
+#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 TRSW            (1 << 14)               // 0 = TX, 1 = RX 
+#define TX_LED_TXRX     (1 << 7)                // LED for TX Antenna Selection TX/RX
+#define TX_LED_LD       (1 << 6)                // LED for TX Lock Detect
+#define DIS_POWER_TX    (1 << 5)                // on UNIT_TX, 0 powers up TX
+#define TX_ENABLE       (1 << 4)                // on UNIT_TX, 0 disables TX Mixer
+
+// RX IO Pins
+#define LNASW           (1 << 14)               // 0 = TX/RX, 1 = RX2
+#define RX_LED_RX1RX2   (1 << 7)                // LED for RX Antenna Selection RX1/RX2
+#define RX_LED_LD       (1 << 6)                // LED for RX Lock Detect
+#define DIS_POWER_RX    (1 << 5)                // on UNIT_RX, 0 powers up RX
+#define RX_DISABLE      (1 << 4)                // on UNIT_RX, 1 disables RX Mixer and 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
+
+// TX Attenuator Pins
+#define TX_ATTN_SHIFT   8                       // lsb of RX Attenuator Control
+#define TX_ATTN_MASK    (63 << TX_ATTN_SHIFT)   // valid bits of RX Attenuator Control
+
+// Mixer functions
+#define TX_MIXER_ENB    (ADF4350_PDBRF)
+#define TX_MIXER_DIS    0
+
+#define RX_MIXER_ENB    (ADF4350_PDBRF)
+#define RX_MIXER_DIS    0
+
+// Pin functions
+#define TX_LED_IO       (TX_LED_TXRX|TX_LED_LD)     // LED gpio lines, pull down for LED
+#define TXIO_MASK       (LO_LPF_EN|TRSW|ADF4350_CE|ADF4350_PDBRF|TX_ATTN_MASK|DIS_POWER_TX|TX_ENABLE)
+
+#define RX_LED_IO       (RX_LED_RX1RX2|RX_LED_LD)   // LED gpio lines, pull down for LED
+#define RXIO_MASK       (LO_LPF_EN|LNASW|ADF4350_CE|ADF4350_PDBRF|RX_ATTN_MASK|DIS_POWER_RX|RX_DISABLE)
+
+// Power functions
+#define TX_POWER_UP     (ADF4350_CE|TX_ENABLE)
+#define TX_POWER_DOWN   (DIS_POWER_TX)
+
+#define RX_POWER_UP     (ADF4350_CE)
+#define RX_POWER_DOWN   (DIS_POWER_RX)
+
+// Antenna constants
+#define ANT_TX          TRSW                    //the tx line is transmitting
+#define ANT_RX          0                       //the tx line is receiving
+#define ANT_TXRX        0                       //the rx line is on txrx
+#define ANT_RX2         LNASW                   //the rx line in on rx2
+#define ANT_XX          LNASW                   //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/types/sensors.hpp>
+#include <uhd/utils/assert_has.hpp>
+#include <uhd/utils/static.hpp>
+#include <uhd/utils/algorithm.hpp>
+#include <uhd/utils/warning.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>
+#include <boost/thread.hpp>
+
+using namespace uhd;
+using namespace uhd::usrp;
+using namespace boost::assign;
+
+/***********************************************************************
+ * The SBX dboard constants
+ **********************************************************************/
+static const bool sbx_debug = false;
+
+static const freq_range_t sbx_freq_range(68.75e6, 4.4e9);
+
+static const freq_range_t sbx_tx_lo_2dbm = list_of
+    (range_t(0.35e9, 0.37e9))
+;
+
+static const freq_range_t sbx_enable_tx_lo_filter = list_of
+    (range_t(0.4e9, 1.5e9))
+;
+
+static const freq_range_t sbx_enable_rx_lo_filter = list_of
+    (range_t(0.4e9, 1.5e9))
+;
+
+static const prop_names_t sbx_tx_antennas = list_of("TX/RX");
+
+static const prop_names_t sbx_rx_antennas = list_of("TX/RX")("RX2");
+
+static const uhd::dict<std::string, gain_range_t> sbx_tx_gain_ranges = map_list_of
+    ("PGA0", gain_range_t(0, 31.5, double(0.5)))
+;
+
+static const uhd::dict<std::string, gain_range_t> sbx_rx_gain_ranges = map_list_of
+    ("PGA0", gain_range_t(0, 31.5, double(0.5)))
+;
+
+/***********************************************************************
+ * The SBX dboard
+ **********************************************************************/
+class sbx_xcvr : public xcvr_dboard_base{
+public:
+    sbx_xcvr(ctor_args_t args);
+    ~sbx_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:
+    uhd::dict<std::string, double> _tx_gains, _rx_gains;
+    double       _rx_lo_freq, _tx_lo_freq;
+    std::string  _tx_ant, _rx_ant;
+
+    void set_rx_lo_freq(double freq);
+    void set_tx_lo_freq(double freq);
+    void set_rx_ant(const std::string &ant);
+    void set_tx_ant(const std::string &ant);
+    void set_rx_gain(double gain, const std::string &name);
+    void set_tx_gain(double gain, const std::string &name);
+
+    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;
+    }
+
+    /*!
