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

Conflicts:
	host/utils/CMakeLists.txt

34 files changed, 1197 insertions, 561 deletions

diff --git a/host/lib/ic_reg_maps/common.py b/host/lib/ic_reg_maps/common.py
index 4aa1ef35e..e27c2816d 100644
--- a/host/lib/ic_reg_maps/common.py
+++ b/host/lib/ic_reg_maps/common.py
@@ -29,30 +29,59 @@ COMMON_TMPL = """\
 \#ifndef INCLUDED_$(name.upper())_HPP
 \#define INCLUDED_$(name.upper())_HPP
 
+\#include <uhd/config.hpp>
 \#include <boost/cstdint.hpp>
+\#include <stdexcept>
+\#include <set>
 
-struct $(name)_t{
-
+class $(name)_t{
+public:
     #for $reg in $regs
-        #if $reg.get_enums()
+    #if $reg.get_enums()
     enum $reg.get_type(){
         #for $i, $enum in enumerate($reg.get_enums())
         #set $end_comma = ',' if $i < len($reg.get_enums())-1 else ''
         $(reg.get_name().upper())_$(enum[0].upper()) = $enum[1]$end_comma
         #end for
     };
-        #end if
+    #end if
     $reg.get_type() $reg.get_name();
     #end for
 
     $(name)_t(void){
-    #for $reg in $regs
+        _state = NULL;
+        #for $reg in $regs
         $reg.get_name() = $reg.get_default();
-    #end for
+        #end for
+    }
+
+    ~$(name)_t(void){
+        delete _state;
     }
 
 $body
 
+    void save_state(void){
+        if (_state == NULL) _state = new $(name)_t();
+        #for $reg in $regs
+        _state->$reg.get_name() = this->$reg.get_name();
+        #end for
+    }
+
+    template<typename T> std::set<T> get_changed_addrs(void){
+        if (_state == NULL) throw std::runtime_error("no saved state");
+        //check each register for changes
+        std::set<T> addrs;
+        #for $reg in $regs
+        if(_state->$reg.get_name() != this->$reg.get_name()){
+            addrs.insert($reg.get_addr());
+        }
+        #end for
+        return addrs;
+    }
+
+private:
+    $(name)_t *_state;
 };
 
 \#endif /* INCLUDED_$(name.upper())_HPP */
diff --git a/host/lib/ic_reg_maps/gen_ad9777_regs.py b/host/lib/ic_reg_maps/gen_ad9777_regs.py
index abb839f0f..690b15e24 100755
--- a/host/lib/ic_reg_maps/gen_ad9777_regs.py
+++ b/host/lib/ic_reg_maps/gen_ad9777_regs.py
@@ -59,7 +59,7 @@ pll_divide_ratio        3[0:1]   0      div1, div2, div4, div8
 ## address 4
 ########################################################################
 pll_state               4[7]     0      off, on
-auto_cp_control         4[6]     0      dis, enb
+auto_cp_control         4[6]     0      auto, manual
 pll_cp_control          4[0:2]   0      50ua=0, 100ua=1, 200ua=2, 400ua=3, 800ua=7
 ########################################################################
 ## address 5 and 9
diff --git a/host/lib/transport/CMakeLists.txt b/host/lib/transport/CMakeLists.txt
index a36f0fc03..ed8c35225 100644
--- a/host/lib/transport/CMakeLists.txt
+++ b/host/lib/transport/CMakeLists.txt
@@ -49,4 +49,5 @@ LIBUHD_APPEND_SOURCES(
     ${CMAKE_SOURCE_DIR}/lib/transport/if_addrs.cpp
     ${CMAKE_SOURCE_DIR}/lib/transport/udp_simple.cpp
     ${CMAKE_SOURCE_DIR}/lib/transport/udp_zero_copy_asio.cpp
+    ${CMAKE_SOURCE_DIR}/lib/transport/vrt_packet_handler.hpp
 )
diff --git a/host/lib/transport/convert_types.cpp b/host/lib/transport/convert_types.cpp
index 8c3d6b17a..43503025a 100644
--- a/host/lib/transport/convert_types.cpp
+++ b/host/lib/transport/convert_types.cpp
@@ -15,6 +15,7 @@
 // along with this program.  If not, see <http://www.gnu.org/licenses/>.
 //
 
+#include <uhd/config.hpp>
 #include <uhd/transport/convert_types.hpp>
 #include <uhd/utils/assert.hpp>
 #include <boost/asio.hpp> //endianness conversion
@@ -49,7 +50,7 @@ static const bool is_big_endian = true;
 static const bool is_big_endian = false;
 #endif
 
-static inline void host_floats_to_usrp2_items(
+static UHD_INLINE void host_floats_to_usrp2_items(
     boost::uint32_t *usrp2_items,
     const fc32_t *host_floats,
     size_t num_samps
@@ -62,7 +63,7 @@ static inline void host_floats_to_usrp2_items(
     unrolled_loop(host_floats_to_usrp2_items_i, num_samps);
 }
 
-static inline void usrp2_items_to_host_floats(
+static UHD_INLINE void usrp2_items_to_host_floats(
     fc32_t *host_floats,
     const boost::uint32_t *usrp2_items,
     size_t num_samps
@@ -76,7 +77,7 @@ static inline void usrp2_items_to_host_floats(
     unrolled_loop(usrp2_items_to_host_floats_i, num_samps);
 }
 
-static inline void host_items_to_usrp2_items(
+static UHD_INLINE void host_items_to_usrp2_items(
     boost::uint32_t *usrp2_items,
     const boost::uint32_t *host_items,
     size_t num_samps
@@ -90,7 +91,7 @@ static inline void host_items_to_usrp2_items(
     }
 }
 
-static inline void usrp2_items_to_host_items(
+static UHD_INLINE void usrp2_items_to_host_items(
     boost::uint32_t *host_items,
     const boost::uint32_t *usrp2_items,
     size_t num_samps
@@ -115,10 +116,13 @@ void transport::convert_io_type_to_otw_type(
     switch(io_type.tid){
     case io_type_t::COMPLEX_FLOAT32:
         host_floats_to_usrp2_items((boost::uint32_t *)otw_buff, (const fc32_t*)io_buff, num_samps);
-        break;
+        return;
     case io_type_t::COMPLEX_INT16:
         host_items_to_usrp2_items((boost::uint32_t *)otw_buff, (const boost::uint32_t*)io_buff, num_samps);
-        break;
+        return;
+     case io_type_t::CUSTOM_TYPE:
+        std::memcpy(otw_buff, io_buff, num_samps*io_type.size);
+        return;
     default:
         throw std::runtime_error(str(boost::format("convert_types: cannot handle type \"%c\"") % io_type.tid));
     }
@@ -135,10 +139,13 @@ void transport::convert_otw_type_to_io_type(
     switch(io_type.tid){
     case io_type_t::COMPLEX_FLOAT32:
         usrp2_items_to_host_floats((fc32_t*)io_buff, (const boost::uint32_t *)otw_buff, num_samps);
-        break;
+        return;
     case io_type_t::COMPLEX_INT16:
         usrp2_items_to_host_items((boost::uint32_t*)io_buff, (const boost::uint32_t *)otw_buff, num_samps);
-        break;
+        return;
+    case io_type_t::CUSTOM_TYPE:
+        std::memcpy(io_buff, otw_buff, num_samps*io_type.size);
+        return;
     default:
         throw std::runtime_error(str(boost::format("convert_types: cannot handle type \"%c\"") % io_type.tid));
     }
diff --git a/host/lib/transport/gen_vrt.py b/host/lib/transport/gen_vrt.py
index 9a57c83c3..c34ffb198 100755
--- a/host/lib/transport/gen_vrt.py
+++ b/host/lib/transport/gen_vrt.py
@@ -57,7 +57,7 @@ void vrt::pack(
     size_t packet_count,           //input
     double tick_rate               //input
 ){
-    boost::uint32_t vrt_hdr_flags;
+    boost::uint32_t vrt_hdr_flags = 0;
 
     boost::uint8_t pred = 0;
     if (metadata.has_stream_id) pred |= $hex($sid_p);
diff --git a/host/lib/transport/udp_zero_copy_asio.cpp b/host/lib/transport/udp_zero_copy_asio.cpp
index ee44803f4..f8a222475 100644
--- a/host/lib/transport/udp_zero_copy_asio.cpp
+++ b/host/lib/transport/udp_zero_copy_asio.cpp
@@ -16,75 +16,69 @@
 //
 
 #include <uhd/transport/udp_zero_copy.hpp>
+#include <uhd/utils/assert.hpp>
 #include <boost/cstdint.hpp>
 #include <boost/asio.hpp>
-#include <boost/thread.hpp>
 #include <boost/format.hpp>
 #include <iostream>
 
 using namespace uhd::transport;
 
 /***********************************************************************
+ * Constants
+ **********************************************************************/
+static const size_t MIN_SOCK_BUFF_SIZE = size_t(100e3);
+static const size_t MAX_DGRAM_SIZE = 2048; //assume max size on send and recv
+static const double RECV_TIMEOUT = 0.1; // 100 ms
+
+/***********************************************************************
  * Managed receive buffer implementation for udp zero-copy asio:
- *   Frees the memory held by the const buffer on done.
  **********************************************************************/
 class managed_recv_buffer_impl : public managed_recv_buffer{
 public:
     managed_recv_buffer_impl(const boost::asio::const_buffer &buff) : _buff(buff){
-        _done = false;
+        /* NOP */
     }
 
