Merge branch 'master' of ettus.sourcerepo.com:ettus/uhdpriv into tvrx_uhd

27 files changed, 1392 insertions, 1211 deletions

diff --git a/host/lib/transport/CMakeLists.txt b/host/lib/transport/CMakeLists.txt
index 71a3a1494..61616d077 100644
--- a/host/lib/transport/CMakeLists.txt
+++ b/host/lib/transport/CMakeLists.txt
@@ -30,8 +30,11 @@ IF(LIBUSB_FOUND)
         ${CMAKE_SOURCE_DIR}/lib/transport/libusb1_control.cpp
         ${CMAKE_SOURCE_DIR}/lib/transport/libusb1_zero_copy.cpp
         ${CMAKE_SOURCE_DIR}/lib/transport/libusb1_base.cpp
-        ${CMAKE_SOURCE_DIR}/lib/transport/libusb1_device_handle.cpp
+        ${CMAKE_SOURCE_DIR}/lib/transport/libusb1_base.hpp
     )
+    IF(MSVC) #include our custom stdint for libusb
+        INCLUDE_DIRECTORIES(${CMAKE_SOURCE_DIR}/lib/transport/msvc)
+    ENDIF(MSVC)
     SET(HAVE_USB_SUPPORT TRUE)
 ENDIF(LIBUSB_FOUND)
 
diff --git a/host/lib/transport/gen_convert_types.py b/host/lib/transport/gen_convert_types.py
index adbd22868..f9509c81d 100755
--- a/host/lib/transport/gen_convert_types.py
+++ b/host/lib/transport/gen_convert_types.py
@@ -99,9 +99,9 @@ void transport::convert_io_type_to_otw_type(
             nsamps_per_io_buff
         );
         #else
-        for (size_t i = 0; i < nsamps_per_io_buff; i++){
+        for (size_t i = 0, j = 0; i < nsamps_per_io_buff; i++){
             #for $j in range($num_chans)
-            reinterpret_cast<$(out_type)_t *>(otw_buff)[i*$num_chans + $j] =
+            reinterpret_cast<$(out_type)_t *>(otw_buff)[j++] =
                 #if $ph.get_swap_type($pred) == 'bswap'
                 uhd::byteswap($(converter)(reinterpret_cast<const $(in_type)_t *>(io_buffs[$j])[i]));
                 #else
@@ -139,13 +139,13 @@ void transport::convert_otw_type_to_io_type(
             nsamps_per_io_buff
         );
         #else
-        for (size_t i = 0; i < nsamps_per_io_buff; i++){
+        for (size_t i = 0, j = 0; i < nsamps_per_io_buff; i++){
             #for $j in range($num_chans)
             reinterpret_cast<$(out_type)_t *>(io_buffs[$j])[i] =
                 #if $ph.get_swap_type($pred) == 'bswap'
-                $(converter)(uhd::byteswap(reinterpret_cast<const $(in_type)_t *>(otw_buff)[i*$num_chans + $j]));
+                $(converter)(uhd::byteswap(reinterpret_cast<const $(in_type)_t *>(otw_buff)[j++]));
                 #else
-                $(converter)(reinterpret_cast<const $(in_type)_t *>(otw_buff)[i*$num_chans + $j]);
+                $(converter)(reinterpret_cast<const $(in_type)_t *>(otw_buff)[j++]);
                 #end if
             #end for
         }
diff --git a/host/lib/transport/libusb1_base.cpp b/host/lib/transport/libusb1_base.cpp
index e21c39aa3..26e864459 100644
--- a/host/lib/transport/libusb1_base.cpp
+++ b/host/lib/transport/libusb1_base.cpp
@@ -17,110 +17,258 @@
 
 #include "libusb1_base.hpp"
 #include <uhd/utils/assert.hpp>
+#include <uhd/types/dict.hpp>
+#include <boost/weak_ptr.hpp>
+#include <boost/foreach.hpp>
+#include <boost/thread.hpp>
 #include <iostream>
 
 using namespace uhd::transport;
 
-/**********************************************************
- * Helper Methods
- **********************************************************/
+/***********************************************************************
+ * libusb session
+ **********************************************************************/
+class libusb_session_impl : public libusb::session{
+public:
+    libusb_session_impl(void){
+        UHD_ASSERT_THROW(libusb_init(&_context) == 0);
+        libusb_set_debug(_context, debug_level);
+        _thread_group.create_thread(boost::bind(&libusb_session_impl::run_event_loop, this));
+    }
 
-/**********************************************************
- * libusb namespace 
- **********************************************************/
-void libusb::init(libusb_context **ctx, int debug_level)
-{
-    if (libusb_init(ctx) < 0)
-        std::cerr << "error: libusb_init" << std::endl;
+    ~libusb_session_impl(void){
+        _running = false;
+        _thread_group.join_all();
+        libusb_exit(_context);
+    }
 
-    libusb_set_debug(*ctx, debug_level);
-}
+    libusb_context *get_context(void) const{
+        return _context;
+    }
 
-libusb_device_handle *libusb::open_device(libusb_context *ctx,
-                                          usb_device_handle::sptr handle)
-{
-    libusb_device_handle *dev_handle = NULL;
-    libusb_device **libusb_dev_list;
-    size_t dev_cnt = libusb_get_device_list(ctx, &libusb_dev_list);
-
-    //find and open the USB device 
-    for (size_t i = 0; i < dev_cnt; i++) {
-        libusb_device *dev = libusb_dev_list[i];
-
-        if (compare_device(dev, handle)) {
-            libusb_open(dev, &dev_handle);
-            libusb_unref_device(dev);
-            break;
+private:
+    libusb_context *_context;
+    boost::thread_group _thread_group;
+    bool _running;
+
+    void run_event_loop(void){
+        _running = true;
+        timeval tv;
+        while(_running){
+            tv.tv_sec = 0;
+            tv.tv_usec = 100000; //100ms
+            libusb_handle_events_timeout(this->get_context(), &tv);
         }
-            
-        libusb_unref_device(dev);
     }
+};
+
+libusb::session::sptr libusb::session::get_global_session(void){
+    static boost::weak_ptr<session> global_session;
+
+    //not expired -> get existing session
+    if (not global_session.expired()) return global_session.lock();
 
-    return dev_handle;
+    //create a new global session
+    sptr new_global_session(new libusb_session_impl());
+    global_session = new_global_session;
+    return new_global_session;
 }
 
-//note: changed order of checks so it only tries to get_serial and get_device_address if vid and pid match
-//doing this so it doesn't try to open the device if it's not ours
-bool libusb::compare_device(libusb_device *dev,
-                            usb_device_handle::sptr handle)
-{
-    std::string serial         = handle->get_serial();
-    boost::uint16_t vendor_id  = handle->get_vendor_id();
-    boost::uint16_t product_id = handle->get_product_id();
-    boost::uint8_t device_addr = handle->get_device_addr();
-
-    libusb_device_descriptor libusb_desc;
-    if (libusb_get_device_descriptor(dev, &libusb_desc) < 0)
-        return false;
-    if (vendor_id != libusb_desc.idVendor)
-        return false;
-    if (product_id != libusb_desc.idProduct)
-        return false; 
-    if (serial != get_serial(dev))
-        return false;
-    if (device_addr != libusb_get_device_address(dev))
-        return false;
-
-    return true;
+/***********************************************************************
+ * libusb device
+ **********************************************************************/
+class libusb_device_impl : public libusb::device{
+public:
+    libusb_device_impl(libusb_device *dev){
+        _session = libusb::session::get_global_session();
+        _dev = dev;
+    }
+
+    ~libusb_device_impl(void){
+        libusb_unref_device(this->get());
+    }
+
+    libusb_device *get(void) const{
+        return _dev;
+    }
+
+private:
+    libusb::session::sptr _session; //always keep a reference to session
+    libusb_device *_dev;
+};
+
+/***********************************************************************
+ * libusb device list
+ **********************************************************************/
+class libusb_device_list_impl : public libusb::device_list{
+public:
+    libusb_device_list_impl(void){
+        libusb::session::sptr sess = libusb::session::get_global_session();
+
+        //allocate a new list of devices
+        libusb_device** dev_list;
+        ssize_t ret = libusb_get_device_list(sess->get_context(), &dev_list);
+        if (ret < 0) throw std::runtime_error("cannot enumerate usb devices");
+
+        //fill the vector of device references
+        for (size_t i = 0; i < size_t(ret); i++) _devs.push_back(
+            libusb::device::sptr(new libusb_device_impl(dev_list[i]))
+        );
+
+        //free the device list but dont unref (done in ~device)
+        libusb_free_device_list(dev_list, false/*dont unref*/);
+    }
+
+    size_t size(void) const{
+        return _devs.size();
+    }
+
+    libusb::device::sptr at(size_t i) const{
+        return _devs.at(i);
+    }
+
+private:
+    std::vector<libusb::device::sptr> _devs;
+};
+
+libusb::device_list::sptr libusb::device_list::make(void){
+    return sptr(new libusb_device_list_impl());
 }
 
+/***********************************************************************
+ * libusb device descriptor
+ **********************************************************************/
+class libusb_device_descriptor_impl : public libusb::device_descriptor{
+public:
+    libusb_device_descriptor_impl(libusb::device::sptr dev){
+        _dev = dev;
+        UHD_ASSERT_THROW(libusb_get_device_descriptor(_dev->get(), &_desc) == 0);
+    }
 
-bool libusb::open_interface(libusb_device_handle *dev_handle,
-                            int interface)
-{
-    int ret = libusb_claim_interface(dev_handle, interface);
-    if (ret < 0) {
-        std::cerr << "error: libusb_claim_interface() " << ret << std::endl;
-        return false;
+    const libusb_device_descriptor &get(void) const{
+        return _desc;
     }
-    else {
-        return true;
+
+    std::string get_ascii_serial(void) const{
+        if (this->get().iSerialNumber == 0) return "";
+
+        libusb::device_handle::sptr handle(
+            libusb::device_handle::get_cached_handle(_dev)
+        );
+
+        unsigned char buff[512];
+        ssize_t ret = libusb_get_string_descriptor_ascii(
+            handle->get(), this->get().iSerialNumber, buff, sizeof(buff)
+        );
+        if (ret < 0) return ""; //on error, just return empty string
+
+        return std::string((char *)buff, ret);
     }
+
+private:
+    libusb::device::sptr _dev; //always keep a reference to device
+    libusb_device_descriptor _desc;
+};
+
+libusb::device_descriptor::sptr libusb::device_descriptor::make(device::sptr dev){
+    return sptr(new libusb_device_descriptor_impl(dev));
 }
 
+/***********************************************************************
+ * libusb device handle
+ **********************************************************************/
+class libusb_device_handle_impl : public libusb::device_handle{
+public:
+    libusb_device_handle_impl(libusb::device::sptr dev){
+        _dev = dev;
+        UHD_ASSERT_THROW(libusb_open(_dev->get(), &_handle) == 0);
+    }
+
+    ~libusb_device_handle_impl(void){
+        //release all claimed interfaces
+        for (size_t i = 0; i < _claimed.size(); i++){
+            libusb_release_interface(this->get(), _claimed[i]);
+        }
+        libusb_close(_handle);
+    }
+
+    libusb_device_handle *get(void) const{
+        return _handle;
+    }
 
-std::string libusb::get_serial(libusb_device *dev)
-{
-    unsigned char buff[32];
+    void claim_interface(int interface){
+        UHD_ASSERT_THROW(libusb_claim_interface(this->get(), interface) == 0);
+        _claimed.push_back(interface);
+    }
 
-    libusb_device_descriptor desc;
-    if (libusb_get_device_descriptor(dev, &desc) < 0)
-        return "";
+private:
+    libusb::device::sptr _dev; //always keep a reference to device
+    libusb_device_handle *_handle;
+    std::vector<int> _claimed;
+};
 
-    if (desc.iSerialNumber == 0)
-        return "";
+libusb::device_handle::sptr libusb::device_handle::get_cached_handle(device::sptr dev){
+    static uhd::dict<libusb_device *, boost::weak_ptr<device_handle> > handles;
 
-    //open the device because we have to
-    libusb_device_handle *dev_handle;
-    if (libusb_open(dev, &dev_handle) < 0)
-        return "";
+    //not expired -> get existing session
+    if (handles.has_key(dev->get()) and not handles[dev->get()].expired()){
+        return handles[dev->get()].lock();
+    }
 
-    if (libusb_get_string_descriptor_ascii(dev_handle, desc.iSerialNumber,
-                                           buff, sizeof(buff)) < 0) {
-        return "";
+    //create a new global session
+    sptr new_handle(new libusb_device_handle_impl(dev));
+    handles[dev->get()] = new_handle;
+    return new_handle;
+}
+
+/***********************************************************************
+ * libusb special handle
+ **********************************************************************/
+class libusb_special_handle_impl : public libusb::special_handle{
+public:
+    libusb_special_handle_impl(libusb::device::sptr dev){
+        _dev = dev;
     }
 
-    libusb_close(dev_handle);
+    libusb::device::sptr get_device(void) const{
+        return _dev;
+    }
+
+    std::string get_serial(void) const{
+        return libusb::device_descriptor::make(this->get_device())->get_ascii_serial();
+    }
+
+    boost::uint16_t get_vendor_id(void) const{
+        return libusb::device_descriptor::make(this->get_device())->get().idVendor;
+    }
+
+    boost::uint16_t get_product_id(void) const{
+        return libusb::device_descriptor::make(this->get_device())->get().idProduct;
+    }
+
+private:
+    libusb::device::sptr _dev; //always keep a reference to device
+};
+
+libusb::special_handle::sptr libusb::special_handle::make(device::sptr dev){
+    return sptr(new libusb_special_handle_impl(dev));
+}
+
+/***********************************************************************
+ * list device handles implementations
+ **********************************************************************/
+std::vector<usb_device_handle::sptr> usb_device_handle::get_device_list(
+    boost::uint16_t vid, boost::uint16_t pid
+){
+    std::vector<usb_device_handle::sptr> handles;
+
+    libusb::device_list::sptr dev_list = libusb::device_list::make();
+    for (size_t i = 0; i < dev_list->size(); i++){
+        usb_device_handle::sptr handle = libusb::special_handle::make(dev_list->at(i));
+        if (handle->get_vendor_id() == vid and handle->get_product_id() == pid){
+            handles.push_back(handle);
+        }
+    }
 
-    return (char*) buff;
+    return handles;
 }
diff --git a/host/lib/transport/libusb1_base.hpp b/host/lib/transport/libusb1_base.hpp
index abe5e22a2..04c1d6574 100644
--- a/host/lib/transport/libusb1_base.hpp
+++ b/host/lib/transport/libusb1_base.hpp
@@ -15,80 +15,135 @@
 // along with this program.  If not, see <http://www.gnu.org/licenses/>.
 //
 
-#ifndef INCLUDED_TRANSPORT_LIBUSB_HPP
-#define INCLUDED_TRANSPORT_LIBUSB_HPP
+#ifndef INCLUDED_LIBUHD_TRANSPORT_LIBUSB_HPP
+#define INCLUDED_LIBUHD_TRANSPORT_LIBUSB_HPP
 
 #include <uhd/config.hpp>
+#include <boost/utility.hpp>
+#include <boost/shared_ptr.hpp>
 #include <uhd/transport/usb_device_handle.hpp>
-#include <libusb-1.0/libusb.h>
+#include <libusb.h>
 
+/***********************************************************************
+ * Libusb object oriented smart pointer wrappers:
+ * The following wrappers provide allocation and automatic deallocation
+ * for various libusb data types and handles. The construction routines
+ * also store tables of already allocated structures to avoid multiple
+ * occurrences of opened handles (for example).
+ **********************************************************************/
 namespace uhd { namespace transport {
 
 namespace libusb {
-    /*
-     * Initialize libusb and set debug level
-     * Takes a pointer to context pointer because that's
-     * how libusb rolls. Debug levels.
-     *     
-     *   Level 0: no messages ever printed by the library (default)
-     *   Level 1: error messages are printed to stderr
-     *   Level 2: warning and error messages are printed to stderr
-     *   Level 3: informational messages are printed to stdout, warning
-     *            and error messages are printed to stderr
-     *
-     * \param ctx pointer to context pointer
-     * \param debug_level
+
+    /*!
+     * This session class holds a global libusb context for this process.
+     * The get global session call will create a new context if none exists.
+     * When all references to session are destroyed, the context will be freed.
      */
-    void init(libusb_context **ctx, int debug_level);
-
-    /*
-     * Open the device specified by a generic handle
-     * Find the libusb_device cooresponding to the generic handle
-     * and open it for I/O, which returns a libusb_device_handle
-     * ready for an interface
-     * \param ctx the libusb context used for init
-     * \return a libusb_device_handle ready for action 
+    class session : boost::noncopyable {
+    public:
+        typedef boost::shared_ptr<session> sptr;
+
+        /*!
+         *   Level 0: no messages ever printed by the library (default)
+         *   Level 1: error messages are printed to stderr
+         *   Level 2: warning and error messages are printed to stderr
+         *   Level 3: informational messages are printed to stdout, warning
+         *            and error messages are printed to stderr
+         */
+        static const int debug_level = 0;
+
+        //! get a shared pointer to the global session
+        static sptr get_global_session(void);
+
+        //! get the underlying libusb context pointer
+        virtual libusb_context *get_context(void) const = 0;
+    };
+
+    /*!
+     * Holds a device pointer with a reference to the session.
      */
-    libusb_device_handle *open_device(libusb_context *ctx,
-                                      usb_device_handle::sptr handle);
-
-    /*
-     * Compare a libusb device with a generic handle 
-     * Check the descriptors and open the device to check the
-     * serial number string. Compare values against the given
-     * handle. The libusb context is already implied in the
-     * libusb_device.
-     * \param dev a libusb_device pointer
-     * \param handle a generic handle specifier
-     * \return true if handle and device match, false otherwise
+    class device : boost::noncopyable {
+    public:
+        typedef boost::shared_ptr<device> sptr;
+
+        //! get the underlying device pointer
+        virtual libusb_device *get(void) const = 0;
+    };
+
+    /*!
+     * This device list class holds a device list that will be
+     * automatically freed when the last reference is destroyed.
      */
-    bool compare_device(libusb_device *dev, usb_device_handle::sptr handle);
-
-    /*
-     * Open an interface to the device
-     * This is a logical operation for operating system housekeeping as
-     * nothing is sent over the bus. The interface much correspond
-     * to the USB device descriptors.
-     * \param dev_handle libusb handle to an opened device
-     * \param interface integer of the interface to use
-     * \return true on success, false on error
+    class device_list : boost::noncopyable {
+    public:
+        typedef boost::shared_ptr<device_list> sptr;
+
+        //! make a new device list
+        static sptr make(void);
+
+        //! the number of devices in this list
+        virtual size_t size() const = 0;
+
+        //! get the device pointer at a particular index
+        virtual device::sptr at(size_t index) const = 0;
+    };
+
+    /*!
+     * Holds a device descriptor and a reference to the device.
      */
-    bool open_interface(libusb_device_handle *dev_handle, int interface);
-
-    /*
-     * Get serial number 
-     * The standard USB device descriptor contains an index to an
-     * actual serial number string descriptor. The index is readily
-     * readble, but the string descriptor requires probing the device.
-     * Because this call attempts to open the device, it may not
-     * succeed because not all USB devices are readily opened.
-     * The default language is used for the request (English).
-     * \param dev a libusb_device pointer
-     * \return string serial number or 0 on error or unavailablity
+    class device_descriptor : boost::noncopyable {
+    public:
+        typedef boost::shared_ptr<device_descriptor> sptr;
+
+        //! make a new descriptor from a device reference
+        static sptr make(device::sptr);
+
+        //! get the underlying device descriptor
+        virtual const libusb_device_descriptor &get(void) const = 0;
+
+        virtual std::string get_ascii_serial(void) const = 0;
+    };
+
+    /*!
+     * Holds a device handle and a reference to the device.
      */
-    std::string get_serial(libusb_device *dev);
+    class device_handle : boost::noncopyable {
+    public:
+        typedef boost::shared_ptr<device_handle> sptr;
+
+        //! get a cached handle or make a new one given the device
+        static sptr get_cached_handle(device::sptr);
+
+        //! get the underlying device handle
+        virtual libusb_device_handle *get(void) const = 0;
+
+        /*!
+         * Open USB interfaces for control using magic value
+         * IN interface:      2
+         * OUT interface:     1
+         * Control interface: 0
+         */
+        virtual void claim_interface(int) = 0;
+    };
+
+    /*!
+     * The special handle is our internal implementation of the
+     * usb device handle which is used publicly to identify a device.
+     */
+    class special_handle : public usb_device_handle {
+    public:
+        typedef boost::shared_ptr<special_handle> sptr;
+
+        //! make a new special handle from device
+        static sptr make(device::sptr);
+
+        //! get the underlying device reference
+        virtual device::sptr get_device(void) const = 0;
+    };
+
 }
 