+     * Flash the LEDs
+     */
+    void flash_leds(void) {
+        //Remove LED gpios from ATR control temporarily and set to outputs
+        this->get_iface()->set_pin_ctrl(dboard_iface::UNIT_TX, TXIO_MASK);
+        this->get_iface()->set_pin_ctrl(dboard_iface::UNIT_RX, RXIO_MASK);
+        this->get_iface()->set_gpio_ddr(dboard_iface::UNIT_TX, (TXIO_MASK|RX_LED_IO));
+        this->get_iface()->set_gpio_ddr(dboard_iface::UNIT_RX, (RXIO_MASK|RX_LED_IO));
+
+        /*
+        //flash All LEDs
+        for (int i = 0; i < 3; i++) {
+            this->get_iface()->set_gpio_out(dboard_iface::UNIT_RX, RX_LED_IO, RX_LED_IO);
+            this->get_iface()->set_gpio_out(dboard_iface::UNIT_TX, TX_LED_IO, TX_LED_IO);
+
+            boost::this_thread::sleep(boost::posix_time::milliseconds(100));
+
+            this->get_iface()->set_gpio_out(dboard_iface::UNIT_RX, 0, RX_LED_IO);
+            this->get_iface()->set_gpio_out(dboard_iface::UNIT_TX, 0, TX_LED_IO);
+
+            boost::this_thread::sleep(boost::posix_time::milliseconds(100));
+        }
+        */
+
+        this->get_iface()->set_gpio_out(dboard_iface::UNIT_TX, TX_LED_LD, TX_LED_IO);
+        boost::this_thread::sleep(boost::posix_time::milliseconds(100));
+
+        this->get_iface()->set_gpio_out(dboard_iface::UNIT_TX, TX_LED_TXRX|TX_LED_LD, TX_LED_IO);
+        boost::this_thread::sleep(boost::posix_time::milliseconds(100));
+
+        this->get_iface()->set_gpio_out(dboard_iface::UNIT_RX, RX_LED_LD, RX_LED_IO);
+        boost::this_thread::sleep(boost::posix_time::milliseconds(100));
+
+        this->get_iface()->set_gpio_out(dboard_iface::UNIT_RX, RX_LED_RX1RX2|RX_LED_LD, RX_LED_IO);
+        boost::this_thread::sleep(boost::posix_time::milliseconds(100));
+
+        this->get_iface()->set_gpio_out(dboard_iface::UNIT_RX, RX_LED_LD, RX_LED_IO);
+        boost::this_thread::sleep(boost::posix_time::milliseconds(100));
+
+        this->get_iface()->set_gpio_out(dboard_iface::UNIT_RX, 0, RX_LED_IO);
+        boost::this_thread::sleep(boost::posix_time::milliseconds(100));
+
+        this->get_iface()->set_gpio_out(dboard_iface::UNIT_TX, TX_LED_LD, TX_LED_IO);
+        boost::this_thread::sleep(boost::posix_time::milliseconds(100));
+
+        this->get_iface()->set_gpio_out(dboard_iface::UNIT_TX, 0, TX_LED_IO);
+        boost::this_thread::sleep(boost::posix_time::milliseconds(100));
+
+        /*
+        //flash All LEDs
+        for (int i = 0; i < 3; i++) {
+            this->get_iface()->set_gpio_out(dboard_iface::UNIT_RX, 0, RX_LED_IO);
+            this->get_iface()->set_gpio_out(dboard_iface::UNIT_TX, 0, TX_LED_IO);
+
+            boost::this_thread::sleep(boost::posix_time::milliseconds(100));
+
+            this->get_iface()->set_gpio_out(dboard_iface::UNIT_RX, RX_LED_IO, RX_LED_IO);
+            this->get_iface()->set_gpio_out(dboard_iface::UNIT_TX, TX_LED_IO, TX_LED_IO);
+
+            boost::this_thread::sleep(boost::posix_time::milliseconds(100));
+        }
+        */
+        //Put LED gpios back in ATR control and update atr
+        this->get_iface()->set_pin_ctrl(dboard_iface::UNIT_TX, (TXIO_MASK|TX_LED_IO));