     ~managed_recv_buffer_impl(void){
-        if (not _done) this->done();
-    }
-
-    void done(void){
-        _done = true;
-        delete [] boost::asio::buffer_cast<const boost::uint32_t *>(_buff);
+        delete [] this->cast<const boost::uint8_t *>();
     }
 
 private:
-    const boost::asio::const_buffer &get(void){
+    const boost::asio::const_buffer &get(void) const{
         return _buff;
     }
 
     const boost::asio::const_buffer _buff;
-    bool _done;
 };
 
 /***********************************************************************
  * Managed send buffer implementation for udp zero-copy asio:
- *   Sends and frees the memory held by the mutable buffer on done.
  **********************************************************************/
 class managed_send_buffer_impl : public managed_send_buffer{
 public:
     managed_send_buffer_impl(
         const boost::asio::mutable_buffer &buff,
         boost::asio::ip::udp::socket *socket
-    ) : _buff(buff){
-        _done = false;
-        _socket = socket;
+    ) : _buff(buff), _socket(socket){
+        /* NOP */
     }
 
     ~managed_send_buffer_impl(void){
-        if (not _done) this->done(0);
+        /* NOP */
     }
 
-    void done(size_t num_bytes){
-        _done = true;
-        boost::uint32_t *mem = boost::asio::buffer_cast<boost::uint32_t *>(_buff);
-        _socket->send(boost::asio::buffer(mem, num_bytes));
-        delete [] mem;
+    void commit(size_t num_bytes){
+        _socket->send(boost::asio::buffer(_buff, num_bytes));
     }
 
 private:
-    const boost::asio::mutable_buffer &get(void){
+    const boost::asio::mutable_buffer &get(void) const{
         return _buff;
     }
 
     const boost::asio::mutable_buffer _buff;
     boost::asio::ip::udp::socket      *_socket;
-    bool _done;
 };
 
 /***********************************************************************
@@ -96,6 +90,8 @@ private:
  **********************************************************************/
 class udp_zero_copy_impl : public udp_zero_copy{
 public:
+    typedef boost::shared_ptr<udp_zero_copy_impl> sptr;
+
     //structors
     udp_zero_copy_impl(const std::string &addr, const std::string &port);
     ~udp_zero_copy_impl(void);
@@ -104,23 +100,27 @@ public:
     managed_recv_buffer::sptr get_recv_buff(void);
     managed_send_buffer::sptr get_send_buff(void);
 
-    //resize
-    size_t resize_recv_buff(size_t num_bytes){
-        boost::asio::socket_base::receive_buffer_size option(num_bytes);
-        _socket->set_option(option);
+    //manage buffer
+    template <typename Opt> size_t get_buff_size(void){
+        Opt option;
         _socket->get_option(option);
         return option.value();
     }
-    size_t resize_send_buff(size_t num_bytes){
-        boost::asio::socket_base::send_buffer_size option(num_bytes);
+
+    template <typename Opt> size_t resize_buff(size_t num_bytes){
+        Opt option(num_bytes);
         _socket->set_option(option);
-        _socket->get_option(option);
-        return option.value();
+        return get_buff_size<Opt>();
     }
 
 private:
     boost::asio::ip::udp::socket   *_socket;
     boost::asio::io_service        _io_service;
+
+    //send and recv buffer memory (allocated once)
+    boost::uint8_t _send_mem[MIN_SOCK_BUFF_SIZE];
+
+    managed_send_buffer::sptr _send_buff;
 };
 
 udp_zero_copy_impl::udp_zero_copy_impl(const std::string &addr, const std::string &port){
@@ -131,10 +131,25 @@ udp_zero_copy_impl::udp_zero_copy_impl(const std::string &addr, const std::strin
     boost::asio::ip::udp::resolver::query query(boost::asio::ip::udp::v4(), addr, port);
     boost::asio::ip::udp::endpoint receiver_endpoint = *resolver.resolve(query);
 
-    // Create, open, and connect the socket
+    // create, open, and connect the socket
     _socket = new boost::asio::ip::udp::socket(_io_service);
     _socket->open(boost::asio::ip::udp::v4());
     _socket->connect(receiver_endpoint);
+
+    // create the managed send buff (just once)
+    _send_buff = managed_send_buffer::sptr(new managed_send_buffer_impl(
+        boost::asio::buffer(_send_mem, MIN_SOCK_BUFF_SIZE), _socket
+    ));
+
+    // set recv timeout
+    timeval tv;
+    tv.tv_sec = 0;
+    tv.tv_usec = size_t(RECV_TIMEOUT*1e6);
+    UHD_ASSERT_THROW(setsockopt(
+        _socket->native(),
+        SOL_SOCKET, SO_RCVTIMEO,
+        (const char *)&tv, sizeof(timeval)
+    ) == 0);
 }
 
 udp_zero_copy_impl::~udp_zero_copy_impl(void){
@@ -142,61 +157,56 @@ udp_zero_copy_impl::~udp_zero_copy_impl(void){
 }
 
 managed_recv_buffer::sptr udp_zero_copy_impl::get_recv_buff(void){
-    //implement timeout through polling and sleeping
-    size_t available = 0;
-    boost::asio::deadline_timer timer(_socket->get_io_service());
-    timer.expires_from_now(boost::posix_time::milliseconds(100));
-    while (not ((available = _socket->available()) or timer.expires_from_now().is_negative())){
-        boost::this_thread::sleep(boost::posix_time::milliseconds(1));
-    }
+    //allocate memory
+    boost::uint8_t *recv_mem = new boost::uint8_t[MAX_DGRAM_SIZE];
 
-    //receive only if data is available
-    boost::uint32_t *buff_mem = new boost::uint32_t[available/sizeof(boost::uint32_t)];
-    if (available){
-        available = _socket->receive(boost::asio::buffer(buff_mem, available));
-    }
+    //call recv() with timeout option
+    size_t num_bytes = _socket->receive(boost::asio::buffer(recv_mem, MIN_SOCK_BUFF_SIZE));
 
     //create a new managed buffer to house the data
     return managed_recv_buffer::sptr(
-        new managed_recv_buffer_impl(boost::asio::buffer(buff_mem, available))
+        new managed_recv_buffer_impl(boost::asio::buffer(recv_mem, num_bytes))
     );
 }
 
 managed_send_buffer::sptr udp_zero_copy_impl::get_send_buff(void){
-    boost::uint32_t *buff_mem = new boost::uint32_t[2000/sizeof(boost::uint32_t)];
-    return managed_send_buffer::sptr(
-        new managed_send_buffer_impl(boost::asio::buffer(buff_mem, 2000), _socket)
-    );
+    return _send_buff; //FIXME there is only ever one send buff, we assume that the caller doesnt hang onto these
 }
 
 /***********************************************************************
  * UDP zero copy make function
  **********************************************************************/
+template<typename Opt> static inline void resize_buff_helper(
+    udp_zero_copy_impl::sptr udp_trans,
+    size_t target_size,
+    const std::string &name
+){
+    //resize the buffer if size was provided
+    if (target_size > 0){
+        size_t actual_size = udp_trans->resize_buff<Opt>(target_size);
+        if (target_size != actual_size) std::cout << boost::format(
+            "Target %s buffer size: %d\n"
+            "Actual %s byffer size: %d"
+        ) % name % target_size % name % actual_size << std::endl;
+    }
+
+    //otherwise, ensure that the buffer is at least the minimum size
+    else if (udp_trans->get_buff_size<Opt>() < MIN_SOCK_BUFF_SIZE){
+        resize_buff_helper<Opt>(udp_trans, MIN_SOCK_BUFF_SIZE, name);
+    }
+}
+
 udp_zero_copy::sptr udp_zero_copy::make(
     const std::string &addr,
     const std::string &port,
     size_t recv_buff_size,
     size_t send_buff_size
 ){
-    boost::shared_ptr<udp_zero_copy_impl> udp_trans(new udp_zero_copy_impl(addr, port));
-
-    //resize the recv buffer if size was provided
-    if (recv_buff_size > 0){
-        size_t actual_bytes = udp_trans->resize_recv_buff(recv_buff_size);
-        if (recv_buff_size != actual_bytes) std::cout << boost::format(
-            "Target recv buffer size: %d\n"
-            "Actual recv byffer size: %d"
-        ) % recv_buff_size % actual_bytes << std::endl;
-    }
+    udp_zero_copy_impl::sptr udp_trans(new udp_zero_copy_impl(addr, port));
 