 }} //namespace
 
-#endif /* INCLUDED_TRANSPORT_LIBUSB_HPP */
+#endif /* INCLUDED_LIBUHD_TRANSPORT_LIBUSB_HPP */
diff --git a/host/lib/transport/libusb1_control.cpp b/host/lib/transport/libusb1_control.cpp
index 3531128b2..c989a788c 100644
--- a/host/lib/transport/libusb1_control.cpp
+++ b/host/lib/transport/libusb1_control.cpp
@@ -20,7 +20,6 @@
 
 using namespace uhd::transport;
 
-const int libusb_debug_level = 0;
 const int libusb_timeout = 0;
 
 /***********************************************************************
@@ -28,68 +27,38 @@ const int libusb_timeout = 0;
  **********************************************************************/
 class libusb_control_impl : public usb_control {
 public:
-    libusb_control_impl(usb_device_handle::sptr handle);
-    ~libusb_control_impl();
+    libusb_control_impl(libusb::device_handle::sptr handle):
+        _handle(handle)
+    {
+        _handle->claim_interface(0 /* control interface */);
+    }
 
     size_t submit(boost::uint8_t request_type,
                   boost::uint8_t request,
                   boost::uint16_t value,
                   boost::uint16_t index,
                   unsigned char *buff,
-                  boost::uint16_t length); 
+                  boost::uint16_t length
+    ){
+        return libusb_control_transfer(_handle->get(),
+                                       request_type,
+                                       request,
+                                       value,
+                                       index,
+                                       buff,
+                                       length,
+                                       libusb_timeout);
+    }
 
 private:
-    libusb_context       *_ctx;
-    libusb_device_handle *_dev_handle;
+    libusb::device_handle::sptr _handle;
 };
 
-
-libusb_control_impl::libusb_control_impl(usb_device_handle::sptr handle)
-{
-    libusb::init(&_ctx, libusb_debug_level);
-
-    // Find and open the libusb_device corresponding to the
-    // given handle and return the libusb_device_handle
-    // that can be used for I/O purposes.
-    _dev_handle = libusb::open_device(_ctx, handle);
-
-    // Open USB interfaces for control using magic value
-    // IN interface:      2
-    // OUT interface:     1
-    // Control interface: 0
-    libusb::open_interface(_dev_handle, 0);
-}
-
-
-libusb_control_impl::~libusb_control_impl()
-{
-    libusb_close(_dev_handle);
-    libusb_exit(_ctx);
-}
-
-
-size_t libusb_control_impl::submit(boost::uint8_t request_type,
-                                   boost::uint8_t request,
-                                   boost::uint16_t value,
-                                   boost::uint16_t index, 
-                                   unsigned char *buff,
-                                   boost::uint16_t length) 
-{
-    return libusb_control_transfer(_dev_handle,
-                                   request_type,
-                                   request,
-                                   value,
-                                   index,
-                                   buff, 
-                                   length, 
-                                   libusb_timeout);
-}
-
-
 /***********************************************************************
  * USB control public make functions
  **********************************************************************/
-usb_control::sptr usb_control::make(usb_device_handle::sptr handle)
-{
-    return sptr(new libusb_control_impl(handle));
+usb_control::sptr usb_control::make(usb_device_handle::sptr handle){
+    return sptr(new libusb_control_impl(libusb::device_handle::get_cached_handle(
+        boost::static_pointer_cast<libusb::special_handle>(handle)->get_device()
+    )));
 }
diff --git a/host/lib/transport/libusb1_device_handle.cpp b/host/lib/transport/libusb1_device_handle.cpp
deleted file mode 100644
index 43d0f0e26..000000000
--- a/host/lib/transport/libusb1_device_handle.cpp
+++ /dev/null
@@ -1,117 +0,0 @@
-//
-// 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/>.
-//
-
-#include "libusb1_base.hpp"
-#include <uhd/utils/assert.hpp>
-#include <iostream>
-
-using namespace uhd::transport;
-
-const int libusb_debug_level = 0;
-
-/****************************************************************
- * libusb USB device handle implementation class
- ***************************************************************/
-class libusb1_device_handle_impl : public usb_device_handle {
-public:
-    libusb1_device_handle_impl(std::string serial,
-                               boost::uint32_t product_id,
-                               boost::uint32_t vendor_id,
-                               boost::uint32_t device_addr)
-      : _serial(serial), _product_id(product_id), 
-        _vendor_id(vendor_id), _device_addr(device_addr)
-    {
-        /* NOP */
-    }
-
-    ~libusb1_device_handle_impl()
-    {
-        /* NOP */
-    }
-
-    std::string get_serial() const
-    {
-        return _serial;
-    }
-
-    boost::uint16_t get_vendor_id() const
-    {
-        return _vendor_id;
-    }
-
-
-    boost::uint16_t get_product_id() const
-    {
-        return _product_id;
-    }
-
-    boost::uint16_t get_device_addr() const
-    {
-        return _device_addr;
-    }
-
-private:
-    std::string     _serial;
-    boost::uint32_t _product_id;
-    boost::uint32_t _vendor_id;
-    boost::uint32_t _device_addr;
-};
-
-
-usb_device_handle::sptr make_usb_device_handle(libusb_device *dev)
-{
-    libusb_device_descriptor desc;
-
-    if (libusb_get_device_descriptor(dev, &desc) < 0) {
-        UHD_ASSERT_THROW("USB: failed to get device descriptor");
-    }
-
-    std::string     serial      = libusb::get_serial(dev);
-    boost::uint32_t product_id  = desc.idProduct;
-    boost::uint32_t vendor_id   = desc.idVendor;
-    boost::uint32_t device_addr = libusb_get_device_address(dev);
-
-    return usb_device_handle::sptr(new libusb1_device_handle_impl(
-        serial,
-        product_id,
-        vendor_id,
-        device_addr));
-}
-
-std::vector<usb_device_handle::sptr> usb_device_handle::get_device_list(boost::uint16_t vid, boost::uint16_t pid)
-{
-    libusb_context *ctx = NULL;
-    libusb_device** libusb_device_list;
-    std::vector<usb_device_handle::sptr> device_handle_list;
-    libusb_device_descriptor desc;
-
-    libusb::init(&ctx, libusb_debug_level);
-
-    size_t dev_size = libusb_get_device_list(ctx, &libusb_device_list);
-    for (size_t i = 0; i < dev_size; i++) {
-        libusb_device *dev = libusb_device_list[i];
-        if(libusb_get_device_descriptor(dev, &desc) < 0) {
-          UHD_ASSERT_THROW("USB: failed to get device descriptor");
-        }
-        if(desc.idVendor == vid && desc.idProduct == pid) {
-          device_handle_list.push_back(make_usb_device_handle(dev));
-        }
-    }
-
-    libusb_exit(ctx);
-    return device_handle_list; 
-}
diff --git a/host/lib/transport/libusb1_zero_copy.cpp b/host/lib/transport/libusb1_zero_copy.cpp
index b890a87f9..b089d11e0 100644
--- a/host/lib/transport/libusb1_zero_copy.cpp
+++ b/host/lib/transport/libusb1_zero_copy.cpp
@@ -17,15 +17,17 @@
 
 #include "libusb1_base.hpp"
 #include <uhd/transport/usb_zero_copy.hpp>
+#include <uhd/transport/bounded_buffer.hpp>
 #include <uhd/utils/assert.hpp>
-#include <boost/asio.hpp>
-#include <boost/format.hpp>
+#include <boost/shared_array.hpp>
+#include <boost/foreach.hpp>
+#include <boost/thread.hpp>
+#include <vector>
 #include <iostream>
 #include <iomanip>
 
 using namespace uhd::transport;
 
-const int libusb_debug_level = 0;
 const int libusb_timeout = 0;
 
 /***********************************************************************
@@ -57,53 +59,57 @@ void pp_transfer(libusb_transfer *lut)
  *   interface provided by the kernel. 
  **********************************************************************/
 class usb_endpoint {
+public:
+    typedef boost::shared_ptr<usb_endpoint> sptr;
+
+    usb_endpoint(
+        libusb::device_handle::sptr handle,
+        int endpoint,
+        bool input,
+        size_t transfer_size,
+        size_t num_transfers
+    );
+
+    ~usb_endpoint(void);
+
+    // Exposed interface for submitting / retrieving transfer buffers
+
+    //! Submit a new transfer that was presumably just filled or emptied.
+    void submit(libusb_transfer *lut);
+
+    /*!
+     * Get an available transfer:
+     * For inputs, this is a just filled transfer.
+     * For outputs, this is a just emptied transfer.
+     * \param timeout_ms the timeout to wait for a lut
+     * \return the transfer pointer or NULL if timeout
+     */
+    libusb_transfer *get_lut_with_wait(size_t timeout_ms = 100);
+
+    //Callback use only
+    void callback_handle_transfer(libusb_transfer *lut);
+
 private:
-    libusb_device_handle *_dev_handle;
-    libusb_context *_ctx;
+    libusb::device_handle::sptr _handle;
     int  _endpoint;
     bool _input;
 
     size_t _transfer_size;
     size_t _num_transfers;
 
-    // Transfer state lists (transfers are free, pending, or completed)
-    std::list<libusb_transfer *>  _free_list;
-    std::list<libusb_transfer *>  _pending_list;
-    std::list<libusb_transfer *>  _completed_list;
+    //! hold a bounded buffer of completed transfers
+    typedef bounded_buffer<libusb_transfer *> lut_buff_type;
+    lut_buff_type::sptr _completed_list;
+
+    //! a list of all transfer structs we allocated
+    std::vector<libusb_transfer *>  _all_luts;
+
+    //! a list of shared arrays for the transfer buffers
+    std::vector<boost::shared_array<boost::uint8_t> > _buffers;
 
     // Calls for processing asynchronous I/O 
     libusb_transfer *allocate_transfer(int buff_len);
-    bool cancel(libusb_transfer *lut);
-    bool cancel_all();
-    bool reap_pending_list();
-    bool reap_pending_list_timeout();
-    bool reap_completed_list();
-
-    // Transfer state manipulators 
-    void free_list_add(libusb_transfer *lut);
-    void pending_list_add(libusb_transfer *lut);
-    void completed_list_add(libusb_transfer *lut);
-    libusb_transfer *free_list_get();
-    libusb_transfer *completed_list_get();
-    bool pending_list_remove(libusb_transfer *lut);
-
-    // Debug use
     void print_transfer_status(libusb_transfer *lut);
-
-public:
-    usb_endpoint(libusb_device_handle *dev_handle,
-                 libusb_context *ctx, int endpoint, bool input,
-                 size_t transfer_size, size_t num_transfers);
-
-    ~usb_endpoint();
-
-    // Exposed interface for submitting / retrieving transfer buffers
-    bool submit(libusb_transfer *lut);
-    libusb_transfer *get_completed_transfer();
-    libusb_transfer *get_free_transfer();
-
-    //Callback use only
-    void callback_handle_transfer(libusb_transfer *lut);
 };
 
 
@@ -116,9 +122,8 @@ public:
  * it from the pending to completed status list.
  * \param lut pointer to libusb_transfer
  */
-static void callback(libusb_transfer *lut)
-{
-    usb_endpoint *endpoint = (usb_endpoint *) lut->user_data; 
+static void callback(libusb_transfer *lut){
+    usb_endpoint *endpoint = (usb_endpoint *) lut->user_data;
     endpoint->callback_handle_transfer(lut);
 }
 
@@ -127,14 +132,9 @@ static void callback(libusb_transfer *lut)
  * Accessor call to allow list access from callback space
  * \param pointer to libusb_transfer
  */
-void usb_endpoint::callback_handle_transfer(libusb_transfer *lut)
-{
-    if (!pending_list_remove(lut)) {
-        std::cerr << "USB: pending remove failed" << std::endl;
-        return;
-    }
-
-    completed_list_add(lut);    
+void usb_endpoint::callback_handle_transfer(libusb_transfer *lut){
+    boost::this_thread::disable_interruption di; //disable because the wait can throw
+    _completed_list->push_with_wait(lut);
 }
 
 
@@ -144,19 +144,28 @@ void usb_endpoint::callback_handle_transfer(libusb_transfer *lut)
  * submit the transfers so that they're ready to return when
  * data is available. 
  */
-usb_endpoint::usb_endpoint(libusb_device_handle *dev_handle,
-                          libusb_context *ctx, int endpoint, bool input,
-                          size_t transfer_size, size_t num_transfers)
-    : _dev_handle(dev_handle),
-      _ctx(ctx), _endpoint(endpoint), _input(input),
-      _transfer_size(transfer_size), _num_transfers(num_transfers)
+usb_endpoint::usb_endpoint(
+    libusb::device_handle::sptr handle,
+    int endpoint,
+    bool input,
+    size_t transfer_size,
+    size_t num_transfers
+):
+    _handle(handle),
+    _endpoint(endpoint),
+    _input(input),
+    _transfer_size(transfer_size),
+    _num_transfers(num_transfers)
 {
-    unsigned int i;
-    for (i = 0; i < _num_transfers; i++) {
-        free_list_add(allocate_transfer(_transfer_size));
+    _completed_list = lut_buff_type::make(num_transfers);
 
-        if (_input)
-            submit(free_list_get());
+    for (size_t i = 0; i < _num_transfers; i++){
+        _all_luts.push_back(allocate_transfer(_transfer_size));
+
+        //input luts are immediately submitted to be filled
+        //output luts go into the completed list as free buffers
+        if (_input) this->submit(_all_luts.back());
+        else _completed_list->push_with_wait(_all_luts.back());
     }
 }
 
@@ -168,22 +177,18 @@ usb_endpoint::usb_endpoint(libusb_device_handle *dev_handle,
  * the transfers. Libusb will deallocate the data buffer held by
  * each transfer.
  */
-usb_endpoint::~usb_endpoint()
-{
-    cancel_all();
-
-    while (!_pending_list.empty()) {
-        if (!reap_pending_list())
-            std::cerr << "error: destructor failed to reap" << std::endl;
+usb_endpoint::~usb_endpoint(void){
+    //cancel all transfers
+    BOOST_FOREACH(libusb_transfer *lut, _all_luts){
+        libusb_cancel_transfer(lut);
     }
 
-    while (!_completed_list.empty()) {
-        if (!reap_completed_list())
-            std::cerr << "error: destructor failed to reap" << std::endl;
-    }
+    //collect canceled transfers (drain the queue)
+    while (this->get_lut_with_wait() != NULL){};
 
-    while (!_free_list.empty()) {
-        libusb_free_transfer(free_list_get());
+    //free all transfers
+    BOOST_FOREACH(libusb_transfer *lut, _all_luts){
+        libusb_free_transfer(lut);
     }
 }
 
@@ -195,20 +200,21 @@ usb_endpoint::~usb_endpoint()
  * \param buff_len size of the individual buffer held by each transfer
  * \return pointer to an allocated libusb_transfer
  */
-libusb_transfer *usb_endpoint::allocate_transfer(int buff_len)
-{
+libusb_transfer *usb_endpoint::allocate_transfer(int buff_len){
     libusb_transfer *lut = libusb_alloc_transfer(0);
 
-    unsigned char *buff = new unsigned char[buff_len];
+    boost::shared_array<boost::uint8_t> buff(new boost::uint8_t[buff_len]);
+    _buffers.push_back(buff); //store a reference to this shared array
 
     unsigned int endpoint = ((_endpoint & 0x7f) | (_input ? 0x80 : 0));
+    libusb_transfer_cb_fn lut_callback = libusb_transfer_cb_fn(&callback);
 
     libusb_fill_bulk_transfer(lut,                // transfer
-                              _dev_handle,        // dev_handle
+                              _handle->get(),     // dev_handle
                               endpoint,           // endpoint
-                              buff,               // buffer
+                              buff.get(),         // buffer
                               buff_len,           // length
-                              callback,           // callback
+                              lut_callback,       // callback
                               this,               // user_data
                               0);                 // timeout
     return lut;
@@ -221,95 +227,15 @@ libusb_transfer *usb_endpoint::allocate_transfer(int buff_len)
  * \param lut pointer to libusb_transfer
  * \return true on success or false on error 
  */
-bool usb_endpoint::submit(libusb_transfer *lut)
-{
-    int retval;
-    if ((retval = libusb_submit_transfer(lut)) < 0) {
-        std::cerr << "error: libusb_submit_transfer: " << retval << std::endl;
-        return false;
-    }
-
-    pending_list_add(lut);
-    return true;
+void usb_endpoint::submit(libusb_transfer *lut){
+    UHD_ASSERT_THROW(libusb_submit_transfer(lut) == 0);
 }
 