+        this->get_iface()->set_pin_ctrl(dboard_iface::UNIT_RX, (RXIO_MASK|RX_LED_IO));
+        this->get_iface()->set_gpio_ddr(dboard_iface::UNIT_TX, (TXIO_MASK|TX_LED_IO));
+        this->get_iface()->set_gpio_ddr(dboard_iface::UNIT_RX, (RXIO_MASK|RX_LED_IO));
+    }
+
+};
+
+/***********************************************************************
+ * Register the SBX dboard (min freq, max freq, rx div2, tx div2)
+ **********************************************************************/
+static dboard_base::sptr make_sbx(dboard_base::ctor_args_t args){
+    return dboard_base::sptr(new sbx_xcvr(args));
+}
+
+UHD_STATIC_BLOCK(reg_sbx_dboards){
+    dboard_manager::register_dboard(0x0054, 0x0055, &make_sbx, "SBX");
+}
+
+/***********************************************************************
+ * Structors
+ **********************************************************************/
+sbx_xcvr::sbx_xcvr(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 (identically)
+    this->get_iface()->set_pin_ctrl(dboard_iface::UNIT_TX, (TXIO_MASK|TX_LED_IO));
+    this->get_iface()->set_pin_ctrl(dboard_iface::UNIT_RX, (RXIO_MASK|RX_LED_IO));
+    this->get_iface()->set_gpio_ddr(dboard_iface::UNIT_TX, (TXIO_MASK|TX_LED_IO));
+    this->get_iface()->set_gpio_ddr(dboard_iface::UNIT_RX, (RXIO_MASK|RX_LED_IO));
+
+    //flash LEDs
+    flash_leds();
+
+    if (sbx_debug) std::cerr << boost::format(
+        "SBX GPIO Direction: RX: 0x%08x, TX: 0x%08x"
+    ) % RXIO_MASK % TXIO_MASK << std::endl;
+
+    //set some default values
+    set_rx_lo_freq((sbx_freq_range.start() + sbx_freq_range.stop())/2.0);
+    set_tx_lo_freq((sbx_freq_range.start() + sbx_freq_range.stop())/2.0);
+    set_rx_ant("RX2");
+
+    BOOST_FOREACH(const std::string &name, sbx_tx_gain_ranges.keys()){
+        set_tx_gain(sbx_tx_gain_ranges[name].start(), name);
+    }
+    BOOST_FOREACH(const std::string &name, sbx_rx_gain_ranges.keys()){
+        set_rx_gain(sbx_rx_gain_ranges[name].start(), name);
+    }
+}
+
+sbx_xcvr::~sbx_xcvr(void){
+    /* NOP */
+}
+
+/***********************************************************************
+ * Gain Handling
+ **********************************************************************/
+static int rx_pga0_gain_to_iobits(double &gain){
+    //clip the input
+    gain = sbx_rx_gain_ranges["PGA0"].clip(gain);
+
+    //convert to attenuation and update iobits for atr
+    double attn = sbx_rx_gain_ranges["PGA0"].stop() - gain;
+
+    //calculate the RX attenuation
+    int attn_code = int(floor(attn*2));
+    int iobits = ((~attn_code) << RX_ATTN_SHIFT) & RX_ATTN_MASK;
+
+    
+    if (sbx_debug) std::cerr << boost::format(
+        "SBX TX 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 = sbx_rx_gain_ranges["PGA0"].stop() - double(attn_code)/2;
+
+    return iobits;
+}
+
+static int tx_pga0_gain_to_iobits(double &gain){
+    //clip the input
+    gain = sbx_tx_gain_ranges["PGA0"].clip(gain);
+
+    //convert to attenuation and update iobits for atr
+    double attn = sbx_tx_gain_ranges["PGA0"].stop() - gain;
+
+    //calculate the TX attenuation