-    //resize the send buffer if size was provided
-    if (send_buff_size > 0){
-        size_t actual_bytes = udp_trans->resize_send_buff(send_buff_size);
-        if (send_buff_size != actual_bytes) std::cout << boost::format(
-            "Target send buffer size: %d\n"
-            "Actual send byffer size: %d"
-        ) % send_buff_size % actual_bytes << std::endl;
-    }
+    //call the helper to resize send and recv buffers
+    resize_buff_helper<boost::asio::socket_base::receive_buffer_size>(udp_trans, recv_buff_size, "recv");
+    resize_buff_helper<boost::asio::socket_base::send_buffer_size>   (udp_trans, send_buff_size, "send");
 
     return udp_trans;
 }
diff --git a/host/lib/transport/vrt_packet_handler.hpp b/host/lib/transport/vrt_packet_handler.hpp
new file mode 100644
index 000000000..e64e3383d
--- /dev/null
+++ b/host/lib/transport/vrt_packet_handler.hpp
@@ -0,0 +1,370 @@
+//
+// 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_VRT_PACKET_HANDLER_HPP
+#define INCLUDED_LIBUHD_TRANSPORT_VRT_PACKET_HANDLER_HPP
+
+#include <uhd/config.hpp>
+#include <uhd/device.hpp>
+#include <uhd/types/io_type.hpp>
+#include <uhd/types/otw_type.hpp>
+#include <uhd/types/metadata.hpp>
+#include <uhd/transport/vrt.hpp>
+#include <uhd/transport/convert_types.hpp>
+#include <uhd/transport/zero_copy.hpp>
+#include <boost/asio/buffer.hpp>
+#include <boost/function.hpp>
+#include <stdexcept>
+#include <iostream>
+
+namespace vrt_packet_handler{
+
+/***********************************************************************
+ * vrt packet handler for recv
+ **********************************************************************/
+    struct recv_state{
+        //init the expected seq number
+        size_t next_packet_seq;
+
+        //state variables to handle fragments
+        uhd::transport::managed_recv_buffer::sptr managed_buff;
+        boost::asio::const_buffer copy_buff;
+        size_t fragment_offset_in_samps;
+
+        recv_state(void){
+            //first expected seq is zero
+            next_packet_seq = 0;
+
+            //initially empty copy buffer
+            copy_buff = boost::asio::buffer("", 0);
+        }
+    };
+
+    typedef boost::function<void(uhd::transport::managed_recv_buffer::sptr)> recv_cb_t;
+
+    static UHD_INLINE void recv_cb_nop(uhd::transport::managed_recv_buffer::sptr){
+        /* NOP */
+    }
+
+    /*******************************************************************
+     * Unpack a received vrt header and set the copy buffer.
+     *  - helper function for vrt_packet_handler::_recv1
+     ******************************************************************/
+    static UHD_INLINE void _recv1_helper(
+        recv_state &state,
+        uhd::rx_metadata_t &metadata,
+        double tick_rate,
+        size_t vrt_header_offset_words32
+    ){
+        size_t num_packet_words32 = state.managed_buff->size()/sizeof(boost::uint32_t);
+        if (num_packet_words32 <= vrt_header_offset_words32){
+            state.copy_buff = boost::asio::buffer("", 0);
+            return; //must exit here after setting the buffer
+        }
+        const boost::uint32_t *vrt_hdr = state.managed_buff->cast<const boost::uint32_t *>() + vrt_header_offset_words32;
+        size_t num_header_words32_out, num_payload_words32_out, packet_count_out;
+        uhd::transport::vrt::unpack(
+            metadata,                //output
+            vrt_hdr,                 //input
+            num_header_words32_out,  //output
+            num_payload_words32_out, //output
+            num_packet_words32,      //input
+            packet_count_out,        //output
+            tick_rate
+        );
+
+        //handle the packet count / sequence number
+        if (packet_count_out != state.next_packet_seq){
+            std::cerr << "S" << (packet_count_out - state.next_packet_seq)%16;
+        }
+        state.next_packet_seq = (packet_count_out+1)%16;
+
+        //setup the buffer to point to the data
+        state.copy_buff = boost::asio::buffer(
+            vrt_hdr + num_header_words32_out,
+            num_payload_words32_out*sizeof(boost::uint32_t)
+        );
+    }
+
+    /*******************************************************************
+     * Recv data, unpack a vrt header, and copy-convert the data.
+     *  - helper function for vrt_packet_handler::recv
+     ******************************************************************/
+    static UHD_INLINE size_t _recv1(
+        recv_state &state,
+        void *recv_mem,
+        size_t total_samps,
+        uhd::rx_metadata_t &metadata,
+        const uhd::io_type_t &io_type,
+        const uhd::otw_type_t &otw_type,
+        double tick_rate,
+        uhd::transport::zero_copy_if::sptr zc_iface,
+        //use these two params to handle a layer above vrt
+        size_t vrt_header_offset_words32,
+        const recv_cb_t& recv_cb
+    ){
+        //perform a receive if no rx data is waiting to be copied
+        if (boost::asio::buffer_size(state.copy_buff) == 0){
+            state.fragment_offset_in_samps = 0;
+            state.managed_buff = zc_iface->get_recv_buff();
+            recv_cb(state.managed_buff); //callback before vrt unpack
+            try{
+                _recv1_helper(
+                    state, metadata, tick_rate, vrt_header_offset_words32
+                );
+            }catch(const std::exception &e){
+                std::cerr << "Error (recv): " << e.what() << std::endl;
+                return 0;
+            }
+        }
+
+        //extract the number of samples available to copy
+        size_t bytes_per_item = otw_type.get_sample_size();
+        size_t bytes_available = boost::asio::buffer_size(state.copy_buff);
+        size_t num_samps = std::min(total_samps, bytes_available/bytes_per_item);
+
+        //setup the fragment flags and offset
+        metadata.more_fragments = total_samps < num_samps;
+        metadata.fragment_offset = state.fragment_offset_in_samps;
+        state.fragment_offset_in_samps += num_samps; //set for next call
+
+        //copy-convert the samples from the recv buffer
+        uhd::transport::convert_otw_type_to_io_type(
+            boost::asio::buffer_cast<const void*>(state.copy_buff), otw_type,
+            recv_mem, io_type, num_samps
+        );
+
+        //update the rx copy buffer to reflect the bytes copied
+        size_t bytes_copied = num_samps*bytes_per_item;
+        state.copy_buff = boost::asio::buffer(
+            boost::asio::buffer_cast<const boost::uint8_t*>(state.copy_buff) + bytes_copied,
+            bytes_available - bytes_copied
+        );
+
+        return num_samps;
+    }
+
+    /*******************************************************************
+     * Recv vrt packets and copy convert the samples into the buffer.
+     ******************************************************************/
+    static UHD_INLINE size_t recv(
+        recv_state &state,
+        const boost::asio::mutable_buffer &buff,
+        uhd::rx_metadata_t &metadata,
+        uhd::device::recv_mode_t recv_mode,
+        const uhd::io_type_t &io_type,
+        const uhd::otw_type_t &otw_type,
+        double tick_rate,
+        uhd::transport::zero_copy_if::sptr zc_iface,
+        //use these two params to handle a layer above vrt
+        size_t vrt_header_offset_words32 = 0,
+        const recv_cb_t& recv_cb = &recv_cb_nop
+    ){
+        metadata = uhd::rx_metadata_t(); //init the metadata
+        const size_t total_num_samps = boost::asio::buffer_size(buff)/io_type.size;
+
+        switch(recv_mode){
+
+        ////////////////////////////////////////////////////////////////
+        case uhd::device::RECV_MODE_ONE_PACKET:{
+        ////////////////////////////////////////////////////////////////
+            return _recv1(
+                state,
+                boost::asio::buffer_cast<void *>(buff),
+                total_num_samps,
+                metadata,
+                io_type, otw_type,
+                tick_rate,
+                zc_iface,
+                vrt_header_offset_words32,
+                recv_cb
+            );
+        }
+
+        ////////////////////////////////////////////////////////////////
+        case uhd::device::RECV_MODE_FULL_BUFF:{
+        ////////////////////////////////////////////////////////////////
+            size_t accum_num_samps = 0;
+            uhd::rx_metadata_t tmp_md;
+            while(accum_num_samps < total_num_samps){
+                size_t num_samps = _recv1(
+                    state,
+                    boost::asio::buffer_cast<boost::uint8_t *>(buff) + (accum_num_samps*io_type.size),
+                    total_num_samps - accum_num_samps,
+                    (accum_num_samps == 0)? metadata : tmp_md, //only the first metadata gets kept
+                    io_type, otw_type,
+                    tick_rate,
+                    zc_iface,
+                    vrt_header_offset_words32,
+                    recv_cb
+                );
+                if (num_samps == 0) break; //had a recv timeout or error, break loop
+                accum_num_samps += num_samps;
+            }
+            return accum_num_samps;
+        }
+
+        default: throw std::runtime_error("unknown recv mode");
+        }//switch(recv_mode)
+    }
+
+/***********************************************************************
+ * vrt packet handler for send
+ **********************************************************************/
+    struct send_state{
+        //init the expected seq number
+        size_t next_packet_seq;
+
+        send_state(void){
+            next_packet_seq = 0;
+        }
+    };
+
+    typedef boost::function<void(uhd::transport::managed_send_buffer::sptr)> send_cb_t;
+
+    static UHD_INLINE void send_cb_nop(uhd::transport::managed_send_buffer::sptr){
+        /* NOP */
+    }
+
+    /*******************************************************************
+     * Pack a vrt header, copy-convert the data, and send it.
+     *  - helper function for vrt_packet_handler::send
+     ******************************************************************/
+    static UHD_INLINE void _send1(
+        send_state &state,
+        const void *send_mem,
+        size_t num_samps,
+        const uhd::tx_metadata_t &metadata,
+        const uhd::io_type_t &io_type,
+        const uhd::otw_type_t &otw_type,
+        double tick_rate,
+        uhd::transport::zero_copy_if::sptr zc_iface,
+        size_t vrt_header_offset_words32,
+        const send_cb_t& send_cb
+    ){
+        //get a new managed send buffer
+        uhd::transport::managed_send_buffer::sptr send_buff = zc_iface->get_send_buff();
+        boost::uint32_t *tx_mem = send_buff->cast<boost::uint32_t *>() + vrt_header_offset_words32;
+
+        size_t num_header_words32, num_packet_words32;
+        size_t packet_count = state.next_packet_seq++;
+
+        //pack metadata into a vrt header
+        uhd::transport::vrt::pack(
+            metadata,            //input
+            tx_mem,              //output
+            num_header_words32,  //output
+            num_samps,           //input
+            num_packet_words32,  //output
+            packet_count,        //input
+            tick_rate
+        );
+
+        //copy-convert the samples into the send buffer
+        uhd::transport::convert_io_type_to_otw_type(
+            send_mem, io_type,
+            tx_mem + num_header_words32, otw_type,
+            num_samps
+        );
+
+        send_cb(send_buff); //callback after memory filled
+
+        //commit the samples to the zero-copy interface
+        send_buff->commit(num_packet_words32*sizeof(boost::uint32_t));
+    }
+
+    /*******************************************************************
+     * Send vrt packets and copy convert the samples into the buffer.
+     ******************************************************************/
+    static UHD_INLINE size_t send(
+        send_state &state,
+        const boost::asio::const_buffer &buff,
+        const uhd::tx_metadata_t &metadata,
+        uhd::device::send_mode_t send_mode,
+        const uhd::io_type_t &io_type,
+        const uhd::otw_type_t &otw_type,
+        double tick_rate,
+        uhd::transport::zero_copy_if::sptr zc_iface,
+        size_t max_samples_per_packet,
+        //use these two params to handle a layer above vrt
+        size_t vrt_header_offset_words32 = 0,
+        const send_cb_t& send_cb = &send_cb_nop
+    ){
+        const size_t total_num_samps = boost::asio::buffer_size(buff)/io_type.size;
+        if (total_num_samps <= max_samples_per_packet) send_mode = uhd::device::SEND_MODE_ONE_PACKET;
+        switch(send_mode){
+
+        ////////////////////////////////////////////////////////////////
+        case uhd::device::SEND_MODE_ONE_PACKET:{
+        ////////////////////////////////////////////////////////////////
+            size_t num_samps = std::min(total_num_samps, max_samples_per_packet);
+            _send1(
+                state,
+                boost::asio::buffer_cast<const void *>(buff),
+                num_samps,
+                metadata,
+                io_type, otw_type,
+                tick_rate,
+                zc_iface,
+                vrt_header_offset_words32,
+                send_cb
+            );
+            return num_samps;
+        }
+
+        ////////////////////////////////////////////////////////////////
+        case uhd::device::SEND_MODE_FULL_BUFF:{
+        ////////////////////////////////////////////////////////////////
+            //calculate constants for fragmentation
+            const size_t num_fragments = (total_num_samps+max_samples_per_packet-1)/max_samples_per_packet;
+            static const size_t first_fragment_index = 0;
+            const size_t final_fragment_index = num_fragments-1;
+
+            //make a rw copy of the metadata to re-flag below
+            uhd::tx_metadata_t md(metadata);
+
+            //loop through the following fragment indexes
+            for (size_t n = first_fragment_index; n <= final_fragment_index; n++){
+
+                //calculate new flags for the fragments
+                md.has_time_spec  = metadata.has_time_spec  and (n == first_fragment_index);
+                md.start_of_burst = metadata.start_of_burst and (n == first_fragment_index);
+                md.end_of_burst   = metadata.end_of_burst   and (n == final_fragment_index);
+
+                //send the fragment with the helper function
+                _send1(
+                    state,
+                    boost::asio::buffer_cast<const boost::uint8_t *>(buff) + (n*max_samples_per_packet*io_type.size),
+                    (n == final_fragment_index)?(total_num_samps%max_samples_per_packet):max_samples_per_packet,
+                    md,
+                    io_type, otw_type,
+                    tick_rate,
+                    zc_iface,
+                    vrt_header_offset_words32,
+                    send_cb
+                );
+            }
+            return total_num_samps;
+        }
+
+        default: throw std::runtime_error("unknown send mode");
+        }//switch(send_mode)
+    }
+
+} //namespace vrt_packet_handler
+
+#endif /* INCLUDED_LIBUHD_TRANSPORT_VRT_PACKET_HANDLER_HPP */
diff --git a/host/lib/types.cpp b/host/lib/types.cpp
index ec9c8ac01..daf3be7f7 100644
--- a/host/lib/types.cpp
+++ b/host/lib/types.cpp
@@ -15,6 +15,7 @@
 // along with this program.  If not, see <http://www.gnu.org/licenses/>.
 //
 