-
-/*
- * Cancel a pending transfer 
- * Search the pending list for the transfer and cancel if found.
- * \param lut pointer to libusb_transfer to cancel
- * \return true on success or false if transfer is not found
- *
- * Note: success only indicates submission of cancelation request.
- * Sucessful cancelation is not known until the callback occurs.
- */
-bool usb_endpoint::cancel(libusb_transfer *lut)
-{
-    std::list<libusb_transfer*>::iterator iter;
-    for (iter = _pending_list.begin(); iter != _pending_list.end(); iter++) {
-        if (*iter == lut) { 
-            libusb_cancel_transfer(lut); 
-            return true;
-        }
-    }
-    return false;
-}
-
-
-/*
- * Cancel all pending transfers 
- * \return bool true if cancelation request is submitted
- *
- * Note: success only indicates submission of cancelation request.
- * Sucessful cancelation is not known until the callback occurs.
- */
-bool usb_endpoint::cancel_all()
-{
-    std::list<libusb_transfer*>::iterator iter;
-
-    for (iter = _pending_list.begin(); iter != _pending_list.end(); iter++) {
-        if (libusb_cancel_transfer(*iter) < 0) {
-            std::cerr << "error: libusb_cancal_transfer() failed" << std::endl;
-            return false;
-        }
-    }
-
-    return true;
-}
-
-
-/*
- * Reap completed transfers
- * return true if at least one transfer was reaped, false otherwise. 
- * Check completed transfers for errors and mark as free. This is a
- * blocking call. 
- * \return bool true if a libusb transfer is reaped, false otherwise
- */
-bool usb_endpoint::reap_completed_list()
-{
-    libusb_transfer *lut;
-
-    if (_completed_list.empty()) {
-        if (!reap_pending_list_timeout())
-            return false;
-    }
-
-    while (!_completed_list.empty()) {
-        lut = completed_list_get();
-        print_transfer_status(lut);
-        free_list_add(lut);
-    }
-
-    return true;
-}
-
-
 /*
  * Print status errors of a completed transfer
  * \param lut pointer to an libusb_transfer
  */
-void usb_endpoint::print_transfer_status(libusb_transfer *lut)
-{
+void usb_endpoint::print_transfer_status(libusb_transfer *lut){
     switch (lut->status) {
     case LIBUSB_TRANSFER_COMPLETED:
         if (lut->actual_length < lut->length) {
@@ -345,166 +271,15 @@ void usb_endpoint::print_transfer_status(libusb_transfer *lut)
     }
 }
 
-
-/*
- * Reap pending transfers without timeout 
- * This is a blocking call. Reaping submitted transfers is
- * handled by libusb and the assigned callback function.
- * Block until at least one transfer is reaped.
- * \return true true if a transfer was reaped or false otherwise
- */
-bool usb_endpoint::reap_pending_list()
-{
-    int retval;
-
-    if ((retval = libusb_handle_events(_ctx)) < 0) {
-        std::cerr << "error: libusb_handle_events: " << retval << std::endl;
-        return false;
-    }
-
-    return true;
-}
-
-
-/*
- * Reap pending transfers with timeout 
- * This call blocks until a transfer is reaped or timeout.
- * Reaping submitted transfers is handled by libusb and the
- * assigned callback function. Block until at least one
- * transfer is reaped or timeout occurs.
- * \return true if a transfer was reaped or false otherwise
- */
-bool usb_endpoint::reap_pending_list_timeout()
-{
-    int retval;
-    timeval tv;
-
-    tv.tv_sec = 0;
-    tv.tv_usec = 100000; //100ms
-
-    size_t pending_list_size = _pending_list.size();
-
-    if ((retval = libusb_handle_events_timeout(_ctx, &tv)) < 0) {
-        std::cerr << "error: libusb_handle_events: " << retval << std::endl;
-        return false;
-    }
-
-    if (_pending_list.size() < pending_list_size) {
-        return true;
-    }
-    else {
-        return false;
-    }
-}
-
-
-/*
- * Get a free transfer
- * The transfer has an empty data bufer for OUT requests 
- * \return pointer to a libusb_transfer
- */
-libusb_transfer *usb_endpoint::get_free_transfer()
-{
-    if (_free_list.empty()) {
-        if (!reap_completed_list())
-            return NULL; 
-    }
-
-    return free_list_get();
-}
-
-
-/*
- * Get a completed transfer 
- * The transfer has a full data buffer for IN requests
- * \return pointer to libusb_transfer
- */
-libusb_transfer *usb_endpoint::get_completed_transfer()
-{
-    if (_completed_list.empty()) {
-        if (!reap_pending_list_timeout())
-            return NULL; 
-    }
-
-    return completed_list_get();
-}
-
-/*
- * List operations 
- */
-void usb_endpoint::free_list_add(libusb_transfer *lut)
-{
-    _free_list.push_back(lut);
-}
-
-void usb_endpoint::pending_list_add(libusb_transfer *lut)
-{
-    _pending_list.push_back(lut);
-}
-
-void usb_endpoint::completed_list_add(libusb_transfer *lut)
-{
-    _completed_list.push_back(lut);
-}
-
-
-/*
- * Free and completed lists don't have ordered content 
- * Pop transfers from the front as needed
- */
-libusb_transfer *usb_endpoint::free_list_get()
-{
+libusb_transfer *usb_endpoint::get_lut_with_wait(size_t timeout_ms){
+    boost::this_thread::disable_interruption di; //disable because the wait can throw
     libusb_transfer *lut;
-
-    if (_free_list.size() == 0) {
-        return NULL; 
-    }
-    else { 
-        lut = _free_list.front();
-        _free_list.pop_front();
-        return lut;
-    }
-}
-
-
-/*
- * Free and completed lists don't have ordered content 
- * Pop transfers from the front as needed
- */
-libusb_transfer *usb_endpoint::completed_list_get()
-{
-    libusb_transfer *lut;
-
-    if (_completed_list.empty()) {
-        return NULL;
-    }
-    else { 
-        lut = _completed_list.front();
-        _completed_list.pop_front();
-        return lut;
-    }
+    if (_completed_list->pop_with_timed_wait(
+        lut, boost::posix_time::milliseconds(timeout_ms)
+    )) return lut;
+    return NULL;
 }
 
-
-/*
- * Search and remove transfer from pending list
- * Assuming that the callbacks occur in order, the front element
- * should yield the correct transfer. If not, then something else
- * is going on. If no transfers match, then something went wrong.
- */
-bool usb_endpoint::pending_list_remove(libusb_transfer *lut)
-{
-    std::list<libusb_transfer*>::iterator iter;
-    for (iter = _pending_list.begin(); iter != _pending_list.end(); iter++) {
-        if (*iter == lut) { 
-            _pending_list.erase(iter);
-            return true;
-        }
-    }
-    return false;
-}
-
-
 /***********************************************************************
  * Managed buffers 
  **********************************************************************/
@@ -518,17 +293,15 @@ bool usb_endpoint::pending_list_remove(libusb_transfer *lut)
 class libusb_managed_recv_buffer_impl : public managed_recv_buffer {
 public:
     libusb_managed_recv_buffer_impl(libusb_transfer *lut,
-                                    usb_endpoint *endpoint)
+                                    usb_endpoint::sptr endpoint)
         : _buff(lut->buffer, lut->length)
     {
         _lut = lut;
         _endpoint = endpoint;
     }
 
-    ~libusb_managed_recv_buffer_impl()
-    {
-       if (!_endpoint->submit(_lut))
-           std::cerr << "USB: failed to submit IN transfer" << std::endl;
+    ~libusb_managed_recv_buffer_impl(void){
+        _endpoint->submit(_lut);
     }
 
 private:
@@ -538,7 +311,7 @@ private:
     }
 
     libusb_transfer *_lut;
-    usb_endpoint *_endpoint;
+    usb_endpoint::sptr _endpoint;
     const boost::asio::const_buffer _buff;
 };
 
@@ -554,7 +327,7 @@ private:
 class libusb_managed_send_buffer_impl : public managed_send_buffer {
 public:
     libusb_managed_send_buffer_impl(libusb_transfer *lut,
-                                    usb_endpoint *endpoint,
+                                    usb_endpoint::sptr endpoint,
                                     size_t buff_size)
         : _buff(lut->buffer, buff_size), _committed(false)
     {
@@ -562,8 +335,7 @@ public:
         _endpoint = endpoint;
     }
 
-    ~libusb_managed_send_buffer_impl()
-    {
+    ~libusb_managed_send_buffer_impl(void){
         if (!_committed) {
             _lut->length = 0;
             _lut->actual_length = 0;
@@ -583,12 +355,14 @@ public:
         _lut->length = num_bytes;
         _lut->actual_length = 0;
 
-        if (_endpoint->submit(_lut)) {
+        try{
+            _endpoint->submit(_lut);
             _committed = true;
             return num_bytes;
         }
-        else {
-            return 0;
+        catch(const std::exception &e){
+            std::cerr << "Error in commit: " << e.what() << std::endl;
+            return -1;
         }
     }
 
@@ -599,7 +373,7 @@ private:
     }
 
     libusb_transfer *_lut;
-    usb_endpoint *_endpoint;
+    usb_endpoint::sptr _endpoint;
     const boost::asio::mutable_buffer _buff;
     bool _committed;
 };
@@ -611,14 +385,9 @@ private:
 class libusb_zero_copy_impl : public usb_zero_copy
 {
 private:
-    usb_endpoint          *_rx_ep;
-    usb_endpoint          *_tx_ep;
+    usb_endpoint::sptr _rx_ep, _tx_ep;
 
-    // Maintain libusb values
-    libusb_context       *_rx_ctx;
-    libusb_context       *_tx_ctx;
-    libusb_device_handle *_rx_dev_handle;
-    libusb_device_handle *_tx_dev_handle;
+    libusb::device_handle::sptr _handle;
 
     size_t _recv_buff_size;
     size_t _send_buff_size;
@@ -627,13 +396,11 @@ private:
 public:
     typedef boost::shared_ptr<libusb_zero_copy_impl> sptr;
 
-    libusb_zero_copy_impl(usb_device_handle::sptr handle,
+    libusb_zero_copy_impl(libusb::device_handle::sptr handle,
                           unsigned int rx_endpoint,
                           unsigned int tx_endpoint,
                           size_t recv_buff_size,
                           size_t send_buff_size);
-    
-    ~libusb_zero_copy_impl();
 
     managed_recv_buffer::sptr get_recv_buff(void);
     managed_send_buffer::sptr get_send_buff(void);
@@ -647,73 +414,43 @@ public:
  * Initializes libusb, opens devices, and sets up interfaces for I/O.
  * Finally, creates endpoints for asynchronous I/O. 
  */
-libusb_zero_copy_impl::libusb_zero_copy_impl(usb_device_handle::sptr handle,
+libusb_zero_copy_impl::libusb_zero_copy_impl(libusb::device_handle::sptr handle,
                                              unsigned int rx_endpoint,
                                              unsigned int tx_endpoint,
                                              size_t buff_size,
                                              size_t block_size)
- : _rx_ctx(NULL), _tx_ctx(NULL), _rx_dev_handle(NULL), _tx_dev_handle(NULL),
+ : _handle(handle),
    _recv_buff_size(block_size), _send_buff_size(block_size),
    _num_frames(buff_size / block_size)
 {
-    // Initialize libusb with separate contexts to allow
-    // thread safe operation of transmit and receive 
-    libusb::init(&_rx_ctx, libusb_debug_level);
-    libusb::init(&_tx_ctx, libusb_debug_level);
-
-    UHD_ASSERT_THROW((_rx_ctx != NULL) && (_tx_ctx != NULL));
-
-    // Find and open the libusb_device corresponding to the
-    // given handle and return the libusb_device_handle
-    // that can be used for I/O purposes.
-    _rx_dev_handle = libusb::open_device(_rx_ctx, handle);
-    _tx_dev_handle = libusb::open_device(_tx_ctx, handle);
-
-    // Open USB interfaces for tx/rx using magic values.
-    // IN interface:      2
-    // OUT interface:     1
-    // Control interface: 0
-    libusb::open_interface(_rx_dev_handle, 2);
-    libusb::open_interface(_tx_dev_handle, 1);
-
-    _rx_ep = new usb_endpoint(_rx_dev_handle,  // libusb device_handle
-                              _rx_ctx,         // libusb context
+    _handle->claim_interface(2 /*in interface*/);
+    _handle->claim_interface(1 /*out interface*/);
+
+    _rx_ep = usb_endpoint::sptr(new usb_endpoint(
+                              _handle,         // libusb device_handle
                               rx_endpoint,     // USB endpoint number
                               true,            // IN endpoint
                               _recv_buff_size, // buffer size per transfer 
-                              _num_frames);    // number of libusb transfers
+                              _num_frames      // number of libusb transfers
+    ));
 
-    _tx_ep = new usb_endpoint(_tx_dev_handle,  // libusb device_handle
-                              _tx_ctx,         // libusb context
+    _tx_ep = usb_endpoint::sptr(new usb_endpoint(
+                              _handle,         // libusb device_handle
                               tx_endpoint,     // USB endpoint number
                               false,           // OUT endpoint
                               _send_buff_size, // buffer size per transfer
-                              _num_frames);    // number of libusb transfers
+                              _num_frames      // number of libusb transfers
+    ));
 }
 
-
-libusb_zero_copy_impl::~libusb_zero_copy_impl()
-{
-    delete _rx_ep;
-    delete _tx_ep; 
-
-    libusb_close(_rx_dev_handle);
-    libusb_close(_tx_dev_handle);
-
-    libusb_exit(_rx_ctx);
-    libusb_exit(_tx_ctx);
-}
-
-
 /*
  * Construct a managed receive buffer from a completed libusb transfer
  * (happy with buffer full of data) obtained from the receive endpoint.
  * Return empty pointer if no transfer is available (timeout or error).
  * \return pointer to a managed receive buffer 
  */
-managed_recv_buffer::sptr libusb_zero_copy_impl::get_recv_buff()
-{
-    libusb_transfer *lut = _rx_ep->get_completed_transfer();
+managed_recv_buffer::sptr libusb_zero_copy_impl::get_recv_buff(void){
+    libusb_transfer *lut = _rx_ep->get_lut_with_wait(/* TODO timeout API */);
     if (lut == NULL) {
         return managed_recv_buffer::sptr();
     }
@@ -731,9 +468,8 @@ managed_recv_buffer::sptr libusb_zero_copy_impl::get_recv_buff()
  * (timeout or error).
  * \return pointer to a managed send buffer 
  */
-managed_send_buffer::sptr libusb_zero_copy_impl::get_send_buff()
-{
-    libusb_transfer *lut = _tx_ep->get_free_transfer();
+managed_send_buffer::sptr libusb_zero_copy_impl::get_send_buff(void){
+    libusb_transfer *lut = _tx_ep->get_lut_with_wait(/* TODO timeout API */);
     if (lut == NULL) {
         return managed_send_buffer::sptr();
     }
@@ -756,12 +492,12 @@ usb_zero_copy::sptr usb_zero_copy::make(usb_device_handle::sptr handle,
                                         size_t block_size)
 
 {
-    return sptr(new libusb_zero_copy_impl(handle,
+    libusb::device_handle::sptr dev_handle(libusb::device_handle::get_cached_handle(
+        boost::static_pointer_cast<libusb::special_handle>(handle)->get_device()
+    ));
+    return sptr(new libusb_zero_copy_impl(dev_handle,
                                           rx_endpoint,
                                           tx_endpoint,
                                           buff_size, 
                                           block_size));
 }
-
-
-
diff --git a/host/lib/transport/msvc/stdint.h b/host/lib/transport/msvc/stdint.h
new file mode 100644
index 000000000..b3eb61aae
--- /dev/null
+++ b/host/lib/transport/msvc/stdint.h
@@ -0,0 +1,35 @@
+//

+// 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/>.

+//

+

+#ifndef INCLUDED_LIBUHD_TRANSPORT_STDINT_H

+#define INCLUDED_LIBUHD_TRANSPORT_STDINT_H

+

+#include <boost/cstdint.hpp>

+

+//provide a stdint implementation for libusb

+

+typedef boost::uint64_t uint64_t;

+typedef boost::uint32_t uint32_t;

+typedef boost::uint16_t uint16_t;

+typedef boost::uint8_t uint8_t;

+

+typedef boost::int64_t int64_t;

+typedef boost::int32_t int32_t;

+typedef boost::int16_t int16_t;

+typedef boost::int8_t int8_t;

+

+#endif /* INCLUDED_LIBUHD_TRANSPORT_STDINT_H */

diff --git a/host/lib/transport/vrt_packet_handler.hpp b/host/lib/transport/vrt_packet_handler.hpp
index 7e0588f03..b603f1371 100644
--- a/host/lib/transport/vrt_packet_handler.hpp
+++ b/host/lib/transport/vrt_packet_handler.hpp
@@ -150,7 +150,8 @@ template <typename T> UHD_INLINE T get_context_code(
         const vrt_unpacker_t &vrt_unpacker,
         const get_recv_buffs_t &get_recv_buffs,
         const handle_overflow_t &handle_overflow,
-        size_t vrt_header_offset_words32
+        size_t vrt_header_offset_words32,
+        size_t chans_per_otw_buff
     ){
         metadata.error_code = uhd::rx_metadata_t::ERROR_CODE_NONE;
 
@@ -184,15 +185,21 @@ template <typename T> UHD_INLINE T get_context_code(
         //extract the number of samples available to copy
         size_t bytes_per_item = otw_type.get_sample_size();
         size_t nsamps_available = state.size_of_copy_buffs/bytes_per_item;
-        size_t nsamps_to_copy = std::min(total_samps, nsamps_available);
+        size_t nsamps_to_copy = std::min(total_samps*chans_per_otw_buff, nsamps_available);
         size_t bytes_to_copy = nsamps_to_copy*bytes_per_item;
+        size_t nsamps_to_copy_per_io_buff = nsamps_to_copy/chans_per_otw_buff;
+
+        std::vector<void *> io_buffs(chans_per_otw_buff);
+        for (size_t i = 0; i < state.width; i+=chans_per_otw_buff){
+
+            //fill a vector with pointers to the io buffers
+            for (size_t j = 0; j < chans_per_otw_buff; j++){
+                io_buffs[j] = reinterpret_cast<boost::uint8_t *>(buffs[i+j]) + offset_bytes;
+            }
 
-        for (size_t i = 0; i < state.width; i++){
             //copy-convert the samples from the recv buffer
             uhd::transport::convert_otw_type_to_io_type(
-                state.copy_buffs[i], otw_type,
-                reinterpret_cast<boost::uint8_t *>(buffs[i]) + offset_bytes,
-                io_type, nsamps_to_copy
+                state.copy_buffs[i], otw_type, io_buffs, io_type, nsamps_to_copy_per_io_buff
             );
 
             //update the rx copy buffer to reflect the bytes copied
@@ -206,7 +213,7 @@ template <typename T> UHD_INLINE T get_context_code(
         metadata.fragment_offset = state.fragment_offset_in_samps;
         state.fragment_offset_in_samps += nsamps_to_copy; //set for next call
 
-        return nsamps_to_copy;
+        return nsamps_to_copy_per_io_buff;
     }
 
     /*******************************************************************
@@ -224,7 +231,8 @@ template <typename T> UHD_INLINE T get_context_code(
         const vrt_unpacker_t &vrt_unpacker,
         const get_recv_buffs_t &get_recv_buffs,
         const handle_overflow_t &handle_overflow = &handle_overflow_nop,
-        size_t vrt_header_offset_words32 = 0
+        size_t vrt_header_offset_words32 = 0,
+        size_t chans_per_otw_buff = 1
     ){
         switch(recv_mode){
 
@@ -241,7 +249,8 @@ template <typename T> UHD_INLINE T get_context_code(
                 vrt_unpacker,
                 get_recv_buffs,
                 handle_overflow,
-                vrt_header_offset_words32
+                vrt_header_offset_words32,
+                chans_per_otw_buff
             );
         }
 