+    int attn_code = int(floor(attn*2));
+    int iobits = ((~attn_code) << TX_ATTN_SHIFT) & TX_ATTN_MASK;
+
+    
+    if (sbx_debug) std::cerr << boost::format(
+        "SBX TX Attenuation: %f dB, Code: %d, IO Bits %x, Mask: %x"
+    ) % attn % attn_code % (iobits & TX_ATTN_MASK) % TX_ATTN_MASK << std::endl;
+
+    //the actual gain setting
+    gain = sbx_tx_gain_ranges["PGA0"].stop() - double(attn_code)/2;
+
+    return iobits;
+}
+
+void sbx_xcvr::set_tx_gain(double gain, const std::string &name){
+    assert_has(sbx_tx_gain_ranges.keys(), name, "sbx tx gain name");
+    if(name == "PGA0"){
+        tx_pga0_gain_to_iobits(gain);
+        _tx_gains[name] = gain;
+
+        //write the new gain to atr regs
+        update_atr();
+    }
+    else UHD_THROW_INVALID_CODE_PATH();
+}
+
+void sbx_xcvr::set_rx_gain(double gain, const std::string &name){
+    assert_has(sbx_rx_gain_ranges.keys(), name, "sbx rx gain name");
+    if(name == "PGA0"){
+        rx_pga0_gain_to_iobits(gain);
+        _rx_gains[name] = gain;
+
+        //write the new gain to atr regs
+        update_atr();
+    }
+    else UHD_THROW_INVALID_CODE_PATH();
+}
+
+/***********************************************************************
+ * Antenna Handling
+ **********************************************************************/
+void sbx_xcvr::update_atr(void){
+    //calculate atr pins
+    int rx_pga0_iobits = rx_pga0_gain_to_iobits(_rx_gains["PGA0"]);
+    int tx_pga0_iobits = tx_pga0_gain_to_iobits(_tx_gains["PGA0"]);
+    int rx_lo_lpf_en = (_rx_lo_freq == sbx_enable_rx_lo_filter.clip(_rx_lo_freq)) ? LO_LPF_EN : 0;
+    int tx_lo_lpf_en = (_tx_lo_freq == sbx_enable_tx_lo_filter.clip(_tx_lo_freq)) ? LO_LPF_EN : 0;
+    int rx_ld_led = get_locked(dboard_iface::UNIT_RX) ? 0 : RX_LED_LD;
+    int tx_ld_led = get_locked(dboard_iface::UNIT_TX) ? 0 : TX_LED_LD;
+    int rx_ant_led = _rx_ant == "TX/RX" ? RX_LED_RX1RX2 : 0;
+    int tx_ant_led = _rx_ant == "TX/RX" ? 0 : TX_LED_TXRX;
+
+    //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_pga0_iobits | tx_lo_lpf_en | tx_ld_led | tx_ant_led | TX_POWER_UP | ANT_XX | TX_MIXER_DIS);
+    this->get_iface()->set_atr_reg(dboard_iface::UNIT_TX, dboard_iface::ATR_REG_TX_ONLY,
+        tx_pga0_iobits | tx_lo_lpf_en | tx_ld_led | tx_ant_led | 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_pga0_iobits | tx_lo_lpf_en | tx_ld_led | tx_ant_led | 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_iobits | rx_lo_lpf_en | rx_ld_led | rx_ant_led | 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_iobits | rx_lo_lpf_en | rx_ld_led | rx_ant_led | RX_POWER_UP | ANT_RX2 | RX_MIXER_DIS);
+    this->get_iface()->set_atr_reg(dboard_iface::UNIT_RX, dboard_iface::ATR_REG_FULL_DUPLEX,
+        rx_pga0_iobits | rx_lo_lpf_en | rx_ld_led | rx_ant_led | RX_POWER_UP | ANT_RX2 | RX_MIXER_ENB);
+
+    //set the atr regs that change with antenna setting
+    this->get_iface()->set_atr_reg(dboard_iface::UNIT_TX, dboard_iface::ATR_REG_RX_ONLY,
+        tx_pga0_iobits | tx_lo_lpf_en | tx_ld_led | tx_ant_led | TX_POWER_UP | TX_MIXER_DIS |
+            ((_rx_ant == "TX/RX")? ANT_RX : ANT_TX));