+#include <uhd/utils/assert.hpp>
 #include <uhd/types/ranges.hpp>
 #include <uhd/types/tune_result.hpp>
 #include <uhd/types/clock_config.hpp>
@@ -41,73 +42,89 @@ using namespace uhd;
 /***********************************************************************
  * ranges
  **********************************************************************/
-gain_range_t::gain_range_t(float min_, float max_, float step_){
-    min = min_;
-    max = max_;
-    step = step_;
+gain_range_t::gain_range_t(float min, float max, float step):
+    min(min),
+    max(max),
+    step(step)
+{
+    /* NOP */
 }
 
-freq_range_t::freq_range_t(double min_, double max_){
-    min = min_;
-    max = max_;
+freq_range_t::freq_range_t(double min, double max):
+    min(min),
+    max(max)
+{
+    /* NOP */
 }
 
 /***********************************************************************
  * tune result
  **********************************************************************/
-tune_result_t::tune_result_t(void){
-    target_inter_freq = 0.0;
-    actual_inter_freq = 0.0;
-    target_dsp_freq = 0.0;
-    actual_dsp_freq = 0.0;
-    spectrum_inverted = false;
+tune_result_t::tune_result_t(void):
+    target_inter_freq(0.0),
+    actual_inter_freq(0.0),
+    target_dsp_freq(0.0),
+    actual_dsp_freq(0.0),
+    spectrum_inverted(false)
+{
+    /* NOP */
 }
 
 /***********************************************************************
  * clock config
  **********************************************************************/
-clock_config_t::clock_config_t(void){
-    ref_source = REF_INT,
-    pps_source = PPS_INT,
-    pps_polarity = PPS_NEG;
+clock_config_t::clock_config_t(void):
+    ref_source(REF_INT),
+    pps_source(PPS_INT),
+    pps_polarity(PPS_NEG)
+{
+    /* NOP */
 }
 
 /***********************************************************************
  * stream command
  **********************************************************************/
-stream_cmd_t::stream_cmd_t(const stream_mode_t &stream_mode_){
-    stream_mode = stream_mode_;
-    stream_now = true;
-    num_samps = 0;
+stream_cmd_t::stream_cmd_t(const stream_mode_t &stream_mode):
+    stream_mode(stream_mode),
+    num_samps(0),
+    stream_now(true)
+{
+    /* NOP */
 }
 
 /***********************************************************************
  * metadata
  **********************************************************************/
-rx_metadata_t::rx_metadata_t(void){
-    stream_id = 0;
-    has_stream_id = false;
-    time_spec = time_spec_t();
-    has_time_spec = false;
-    more_fragments = false;
-    fragment_offset = 0;
+rx_metadata_t::rx_metadata_t(void):
+    has_stream_id(false),
+    stream_id(0),
+    has_time_spec(false),
+    time_spec(time_spec_t()),
+    more_fragments(false),
+    fragment_offset(0)
+{
+    /* NOP */
 }
 
-tx_metadata_t::tx_metadata_t(void){
-    stream_id = 0;
-    has_stream_id = false;
-    time_spec = time_spec_t();
-    has_time_spec = false;
-    start_of_burst = false;
-    end_of_burst = false;
+tx_metadata_t::tx_metadata_t(void):
+    has_stream_id(false),
+    stream_id(0),
+    has_time_spec(false),
+    time_spec(time_spec_t()),
+    start_of_burst(false),
+    end_of_burst(false)
+{
+    /* NOP */
 }
 
 /***********************************************************************
  * time spec
  **********************************************************************/
-time_spec_t::time_spec_t(boost::uint32_t secs_, double nsecs_){
-    secs = secs_;
-    nsecs = nsecs_;
+time_spec_t::time_spec_t(boost::uint32_t secs, double nsecs):
+    secs(secs),
+    nsecs(nsecs)
+{
+    /* NOP */
 }
 
 boost::uint32_t time_spec_t::get_ticks(double tick_rate) const{
@@ -164,17 +181,18 @@ std::string device_addr_t::to_string(void) const{
 /***********************************************************************
  * mac addr
  **********************************************************************/
-mac_addr_t::mac_addr_t(const boost::uint8_t *bytes){
-    std::copy(bytes, bytes+hlen, _bytes);
+mac_addr_t::mac_addr_t(const byte_vector_t &bytes) : _bytes(bytes){
+    UHD_ASSERT_THROW(_bytes.size() == 6);
 }
 