@@ -261,7 +270,8 @@ template <typename T> UHD_INLINE T get_context_code(
                     vrt_unpacker,
                     get_recv_buffs,
                     handle_overflow,
-                    vrt_header_offset_words32
+                    vrt_header_offset_words32,
+                    chans_per_otw_buff
                 );
                 if (num_samps == 0) break; //had a recv timeout or error, break loop
                 accum_num_samps += num_samps;
@@ -303,29 +313,32 @@ template <typename T> UHD_INLINE T get_context_code(
         const uhd::otw_type_t &otw_type,
         const vrt_packer_t &vrt_packer,
         const get_send_buffs_t &get_send_buffs,
-        size_t vrt_header_offset_words32
+        size_t vrt_header_offset_words32,
+        size_t chans_per_otw_buff
     ){
         //load the rest of the if_packet_info in here
-        if_packet_info.num_payload_words32 = (num_samps*otw_type.get_sample_size())/sizeof(boost::uint32_t);
+        if_packet_info.num_payload_words32 = (num_samps*chans_per_otw_buff*otw_type.get_sample_size())/sizeof(boost::uint32_t);
         if_packet_info.packet_count = state.next_packet_seq++;
 
         //get send buffers for each channel
-        managed_send_buffs_t send_buffs(buffs.size());
+        managed_send_buffs_t send_buffs(buffs.size()/chans_per_otw_buff);
         UHD_ASSERT_THROW(get_send_buffs(send_buffs));
 
-        for (size_t i = 0; i < buffs.size(); i++){
+        std::vector<const void *> io_buffs(chans_per_otw_buff);
+        for (size_t i = 0; i < buffs.size(); i+=chans_per_otw_buff){
             //calculate pointers with offsets to io and otw memory
-            const boost::uint8_t *io_mem = reinterpret_cast<const boost::uint8_t *>(buffs[i]) + offset_bytes;
+            for (size_t j = 0; j < chans_per_otw_buff; j++){
+                io_buffs[j] = reinterpret_cast<const boost::uint8_t *>(buffs[i+j]) + offset_bytes;
+            }
             boost::uint32_t *otw_mem = send_buffs[i]->cast<boost::uint32_t *>() + vrt_header_offset_words32;
 
             //pack metadata into a vrt header
             vrt_packer(otw_mem, if_packet_info);
+            otw_mem += if_packet_info.num_header_words32;
 
             //copy-convert the samples into the send buffer
             uhd::transport::convert_io_type_to_otw_type(
-                io_mem, io_type,
-                otw_mem + if_packet_info.num_header_words32, otw_type,
-                num_samps
+                io_buffs, io_type, otw_mem, otw_type, num_samps
             );
 
             //commit the samples to the zero-copy interface
@@ -351,7 +364,8 @@ template <typename T> UHD_INLINE T get_context_code(
         const vrt_packer_t &vrt_packer,
         const get_send_buffs_t &get_send_buffs,
         size_t max_samples_per_packet,
-        size_t vrt_header_offset_words32 = 0
+        size_t vrt_header_offset_words32 = 0,
+        size_t chans_per_otw_buff = 1
     ){
         //translate the metadata to vrt if packet info
         uhd::transport::vrt::if_packet_info_t if_packet_info;
@@ -383,7 +397,8 @@ template <typename T> UHD_INLINE T get_context_code(
                 io_type, otw_type,
                 vrt_packer,
                 get_send_buffs,
-                vrt_header_offset_words32
+                vrt_header_offset_words32,
+                chans_per_otw_buff
             );
             return num_samps;
         }
@@ -414,7 +429,8 @@ template <typename T> UHD_INLINE T get_context_code(
                     io_type, otw_type,
                     vrt_packer,
                     get_send_buffs,
-                    vrt_header_offset_words32
+                    vrt_header_offset_words32,
+                    chans_per_otw_buff
                 );
             }
             return total_num_samps;
diff --git a/host/lib/usrp/CMakeLists.txt b/host/lib/usrp/CMakeLists.txt
index b5c545988..69a190bfa 100644
--- a/host/lib/usrp/CMakeLists.txt
+++ b/host/lib/usrp/CMakeLists.txt
@@ -26,6 +26,7 @@ LIBUHD_APPEND_SOURCES(
     ${CMAKE_SOURCE_DIR}/lib/usrp/mimo_usrp.cpp
     ${CMAKE_SOURCE_DIR}/lib/usrp/misc_utils.cpp
     ${CMAKE_SOURCE_DIR}/lib/usrp/simple_usrp.cpp
+    ${CMAKE_SOURCE_DIR}/lib/usrp/single_usrp.cpp
     ${CMAKE_SOURCE_DIR}/lib/usrp/subdev_spec.cpp
     ${CMAKE_SOURCE_DIR}/lib/usrp/tune_helper.cpp
 )
diff --git a/host/lib/usrp/dboard/db_basic_and_lf.cpp b/host/lib/usrp/dboard/db_basic_and_lf.cpp
index 2a9bf2ca5..4b0d8bf27 100644
--- a/host/lib/usrp/dboard/db_basic_and_lf.cpp
+++ b/host/lib/usrp/dboard/db_basic_and_lf.cpp
@@ -59,6 +59,7 @@ private:
 
 static const uhd::dict<std::string, subdev_conn_t> sd_name_to_conn = map_list_of
     ("AB", SUBDEV_CONN_COMPLEX_IQ)
+    ("BA", SUBDEV_CONN_COMPLEX_QI)
     ("A",  SUBDEV_CONN_REAL_I)
     ("B",  SUBDEV_CONN_REAL_Q)
 ;
diff --git a/host/lib/usrp/dboard/db_wbx.cpp b/host/lib/usrp/dboard/db_wbx.cpp
index ccd897674..e473ce41e 100644
--- a/host/lib/usrp/dboard/db_wbx.cpp
+++ b/host/lib/usrp/dboard/db_wbx.cpp
@@ -154,7 +154,7 @@ static dboard_base::sptr make_wbx(dboard_base::ctor_args_t args){
 }
 
 UHD_STATIC_BLOCK(reg_wbx_dboards){
-    dboard_manager::register_dboard(0x0052, 0x0053, &make_wbx, "WBX");
+    dboard_manager::register_dboard(0x0053, 0x0052, &make_wbx, "WBX");
 }
 
 /***********************************************************************
diff --git a/host/lib/usrp/dboard_manager.cpp b/host/lib/usrp/dboard_manager.cpp
index ab80875f5..181f843a0 100644
--- a/host/lib/usrp/dboard_manager.cpp
+++ b/host/lib/usrp/dboard_manager.cpp
@@ -18,6 +18,7 @@
 #include "dboard_ctor_args.hpp"
 #include <uhd/usrp/dboard_manager.hpp>
 #include <uhd/usrp/subdev_props.hpp>
+#include <uhd/utils/warning.hpp>
 #include <uhd/utils/static.hpp>
 #include <uhd/utils/assert.hpp>
 #include <uhd/types/dict.hpp>
@@ -176,10 +177,6 @@ static args_t get_dboard_args(
 ){
     //special case, the none id was provided, use the following ids
     if (dboard_id == dboard_id_t::none() or force_to_unknown){
-        std::cerr << boost::format(
-            "Warning: unknown dboard-id or dboard-id combination: %s\n"
-            "    -> defaulting to the unknown board type"
-        ) % dboard_id.to_pp_string() << std::endl;
         UHD_ASSERT_THROW(get_id_to_args_map().has_key(0xfff1));
         UHD_ASSERT_THROW(get_id_to_args_map().has_key(0xfff0));
         switch(unit){
@@ -191,6 +188,9 @@ static args_t get_dboard_args(
 
     //verify that there is a registered constructor for this id
     if (not get_id_to_args_map().has_key(dboard_id)){
+        uhd::print_warning(str(boost::format(
+            "Unknown dboard ID: %s.\n"
+        ) % dboard_id.to_pp_string()));
         return get_dboard_args(unit, dboard_id, true);
     }
 
@@ -214,12 +214,25 @@ dboard_manager_impl::dboard_manager_impl(
         (get_xcvr_id_to_id_map()[tx_dboard_id] == rx_dboard_id)
     );
 
+    //warn for invalid dboard id xcvr combinations
+    if (rx_dboard_is_xcvr != this_dboard_is_xcvr or tx_dboard_is_xcvr != this_dboard_is_xcvr){
+        uhd::print_warning(str(boost::format(
+            "Unknown transceiver board ID combination...\n"
+            "RX dboard ID: %s\n"
+            "TX dboard ID: %s\n"
+        ) % rx_dboard_id.to_pp_string() % tx_dboard_id.to_pp_string()));
+    }
+
     //extract dboard constructor and settings (force to unknown for messed up xcvr status)
     dboard_ctor_t rx_dboard_ctor; std::string rx_name; prop_names_t rx_subdevs;
-    boost::tie(rx_dboard_ctor, rx_name, rx_subdevs) = get_dboard_args(dboard_iface::UNIT_RX, rx_dboard_id, rx_dboard_is_xcvr != this_dboard_is_xcvr);
+    boost::tie(rx_dboard_ctor, rx_name, rx_subdevs) = get_dboard_args(
+        dboard_iface::UNIT_RX, rx_dboard_id, rx_dboard_is_xcvr != this_dboard_is_xcvr
+    );
 
     dboard_ctor_t tx_dboard_ctor; std::string tx_name; prop_names_t tx_subdevs;
-    boost::tie(tx_dboard_ctor, tx_name, tx_subdevs) = get_dboard_args(dboard_iface::UNIT_TX, tx_dboard_id, tx_dboard_is_xcvr != this_dboard_is_xcvr);
+    boost::tie(tx_dboard_ctor, tx_name, tx_subdevs) = get_dboard_args(
+        dboard_iface::UNIT_TX, tx_dboard_id, tx_dboard_is_xcvr != this_dboard_is_xcvr
+    );
 
     //initialize the gpio pins before creating subdevs
     set_nice_dboard_if();
diff --git a/host/lib/usrp/mimo_usrp.cpp b/host/lib/usrp/mimo_usrp.cpp
index e78d38fc0..9331c7fbb 100644
--- a/host/lib/usrp/mimo_usrp.cpp
+++ b/host/lib/usrp/mimo_usrp.cpp
@@ -179,15 +179,15 @@ public:
     }
 
     tune_result_t set_rx_freq(size_t chan, double target_freq){
-        return tune_rx_subdev_and_dsp(_rx_subdev(chan), _rx_dsp(chan), target_freq);
+        return tune_rx_subdev_and_dsp(_rx_subdev(chan), _rx_dsp(chan), 0, target_freq);
     }
 
     tune_result_t set_rx_freq(size_t chan, double target_freq, double lo_off){
-        return tune_rx_subdev_and_dsp(_rx_subdev(chan), _rx_dsp(chan), target_freq, lo_off);
+        return tune_rx_subdev_and_dsp(_rx_subdev(chan), _rx_dsp(chan), 0, target_freq, lo_off);
     }
 
     double get_rx_freq(size_t chan){
-        return derive_freq_from_rx_subdev_and_dsp(_rx_subdev(chan), _rx_dsp(chan));
+        return derive_freq_from_rx_subdev_and_dsp(_rx_subdev(chan), _rx_dsp(chan), 0);
     }
 
     freq_range_t get_rx_freq_range(size_t chan){
@@ -255,15 +255,15 @@ public:
     }
 
     tune_result_t set_tx_freq(size_t chan, double target_freq){
-        return tune_tx_subdev_and_dsp(_tx_subdev(chan), _tx_dsp(chan), target_freq);
+        return tune_tx_subdev_and_dsp(_tx_subdev(chan), _tx_dsp(chan), 0, target_freq);
     }
 
     tune_result_t set_tx_freq(size_t chan, double target_freq, double lo_off){
-        return tune_tx_subdev_and_dsp(_tx_subdev(chan), _tx_dsp(chan), target_freq, lo_off);
+        return tune_tx_subdev_and_dsp(_tx_subdev(chan), _tx_dsp(chan), 0, target_freq, lo_off);
     }
 
     double get_tx_freq(size_t chan){
-        return derive_freq_from_tx_subdev_and_dsp(_tx_subdev(chan), _tx_dsp(chan));
+        return derive_freq_from_tx_subdev_and_dsp(_tx_subdev(chan), _tx_dsp(chan), 0);
     }
 
     freq_range_t get_tx_freq_range(size_t chan){
diff --git a/host/lib/usrp/simple_usrp.cpp b/host/lib/usrp/simple_usrp.cpp
index e573d0fc0..b89b76eed 100644
--- a/host/lib/usrp/simple_usrp.cpp
+++ b/host/lib/usrp/simple_usrp.cpp
@@ -15,35 +15,20 @@
 // along with this program.  If not, see <http://www.gnu.org/licenses/>.
 //
 
+#include <uhd/usrp/single_usrp.hpp>
 #include <uhd/usrp/simple_usrp.hpp>
-#include <uhd/usrp/tune_helper.hpp>
-#include <uhd/utils/assert.hpp>
-#include <uhd/utils/gain_group.hpp>
-#include <uhd/usrp/subdev_props.hpp>
-#include <uhd/usrp/mboard_props.hpp>
-#include <uhd/usrp/device_props.hpp>
-#include <uhd/usrp/dboard_props.hpp>
-#include <uhd/usrp/dsp_props.hpp>
-#include <boost/foreach.hpp>
-#include <boost/format.hpp>
-#include <stdexcept>
-#include <iostream>
+#include <uhd/utils/warning.hpp>
 
 using namespace uhd;
 using namespace uhd::usrp;
 
-static inline freq_range_t add_dsp_shift(const freq_range_t &range, wax::obj dsp){
-    double codec_rate = dsp[DSP_PROP_CODEC_RATE].as<double>();
-    return freq_range_t(range.min - codec_rate/2.0, range.max + codec_rate/2.0);
-}
-
 /***********************************************************************
  * Simple USRP Implementation
  **********************************************************************/
 class simple_usrp_impl : public simple_usrp{
 public:
     simple_usrp_impl(const device_addr_t &addr){
-        _dev = device::make(addr);
+        _sdev = single_usrp::make(addr);
     }
 
     ~simple_usrp_impl(void){
@@ -51,235 +36,187 @@ public:
     }
 
     device::sptr get_device(void){
-        return _dev;
+        return _sdev->get_device();
     }
 
     std::string get_pp_string(void){
-        return str(boost::format(
-            "Simple USRP:\n"
-            "  Device: %s\n"
-            "  Mboard: %s\n"
-            "  RX DSP: %s\n"
-            "  RX Dboard: %s\n"
-            "  RX Subdev: %s\n"
-            "  TX DSP: %s\n"
-            "  TX Dboard: %s\n"
-            "  TX Subdev: %s\n"
-        )
-            % (*_dev)[DEVICE_PROP_NAME].as<std::string>()
-            % _mboard()[MBOARD_PROP_NAME].as<std::string>()
-            % _rx_dsp()[DSP_PROP_NAME].as<std::string>()
-            % _rx_dboard()[DBOARD_PROP_NAME].as<std::string>()
-            % _rx_subdev()[SUBDEV_PROP_NAME].as<std::string>()
-            % _tx_dsp()[DSP_PROP_NAME].as<std::string>()
-            % _tx_dboard()[DBOARD_PROP_NAME].as<std::string>()
-            % _tx_subdev()[SUBDEV_PROP_NAME].as<std::string>()
-        );
+        return _sdev->get_pp_string();
     }
 
     /*******************************************************************
      * Misc
      ******************************************************************/
     time_spec_t get_time_now(void){
-        return _mboard()[MBOARD_PROP_TIME_NOW].as<time_spec_t>();
+        return _sdev->get_time_now();
     }
 
     void set_time_now(const time_spec_t &time_spec){
-        _mboard()[MBOARD_PROP_TIME_NOW] = time_spec;
+        return _sdev->set_time_now(time_spec);
     }
 
     void set_time_next_pps(const time_spec_t &time_spec){
-        _mboard()[MBOARD_PROP_TIME_NEXT_PPS] = time_spec;
+        return _sdev->set_time_next_pps(time_spec);
     }
 
     void issue_stream_cmd(const stream_cmd_t &stream_cmd){
-        _mboard()[MBOARD_PROP_STREAM_CMD] = stream_cmd;
+        return _sdev->issue_stream_cmd(stream_cmd);
     }
 
     void set_clock_config(const clock_config_t &clock_config){
-        _mboard()[MBOARD_PROP_CLOCK_CONFIG] = clock_config;
+        return _sdev->set_clock_config(clock_config);
     }
 
     /*******************************************************************
      * RX methods
      ******************************************************************/
     void set_rx_subdev_spec(const subdev_spec_t &spec){
-        _mboard()[MBOARD_PROP_RX_SUBDEV_SPEC] = spec;
-        std::cout << "RX " << _mboard()[MBOARD_PROP_RX_SUBDEV_SPEC].as<subdev_spec_t>().to_pp_string() << std::endl;
+        return _sdev->set_rx_subdev_spec(spec);
     }
 
     subdev_spec_t get_rx_subdev_spec(void){
-        return _mboard()[MBOARD_PROP_RX_SUBDEV_SPEC].as<subdev_spec_t>();
+        return _sdev->get_rx_subdev_spec();
     }
 
     void set_rx_rate(double rate){
-        _rx_dsp()[DSP_PROP_HOST_RATE] = rate;
+        return _sdev->set_rx_rate(rate);
     }
 
     double get_rx_rate(void){
-        return _rx_dsp()[DSP_PROP_HOST_RATE].as<double>();
+        return _sdev->get_rx_rate();
     }
 
     tune_result_t set_rx_freq(double target_freq){
-        return tune_rx_subdev_and_dsp(_rx_subdev(), _rx_dsp(), target_freq);
+        return _sdev->set_rx_freq(target_freq);
     }
 
     tune_result_t set_rx_freq(double target_freq, double lo_off){
-        return tune_rx_subdev_and_dsp(_rx_subdev(), _rx_dsp(), target_freq, lo_off);
+        return _sdev->set_rx_freq(target_freq, lo_off);
     }
 
     double get_rx_freq(void){
-        return derive_freq_from_rx_subdev_and_dsp(_rx_subdev(), _rx_dsp());
+        return _sdev->get_rx_freq();
     }
 
     freq_range_t get_rx_freq_range(void){
-        return add_dsp_shift(_rx_subdev()[SUBDEV_PROP_FREQ_RANGE].as<freq_range_t>(), _rx_dsp());
+        return _sdev->get_rx_freq_range();
     }
 
     void set_rx_gain(float gain){
-        return _rx_gain_group()->set_value(gain);
+        return _sdev->set_rx_gain(gain);
     }
 
     float get_rx_gain(void){
-        return _rx_gain_group()->get_value();
+        return _sdev->get_rx_gain();
     }
 
     gain_range_t get_rx_gain_range(void){
-        return _rx_gain_group()->get_range();
+        return _sdev->get_rx_gain_range();
     }
 
     void set_rx_antenna(const std::string &ant){
-        _rx_subdev()[SUBDEV_PROP_ANTENNA] = ant;
+        return _sdev->set_rx_antenna(ant);
     }
 
     std::string get_rx_antenna(void){
-        return _rx_subdev()[SUBDEV_PROP_ANTENNA].as<std::string>();
+        return _sdev->get_rx_antenna();
     }
 
     std::vector<std::string> get_rx_antennas(void){
-        return _rx_subdev()[SUBDEV_PROP_ANTENNA_NAMES].as<prop_names_t>();
+        return _sdev->get_rx_antennas();
     }
 
     bool get_rx_lo_locked(void){
-        return _rx_subdev()[SUBDEV_PROP_LO_LOCKED].as<bool>();
+        return _sdev->get_rx_lo_locked();
     }
 
     float read_rssi(void){
-        return _rx_subdev()[SUBDEV_PROP_RSSI].as<float>();
+        return _sdev->read_rssi();
     }
 
     dboard_iface::sptr get_rx_dboard_iface(void){
-        return _rx_dboard()[DBOARD_PROP_DBOARD_IFACE].as<dboard_iface::sptr>();
+        return _sdev->get_rx_dboard_iface();
     }
 