+    this->get_iface()->set_atr_reg(dboard_iface::UNIT_RX, dboard_iface::ATR_REG_RX_ONLY,
+        rx_pga0_iobits | rx_lo_lpf_en | rx_ld_led | rx_ant_led | RX_POWER_UP | RX_MIXER_ENB | 
+            ((_rx_ant == "TX/RX")? ANT_TXRX : ANT_RX2));
+
+    if (sbx_debug) std::cerr << boost::format(
+        "SBX RXONLY ATR REG: 0x%08x"
+    ) % (rx_pga0_iobits | RX_POWER_UP | RX_MIXER_ENB | ((_rx_ant == "TX/RX")? ANT_TXRX : ANT_RX2)) << std::endl;
+}
+
+void sbx_xcvr::set_rx_ant(const std::string &ant){
+    //validate input
+    assert_has(sbx_rx_antennas, ant, "sbx rx antenna name");
+
+    //shadow the setting
+    _rx_ant = ant;
+
+    //write the new antenna setting to atr regs
+    update_atr();
+}
+
+void sbx_xcvr::set_tx_ant(const std::string &ant){
+    assert_has(sbx_tx_antennas, ant, "sbx tx antenna name");
+    //only one antenna option, do nothing
+}
+
+/***********************************************************************
+ * Tuning
+ **********************************************************************/
+void sbx_xcvr::set_rx_lo_freq(double freq){
+    _rx_lo_freq = set_lo_freq(dboard_iface::UNIT_RX, freq);
+}
+
+void sbx_xcvr::set_tx_lo_freq(double freq){
+    _tx_lo_freq = set_lo_freq(dboard_iface::UNIT_TX, freq);
+}
+
+double sbx_xcvr::set_lo_freq(
+    dboard_iface::unit_t unit,
+    double target_freq
+){
+    if (sbx_debug) std::cerr << boost::format(
+        "SBX tune: target frequency %f Mhz"
+    ) % (target_freq/1e6) << std::endl;
+
+    //clip the input
+    target_freq = sbx_freq_range.clip(target_freq);
+
+    //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;
+    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);
+
+    if (sbx_debug) {
+        std::cerr << 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;
+
+        std::cerr << boost::format("SBX 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("SBX 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;
+
+    if ((unit == dboard_iface::UNIT_TX) and (actual_freq == sbx_tx_lo_2dbm.clip(actual_freq))) 
+        regs.output_power = adf4350_regs_t::OUTPUT_POWER_2DBM;
+    else
+        regs.output_power = adf4350_regs_t::OUTPUT_POWER_5DBM;
+
+    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 (sbx_debug) std::cerr << boost::format(
+            "SBX 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 (sbx_debug) std::cerr << boost::format(
+        "SBX tune: actual frequency %f Mhz"
+    ) % (actual_freq/1e6) << std::endl;
+    return actual_freq;
+}
+
+/***********************************************************************
+ * RX Get and Set
+ **********************************************************************/
+void sbx_xcvr::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, "sbx rx gain name");
+        val = _rx_gains[key.name];
+        return;
+
+    case SUBDEV_PROP_GAIN_RANGE:
+        assert_has(sbx_rx_gain_ranges.keys(), key.name, "sbx rx gain name");
+        val = sbx_rx_gain_ranges[key.name];
+        return;
+
+    case SUBDEV_PROP_GAIN_NAMES:
+        val = prop_names_t(sbx_rx_gain_ranges.keys());
+        return;
+