-mac_addr_t mac_addr_t::from_bytes(const boost::uint8_t *bytes){
+mac_addr_t mac_addr_t::from_bytes(const byte_vector_t &bytes){
     return mac_addr_t(bytes);
 }
 
 mac_addr_t mac_addr_t::from_string(const std::string &mac_addr_str){
 
-    boost::uint8_t p[hlen] = {0x00, 0x50, 0xC2, 0x85, 0x30, 0x00}; // Matt's IAB
+    byte_vector_t bytes = boost::assign::list_of
+        (0x00)(0x50)(0xC2)(0x85)(0x30)(0x00); // Matt's IAB
 
     try{
         //only allow patterns of xx:xx or xx:xx:xx:xx:xx:xx
@@ -189,7 +207,7 @@ mac_addr_t mac_addr_t::from_string(const std::string &mac_addr_str){
             int hex_num;
             std::istringstream iss(hex_strs[i]);
             iss >> std::hex >> hex_num;
-            p[i] = boost::uint8_t(hex_num);
+            bytes[i] = boost::uint8_t(hex_num);
         }
 
     }
@@ -199,28 +217,34 @@ mac_addr_t mac_addr_t::from_string(const std::string &mac_addr_str){
         ));
     }
 
-    return from_bytes(p);
+    return mac_addr_t::from_bytes(bytes);
 }
 
-const boost::uint8_t *mac_addr_t::to_bytes(void) const{
+byte_vector_t mac_addr_t::to_bytes(void) const{
     return _bytes;
 }
 
 std::string mac_addr_t::to_string(void) const{
-    return str(
-        boost::format("%02x:%02x:%02x:%02x:%02x:%02x")
-        % int(to_bytes()[0]) % int(to_bytes()[1]) % int(to_bytes()[2])
-        % int(to_bytes()[3]) % int(to_bytes()[4]) % int(to_bytes()[5])
-    );
+    std::string addr = "";
+    BOOST_FOREACH(boost::uint8_t byte, this->to_bytes()){
+        addr += str(boost::format("%s%02x") % ((addr == "")?"":":") % int(byte));
+    }
+    return addr;
 }
 
 /***********************************************************************
  * otw type
  **********************************************************************/
-otw_type_t::otw_type_t(void){
-    width = 0;
-    shift = 0;
-    byteorder = BO_NATIVE;
+size_t otw_type_t::get_sample_size(void) const{
+    return (this->width * 2) / 8;
+}
+
+otw_type_t::otw_type_t(void):
+    width(0),
+    shift(0),
+    byteorder(BO_NATIVE)
+{
+    /* NOP */
 }
 
 /***********************************************************************
@@ -248,9 +272,11 @@ io_type_t::io_type_t(size_t size)
 /***********************************************************************
  * serial
  **********************************************************************/
-spi_config_t::spi_config_t(edge_t edge){
-    mosi_edge = edge;
-    miso_edge = edge;
+spi_config_t::spi_config_t(edge_t edge):
+    mosi_edge(edge),
+    miso_edge(edge)
+{
+    /* NOP */
 }
 
 void i2c_iface::write_eeprom(
diff --git a/host/lib/usrp/dboard/db_rfx.cpp b/host/lib/usrp/dboard/db_rfx.cpp
index bbc9716b1..89e707718 100644
--- a/host/lib/usrp/dboard/db_rfx.cpp
+++ b/host/lib/usrp/dboard/db_rfx.cpp
@@ -15,8 +15,6 @@
 // along with this program.  If not, see <http://www.gnu.org/licenses/>.
 //
 
-static const bool rfx_debug = false;
-
 // IO Pin functions
 #define POWER_IO     (1 << 7)   // Low enables power supply
 #define ANTSW_IO     (1 << 6)   // On TX DB, 0 = TX, 1 = RX, on RX DB 0 = main ant, 1 = RX2
@@ -56,10 +54,23 @@ using namespace uhd::usrp;
 using namespace boost::assign;
 
 /***********************************************************************
- * The RFX series of dboards
+ * The RFX Series constants
  **********************************************************************/
-static const float _max_rx_pga0_gain = 45;
+static const bool rfx_debug = false;
+
+static const prop_names_t rfx_tx_antennas = list_of("TX/RX");
+
+static const prop_names_t rfx_rx_antennas = list_of("TX/RX")("RX2");
 
+static const uhd::dict<std::string, gain_range_t> rfx_tx_gain_ranges; //empty
+
+static const uhd::dict<std::string, gain_range_t> rfx_rx_gain_ranges = map_list_of
+    ("PGA0", gain_range_t(0, 45, float(0.022)))
+;
+
+/***********************************************************************
+ * The RFX series of dboards
+ **********************************************************************/
 class rfx_xcvr : public xcvr_dboard_base{
 public:
     rfx_xcvr(
@@ -85,6 +96,10 @@ private:
     void set_rx_lo_freq(double freq);
     void set_tx_lo_freq(double freq);
     void set_rx_ant(const std::string &ant);
+    void set_tx_ant(const std::string &ant);
+    void set_rx_gain(float gain, const std::string &name);
+    void set_tx_gain(float gain, const std::string &name);
+
     void set_rx_pga0_gain(float gain);
 
     /*!
@@ -161,8 +176,10 @@ rfx_xcvr::rfx_xcvr(
     this->get_iface()->set_clock_enabled(dboard_iface::UNIT_TX, true);
     this->get_iface()->set_clock_enabled(dboard_iface::UNIT_RX, true);
 
-    //set the gpio directions
+    //set the gpio directions and atr controls (identically)
     boost::uint16_t output_enables = POWER_IO | ANTSW_IO | MIXER_IO;
+    this->get_iface()->set_pin_ctrl(dboard_iface::UNIT_TX, output_enables);
+    this->get_iface()->set_pin_ctrl(dboard_iface::UNIT_RX, output_enables);
     this->get_iface()->set_gpio_ddr(dboard_iface::UNIT_TX, output_enables);
     this->get_iface()->set_gpio_ddr(dboard_iface::UNIT_RX, output_enables);
 
@@ -189,19 +206,11 @@ rfx_xcvr::~rfx_xcvr(void){
 }
 
 /***********************************************************************
- * Helper Methods
+ * Antenna Handling
  **********************************************************************/
-void rfx_xcvr::set_rx_lo_freq(double freq){
-    _rx_lo_freq = set_lo_freq(dboard_iface::UNIT_RX, freq);
-}
-
-void rfx_xcvr::set_tx_lo_freq(double freq){
-    _tx_lo_freq = set_lo_freq(dboard_iface::UNIT_TX, freq);
-}
-
 void rfx_xcvr::set_rx_ant(const std::string &ant){
     //validate input
-    UHD_ASSERT_THROW(ant == "TX/RX" or ant == "RX2");
+    assert_has(rfx_rx_antennas, ant, "rfx rx antenna name");
 
     //set the rx atr regs that change with antenna setting
     this->get_iface()->set_atr_reg(
@@ -213,22 +222,51 @@ void rfx_xcvr::set_rx_ant(const std::string &ant){
     _rx_ant = ant;
 }
 
-void rfx_xcvr::set_rx_pga0_gain(float gain){
-    //clip the input
-    gain = std::clip<float>(gain, 0, _max_rx_pga0_gain);
+void rfx_xcvr::set_tx_ant(const std::string &ant){
+    assert_has(rfx_tx_antennas, ant, "rfx tx antenna name");
+    //only one antenna option, do nothing
+}
+
+/***********************************************************************
+ * Gain Handling
+ **********************************************************************/
+void rfx_xcvr::set_tx_gain(float, const std::string &name){
+    assert_has(rfx_tx_gain_ranges.keys(), name, "rfx tx gain name");
+    UHD_ASSERT_THROW(false); //no gains to set
+}
+
+void rfx_xcvr::set_rx_gain(float gain, const std::string &name){
+    assert_has(rfx_rx_gain_ranges.keys(), name, "rfx rx gain name");
+    if(name == "PGA0"){
+        this->set_rx_pga0_gain(gain);
+    }
+    else UHD_ASSERT_THROW(false);
+}
 
-    //voltage level constants
+void rfx_xcvr::set_rx_pga0_gain(float gain){
+    //voltage level constants (negative slope)
     static const float max_volts = float(.2), min_volts = float(1.2);
-    static const float slope = (max_volts-min_volts)/_max_rx_pga0_gain;
+    static const float slope = (max_volts-min_volts)/45;
 
     //calculate the voltage for the aux dac
-    float dac_volts = gain*slope + min_volts;
+    float dac_volts = std::clip<float>(gain*slope + min_volts, max_volts, min_volts);
 
     //write the new voltage to the aux dac
     this->get_iface()->write_aux_dac(dboard_iface::UNIT_RX, 1, dac_volts);
 
-    //shadow the setting (does not account for precision loss)
-    _rx_pga0_gain = gain;
+    //shadow the actual gain setting
+    _rx_pga0_gain = (dac_volts - min_volts)/slope;
+}
+
+/***********************************************************************
+ * Tuning
+ **********************************************************************/
+void rfx_xcvr::set_rx_lo_freq(double freq){
+    _rx_lo_freq = set_lo_freq(dboard_iface::UNIT_RX, freq);
+}
+
+void rfx_xcvr::set_tx_lo_freq(double freq){
+    _tx_lo_freq = set_lo_freq(dboard_iface::UNIT_TX, freq);
 }
 
 double rfx_xcvr::set_lo_freq(
@@ -258,8 +296,8 @@ double rfx_xcvr::set_lo_freq(
         (8, adf4360_regs_t::BAND_SELECT_CLOCK_DIV_8)
     ;
 