     /*******************************************************************
      * TX methods
      ******************************************************************/
     void set_tx_subdev_spec(const subdev_spec_t &spec){
-        _mboard()[MBOARD_PROP_TX_SUBDEV_SPEC] = spec;
-        std::cout << "TX " << _mboard()[MBOARD_PROP_TX_SUBDEV_SPEC].as<subdev_spec_t>().to_pp_string() << std::endl;
+        return _sdev->set_tx_subdev_spec(spec);
     }
 
     subdev_spec_t get_tx_subdev_spec(void){
-        return _mboard()[MBOARD_PROP_TX_SUBDEV_SPEC].as<subdev_spec_t>();
+        return _sdev->get_tx_subdev_spec();
     }
 
     void set_tx_rate(double rate){
-        _tx_dsp()[DSP_PROP_HOST_RATE] = rate;
+        return _sdev->set_tx_rate(rate);
     }
 
     double get_tx_rate(void){
-        return _tx_dsp()[DSP_PROP_HOST_RATE].as<double>();
+        return _sdev->get_tx_rate();
     }
 
     tune_result_t set_tx_freq(double target_freq){
-        return tune_tx_subdev_and_dsp(_tx_subdev(), _tx_dsp(), target_freq);
+        return _sdev->set_tx_freq(target_freq);
     }
 
     tune_result_t set_tx_freq(double target_freq, double lo_off){
-        return tune_tx_subdev_and_dsp(_tx_subdev(), _tx_dsp(), target_freq, lo_off);
+        return _sdev->set_tx_freq(target_freq, lo_off);
     }
 
     double get_tx_freq(void){
-        return derive_freq_from_tx_subdev_and_dsp(_tx_subdev(), _tx_dsp());
+        return _sdev->get_tx_freq();
     }
 
     freq_range_t get_tx_freq_range(void){
-        return add_dsp_shift(_tx_subdev()[SUBDEV_PROP_FREQ_RANGE].as<freq_range_t>(), _tx_dsp());
+        return _sdev->get_tx_freq_range();
     }
 
     void set_tx_gain(float gain){
-        return _tx_gain_group()->set_value(gain);
+        return _sdev->set_tx_gain(gain);
     }
 
     float get_tx_gain(void){
-        return _tx_gain_group()->get_value();
+        return _sdev->get_tx_gain();
     }
 
     gain_range_t get_tx_gain_range(void){
-        return _tx_gain_group()->get_range();
+        return _sdev->get_tx_gain_range();
     }
 
     void set_tx_antenna(const std::string &ant){
-        _tx_subdev()[SUBDEV_PROP_ANTENNA] = ant;
+        return _sdev->set_tx_antenna(ant);
     }
 
     std::string get_tx_antenna(void){
-        return _tx_subdev()[SUBDEV_PROP_ANTENNA].as<std::string>();
+        return _sdev->get_tx_antenna();
     }
 
     std::vector<std::string> get_tx_antennas(void){
-        return _tx_subdev()[SUBDEV_PROP_ANTENNA_NAMES].as<prop_names_t>();
+        return _sdev->get_tx_antennas();
     }
 
     bool get_tx_lo_locked(void){
-        return _tx_subdev()[SUBDEV_PROP_LO_LOCKED].as<bool>();
+        return _sdev->get_tx_lo_locked();
     }
 
     dboard_iface::sptr get_tx_dboard_iface(void){
-        return _tx_dboard()[DBOARD_PROP_DBOARD_IFACE].as<dboard_iface::sptr>();
+        return _sdev->get_tx_dboard_iface();
     }
 
 private:
-    device::sptr _dev;
-    wax::obj _mboard(void){
-        return (*_dev)[DEVICE_PROP_MBOARD];
-    }
-    wax::obj _rx_dsp(void){
-        return _mboard()[MBOARD_PROP_RX_DSP];
-    }
-    wax::obj _tx_dsp(void){
-        return _mboard()[MBOARD_PROP_TX_DSP];
-    }
-    wax::obj _rx_dboard(void){
-        std::string db_name = _mboard()[MBOARD_PROP_RX_SUBDEV_SPEC].as<subdev_spec_t>().front().db_name;
-        return _mboard()[named_prop_t(MBOARD_PROP_RX_DBOARD, db_name)];
-    }
-    wax::obj _tx_dboard(void){
-        std::string db_name = _mboard()[MBOARD_PROP_TX_SUBDEV_SPEC].as<subdev_spec_t>().front().db_name;
-        return _mboard()[named_prop_t(MBOARD_PROP_TX_DBOARD, db_name)];
-    }
-    wax::obj _rx_subdev(void){
-        std::string sd_name = _mboard()[MBOARD_PROP_RX_SUBDEV_SPEC].as<subdev_spec_t>().front().sd_name;
-        return _rx_dboard()[named_prop_t(DBOARD_PROP_SUBDEV, sd_name)];
-    }
-    wax::obj _tx_subdev(void){
-        std::string sd_name = _mboard()[MBOARD_PROP_TX_SUBDEV_SPEC].as<subdev_spec_t>().front().sd_name;
-        return _tx_dboard()[named_prop_t(DBOARD_PROP_SUBDEV, sd_name)];
-    }
-    gain_group::sptr _rx_gain_group(void){
-        std::string sd_name = _mboard()[MBOARD_PROP_RX_SUBDEV_SPEC].as<subdev_spec_t>().front().sd_name;
-        return _rx_dboard()[named_prop_t(DBOARD_PROP_GAIN_GROUP, sd_name)].as<gain_group::sptr>();
-    }
-    gain_group::sptr _tx_gain_group(void){
-        std::string sd_name = _mboard()[MBOARD_PROP_TX_SUBDEV_SPEC].as<subdev_spec_t>().front().sd_name;
-        return _tx_dboard()[named_prop_t(DBOARD_PROP_GAIN_GROUP, sd_name)].as<gain_group::sptr>();
-    }
+    single_usrp::sptr _sdev;
 };
 
 /***********************************************************************
  * The Make Function
  **********************************************************************/
 simple_usrp::sptr simple_usrp::make(const device_addr_t &dev_addr){
+    uhd::print_warning(
+        "The simple USRP interface has been deprecated.\n"
+        "Please switch to the single USRP interface.\n"
+        "#include <uhd/usrp/single_usrp.hpp>\n"
+        "single_usrp::sptr sdev = single_usrp::make(args);\n"
+    );
     return sptr(new simple_usrp_impl(dev_addr));
 }
diff --git a/host/lib/usrp/single_usrp.cpp b/host/lib/usrp/single_usrp.cpp
new file mode 100644
index 000000000..bb4af44b8
--- /dev/null
+++ b/host/lib/usrp/single_usrp.cpp
@@ -0,0 +1,307 @@
+//
+// 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/>.
+//
+
+#include <uhd/usrp/single_usrp.hpp>
+#include <uhd/usrp/tune_helper.hpp>
+#include <uhd/utils/assert.hpp>
+#include <uhd/utils/gain_group.hpp>
+#include <uhd/usrp/subdev_props.hpp>
+#include <uhd/usrp/mboard_props.hpp>
+#include <uhd/usrp/device_props.hpp>
+#include <uhd/usrp/dboard_props.hpp>
+#include <uhd/usrp/dsp_props.hpp>
+#include <boost/foreach.hpp>
+#include <boost/format.hpp>
+#include <stdexcept>
+#include <iostream>
+
+using namespace uhd;
+using namespace uhd::usrp;
+
+static inline freq_range_t add_dsp_shift(const freq_range_t &range, wax::obj dsp){
+    double codec_rate = dsp[DSP_PROP_CODEC_RATE].as<double>();
+    return freq_range_t(range.min - codec_rate/2.0, range.max + codec_rate/2.0);
+}
+
+/***********************************************************************
+ * Simple USRP Implementation
+ **********************************************************************/
+class single_usrp_impl : public single_usrp{
+public:
+    single_usrp_impl(const device_addr_t &addr){
+        _dev = device::make(addr);
+    }
+
+    ~single_usrp_impl(void){
+        /* NOP */
+    }
+
+    device::sptr get_device(void){
+        return _dev;
+    }
+
+    std::string get_pp_string(void){
+        std::string buff = str(boost::format(
+            "Single USRP:\n"
+            "  Device: %s\n"
+            "  Mboard: %s\n"
+        )
+            % (*_dev)[DEVICE_PROP_NAME].as<std::string>()
+            % _mboard()[MBOARD_PROP_NAME].as<std::string>()
+        );
+
+        //----------- rx side of life ----------------------------------
+        buff += str(boost::format(
+            "  RX DSP: %s\n"
+        )
+            % _rx_dsp()[DSP_PROP_NAME].as<std::string>()
+        );
+        for (size_t chan = 0; chan < this->get_rx_subdev_spec().size(); chan++){
+            buff += str(boost::format(
+                "  RX Channel: %u\n"
+                "    RX Dboard: %s\n"
+                "    RX Subdev: %s\n"
+            ) % chan
+                % _rx_dboard(chan)[DBOARD_PROP_NAME].as<std::string>()
+                % _rx_subdev(chan)[SUBDEV_PROP_NAME].as<std::string>()
+            );
+        }
+
+        //----------- tx side of life ----------------------------------
+        buff += str(boost::format(
+            "  TX DSP: %s\n"
+        )
+            % _tx_dsp()[DSP_PROP_NAME].as<std::string>()
+        );
+        for (size_t chan = 0; chan < this->get_tx_subdev_spec().size(); chan++){
+            buff += str(boost::format(
+                "  TX Channel: %u\n"
+                "    TX Dboard: %s\n"
+                "    TX Subdev: %s\n"
+            ) % chan
+                % _tx_dboard(chan)[DBOARD_PROP_NAME].as<std::string>()
+                % _tx_subdev(chan)[SUBDEV_PROP_NAME].as<std::string>()
+            );
+        }
+
+        return buff;
+    }
+
+    /*******************************************************************
+     * Misc
+     ******************************************************************/
+    time_spec_t get_time_now(void){
+        return _mboard()[MBOARD_PROP_TIME_NOW].as<time_spec_t>();
+    }
+
+    void set_time_now(const time_spec_t &time_spec){
+        _mboard()[MBOARD_PROP_TIME_NOW] = time_spec;
+    }
+
+    void set_time_next_pps(const time_spec_t &time_spec){
+        _mboard()[MBOARD_PROP_TIME_NEXT_PPS] = time_spec;
+    }
+
+    void issue_stream_cmd(const stream_cmd_t &stream_cmd){
+        _mboard()[MBOARD_PROP_STREAM_CMD] = stream_cmd;
+    }
+
+    void set_clock_config(const clock_config_t &clock_config){
+        _mboard()[MBOARD_PROP_CLOCK_CONFIG] = clock_config;
+    }
+
+    /*******************************************************************
+     * RX methods
+     ******************************************************************/
+    void set_rx_subdev_spec(const subdev_spec_t &spec){
+        _mboard()[MBOARD_PROP_RX_SUBDEV_SPEC] = spec;
+    }
+
+    subdev_spec_t get_rx_subdev_spec(void){
+        return _mboard()[MBOARD_PROP_RX_SUBDEV_SPEC].as<subdev_spec_t>();
+    }
+
+    void set_rx_rate(double rate){
+        _rx_dsp()[DSP_PROP_HOST_RATE] = rate;
+    }
+
+    double get_rx_rate(void){
+        return _rx_dsp()[DSP_PROP_HOST_RATE].as<double>();
+    }
+
+    tune_result_t set_rx_freq(double target_freq, size_t chan){
+        return tune_rx_subdev_and_dsp(_rx_subdev(chan), _rx_dsp(), chan, target_freq);
+    }
+
+    tune_result_t set_rx_freq(double target_freq, double lo_off, size_t chan){
+        return tune_rx_subdev_and_dsp(_rx_subdev(chan), _rx_dsp(), chan, target_freq, lo_off);
+    }
+
+    double get_rx_freq(size_t chan){
+        return derive_freq_from_rx_subdev_and_dsp(_rx_subdev(chan), _rx_dsp(), chan);
+    }
+
+    freq_range_t get_rx_freq_range(size_t chan){
+        return add_dsp_shift(_rx_subdev(chan)[SUBDEV_PROP_FREQ_RANGE].as<freq_range_t>(), _rx_dsp());
+    }
+
+    void set_rx_gain(float gain, size_t chan){
+        return _rx_gain_group(chan)->set_value(gain);
+    }
+
+    float get_rx_gain(size_t chan){
+        return _rx_gain_group(chan)->get_value();
+    }
+
+    gain_range_t get_rx_gain_range(size_t chan){
+        return _rx_gain_group(chan)->get_range();
+    }
+
+    void set_rx_antenna(const std::string &ant, size_t chan){
+        _rx_subdev(chan)[SUBDEV_PROP_ANTENNA] = ant;
+    }
+
+    std::string get_rx_antenna(size_t chan){
+        return _rx_subdev(chan)[SUBDEV_PROP_ANTENNA].as<std::string>();
+    }
+
+    std::vector<std::string> get_rx_antennas(size_t chan){
+        return _rx_subdev(chan)[SUBDEV_PROP_ANTENNA_NAMES].as<prop_names_t>();
+    }
+
+    bool get_rx_lo_locked(size_t chan){
+        return _rx_subdev(chan)[SUBDEV_PROP_LO_LOCKED].as<bool>();
+    }
+
+    float read_rssi(size_t chan){
+        return _rx_subdev(chan)[SUBDEV_PROP_RSSI].as<float>();
+    }
+
+    dboard_iface::sptr get_rx_dboard_iface(size_t chan){
+        return _rx_dboard(chan)[DBOARD_PROP_DBOARD_IFACE].as<dboard_iface::sptr>();
+    }
+
+    /*******************************************************************
+     * TX methods
+     ******************************************************************/
+    void set_tx_subdev_spec(const subdev_spec_t &spec){
+        _mboard()[MBOARD_PROP_TX_SUBDEV_SPEC] = spec;
+    }
+
+    subdev_spec_t get_tx_subdev_spec(void){
+        return _mboard()[MBOARD_PROP_TX_SUBDEV_SPEC].as<subdev_spec_t>();
+    }
+
+    void set_tx_rate(double rate){
+        _tx_dsp()[DSP_PROP_HOST_RATE] = rate;
+    }
+
+    double get_tx_rate(void){
+        return _tx_dsp()[DSP_PROP_HOST_RATE].as<double>();
+    }
+
+    tune_result_t set_tx_freq(double target_freq, size_t chan){
+        return tune_tx_subdev_and_dsp(_tx_subdev(chan), _tx_dsp(), chan, target_freq);
+    }
+
+    tune_result_t set_tx_freq(double target_freq, double lo_off, size_t chan){
+        return tune_tx_subdev_and_dsp(_tx_subdev(chan), _tx_dsp(), chan, target_freq, lo_off);
+    }
+
+    double get_tx_freq(size_t chan){
+        return derive_freq_from_tx_subdev_and_dsp(_tx_subdev(chan), _tx_dsp(), chan);
+    }
+
+    freq_range_t get_tx_freq_range(size_t chan){
+        return add_dsp_shift(_tx_subdev(chan)[SUBDEV_PROP_FREQ_RANGE].as<freq_range_t>(), _tx_dsp());
+    }
+
+    void set_tx_gain(float gain, size_t chan){
+        return _tx_gain_group(chan)->set_value(gain);
+    }
+
+    float get_tx_gain(size_t chan){
+        return _tx_gain_group(chan)->get_value();
+    }
+
+    gain_range_t get_tx_gain_range(size_t chan){
+        return _tx_gain_group(chan)->get_range();
+    }
+
+    void set_tx_antenna(const std::string &ant, size_t chan){
+        _tx_subdev(chan)[SUBDEV_PROP_ANTENNA] = ant;
+    }
+
+    std::string get_tx_antenna(size_t chan){
+        return _tx_subdev(chan)[SUBDEV_PROP_ANTENNA].as<std::string>();
+    }
+
+    std::vector<std::string> get_tx_antennas(size_t chan){
+        return _tx_subdev(chan)[SUBDEV_PROP_ANTENNA_NAMES].as<prop_names_t>();
+    }
+
+    bool get_tx_lo_locked(size_t chan){
+        return _tx_subdev(chan)[SUBDEV_PROP_LO_LOCKED].as<bool>();
+    }
+
+    dboard_iface::sptr get_tx_dboard_iface(size_t chan){
+        return _tx_dboard(chan)[DBOARD_PROP_DBOARD_IFACE].as<dboard_iface::sptr>();
+    }
+
+private:
+    device::sptr _dev;
+    wax::obj _mboard(void){
+        return (*_dev)[DEVICE_PROP_MBOARD];
+    }
+    wax::obj _rx_dsp(void){
+        return _mboard()[MBOARD_PROP_RX_DSP];
+    }
+    wax::obj _tx_dsp(void){
+        return _mboard()[MBOARD_PROP_TX_DSP];
+    }
+    wax::obj _rx_dboard(size_t chan){
+        std::string db_name = this->get_rx_subdev_spec().at(chan).db_name;
+        return _mboard()[named_prop_t(MBOARD_PROP_RX_DBOARD, db_name)];
+    }
+    wax::obj _tx_dboard(size_t chan){
+        std::string db_name = this->get_tx_subdev_spec().at(chan).db_name;
+        return _mboard()[named_prop_t(MBOARD_PROP_TX_DBOARD, db_name)];
+    }
+    wax::obj _rx_subdev(size_t chan){
+        std::string sd_name = this->get_rx_subdev_spec().at(chan).sd_name;
+        return _rx_dboard(chan)[named_prop_t(DBOARD_PROP_SUBDEV, sd_name)];
+    }
+    wax::obj _tx_subdev(size_t chan){
+        std::string sd_name = this->get_tx_subdev_spec().at(chan).sd_name;
+        return _tx_dboard(chan)[named_prop_t(DBOARD_PROP_SUBDEV, sd_name)];
+    }
+    gain_group::sptr _rx_gain_group(size_t chan){
+        std::string sd_name = this->get_rx_subdev_spec().at(chan).sd_name;
+        return _rx_dboard(chan)[named_prop_t(DBOARD_PROP_GAIN_GROUP, sd_name)].as<gain_group::sptr>();
+    }
+    gain_group::sptr _tx_gain_group(size_t chan){
+        std::string sd_name = this->get_tx_subdev_spec().at(chan).sd_name;
+        return _tx_dboard(chan)[named_prop_t(DBOARD_PROP_GAIN_GROUP, sd_name)].as<gain_group::sptr>();
+    }
+};
+
+/***********************************************************************
+ * The Make Function
+ **********************************************************************/
+single_usrp::sptr single_usrp::make(const device_addr_t &dev_addr){
+    return sptr(new single_usrp_impl(dev_addr));
+}
diff --git a/host/lib/usrp/tune_helper.cpp b/host/lib/usrp/tune_helper.cpp
index e516477d3..7633c67f2 100644
--- a/host/lib/usrp/tune_helper.cpp
+++ b/host/lib/usrp/tune_helper.cpp
@@ -30,11 +30,12 @@ using namespace uhd::usrp;
  **********************************************************************/
 static tune_result_t tune_xx_subdev_and_dxc(
     dboard_iface::unit_t unit,
-    wax::obj subdev, wax::obj dxc,
+    wax::obj subdev, wax::obj dxc, size_t chan,
     double target_freq, double lo_offset
 ){
     wax::obj subdev_freq_proxy = subdev[SUBDEV_PROP_FREQ];
-    wax::obj dxc_freq_proxy = dxc[DSP_PROP_FREQ_SHIFT];
+    std::string freq_name = dxc[DSP_PROP_FREQ_SHIFT_NAMES].as<prop_names_t>().at(chan);
+    wax::obj dxc_freq_proxy = dxc[named_prop_t(DSP_PROP_FREQ_SHIFT, freq_name)];
     double dxc_sample_rate = dxc[DSP_PROP_CODEC_RATE].as<double>();
 