+    case SUBDEV_PROP_FREQ:
+        val = _rx_lo_freq;
+        return;
+
+    case SUBDEV_PROP_FREQ_RANGE:
+        val = sbx_freq_range;
+        return;
+
+    case SUBDEV_PROP_ANTENNA:
+        val = _rx_ant;
+        return;
+
+    case SUBDEV_PROP_ANTENNA_NAMES:
+        val = sbx_rx_antennas;
+        return;
+
+    case SUBDEV_PROP_CONNECTION:
+        val = SUBDEV_CONN_COMPLEX_IQ;
+        return;
+
+    case SUBDEV_PROP_USE_LO_OFFSET:
+        val = false;
+        return;
+
+    case SUBDEV_PROP_ENABLED:
+        val = true; //always enabled
+        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 sbx_xcvr::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_FREQ:
+        this->set_rx_lo_freq(val.as<double>());
+        return;
+
+    case SUBDEV_PROP_GAIN:
+        this->set_rx_gain(val.as<double>(), key.name);
+        return;
+
+    case SUBDEV_PROP_ANTENNA:
+        this->set_rx_ant(val.as<std::string>());
+        return;
+
+    case SUBDEV_PROP_ENABLED:
+        return; //always enabled
+
+    case SUBDEV_PROP_BANDWIDTH:
+        uhd::warning::post(
+            str(boost::format("SBX: No tunable bandwidth, fixed filtered to 40MHz"))
+        );
+        return;
+
+    default: UHD_THROW_PROP_SET_ERROR();
+    }
+}
+
+/***********************************************************************
+ * TX Get and Set
+ **********************************************************************/
+void sbx_xcvr::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, "sbx tx gain name");
+        val = _tx_gains[key.name];
+        return;
+
+    case SUBDEV_PROP_GAIN_RANGE:
+        assert_has(sbx_tx_gain_ranges.keys(), key.name, "sbx tx gain name");
+        val = sbx_tx_gain_ranges[key.name];
+        return;
+
+    case SUBDEV_PROP_GAIN_NAMES:
+        val = prop_names_t(sbx_tx_gain_ranges.keys());
+        return;
+
+    case SUBDEV_PROP_FREQ:
+        val = _tx_lo_freq;
+        return;
+
+    case SUBDEV_PROP_FREQ_RANGE:
+        val = sbx_freq_range;
+        return;
+
+    case SUBDEV_PROP_ANTENNA:
+        val = std::string("TX/RX");
+        return;
+
+    case SUBDEV_PROP_ANTENNA_NAMES:
+        val = sbx_tx_antennas;
+        return;
+
+    case SUBDEV_PROP_CONNECTION:
+        val = SUBDEV_CONN_COMPLEX_QI;
+        return;
+
+    case SUBDEV_PROP_USE_LO_OFFSET:
+        val = false;
+        return;
+
+    case SUBDEV_PROP_ENABLED:
+        val = true; //always enabled
+        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 sbx_xcvr::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_FREQ:
+        this->set_tx_lo_freq(val.as<double>());
+        return;
+
+    case SUBDEV_PROP_GAIN:
+        this->set_tx_gain(val.as<double>(), key.name);
+        return;
+
+    case SUBDEV_PROP_ANTENNA:
+        this->set_tx_ant(val.as<std::string>());
+        return;
+
+    case SUBDEV_PROP_ENABLED:
+        return; //always enabled
+
+    case SUBDEV_PROP_BANDWIDTH:
+        uhd::warning::post(
+            str(boost::format("SBX: No tunable bandwidth, fixed filtered to 40MHz"))
+        );
+        return;
+
+    default: UHD_THROW_PROP_SET_ERROR();
+    }
+}