-    double actual_freq, ref_freq = this->get_iface()->get_clock_rate(unit);
-    int R, BS, P, B, A;
+    double actual_freq=0, ref_freq = this->get_iface()->get_clock_rate(unit);
+    int R=0, BS=0, P=0, B=0, A=0;
 
     /*
      * The goal here to to loop though possible R dividers,
@@ -364,12 +402,12 @@ void rfx_xcvr::rx_get(const wax::obj &key_, wax::obj &val){
         return;
 
     case SUBDEV_PROP_GAIN_RANGE:
-        UHD_ASSERT_THROW(name == "PGA0");
-        val = gain_range_t(0, _max_rx_pga0_gain, float(0.022));
+        assert_has(rfx_rx_gain_ranges.keys(), name, "rfx rx gain name");
+        val = rfx_rx_gain_ranges[name];
         return;
 
     case SUBDEV_PROP_GAIN_NAMES:
-        val = prop_names_t(1, "PGA0");
+        val = prop_names_t(rfx_rx_gain_ranges.keys());
         return;
 
     case SUBDEV_PROP_FREQ:
@@ -384,10 +422,8 @@ void rfx_xcvr::rx_get(const wax::obj &key_, wax::obj &val){
         val = _rx_ant;
         return;
 
-    case SUBDEV_PROP_ANTENNA_NAMES:{
-            prop_names_t ants = list_of("TX/RX")("RX2");
-            val = ants;
-        }
+    case SUBDEV_PROP_ANTENNA_NAMES:
+        val = rfx_rx_antennas;
         return;
 
     case SUBDEV_PROP_QUADRATURE:
@@ -422,16 +458,15 @@ void rfx_xcvr::rx_set(const wax::obj &key_, const wax::obj &val){
     switch(key.as<subdev_prop_t>()){
 
     case SUBDEV_PROP_FREQ:
-        set_rx_lo_freq(val.as<double>());
+        this->set_rx_lo_freq(val.as<double>());
         return;
 
     case SUBDEV_PROP_GAIN:
-        UHD_ASSERT_THROW(name == "PGA0");
-        set_rx_pga0_gain(val.as<float>());
+        this->set_rx_gain(val.as<float>(), name);
         return;
 
     case SUBDEV_PROP_ANTENNA:
-        set_rx_ant(val.as<std::string>());
+        this->set_rx_ant(val.as<std::string>());
         return;
 
     default: UHD_THROW_PROP_SET_ERROR();
@@ -456,15 +491,13 @@ void rfx_xcvr::tx_get(const wax::obj &key_, wax::obj &val){
         return;
 
     case SUBDEV_PROP_GAIN:
-        val = float(0);
-        return;
-
     case SUBDEV_PROP_GAIN_RANGE:
-        val = gain_range_t(0, 0, 0);
+        assert_has(rfx_tx_gain_ranges.keys(), name, "rfx tx gain name");
+        //no controllable tx gains, will not get here
         return;
 
     case SUBDEV_PROP_GAIN_NAMES:
-        val = prop_names_t(); //empty
+        val = prop_names_t(rfx_tx_gain_ranges.keys());
         return;
 
     case SUBDEV_PROP_FREQ:
@@ -480,7 +513,7 @@ void rfx_xcvr::tx_get(const wax::obj &key_, wax::obj &val){
         return;
 
     case SUBDEV_PROP_ANTENNA_NAMES:
-        val = prop_names_t(1, "TX/RX");
+        val = rfx_tx_antennas;
         return;
 
     case SUBDEV_PROP_QUADRATURE:
@@ -515,16 +548,15 @@ void rfx_xcvr::tx_set(const wax::obj &key_, const wax::obj &val){
     switch(key.as<subdev_prop_t>()){
 
     case SUBDEV_PROP_FREQ:
-        set_tx_lo_freq(val.as<double>());
+        this->set_tx_lo_freq(val.as<double>());
         return;
 
     case SUBDEV_PROP_GAIN:
-        //no gains to set!
+        this->set_tx_gain(val.as<float>(), name);
         return;
 
     case SUBDEV_PROP_ANTENNA:
-        //its always set to tx/rx, so we only allow this value
-        UHD_ASSERT_THROW(val.as<std::string>() == "TX/RX");
+        this->set_tx_ant(val.as<std::string>());
         return;
 
     default: UHD_THROW_PROP_SET_ERROR();
diff --git a/host/lib/usrp/dboard/db_wbx.cpp b/host/lib/usrp/dboard/db_wbx.cpp
index 2a8a3a9f2..23654860f 100644
--- a/host/lib/usrp/dboard/db_wbx.cpp
+++ b/host/lib/usrp/dboard/db_wbx.cpp
@@ -164,7 +164,9 @@ wbx_xcvr::wbx_xcvr(
     this->get_iface()->set_clock_enabled(dboard_iface::UNIT_TX, true);
     this->get_iface()->set_clock_enabled(dboard_iface::UNIT_RX, true);
 
-    //set the gpio directions
+    //set the gpio directions and atr controls (identically)
+    this->get_iface()->set_pin_ctrl(dboard_iface::UNIT_TX, TXIO_MASK);
+    this->get_iface()->set_pin_ctrl(dboard_iface::UNIT_RX, RXIO_MASK);
     this->get_iface()->set_gpio_ddr(dboard_iface::UNIT_TX, TXIO_MASK);
     this->get_iface()->set_gpio_ddr(dboard_iface::UNIT_RX, RXIO_MASK);
     if (wbx_debug) std::cerr << boost::format(
@@ -303,7 +305,7 @@ double wbx_xcvr::set_lo_freq(
 
     double actual_freq, pfd_freq;
     double ref_freq = this->get_iface()->get_clock_rate(unit);
-    int R, BS, N, FRAC, MOD;
+    int R=0, BS=0, N=0, FRAC=0, MOD=0;
     int RFdiv = 1;
     adf4350_regs_t::reference_divide_by_2_t T     = adf4350_regs_t::REFERENCE_DIVIDE_BY_2_DISABLED;
     adf4350_regs_t::reference_doubler_t     D     = adf4350_regs_t::REFERENCE_DOUBLER_DISABLED;    
diff --git a/host/lib/usrp/dboard/db_xcvr2450.cpp b/host/lib/usrp/dboard/db_xcvr2450.cpp
index 3472229f4..d4d5f184e 100644
--- a/host/lib/usrp/dboard/db_xcvr2450.cpp
+++ b/host/lib/usrp/dboard/db_xcvr2450.cpp
@@ -169,7 +169,9 @@ xcvr2450::xcvr2450(ctor_args_t args) : xcvr_dboard_base(args){
     //enable only the clocks we need
     this->get_iface()->set_clock_enabled(dboard_iface::UNIT_TX, true);
 
-    //set the gpio directions
+    //set the gpio directions and atr controls (identically)
+    this->get_iface()->set_pin_ctrl(dboard_iface::UNIT_TX, TXIO_MASK);
+    this->get_iface()->set_pin_ctrl(dboard_iface::UNIT_RX, RXIO_MASK);
     this->get_iface()->set_gpio_ddr(dboard_iface::UNIT_TX, TXIO_MASK);
     this->get_iface()->set_gpio_ddr(dboard_iface::UNIT_RX, RXIO_MASK);
 
diff --git a/host/lib/usrp/dboard_manager.cpp b/host/lib/usrp/dboard_manager.cpp
index 8161727e5..01352039e 100644
--- a/host/lib/usrp/dboard_manager.cpp
+++ b/host/lib/usrp/dboard_manager.cpp
@@ -298,7 +298,8 @@ void dboard_manager_impl::set_nice_dboard_if(void){
     //set nice settings on each unit
     BOOST_FOREACH(dboard_iface::unit_t unit, units){
         _iface->set_gpio_ddr(unit, 0x0000); //all inputs
-        _iface->set_atr_reg(unit, dboard_iface::ATR_REG_IDLE, 0x0000); //all low
+        _iface->write_gpio(unit, 0x0000); //all low
+        _iface->set_pin_ctrl(unit, 0x0000); //all gpio
         _iface->set_clock_enabled(unit, false); //clock off
     }
 }
diff --git a/host/lib/usrp/simple_usrp.cpp b/host/lib/usrp/simple_usrp.cpp
index a8c104485..f4aa82669 100644
--- a/host/lib/usrp/simple_usrp.cpp
+++ b/host/lib/usrp/simple_usrp.cpp
@@ -121,6 +121,10 @@ public:
         return tune_rx_subdev_and_ddc(_rx_subdev, _rx_dsp, target_freq);
     }
 
+    tune_result_t set_rx_freq(double target_freq, double lo_off){
+        return tune_rx_subdev_and_ddc(_rx_subdev, _rx_dsp, target_freq, lo_off);
+    }
+
     freq_range_t get_rx_freq_range(void){
         return _rx_subdev[SUBDEV_PROP_FREQ_RANGE].as<freq_range_t>();
     }
@@ -168,6 +172,10 @@ public:
         return tune_tx_subdev_and_duc(_tx_subdev, _tx_dsp, target_freq);
     }
 
+    tune_result_t set_tx_freq(double target_freq, double lo_off){
+        return tune_tx_subdev_and_duc(_tx_subdev, _tx_dsp, target_freq, lo_off);
+    }
+
     freq_range_t get_tx_freq_range(void){
         return _tx_subdev[SUBDEV_PROP_FREQ_RANGE].as<freq_range_t>();
     }
diff --git a/host/lib/usrp/usrp2/CMakeLists.txt b/host/lib/usrp/usrp2/CMakeLists.txt
index f9907e21e..99d0b8bdd 100644
--- a/host/lib/usrp/usrp2/CMakeLists.txt
+++ b/host/lib/usrp/usrp2/CMakeLists.txt
@@ -18,12 +18,20 @@
 #This file will be included by cmake, use absolute paths!
 