     // Ask the d'board to tune as closely as it can to target_freq+lo_offset
@@ -65,11 +66,12 @@ static tune_result_t tune_xx_subdev_and_dxc(
 
 static double derive_freq_from_xx_subdev_and_dxc(
     dboard_iface::unit_t unit,
-    wax::obj subdev, wax::obj dxc
+    wax::obj subdev, wax::obj dxc, size_t chan
 ){
     //extract actual dsp and IF frequencies
     double actual_inter_freq = subdev[SUBDEV_PROP_FREQ].as<double>();
-    double actual_dxc_freq = dxc[DSP_PROP_FREQ_SHIFT].as<double>();
+    std::string freq_name = dxc[DSP_PROP_FREQ_SHIFT_NAMES].as<prop_names_t>().at(chan);
+    double actual_dxc_freq = dxc[named_prop_t(DSP_PROP_FREQ_SHIFT, freq_name)].as<double>();
 
     //invert the sign on the dxc freq given the following conditions
     if (unit == dboard_iface::UNIT_TX) actual_dxc_freq *= -1.0;
@@ -81,50 +83,54 @@ static double derive_freq_from_xx_subdev_and_dxc(
  * RX Tune
  **********************************************************************/
 tune_result_t usrp::tune_rx_subdev_and_dsp(
-    wax::obj subdev, wax::obj ddc,
+    wax::obj subdev, wax::obj ddc, size_t chan,
     double target_freq, double lo_offset
 ){
-    return tune_xx_subdev_and_dxc(dboard_iface::UNIT_RX, subdev, ddc, target_freq, lo_offset);
+    return tune_xx_subdev_and_dxc(dboard_iface::UNIT_RX, subdev, ddc, chan, target_freq, lo_offset);
 }
 
 tune_result_t usrp::tune_rx_subdev_and_dsp(
     wax::obj subdev, wax::obj ddc,
-    double target_freq
+    size_t chan, double target_freq
 ){
     double lo_offset = 0.0;
     //if the local oscillator will be in the passband, use an offset
     if (subdev[SUBDEV_PROP_USE_LO_OFFSET].as<bool>()){
         lo_offset = 2.0*ddc[DSP_PROP_HOST_RATE].as<double>();
     }
-    return tune_rx_subdev_and_dsp(subdev, ddc, target_freq, lo_offset);
+    return tune_rx_subdev_and_dsp(subdev, ddc, chan, target_freq, lo_offset);
 }
 
-double usrp::derive_freq_from_rx_subdev_and_dsp(wax::obj subdev, wax::obj ddc){
-    return derive_freq_from_xx_subdev_and_dxc(dboard_iface::UNIT_RX, subdev, ddc);
+double usrp::derive_freq_from_rx_subdev_and_dsp(
+    wax::obj subdev, wax::obj ddc, size_t chan
+){
+    return derive_freq_from_xx_subdev_and_dxc(dboard_iface::UNIT_RX, subdev, ddc, chan);
 }
 
 /***********************************************************************
  * TX Tune
  **********************************************************************/
 tune_result_t usrp::tune_tx_subdev_and_dsp(
-    wax::obj subdev, wax::obj duc,
+    wax::obj subdev, wax::obj duc, size_t chan,
     double target_freq, double lo_offset
 ){
-    return tune_xx_subdev_and_dxc(dboard_iface::UNIT_TX, subdev, duc, target_freq, lo_offset);
+    return tune_xx_subdev_and_dxc(dboard_iface::UNIT_TX, subdev, duc, chan, target_freq, lo_offset);
 }
 
 tune_result_t usrp::tune_tx_subdev_and_dsp(
     wax::obj subdev, wax::obj duc,
-    double target_freq
+    size_t chan, double target_freq
 ){
     double lo_offset = 0.0;
     //if the local oscillator will be in the passband, use an offset
     if (subdev[SUBDEV_PROP_USE_LO_OFFSET].as<bool>()){
         lo_offset = 2.0*duc[DSP_PROP_HOST_RATE].as<double>();
     }
-    return tune_tx_subdev_and_dsp(subdev, duc, target_freq, lo_offset);
+    return tune_tx_subdev_and_dsp(subdev, duc, chan, target_freq, lo_offset);
 }
 
-double usrp::derive_freq_from_tx_subdev_and_dsp(wax::obj subdev, wax::obj duc){
-    return derive_freq_from_xx_subdev_and_dxc(dboard_iface::UNIT_TX, subdev, duc);
+double usrp::derive_freq_from_tx_subdev_and_dsp(
+    wax::obj subdev, wax::obj duc, size_t chan
+){
+    return derive_freq_from_xx_subdev_and_dxc(dboard_iface::UNIT_TX, subdev, duc, chan);
 }
diff --git a/host/lib/usrp/usrp1/codec_ctrl.cpp b/host/lib/usrp/usrp1/codec_ctrl.cpp
index 3ab02eeeb..33b18b196 100644
--- a/host/lib/usrp/usrp1/codec_ctrl.cpp
+++ b/host/lib/usrp/usrp1/codec_ctrl.cpp
@@ -129,7 +129,7 @@ usrp1_codec_ctrl_impl::usrp1_codec_ctrl_impl(usrp1_iface::sptr iface,
     _ad9862_regs.clkout2_div_factor = ad9862_regs_t::CLKOUT2_DIV_FACTOR_2;
 
     //write the register settings to the codec
-    for (uint8_t addr = 0; addr <= 25; addr++) {
+    for (boost::uint8_t addr = 0; addr <= 25; addr++) {
         this->send_reg(addr);
     }
 
@@ -202,7 +202,7 @@ float usrp1_codec_ctrl_impl::get_rx_pga_gain(char which){
  **********************************************************************/
 static float aux_adc_to_volts(boost::uint8_t high, boost::uint8_t low)
 {
-    return float((boost::uint16_t(high) << 2) | low)*3.3/0x3ff;
+    return float(((boost::uint16_t(high) << 2) | low)*3.3)/0x3ff;
 }
 
 float usrp1_codec_ctrl_impl::read_aux_adc(aux_adc_t which)
diff --git a/host/lib/usrp/usrp1/dsp_impl.cpp b/host/lib/usrp/usrp1/dsp_impl.cpp
index d5a88fa2d..e9a5e60a6 100644
--- a/host/lib/usrp/usrp1/dsp_impl.cpp
+++ b/host/lib/usrp/usrp1/dsp_impl.cpp
@@ -21,6 +21,8 @@
 #include <uhd/usrp/dsp_props.hpp>
 #include <boost/bind.hpp>
 #include <boost/format.hpp>
+#include <boost/lexical_cast.hpp>
+#include <boost/assign/list_of.hpp>
 #include <iostream>
 #include <cmath>
 
@@ -42,11 +44,15 @@ void usrp1_impl::rx_dsp_init(void)
 /***********************************************************************
  * RX DDC Get
  **********************************************************************/
-void usrp1_impl::rx_dsp_get(const wax::obj &key, wax::obj &val)
-{
+void usrp1_impl::rx_dsp_get(const wax::obj &key_, wax::obj &val){
+    named_prop_t key = named_prop_t::extract(key_);
+
     switch(key.as<dsp_prop_t>()){
     case DSP_PROP_NAME:
-        val = std::string("usrp1 ddc0");
+        val = str(boost::format("usrp1 ddc %uX %s")
+            % this->get_num_ddcs()
+            % (this->has_rx_halfband()? "+ hb" : "")
+        );
         return;
 
     case DSP_PROP_OTHERS:
@@ -54,7 +60,16 @@ void usrp1_impl::rx_dsp_get(const wax::obj &key, wax::obj &val)
         return;
 
     case DSP_PROP_FREQ_SHIFT:
-        val = _rx_dsp_freq;
+        val = _rx_dsp_freqs[key.name];
+        return;
+
+    case DSP_PROP_FREQ_SHIFT_NAMES:{
+            prop_names_t names;
+            for(size_t i = 0; i < this->get_num_ddcs(); i++){
+                names.push_back(boost::lexical_cast<std::string>(i));
+            }
+            val = names;
+        }
         return;
 
     case DSP_PROP_CODEC_RATE:
@@ -73,30 +88,26 @@ void usrp1_impl::rx_dsp_get(const wax::obj &key, wax::obj &val)
 /***********************************************************************
  * RX DDC Set
  **********************************************************************/
-void usrp1_impl::rx_dsp_set(const wax::obj &key, const wax::obj &val)
-{
+void usrp1_impl::rx_dsp_set(const wax::obj &key_, const wax::obj &val){
+    named_prop_t key = named_prop_t::extract(key_);
+
     switch(key.as<dsp_prop_t>()) {
     case DSP_PROP_FREQ_SHIFT: {
             double new_freq = val.as<double>();
             boost::uint32_t reg_word = dsp_type1::calc_cordic_word_and_update(
                 new_freq, _clock_ctrl->get_master_clock_freq());
 
-            //TODO TODO TODO TODO TODO TODO TODO TODO TODO 
-            //
-            // Handle multiple receive channels / DDC's
-            //
-            //TODO TODO TODO TODO TODO TODO TODO TODO TODO
-            _iface->poke32(FR_RX_FREQ_0, reg_word);
-            _iface->poke32(FR_RX_FREQ_1, reg_word);
-            _iface->poke32(FR_RX_FREQ_2, reg_word);
-            _iface->poke32(FR_RX_FREQ_3, reg_word);
-
-            _rx_dsp_freq = new_freq;
+            static const uhd::dict<std::string, boost::uint32_t>
+            freq_name_to_reg_val = boost::assign::map_list_of
+                ("0", FR_RX_FREQ_0) ("1", FR_RX_FREQ_1)
+                ("2", FR_RX_FREQ_2) ("3", FR_RX_FREQ_3)
+            ;
+            _iface->poke32(freq_name_to_reg_val[key.name], reg_word);
+            _rx_dsp_freqs[key.name] = new_freq;
             return;
         }
     case DSP_PROP_HOST_RATE: {
-            unsigned int rate =
-                    _clock_ctrl->get_master_clock_freq() / val.as<double>();
+            size_t rate = size_t(_clock_ctrl->get_master_clock_freq() / val.as<double>());
 
             if ((rate & 0x01) || (rate < 4) || (rate > 256)) {
                 std::cerr << "Decimation must be even and between 4 and 256"
@@ -106,7 +117,7 @@ void usrp1_impl::rx_dsp_set(const wax::obj &key, const wax::obj &val)
 
             _rx_dsp_decim = rate;
             //TODO Poll every 100ms. Make it selectable?
-            _rx_samps_per_poll_interval = 0.1 * _clock_ctrl->get_master_clock_freq() / rate;
+            _rx_samps_per_poll_interval = size_t(0.1 * _clock_ctrl->get_master_clock_freq() / rate);
 
             _iface->poke32(FR_DECIM_RATE, _rx_dsp_decim/2 - 1);
         }
@@ -133,11 +144,15 @@ void usrp1_impl::tx_dsp_init(void)
 /***********************************************************************
  * TX DUC Get
  **********************************************************************/
-void usrp1_impl::tx_dsp_get(const wax::obj &key, wax::obj &val)
-{
+void usrp1_impl::tx_dsp_get(const wax::obj &key_, wax::obj &val){
+    named_prop_t key = named_prop_t::extract(key_);
+
     switch(key.as<dsp_prop_t>()) {
     case DSP_PROP_NAME:
-        val = std::string("usrp1 duc0");
+        val = str(boost::format("usrp1 duc %uX %s")
+            % this->get_num_ducs()
+            % (this->has_tx_halfband()? "+ hb" : "")
+        );
         return;
 
     case DSP_PROP_OTHERS:
@@ -145,7 +160,16 @@ void usrp1_impl::tx_dsp_get(const wax::obj &key, wax::obj &val)
         return;
 
     case DSP_PROP_FREQ_SHIFT:
-        val = _tx_dsp_freq;
+        val = _tx_dsp_freqs[key.name];
+        return;
+
+    case DSP_PROP_FREQ_SHIFT_NAMES:{
+            prop_names_t names;
+            for(size_t i = 0; i < this->get_num_ducs(); i++){
+                names.push_back(boost::lexical_cast<std::string>(i));
+            }
+            val = names;
+        }
         return;
 
     case DSP_PROP_CODEC_RATE:
@@ -164,26 +188,25 @@ void usrp1_impl::tx_dsp_get(const wax::obj &key, wax::obj &val)
 /***********************************************************************
  * TX DUC Set
  **********************************************************************/
-void usrp1_impl::tx_dsp_set(const wax::obj &key, const wax::obj &val)
-{
+void usrp1_impl::tx_dsp_set(const wax::obj &key_, const wax::obj &val){
+    named_prop_t key = named_prop_t::extract(key_);
+
     switch(key.as<dsp_prop_t>()) {
 
-    //TODO TODO TODO TODO TODO TODO TODO TODO TODO TODO TODO TODO
-    //
-    // Set both codec frequencies until we have duality properties 
-    //
-    //TODO TODO TODO TODO TODO TODO TODO TODO TODO TODO TODO TODO
     case DSP_PROP_FREQ_SHIFT: {
             double new_freq = val.as<double>();
-            _codec_ctrls[DBOARD_SLOT_A]->set_duc_freq(new_freq);
-            _codec_ctrls[DBOARD_SLOT_B]->set_duc_freq(new_freq);
-            _tx_dsp_freq = new_freq;
+
+            //map the freq shift key to a subdev spec to a particular codec chip
+            std::string db_name = _tx_subdev_spec.at(boost::lexical_cast<size_t>(key.name)).db_name;
+            if (db_name == "A") _codec_ctrls[DBOARD_SLOT_A]->set_duc_freq(new_freq);
+            if (db_name == "B") _codec_ctrls[DBOARD_SLOT_B]->set_duc_freq(new_freq);
+
+            _tx_dsp_freqs[key.name] = new_freq;
             return;
         }
 
     case DSP_PROP_HOST_RATE: {
-            unsigned int rate =
-                    _clock_ctrl->get_master_clock_freq() * 2 / val.as<double>();
+            size_t rate = size_t(_clock_ctrl->get_master_clock_freq() * 2 / val.as<double>());
 
             if ((rate & 0x01) || (rate < 8) || (rate > 512)) {
                 std::cerr << "Interpolation rate must be even and between 8 and 512"
@@ -194,7 +217,7 @@ void usrp1_impl::tx_dsp_set(const wax::obj &key, const wax::obj &val)
             _tx_dsp_interp = rate;
 
             //TODO Poll every 100ms. Make it selectable? 
-            _tx_samps_per_poll_interval = 0.1 * _clock_ctrl->get_master_clock_freq() * 2 / rate;
+            _tx_samps_per_poll_interval = size_t(0.1 * _clock_ctrl->get_master_clock_freq() * 2 / rate);
 
             _iface->poke32(FR_INTERP_RATE, _tx_dsp_interp / 4 - 1);
             return;
diff --git a/host/lib/usrp/usrp1/io_impl.cpp b/host/lib/usrp/usrp1/io_impl.cpp
index 92e8bc20a..73974f2d6 100644
--- a/host/lib/usrp/usrp1/io_impl.cpp
+++ b/host/lib/usrp/usrp1/io_impl.cpp
@@ -33,294 +33,283 @@ using namespace uhd::usrp;
 using namespace uhd::transport;
 namespace asio = boost::asio;
 
-struct usrp1_send_state {
-    uhd::transport::managed_send_buffer::sptr send_buff;
-    size_t bytes_written;
-    size_t underrun_poll_samp_count;
-
-    size_t bytes_free()
+/***********************************************************************
+ * Pseudo send buffer implementation
+ **********************************************************************/
+class pseudo_managed_send_buffer : public managed_send_buffer{
+public:
+
+    pseudo_managed_send_buffer(
+        const boost::asio::mutable_buffer &buff,
+        const boost::function<ssize_t(size_t)> &commit
+    ):
+        _buff(buff),
+        _commit(commit)
     {
-        if (send_buff != NULL)
-            return send_buff->size() - bytes_written;
-        else
-            return 0;
+        /* NOP */
     }
-};
 
-struct usrp1_recv_state {
-    uhd::transport::managed_recv_buffer::sptr recv_buff;
-    size_t bytes_read;
-    size_t overrun_poll_samp_count;
+    ssize_t commit(size_t num_bytes){
+        return _commit(num_bytes);
+    }
 
-    size_t bytes_avail()
-    {
-        if (recv_buff != NULL)
-            return recv_buff->size() - bytes_read;
-        else
-            return 0;
+private:
+    const boost::asio::mutable_buffer &get(void) const{
+        return _buff;
     }
-};
 
-/***********************************************************************
- * IO Implementation Details
- **********************************************************************/
-struct usrp1_impl::io_impl {
-    io_impl();
-    ~io_impl(void);
-
-    //state handling for buffer management 
-    usrp1_recv_state recv_state;
-    usrp1_send_state send_state;
-
-    //send transport management 
-    bool get_send_buffer(zero_copy_if::sptr zc_if);
-    size_t copy_convert_send_samps(const void *buff, size_t num_samps,
-                              size_t sample_offset, const io_type_t io_type,
-                              otw_type_t otw_type);
-    bool conditional_buff_commit(bool force);
-    bool check_underrun(usrp_ctrl::sptr ctrl_if,
-                        size_t poll_interval, bool force);
-
-    //recv transport management 
-    bool get_recv_buffer(zero_copy_if::sptr zc_if);
-    size_t copy_convert_recv_samps(void *buff, size_t num_samps,
-                              size_t sample_offset, const io_type_t io_type,
-                              otw_type_t otw_type);
-    bool check_overrun(usrp_ctrl::sptr ctrl_if,
-                        size_t poll_interval, bool force);
+    const boost::asio::mutable_buffer      _buff;
+    const boost::function<ssize_t(size_t)> _commit;
 };
 