 LIBUHD_APPEND_SOURCES(
-    ${CMAKE_SOURCE_DIR}/lib/usrp/usrp2/clock_control.cpp
+    ${CMAKE_SOURCE_DIR}/lib/usrp/usrp2/clock_ctrl.cpp
+    ${CMAKE_SOURCE_DIR}/lib/usrp/usrp2/clock_ctrl.hpp
+    ${CMAKE_SOURCE_DIR}/lib/usrp/usrp2/codec_ctrl.cpp
+    ${CMAKE_SOURCE_DIR}/lib/usrp/usrp2/codec_ctrl.hpp
     ${CMAKE_SOURCE_DIR}/lib/usrp/usrp2/dboard_impl.cpp
     ${CMAKE_SOURCE_DIR}/lib/usrp/usrp2/dboard_iface.cpp
     ${CMAKE_SOURCE_DIR}/lib/usrp/usrp2/dsp_impl.cpp
     ${CMAKE_SOURCE_DIR}/lib/usrp/usrp2/io_impl.cpp
     ${CMAKE_SOURCE_DIR}/lib/usrp/usrp2/mboard_impl.cpp
+    ${CMAKE_SOURCE_DIR}/lib/usrp/usrp2/serdes_ctrl.cpp
+    ${CMAKE_SOURCE_DIR}/lib/usrp/usrp2/serdes_ctrl.hpp
     ${CMAKE_SOURCE_DIR}/lib/usrp/usrp2/usrp2_iface.cpp
+    ${CMAKE_SOURCE_DIR}/lib/usrp/usrp2/usrp2_iface.hpp
     ${CMAKE_SOURCE_DIR}/lib/usrp/usrp2/usrp2_impl.cpp
+    ${CMAKE_SOURCE_DIR}/lib/usrp/usrp2/usrp2_impl.hpp
+    ${CMAKE_SOURCE_DIR}/lib/usrp/usrp2/usrp2_regs.hpp
 )
diff --git a/host/lib/usrp/usrp2/clock_control.cpp b/host/lib/usrp/usrp2/clock_ctrl.cpp
index 72f1f1c7a..4c5207203 100644
--- a/host/lib/usrp/usrp2/clock_control.cpp
+++ b/host/lib/usrp/usrp2/clock_ctrl.cpp
@@ -15,21 +15,19 @@
 // along with this program.  If not, see <http://www.gnu.org/licenses/>.
 //
 
-#include "usrp2_impl.hpp"
-#include "clock_control.hpp"
+#include "clock_ctrl.hpp"
 #include "ad9510_regs.hpp"
 #include "usrp2_regs.hpp" //spi slave constants
 #include <boost/cstdint.hpp>
 
 using namespace uhd;
-using namespace uhd::usrp;
 
 /*!
  * A usrp2 clock control specific to the ad9510 ic.
  */
-class clock_control_ad9510 : public clock_control{
+class clock_ctrl_impl : public clock_ctrl{
 public:
-    clock_control_ad9510(usrp2_iface::sptr iface){
+    clock_ctrl_impl(usrp2_iface::sptr iface){
         _iface = iface;
 
         _ad9510_regs.cp_current_setting = ad9510_regs_t::CP_CURRENT_SETTING_3_0MA;
@@ -70,7 +68,7 @@ public:
 
     }
 
-    ~clock_control_ad9510(void){
+    ~clock_ctrl_impl(void){
         /* private clock enables, must be set here */
         this->enable_dac_clock(false);
         this->enable_adc_clock(false);
@@ -81,7 +79,9 @@ public:
         _ad9510_regs.power_down_lvds_cmos_out7 = enb? 0 : 1;
         _ad9510_regs.lvds_cmos_select_out7 = ad9510_regs_t::LVDS_CMOS_SELECT_OUT7_CMOS;
         _ad9510_regs.output_level_lvds_out7 = ad9510_regs_t::OUTPUT_LEVEL_LVDS_OUT7_1_75MA;
+        _ad9510_regs.bypass_divider_out7 = 1;
         this->write_reg(0x43);
+        this->write_reg(0x57);
         this->update_regs();
     }
 
@@ -90,7 +90,9 @@ public:
         _ad9510_regs.power_down_lvds_cmos_out6 = enb? 0 : 1;
         _ad9510_regs.lvds_cmos_select_out6 = ad9510_regs_t::LVDS_CMOS_SELECT_OUT6_CMOS;
         _ad9510_regs.output_level_lvds_out6 = ad9510_regs_t::OUTPUT_LEVEL_LVDS_OUT6_1_75MA;
+        _ad9510_regs.bypass_divider_out6 = 1;
         this->write_reg(0x42);
+        this->write_reg(0x55);
         this->update_regs();
     }
 
@@ -132,7 +134,9 @@ private:
             ad9510_regs_t::POWER_DOWN_LVPECL_OUT3_NORMAL :
             ad9510_regs_t::POWER_DOWN_LVPECL_OUT3_SAFE_PD;
         _ad9510_regs.output_level_lvpecl_out3 = ad9510_regs_t::OUTPUT_LEVEL_LVPECL_OUT3_810MV;
+        _ad9510_regs.bypass_divider_out3 = 1;
         this->write_reg(0x3F);
+        this->write_reg(0x4F);
         this->update_regs();
     }
 
@@ -141,7 +145,9 @@ private:
         _ad9510_regs.power_down_lvds_cmos_out4 = enb? 0 : 1;
         _ad9510_regs.lvds_cmos_select_out4 = ad9510_regs_t::LVDS_CMOS_SELECT_OUT4_LVDS;
         _ad9510_regs.output_level_lvds_out4 = ad9510_regs_t::OUTPUT_LEVEL_LVDS_OUT4_1_75MA;
+        _ad9510_regs.bypass_divider_out4 = 1;
         this->write_reg(0x40);
+        this->write_reg(0x51);
         this->update_regs();
     }
 
@@ -152,6 +158,6 @@ private:
 /***********************************************************************
  * Public make function for the ad9510 clock control
  **********************************************************************/
-clock_control::sptr clock_control::make_ad9510(usrp2_iface::sptr iface){
-    return clock_control::sptr(new clock_control_ad9510(iface));
+clock_ctrl::sptr clock_ctrl::make(usrp2_iface::sptr iface){
+    return sptr(new clock_ctrl_impl(iface));
 }
diff --git a/host/lib/usrp/usrp2/clock_control.hpp b/host/lib/usrp/usrp2/clock_ctrl.hpp
index b64a53196..706bf4246 100644
--- a/host/lib/usrp/usrp2/clock_control.hpp
+++ b/host/lib/usrp/usrp2/clock_ctrl.hpp
@@ -15,23 +15,23 @@
 // along with this program.  If not, see <http://www.gnu.org/licenses/>.
 //
 
-#ifndef INCLUDED_CLOCK_CONTROL_HPP
-#define INCLUDED_CLOCK_CONTROL_HPP
+#ifndef INCLUDED_CLOCK_CTRL_HPP
+#define INCLUDED_CLOCK_CTRL_HPP
 
 #include "usrp2_iface.hpp"
 #include <boost/shared_ptr.hpp>
 #include <boost/utility.hpp>
 
-class clock_control : boost::noncopyable{
+class clock_ctrl : boost::noncopyable{
 public:
-    typedef boost::shared_ptr<clock_control> sptr;
+    typedef boost::shared_ptr<clock_ctrl> sptr;
 
     /*!
      * Make a clock config for the ad9510 ic.
      * \param _iface a pointer to the usrp2 interface object
      * \return a new clock control object
      */
-    static sptr make_ad9510(usrp2_iface::sptr iface);
+    static sptr make(usrp2_iface::sptr iface);
 
     /*!
      * Enable/disable the rx dboard clock.
@@ -57,4 +57,4 @@ public:
 
 };
 