-usrp1_impl::io_impl::io_impl()
-{
-    send_state.send_buff = uhd::transport::managed_send_buffer::sptr();
-    recv_state.recv_buff = uhd::transport::managed_recv_buffer::sptr();
-}
-
-usrp1_impl::io_impl::~io_impl(void)
-{
-   /* NOP */
-}
-
-void usrp1_impl::io_init(void)
-{
-    _rx_otw_type.width = 16;
-    _rx_otw_type.shift = 0;
-    _rx_otw_type.byteorder = otw_type_t::BO_LITTLE_ENDIAN;
-
-    _tx_otw_type.width = 16;
-    _tx_otw_type.shift = 0;
-    _tx_otw_type.byteorder = otw_type_t::BO_LITTLE_ENDIAN;
-
-    _io_impl = UHD_PIMPL_MAKE(io_impl, ());
-}
-
 /***********************************************************************
- * Data Send
+ * IO Implementation Details
  **********************************************************************/
-bool usrp1_impl::io_impl::get_send_buffer(zero_copy_if::sptr zc_if)
-{
-    if (send_state.send_buff == NULL) {
+struct usrp1_impl::io_impl{
+    io_impl(zero_copy_if::sptr data_transport):
+        data_transport(data_transport),
+        underflow_poll_samp_count(0),
+        overflow_poll_samp_count(0),
+        send_buff(data_transport->get_send_buff()),
+        num_bytes_committed(0)
+    {
+        /* NOP */
+    }
 
-        send_state.send_buff = zc_if->get_send_buff();
-        if (send_state.send_buff == NULL)
-            return false;
+    ~io_impl(void){
+        flush_send_buff();
+    }
 
-        send_state.bytes_written = 0;
+    zero_copy_if::sptr data_transport;
+
+    //state management for the vrt packet handler code
+    vrt_packet_handler::recv_state packet_handler_recv_state;
+    vrt_packet_handler::send_state packet_handler_send_state;
+
+    //state management for overflow and underflow
+    size_t underflow_poll_samp_count;
+    size_t overflow_poll_samp_count;
+
+    //wrapper around the actual send buffer interface
+    //all of this to ensure only full buffers are committed
+    managed_send_buffer::sptr send_buff;
+    size_t num_bytes_committed;
+    boost::uint8_t pseudo_buff[BYTES_PER_PACKET];
+    ssize_t phony_commit_pseudo_buff(size_t num_bytes);
+    ssize_t phony_commit_send_buff(size_t num_bytes);
+    ssize_t commit_send_buff(void);
+    void flush_send_buff(void);
+    bool get_send_buffs(vrt_packet_handler::managed_send_buffs_t &);
+
+    //helpers to get at the send buffer + offset
+    inline void *get_send_mem_ptr(void){
+        return send_buff->cast<boost::uint8_t *>() + num_bytes_committed;
+    }
+    inline size_t get_send_mem_size(void){
+        return send_buff->size() - num_bytes_committed;
     }
+};
 
-    return true;
+/*!
+ * Accept a commit of num bytes to the pseudo buffer.
+ * Memcpy the entire contents of pseudo buffer into send buffers.
+ *
+ * Under most conditions:
+ *   The first loop iteration will fill the remainder of the send buffer.
+ *   The second loop iteration will empty the pseudo buffer remainder.
+ */
+ssize_t usrp1_impl::io_impl::phony_commit_pseudo_buff(size_t num_bytes){
+    size_t bytes_to_copy = num_bytes, bytes_copied = 0;
+    while(bytes_to_copy){
+        size_t bytes_copied_here = std::min(bytes_to_copy, get_send_mem_size());
+        std::memcpy(get_send_mem_ptr(), pseudo_buff + bytes_copied, bytes_copied_here);
+        ssize_t ret = phony_commit_send_buff(bytes_copied_here);
+        if (ret < 0) return ret;
+        bytes_to_copy -= ret;
+        bytes_copied += ret;
+    }
+    return bytes_copied;
 }
 
-size_t usrp1_impl::io_impl::copy_convert_send_samps(const void *buff,
-                                                    size_t num_samps,
-                                                    size_t sample_offset,
-                                                    const io_type_t io_type,
-                                                    otw_type_t otw_type)
-{
-    UHD_ASSERT_THROW(send_state.bytes_free() % otw_type.get_sample_size() == 0);
-
-    size_t samps_free = send_state.bytes_free() / otw_type.get_sample_size();
-    size_t copy_samps = std::min(num_samps - sample_offset, samps_free); 
-
-    const boost::uint8_t *io_mem =
-        reinterpret_cast<const boost::uint8_t *>(buff);
-
-    boost::uint8_t *otw_mem = send_state.send_buff->cast<boost::uint8_t *>();
-
-    convert_io_type_to_otw_type(io_mem + sample_offset * io_type.size,
-                                io_type,
-                                otw_mem + send_state.bytes_written,
-                                otw_type,
-                                copy_samps);
-
-    send_state.bytes_written += copy_samps * otw_type.get_sample_size();
-    send_state.underrun_poll_samp_count += copy_samps;
-
-    return copy_samps;
+/*!
+ * Accept a commit of num bytes to the send buffer.
+ * Conditionally commit the send buffer if full.
+ */
+ssize_t usrp1_impl::io_impl::phony_commit_send_buff(size_t num_bytes){
+    num_bytes_committed += num_bytes;
+    if (num_bytes_committed != send_buff->size()) return num_bytes;
+    ssize_t ret = commit_send_buff();
+    return (ret < 0)? ret : num_bytes;
 }
 
-bool usrp1_impl::io_impl::conditional_buff_commit(bool force)
-{
-    if (send_state.bytes_written % 512)
-        return false;
-
-    if (force || send_state.bytes_free() == 0) {
-        send_state.send_buff->commit(send_state.bytes_written);
-        send_state.send_buff = uhd::transport::managed_send_buffer::sptr();
-        return true;
-    }
-    
-    return false;
+/*!
+ * Flush the send buffer:
+ * Zero-pad the send buffer to the nearest 512 byte boundary and commit.
+ */
+void usrp1_impl::io_impl::flush_send_buff(void){
+    size_t bytes_to_pad = (-1*num_bytes_committed)%512;
+    std::memset(get_send_mem_ptr(), 0, bytes_to_pad);
+    num_bytes_committed += bytes_to_pad;
+    commit_send_buff();
 }
 
-bool usrp1_impl::io_impl::check_underrun(usrp_ctrl::sptr ctrl_if,
-                                         size_t poll_interval,
-                                         bool force)
-{
-    unsigned char underrun = 0;
-
-    bool ready_to_poll = send_state.underrun_poll_samp_count > poll_interval;
-
-    if (force || ready_to_poll) {
-        int ret = ctrl_if->usrp_control_read(VRQ_GET_STATUS,
-                                             0,
-                                             GS_TX_UNDERRUN,
-                                             &underrun, sizeof(char));
-        if (ret < 0)
-            std::cerr << "USRP: underrun check failed" << std::endl;
-        if (underrun)
-            std::cerr << "U" << std::flush;
-
-        send_state.underrun_poll_samp_count = 0;
-    }
-
-    return (bool) underrun;
+/*!
+ * Perform an actual commit on the send buffer:
+ * Commit the contents of the send buffer and request a new buffer.
+ */
+ssize_t usrp1_impl::io_impl::commit_send_buff(void){
+    ssize_t ret = send_buff->commit(num_bytes_committed);
+    send_buff = data_transport->get_send_buff();
+    num_bytes_committed = 0;
+    return ret;
 }
 
-size_t usrp1_impl::send(const std::vector<const void *> &buffs,
-                        size_t num_samps,
-                        const tx_metadata_t &,
-                        const io_type_t &io_type,
-                        send_mode_t)
-{
+bool usrp1_impl::io_impl::get_send_buffs(
+    vrt_packet_handler::managed_send_buffs_t &buffs
+){
     UHD_ASSERT_THROW(buffs.size() == 1);
 
-    size_t total_samps_sent = 0;
-
-    while (total_samps_sent < num_samps) {
-        if (!_io_impl->get_send_buffer(_data_transport))
-            return 0;
-
-        total_samps_sent += _io_impl->copy_convert_send_samps(buffs[0],
-                                                              num_samps,
-                                                              total_samps_sent,
-                                                              io_type,
-                                                              _tx_otw_type);
-        if (total_samps_sent == num_samps)
-            _io_impl->conditional_buff_commit(true);
-        else
-            _io_impl->conditional_buff_commit(false);
-
-        _io_impl->check_underrun(_ctrl_transport,
-                                 _tx_samps_per_poll_interval, false);
+    //not enough bytes free -> use the pseudo buffer
+    if (get_send_mem_size() < BYTES_PER_PACKET){
+        buffs[0] = managed_send_buffer::sptr(new pseudo_managed_send_buffer(
+            boost::asio::buffer(pseudo_buff),
+            boost::bind(&usrp1_impl::io_impl::phony_commit_pseudo_buff, this, _1)
+        ));
+    }
+    //otherwise use the send buffer offset by the bytes written
+    else{
+        buffs[0] = managed_send_buffer::sptr(new pseudo_managed_send_buffer(
+            boost::asio::buffer(get_send_mem_ptr(), get_send_mem_size()),
+            boost::bind(&usrp1_impl::io_impl::phony_commit_send_buff, this, _1)
+        ));
     }
 
-    return total_samps_sent;
+    return buffs[0].get() != NULL;
 }
 
 /***********************************************************************
- * Data Recv
+ * Initialize internals within this file
  **********************************************************************/
-bool usrp1_impl::io_impl::get_recv_buffer(zero_copy_if::sptr zc_if)
-{
-    if ((recv_state.recv_buff == NULL) || (recv_state.bytes_avail() == 0)) {
-
-        recv_state.recv_buff = zc_if->get_recv_buff();
-        if (recv_state.recv_buff == NULL)
-            return false;
+void usrp1_impl::io_init(void){
+    _rx_otw_type.width = 16;
+    _rx_otw_type.shift = 0;
+    _rx_otw_type.byteorder = otw_type_t::BO_LITTLE_ENDIAN;
 
-        recv_state.bytes_read = 0;
-    }
+    _tx_otw_type.width = 16;
+    _tx_otw_type.shift = 0;
+    _tx_otw_type.byteorder = otw_type_t::BO_LITTLE_ENDIAN;
 
-    return true;
+    _io_impl = UHD_PIMPL_MAKE(io_impl, (_data_transport));
 }
 
-size_t usrp1_impl::io_impl::copy_convert_recv_samps(void *buff,
-                                                    size_t num_samps,
-                                                    size_t sample_offset,
-                                                    const io_type_t io_type,
-                                                    otw_type_t otw_type)
-{
-    UHD_ASSERT_THROW(recv_state.bytes_avail() % otw_type.get_sample_size() == 0);
-
-    size_t samps_avail = recv_state.bytes_avail() / otw_type.get_sample_size();
-    size_t copy_samps = std::min(num_samps - sample_offset, samps_avail); 
-
-    const boost::uint8_t *otw_mem =
-        recv_state.recv_buff->cast<const boost::uint8_t *>();
-
-    boost::uint8_t *io_mem = reinterpret_cast<boost::uint8_t *>(buff);
-
-    convert_otw_type_to_io_type(otw_mem + recv_state.bytes_read,
-                                otw_type,
-                                io_mem + sample_offset * io_type.size,
-                                io_type,
-                                copy_samps);
-
-    recv_state.bytes_read += copy_samps * otw_type.get_sample_size();
-    recv_state.overrun_poll_samp_count += copy_samps;
-
-    return copy_samps;
+/***********************************************************************
+ * Data send + helper functions
+ **********************************************************************/
+static void usrp1_bs_vrt_packer(
+    boost::uint32_t *,
+    vrt::if_packet_info_t &if_packet_info
+){
+    if_packet_info.num_header_words32 = 0;
+    if_packet_info.num_packet_words32 = if_packet_info.num_payload_words32;
 }
 
-bool usrp1_impl::io_impl::check_overrun(usrp_ctrl::sptr ctrl_if,
-                                        size_t poll_interval,
-                                        bool force)
-{
-    unsigned char overrun = 0;
-
-    bool ready_to_poll = recv_state.overrun_poll_samp_count > poll_interval;
-
-    if (force || ready_to_poll) {
-        int ret = ctrl_if->usrp_control_read(VRQ_GET_STATUS,
-                                             0,
-                                             GS_RX_OVERRUN,
-                                             &overrun, sizeof(char));
-        if (ret < 0)
-            std::cerr << "USRP: overrrun check failed" << std::endl;
-        if (overrun)
-            std::cerr << "O" << std::flush;
-
-        recv_state.overrun_poll_samp_count = 0;
+size_t usrp1_impl::send(
+    const std::vector<const void *> &buffs, size_t num_samps,
+    const tx_metadata_t &metadata, const io_type_t &io_type,
+    send_mode_t send_mode
+){
+    size_t num_samps_sent = vrt_packet_handler::send(
+        _io_impl->packet_handler_send_state,       //last state of the send handler
+        buffs, num_samps,                          //buffer to fill
+        metadata, send_mode,                       //samples metadata
+        io_type, _tx_otw_type,                     //input and output types to convert
+        _clock_ctrl->get_master_clock_freq(),      //master clock tick rate
+        &usrp1_bs_vrt_packer,
+        boost::bind(&usrp1_impl::io_impl::get_send_buffs, _io_impl.get(), _1),
+        get_max_send_samps_per_packet(),
+        0,                                         //vrt header offset
+        _tx_subdev_spec.size()                     //num channels
+    );
+
+    //Don't honor sob because it is normal to be always bursting...
+    //handle eob flag (commit the buffer)
+    if (metadata.end_of_burst) _io_impl->flush_send_buff();
+
+    //handle the polling for underflow conditions
+    _io_impl->underflow_poll_samp_count += num_samps_sent;
+    if (_io_impl->underflow_poll_samp_count >= _tx_samps_per_poll_interval){
+        _io_impl->underflow_poll_samp_count = 0; //reset count
+        boost::uint8_t underflow = 0;
+        ssize_t ret = _ctrl_transport->usrp_control_read(
+            VRQ_GET_STATUS, 0, GS_TX_UNDERRUN,
+            &underflow, sizeof(underflow)
+        );
+        if (ret < 0)        std::cerr << "USRP: underflow check failed" << std::endl;
+        else if (underflow) std::cerr << "U" << std::flush;
     }
 
-    return (bool) overrun;
+    return num_samps_sent;
 }
 
-size_t usrp1_impl::recv(const std::vector<void *> &buffs,
-                        size_t num_samps,
-                        rx_metadata_t &,
-                        const io_type_t &io_type,
-                        recv_mode_t,
-                        size_t)
-{
-    UHD_ASSERT_THROW(buffs.size() == 1);
-
-    size_t total_samps_recv = 0;
-
-    while (total_samps_recv < num_samps) {
+/***********************************************************************
+ * Data recv + helper functions
+ **********************************************************************/
+static void usrp1_bs_vrt_unpacker(
+    const boost::uint32_t *,
+    vrt::if_packet_info_t &if_packet_info
+){
+    if_packet_info.packet_type = vrt::if_packet_info_t::PACKET_TYPE_DATA;
+    if_packet_info.num_payload_words32 = if_packet_info.num_packet_words32;
+    if_packet_info.num_header_words32 = 0;
+    if_packet_info.packet_count = 0;
+    if_packet_info.sob = false;
+    if_packet_info.eob = false;
+    if_packet_info.has_sid = false;
+    if_packet_info.has_cid = false;
+    if_packet_info.has_tsi = false;
+    if_packet_info.has_tsf = false;
+    if_packet_info.has_tlr = false;
+}
 
-        if (!_io_impl->get_recv_buffer(_data_transport))
-            return 0;
+static bool get_recv_buffs(
+    zero_copy_if::sptr zc_if,
+    vrt_packet_handler::managed_recv_buffs_t &buffs
+){
+    UHD_ASSERT_THROW(buffs.size() == 1);
+    buffs[0] = zc_if->get_recv_buff();
+    return buffs[0].get() != NULL;
+}
 
-        total_samps_recv += _io_impl->copy_convert_recv_samps(buffs[0],
-                                                              num_samps,
-                                                              total_samps_recv,
-                                                              io_type,
-                                                              _rx_otw_type);
-        _io_impl->check_overrun(_ctrl_transport,
-                                _rx_samps_per_poll_interval, false);
+size_t usrp1_impl::recv(
+    const std::vector<void *> &buffs, size_t num_samps,
+    rx_metadata_t &metadata, const io_type_t &io_type,
+    recv_mode_t recv_mode, size_t /*timeout_ms TODO*/
+){
+    size_t num_samps_recvd = vrt_packet_handler::recv(
+        _io_impl->packet_handler_recv_state,       //last state of the recv handler
+        buffs, num_samps,                          //buffer to fill
+        metadata, recv_mode,                       //samples metadata
+        io_type, _rx_otw_type,                     //input and output types to convert
+        _clock_ctrl->get_master_clock_freq(),      //master clock tick rate
+        &usrp1_bs_vrt_unpacker,
+        boost::bind(&get_recv_buffs, _data_transport, _1),
+        &vrt_packet_handler::handle_overflow_nop,
+        0,                                         //vrt header offset
+        _rx_subdev_spec.size()                     //num channels
+    );
+
+    //handle the polling for overflow conditions
+    _io_impl->overflow_poll_samp_count += num_samps_recvd;
+    if (_io_impl->overflow_poll_samp_count >= _rx_samps_per_poll_interval){
+        _io_impl->overflow_poll_samp_count = 0; //reset count
+        boost::uint8_t overflow = 0;
+        ssize_t ret = _ctrl_transport->usrp_control_read(
+            VRQ_GET_STATUS, 0, GS_RX_OVERRUN,
+            &overflow, sizeof(overflow)
+        );
+        if (ret < 0)       std::cerr << "USRP: overflow check failed" << std::endl;
+        else if (overflow) std::cerr << "O" << std::flush;
     }
 
-    return total_samps_recv; 
+    return num_samps_recvd;
 }
diff --git a/host/lib/usrp/usrp1/mboard_impl.cpp b/host/lib/usrp/usrp1/mboard_impl.cpp
index a90532cb8..fe3774eb4 100644
--- a/host/lib/usrp/usrp1/mboard_impl.cpp
+++ b/host/lib/usrp/usrp1/mboard_impl.cpp
@@ -36,6 +36,8 @@
 using namespace uhd;
 using namespace uhd::usrp;
 
+static const bool usrp1_mboard_verbose = false;
+
 /***********************************************************************
  * Calculate the RX mux value:
  *    The I and Q mux values are intentionally reversed to flip I and Q
@@ -146,6 +148,7 @@ static boost::uint32_t calc_tx_mux(
 
     //calculate the channel flags
     int channel_flags = 0, chan = 0;
+    uhd::dict<std::string, int> slot_to_chan_count = boost::assign::map_list_of("A", 0)("B", 0);
     BOOST_FOREACH(const subdev_spec_pair_t &pair, subdev_spec){
         wax::obj dboard = mboard[named_prop_t(MBOARD_PROP_TX_DBOARD, pair.db_name)];
         wax::obj subdev = dboard[named_prop_t(DBOARD_PROP_SUBDEV, pair.sd_name)];
@@ -155,6 +158,14 @@ static boost::uint32_t calc_tx_mux(
         if (pair.db_name == "A") channel_flags |= chan_to_conn_to_flag[chan][conn] << 0;
         if (pair.db_name == "B") channel_flags |= chan_to_conn_to_flag[chan][conn] << 8;
 
+        //sanity check, only 1 channel per slot
+        slot_to_chan_count[pair.db_name]++;
+        if (slot_to_chan_count[pair.db_name] > 1){
+            throw std::runtime_error(str(boost::format(
+                "dboard slot %s assigned to multiple channels in subdev spec %s"
+            ) % pair.db_name % subdev_spec.to_string()));
+        }
+
         //increment for the next channel
         chan++;
     }
@@ -172,23 +183,23 @@ static boost::uint32_t calc_tx_mux(
  * |               Reserved                        |T|DUCs |R|DDCs |
  * +-----------------------------------------------+-+-----+-+-----+
  */
-static int num_ddcs(boost::uint32_t regval)
-{
+size_t usrp1_impl::get_num_ddcs(void){
+    boost::uint32_t regval = _iface->peek32(FR_RB_CAPS);
     return (regval >> 0) & 0x0007;
 }
 
-static int num_ducs(boost::uint32_t regval)
-{
+size_t usrp1_impl::get_num_ducs(void){
+    boost::uint32_t regval = _iface->peek32(FR_RB_CAPS);
     return (regval >> 4) & 0x0007;
 }
 
-static bool has_rx_halfband(boost::uint32_t regval)
-{
+bool usrp1_impl::has_rx_halfband(void){
+    boost::uint32_t regval = _iface->peek32(FR_RB_CAPS);
     return (regval >> 3) & 0x0001;
 }
 
-static bool has_tx_halfband(boost::uint32_t regval)
-{
+bool usrp1_impl::has_tx_halfband(void){
+    boost::uint32_t regval = _iface->peek32(FR_RB_CAPS);
     return (regval >> 7) & 0x0001;
 }
 
@@ -220,26 +231,25 @@ void usrp1_impl::mboard_init(void)
     // Set default for TX format to 16-bit I&Q
     _iface->poke32(FR_TX_FORMAT, 0x00000000);
 
-    // TODO TODO TODO TODO TODO TODO TODO TODO TODO TODO 
-    // 
-    // Do something useful with the capabilities register
-    //
-    boost::uint32_t regval = _iface->peek32(FR_RB_CAPS);
-    std::cout << "USRP1 Capabilities" << std::endl;
-    std::cout << "    number of duc's: " << num_ddcs(regval) << std::endl;
-    std::cout << "    number of ddc's: " << num_ducs(regval) << std::endl;
-    std::cout << "    rx halfband:     " << has_rx_halfband(regval) << std::endl;
-    std::cout << "    tx halfband:     " << has_tx_halfband(regval) << std::endl;
+    if (usrp1_mboard_verbose){
+        std::cout << "USRP1 Capabilities" << std::endl;
+        std::cout << "    number of duc's: " << get_num_ddcs() << std::endl;
+        std::cout << "    number of ddc's: " << get_num_ducs() << std::endl;
+        std::cout << "    rx halfband:     " << has_rx_halfband() << std::endl;
+        std::cout << "    tx halfband:     " << has_tx_halfband() << std::endl;
+    }
 }
 
 void usrp1_impl::issue_stream_cmd(const stream_cmd_t &stream_cmd)
 {
-    if (stream_cmd.stream_mode == stream_cmd_t::STREAM_MODE_START_CONTINUOUS) {
-        _iface->write_firmware_cmd(VRQ_FPGA_SET_RX_ENABLE, true, 0, 0, 0);
-    }
+    switch(stream_cmd.stream_mode){
+    case stream_cmd_t::STREAM_MODE_START_CONTINUOUS:
+        return _iface->write_firmware_cmd(VRQ_FPGA_SET_RX_ENABLE, true, 0, 0, 0);
+
+    case stream_cmd_t::STREAM_MODE_STOP_CONTINUOUS:
+        return _iface->write_firmware_cmd(VRQ_FPGA_SET_RX_ENABLE, false, 0, 0, 0);
 
-    if (stream_cmd.stream_mode == stream_cmd_t::STREAM_MODE_STOP_CONTINUOUS) {
-        _iface->write_firmware_cmd(VRQ_FPGA_SET_RX_ENABLE, false, 0, 0, 0);
+    default: throw std::runtime_error("unsupported stream command type for USRP1");
     }
 }
 
@@ -269,7 +279,7 @@ void usrp1_impl::mboard_get(const wax::obj &key_, wax::obj &val)
     //handle the get request conditioned on the key
     switch(key.as<mboard_prop_t>()){
     case MBOARD_PROP_NAME:
-        val = std::string("usrp1 mboard");
+        val = std::string("usrp1 mboard - " + (*_mboard_proxy)[std::string("serial")].as<std::string>());
         return;
 
     case MBOARD_PROP_OTHERS:
@@ -361,18 +371,26 @@ void usrp1_impl::mboard_set(const wax::obj &key, const wax::obj &val)
 
     case MBOARD_PROP_RX_SUBDEV_SPEC:
         _rx_subdev_spec = val.as<subdev_spec_t>();
+        if (_rx_subdev_spec.size() > this->get_num_ddcs()){
+            throw std::runtime_error(str(boost::format(
+                "USRP1 suports up to %u RX channels.\n"
+                "However, this RX subdev spec requires %u channels\n"
+            ) % this->get_num_ddcs() % _rx_subdev_spec.size()));
+        }
         verify_rx_subdev_spec(_rx_subdev_spec, _mboard_proxy->get_link());
-        //sanity check
-        UHD_ASSERT_THROW(_rx_subdev_spec.size() <= 2);
         //set the mux and set the number of rx channels
         _iface->poke32(FR_RX_MUX, calc_rx_mux(_rx_subdev_spec, _mboard_proxy->get_link()));
         return;
 
     case MBOARD_PROP_TX_SUBDEV_SPEC:
         _tx_subdev_spec = val.as<subdev_spec_t>();
+        if (_tx_subdev_spec.size() > this->get_num_ducs()){
+            throw std::runtime_error(str(boost::format(
+                "USRP1 suports up to %u TX channels.\n"
+                "However, this TX subdev spec requires %u channels\n"
+            ) % this->get_num_ducs() % _tx_subdev_spec.size()));
+        }
         verify_tx_subdev_spec(_tx_subdev_spec, _mboard_proxy->get_link());
-        //sanity check
-        UHD_ASSERT_THROW(_tx_subdev_spec.size() <= 2);
         //set the mux and set the number of tx channels
         _iface->poke32(FR_TX_MUX, calc_tx_mux(_tx_subdev_spec, _mboard_proxy->get_link()));
         return;
diff --git a/host/lib/usrp/usrp1/usrp1_ctrl.cpp b/host/lib/usrp/usrp1/usrp1_ctrl.cpp
index 451129ef5..76e8ce368 100644
--- a/host/lib/usrp/usrp1/usrp1_ctrl.cpp
+++ b/host/lib/usrp/usrp1/usrp1_ctrl.cpp
@@ -38,6 +38,8 @@ enum firmware_code {
 
 #define FX2_FIRMWARE_LOAD 0xa0
 
+static const bool load_img_msg = true;
+
 /***********************************************************************
  * Helper Functions
  **********************************************************************/
@@ -178,6 +180,7 @@ public:
         unsigned char reset_n = 0;
 
         //hit the reset line
+        if (load_img_msg) std::cout << "Loading firmware image " << filestring << "..." << std::flush;
         usrp_control_write(FX2_FIRMWARE_LOAD, 0xe600, 0,
                            &reset_y, 1);
  
@@ -213,7 +216,7 @@ public:
 
                 //wait for things to settle
                 boost::this_thread::sleep(boost::posix_time::milliseconds(1000));
-
+                if (load_img_msg) std::cout << " done" << std::endl;
                 return USRP_FIRMWARE_LOAD_SUCCESS; 
             }
             //type anything else is unhandled
@@ -249,45 +252,48 @@ public:
         unsigned char buf[ep0_size];
         int ret;
 
-        FILE *fp;
-        if ((fp = fopen(filename, "rb")) == NULL) {
+        if (load_img_msg) std::cout << "Loading FPGA image: " << filestring << "..." << std::flush;
+        std::ifstream file;
+        file.open(filename, std::ios::in | std::ios::binary);
+        if (not file.good()) {
             std::cerr << "cannot open fpga input file" << std::endl;
-            fclose(fp);
+            file.close();
             return -1;
         }
 
         if (usrp_control_write_cmd(VRQ_FPGA_LOAD, 0, FL_BEGIN) < 0) {
             std::cerr << "fpga load error" << std::endl;
-            fclose(fp);
+            file.close();
             return -1;
         }
 
         ssize_t n;
-        while ((n = fread(buf, 1, sizeof(buf), fp)) > 0) {
+        while ((n = file.readsome((char *)buf, sizeof(buf))) > 0) {
             ret = usrp_control_write(VRQ_FPGA_LOAD, 0, FL_XFER,
                                      buf, n);
             if (ret != n) {
                 std::cerr << "fpga load error " << ret << std::endl;
-                fclose(fp);
+                file.close();
                 return -1;
             }
         }
  
         if (usrp_control_write_cmd(VRQ_FPGA_LOAD, 0, FL_END) < 0) {
             std::cerr << "fpga load error" << std::endl;
-            fclose(fp);
+            file.close();
             return -1;
         }
 
         usrp_set_fpga_hash(hash);
-        fclose(fp);
+        file.close();
+        if (load_img_msg) std::cout << " done" << std::endl;
         return 0; 
     }
 
     int usrp_load_eeprom(std::string filestring)
     {
         const char *filename = filestring.c_str();
-        const uint16_t i2c_addr = 0x50;
+        const boost::uint16_t i2c_addr = 0x50;
 
         //FIXME: verify types
         int len;
@@ -416,7 +422,7 @@ public:
     }
 
 
-    int usrp_control_write_cmd(uint8_t request, uint16_t value, uint16_t index)
+    int usrp_control_write_cmd(boost::uint8_t request, boost::uint16_t value, boost::uint16_t index)
     {
         return usrp_control_write(request, value, index, 0, 0);
     }
diff --git a/host/lib/usrp/usrp1/usrp1_iface.cpp b/host/lib/usrp/usrp1/usrp1_iface.cpp
index 4bc18dd16..5fd3987d5 100644
--- a/host/lib/usrp/usrp1/usrp1_iface.cpp
+++ b/host/lib/usrp/usrp1/usrp1_iface.cpp
@@ -80,7 +80,7 @@ public:
 
     boost::uint32_t peek32(boost::uint32_t addr)
     {
-        uint32_t value_out;
+        boost::uint32_t value_out;
 
         boost::uint8_t w_index_h = SPI_ENABLE_FPGA & 0xff;
         boost::uint8_t w_index_l = (SPI_FMT_MSB | SPI_FMT_HDR_1) & 0xff;
@@ -100,7 +100,7 @@ public:
 
     boost::uint16_t peek16(boost::uint32_t addr)
     {
-        uint32_t val = peek32(addr);
+        boost::uint32_t val = peek32(addr);
         return boost::uint16_t(val & 0xff);
     }
 
diff --git a/host/lib/usrp/usrp1/usrp1_impl.cpp b/host/lib/usrp/usrp1/usrp1_impl.cpp
index a6806dbc3..80ea49e9d 100644
--- a/host/lib/usrp/usrp1/usrp1_impl.cpp
+++ b/host/lib/usrp/usrp1/usrp1_impl.cpp
@@ -62,7 +62,7 @@ static device_addrs_t usrp1_find(const device_addr_t &hint)
             hint.has_key("fw")? hint["fw"] : "usrp1_fw.ihx"
         );
     }
-    catch(const std::exception &e){
+    catch(...){
         uhd::print_warning(
             "Could not locate USRP1 firmware.\n"
             "Please install the images package.\n"
@@ -96,7 +96,10 @@ static device_addrs_t usrp1_find(const device_addr_t &hint)
             device_addr_t new_addr;
             new_addr["type"] = "usrp1";
             new_addr["serial"] = handle->get_serial();
-            usrp1_addrs.push_back(new_addr);
+            //this is a found usrp1 when a hint serial is not specified or it matches
+            if (not hint.has_key("serial") or hint["serial"] == new_addr["serial"]){
+                usrp1_addrs.push_back(new_addr);
+            }
     }
 
     return usrp1_addrs;
diff --git a/host/lib/usrp/usrp1/usrp1_impl.hpp b/host/lib/usrp/usrp1/usrp1_impl.hpp
index c2f693eeb..20ae3c02a 100644
--- a/host/lib/usrp/usrp1/usrp1_impl.hpp
+++ b/host/lib/usrp/usrp1/usrp1_impl.hpp
@@ -91,8 +91,16 @@ public:
                 recv_mode_t,
                 size_t timeout);
 
-    size_t get_max_send_samps_per_packet(void) const { return 0; }
-    size_t get_max_recv_samps_per_packet(void) const { return 0; }
+    static const size_t BYTES_PER_PACKET = 512*4; //under the transfer size
+
+    size_t get_max_send_samps_per_packet(void) const {
+        return BYTES_PER_PACKET/_tx_otw_type.get_sample_size()/_tx_subdev_spec.size();
+    }
+
+    size_t get_max_recv_samps_per_packet(void) const {
+        return BYTES_PER_PACKET/_rx_otw_type.get_sample_size()/_rx_subdev_spec.size();
+    }
+
     bool recv_async_msg(uhd::async_metadata_t &, size_t);
 
 private:
@@ -179,19 +187,27 @@ private:
     void rx_dsp_init(void);
     void rx_dsp_get(const wax::obj &, wax::obj &);
     void rx_dsp_set(const wax::obj &, const wax::obj &);
-    double _rx_dsp_freq; size_t _rx_dsp_decim;
+    uhd::dict<std::string, double> _rx_dsp_freqs;
+    size_t _rx_dsp_decim;
     wax_obj_proxy::sptr _rx_dsp_proxy;
 
     //tx dsp functions and settings
     void tx_dsp_init(void);
     void tx_dsp_get(const wax::obj &, wax::obj &);
     void tx_dsp_set(const wax::obj &, const wax::obj &);
-    double _tx_dsp_freq; size_t _tx_dsp_interp;
+    uhd::dict<std::string, double> _tx_dsp_freqs;
+    size_t _tx_dsp_interp;
     wax_obj_proxy::sptr _tx_dsp_proxy;
 
     //transports
     uhd::transport::usb_zero_copy::sptr _data_transport;
     usrp_ctrl::sptr _ctrl_transport;
+
+    //capabilities
+    size_t get_num_ducs(void);
+    size_t get_num_ddcs(void);
+    bool has_rx_halfband(void);
+    bool has_tx_halfband(void);
 };
 
 #endif /* INCLUDED_USRP1_IMPL_HPP */
diff --git a/host/lib/usrp/usrp2/dsp_impl.cpp b/host/lib/usrp/usrp2/dsp_impl.cpp
index 6422142ce..0c85e643f 100644
--- a/host/lib/usrp/usrp2/dsp_impl.cpp
+++ b/host/lib/usrp/usrp2/dsp_impl.cpp
@@ -56,7 +56,9 @@ void usrp2_mboard_impl::init_ddc_config(void){
 /***********************************************************************
  * DDC Properties
  **********************************************************************/
-void usrp2_mboard_impl::ddc_get(const wax::obj &key, wax::obj &val){
+void usrp2_mboard_impl::ddc_get(const wax::obj &key_, wax::obj &val){
+    named_prop_t key = named_prop_t::extract(key_);
+
     switch(key.as<dsp_prop_t>()){
     case DSP_PROP_NAME:
         val = std::string("usrp2 ddc0");
@@ -70,6 +72,10 @@ void usrp2_mboard_impl::ddc_get(const wax::obj &key, wax::obj &val){
         val = _ddc_freq;
         return;
 
+    case DSP_PROP_FREQ_SHIFT_NAMES:
+        val = prop_names_t(1, "");
+        return;
+
     case DSP_PROP_CODEC_RATE:
         val = get_master_clock_freq();
         return;
@@ -82,7 +88,9 @@ void usrp2_mboard_impl::ddc_get(const wax::obj &key, wax::obj &val){
     }
 }
 
-void usrp2_mboard_impl::ddc_set(const wax::obj &key, const wax::obj &val){
+void usrp2_mboard_impl::ddc_set(const wax::obj &key_, const wax::obj &val){
+    named_prop_t key = named_prop_t::extract(key_);
+
     switch(key.as<dsp_prop_t>()){
 
     case DSP_PROP_FREQ_SHIFT:{
@@ -131,7 +139,9 @@ void usrp2_mboard_impl::init_duc_config(void){
 /***********************************************************************
  * DUC Properties
  **********************************************************************/
-void usrp2_mboard_impl::duc_get(const wax::obj &key, wax::obj &val){
+void usrp2_mboard_impl::duc_get(const wax::obj &key_, wax::obj &val){
+    named_prop_t key = named_prop_t::extract(key_);
+
     switch(key.as<dsp_prop_t>()){
     case DSP_PROP_NAME:
         val = std::string("usrp2 duc0");
@@ -145,6 +155,10 @@ void usrp2_mboard_impl::duc_get(const wax::obj &key, wax::obj &val){
         val = _duc_freq;
         return;
 
+    case DSP_PROP_FREQ_SHIFT_NAMES:
+        val = prop_names_t(1, "");
+        return;
+
     case DSP_PROP_CODEC_RATE:
         val = get_master_clock_freq();
         return;
@@ -157,7 +171,9 @@ void usrp2_mboard_impl::duc_get(const wax::obj &key, wax::obj &val){
     }
 }
 
-void usrp2_mboard_impl::duc_set(const wax::obj &key, const wax::obj &val){
+void usrp2_mboard_impl::duc_set(const wax::obj &key_, const wax::obj &val){
+    named_prop_t key = named_prop_t::extract(key_);
+
     switch(key.as<dsp_prop_t>()){
 
     case DSP_PROP_FREQ_SHIFT:{
diff --git a/host/lib/usrp/usrp2/io_impl.cpp b/host/lib/usrp/usrp2/io_impl.cpp
index 4e883cf81..65411801d 100644
--- a/host/lib/usrp/usrp2/io_impl.cpp
+++ b/host/lib/usrp/usrp2/io_impl.cpp
@@ -150,7 +150,7 @@ void usrp2_impl::io_init(void){
         std::memcpy(send_buff->cast<void*>(), &data, sizeof(data));
         send_buff->commit(sizeof(data));
         //drain the recv buffers (may have junk)
-        while (data_transport->get_recv_buff().get());
+        while (data_transport->get_recv_buff().get()){};
     }
 
     //the number of recv frames is the number for the first transport
@@ -189,7 +189,7 @@ bool usrp2_impl::recv_async_msg(
 /***********************************************************************
  * Send Data
  **********************************************************************/
-bool get_send_buffs(
+static bool get_send_buffs(
     const std::vector<udp_zero_copy::sptr> &trans,
     vrt_packet_handler::managed_send_buffs_t &buffs
 ){