-#endif /* INCLUDED_CLOCK_CONTROL_HPP */
+#endif /* INCLUDED_CLOCK_CTRL_HPP */
diff --git a/host/lib/usrp/usrp2/codec_ctrl.cpp b/host/lib/usrp/usrp2/codec_ctrl.cpp
new file mode 100644
index 000000000..d698216ba
--- /dev/null
+++ b/host/lib/usrp/usrp2/codec_ctrl.cpp
@@ -0,0 +1,91 @@
+//
+// 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 "codec_ctrl.hpp"
+#include "ad9777_regs.hpp"
+#include "usrp2_regs.hpp"
+#include <boost/cstdint.hpp>
+#include <boost/foreach.hpp>
+#include <iostream>
+
+static const bool codec_ctrl_debug = false;
+
+using namespace uhd;
+
+/*!
+ * A usrp2 codec control specific to the ad9777 ic.
+ */
+class codec_ctrl_impl : public codec_ctrl{
+public:
+    codec_ctrl_impl(usrp2_iface::sptr iface){
+        _iface = iface;
+
+        //setup the ad9777 dac
+        _ad9777_regs.x_1r_2r_mode = ad9777_regs_t::X_1R_2R_MODE_1R;
+        _ad9777_regs.filter_interp_rate = ad9777_regs_t::FILTER_INTERP_RATE_4X;
+        _ad9777_regs.mix_mode = ad9777_regs_t::MIX_MODE_REAL;
+        _ad9777_regs.pll_divide_ratio = ad9777_regs_t::PLL_DIVIDE_RATIO_DIV1;
+        _ad9777_regs.pll_state = ad9777_regs_t::PLL_STATE_ON;
+        _ad9777_regs.auto_cp_control = ad9777_regs_t::AUTO_CP_CONTROL_AUTO;
+        //I dac values
+        _ad9777_regs.idac_fine_gain_adjust = 0;
+        _ad9777_regs.idac_coarse_gain_adjust = 0xf;
+        _ad9777_regs.idac_offset_adjust_lsb = 0;
+        _ad9777_regs.idac_offset_adjust_msb = 0;
+        //Q dac values
+        _ad9777_regs.qdac_fine_gain_adjust = 0;
+        _ad9777_regs.qdac_coarse_gain_adjust = 0xf;
+        _ad9777_regs.qdac_offset_adjust_lsb = 0;
+        _ad9777_regs.qdac_offset_adjust_msb = 0;
+        //write all regs
+        for(boost::uint8_t addr = 0; addr <= 0xC; addr++){
+            this->send_ad9777_reg(addr);
+        }
+
+        //power-up adc
+        _iface->poke32(FR_MISC_CTRL_ADC, FRF_MISC_CTRL_ADC_ON);
+    }
+
+    ~codec_ctrl_impl(void){
+        //power-down dac
+        _ad9777_regs.power_down_mode = 1;
+        this->send_ad9777_reg(0);
+
+        //power-down adc
+        _iface->poke32(FR_MISC_CTRL_ADC, FRF_MISC_CTRL_ADC_OFF);
+    }
+
+private:
+    ad9777_regs_t _ad9777_regs;
+    usrp2_iface::sptr _iface;
+
+    void send_ad9777_reg(boost::uint8_t addr){
+        boost::uint16_t reg = _ad9777_regs.get_write_reg(addr);
+        if (codec_ctrl_debug) std::cout << "send_ad9777_reg: " << std::hex << reg << std::endl;
+        _iface->transact_spi(
+            SPI_SS_AD9777, spi_config_t::EDGE_RISE,
+            reg, 16, false /*no rb*/
+        );
+    }
+};
+
+/***********************************************************************
+ * Public make function for the usrp2 codec control
+ **********************************************************************/
+codec_ctrl::sptr codec_ctrl::make(usrp2_iface::sptr iface){
+    return sptr(new codec_ctrl_impl(iface));
+}
diff --git a/host/lib/usrp/usrp2/codec_ctrl.hpp b/host/lib/usrp/usrp2/codec_ctrl.hpp
new file mode 100644
index 000000000..0ee52f476
--- /dev/null
+++ b/host/lib/usrp/usrp2/codec_ctrl.hpp
@@ -0,0 +1,38 @@
+//
+// 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_CODEC_CTRL_HPP
+#define INCLUDED_CODEC_CTRL_HPP
+
+#include "usrp2_iface.hpp"
+#include <boost/shared_ptr.hpp>
+#include <boost/utility.hpp>
+
+class codec_ctrl : boost::noncopyable{
+public:
+    typedef boost::shared_ptr<codec_ctrl> sptr;
+
+    /*!
+     * Make a codec control for the DAC and ADC.
+     * \param _iface a pointer to the usrp2 interface object
+     * \return a new codec control object
+     */
+    static sptr make(usrp2_iface::sptr iface);
+
+};
+
+#endif /* INCLUDED_CODEC_CTRL_HPP */
diff --git a/host/lib/usrp/usrp2/dboard_iface.cpp b/host/lib/usrp/usrp2/dboard_iface.cpp
index 372a5af07..0a2e4b550 100644
--- a/host/lib/usrp/usrp2/dboard_iface.cpp
+++ b/host/lib/usrp/usrp2/dboard_iface.cpp
@@ -16,7 +16,7 @@
 //
 
 #include "usrp2_iface.hpp"
-#include "clock_control.hpp"
+#include "clock_ctrl.hpp"
 #include "usrp2_regs.hpp" //wishbone address constants
 #include <uhd/usrp/dboard_iface.hpp>
 #include <uhd/types/dict.hpp>
@@ -33,14 +33,16 @@ using namespace boost::assign;
 
 class usrp2_dboard_iface : public dboard_iface{
 public:
-    usrp2_dboard_iface(usrp2_iface::sptr iface, clock_control::sptr clk_ctrl);
+    usrp2_dboard_iface(usrp2_iface::sptr iface, clock_ctrl::sptr clock_ctrl);
     ~usrp2_dboard_iface(void);
 
     void write_aux_dac(unit_t, int, float);
     float read_aux_adc(unit_t, int);
 
+    void set_pin_ctrl(unit_t, boost::uint16_t);
     void set_atr_reg(unit_t, atr_reg_t, boost::uint16_t);
     void set_gpio_ddr(unit_t, boost::uint16_t);
+    void write_gpio(unit_t, boost::uint16_t);
     boost::uint16_t read_gpio(unit_t);
 
     void write_i2c(boost::uint8_t, const byte_vector_t &);
@@ -66,8 +68,9 @@ public:
 
 private:
     usrp2_iface::sptr _iface;
-    clock_control::sptr _clk_ctrl;
+    clock_ctrl::sptr _clock_ctrl;
     boost::uint32_t _ddr_shadow;
+    boost::uint32_t _gpio_shadow;
 
     uhd::dict<unit_t, ad5624_regs_t> _dac_regs;
     void _write_aux_dac(unit_t);
@@ -78,26 +81,19 @@ private:
  **********************************************************************/
 dboard_iface::sptr make_usrp2_dboard_iface(
     usrp2_iface::sptr iface,
-    clock_control::sptr clk_ctrl
+    clock_ctrl::sptr clock_ctrl
 ){
-    return dboard_iface::sptr(new usrp2_dboard_iface(iface, clk_ctrl));
+    return dboard_iface::sptr(new usrp2_dboard_iface(iface, clock_ctrl));
 }
 
 /***********************************************************************
  * Structors
  **********************************************************************/
-usrp2_dboard_iface::usrp2_dboard_iface(usrp2_iface::sptr iface, clock_control::sptr clk_ctrl){
+usrp2_dboard_iface::usrp2_dboard_iface(usrp2_iface::sptr iface, clock_ctrl::sptr clock_ctrl){
     _iface = iface;
-    _clk_ctrl = clk_ctrl;
+    _clock_ctrl = clock_ctrl;
     _ddr_shadow = 0;
-
-    //set the selection mux to use atr
-    boost::uint32_t new_sels = 0x0;
-    for(size_t i = 0; i < 16; i++){
-        new_sels |= FRF_GPIO_SEL_ATR << (i*2);
-    }
-    _iface->poke32(FR_GPIO_TX_SEL, new_sels);
-    _iface->poke32(FR_GPIO_RX_SEL, new_sels);
+    _gpio_shadow = 0;
 
     //reset the aux dacs
     _dac_regs[UNIT_RX] = ad5624_regs_t();
@@ -123,8 +119,8 @@ double usrp2_dboard_iface::get_clock_rate(unit_t){
 
 void usrp2_dboard_iface::set_clock_enabled(unit_t unit, bool enb){
     switch(unit){
-    case UNIT_RX: _clk_ctrl->enable_rx_dboard_clock(enb); return;
-    case UNIT_TX: _clk_ctrl->enable_tx_dboard_clock(enb); return;
+    case UNIT_RX: _clock_ctrl->enable_rx_dboard_clock(enb); return;
+    case UNIT_TX: _clock_ctrl->enable_tx_dboard_clock(enb); return;
     }
 }
 
@@ -136,6 +132,21 @@ static const uhd::dict<dboard_iface::unit_t, int> unit_to_shift = map_list_of
     (dboard_iface::UNIT_TX, 16)
 ;
 
+void usrp2_dboard_iface::set_pin_ctrl(unit_t unit, boost::uint16_t value){
+    //calculate the new selection mux setting
+    boost::uint32_t new_sels = 0x0;
+    for(size_t i = 0; i < 16; i++){
+        bool is_bit_set = bool(value & (0x1 << i));
+        new_sels |= ((is_bit_set)? FRF_GPIO_SEL_ATR : FRF_GPIO_SEL_GPIO) << (i*2);
+    }
+
+    //write the selection mux value to register
+    switch(unit){
+    case UNIT_RX: _iface->poke32(FR_GPIO_RX_SEL, new_sels); return;
+    case UNIT_TX: _iface->poke32(FR_GPIO_TX_SEL, new_sels); return;
+    }
+}
+
 void usrp2_dboard_iface::set_gpio_ddr(unit_t unit, boost::uint16_t value){
     _ddr_shadow = \
         (_ddr_shadow & ~(0xffff << unit_to_shift[unit])) |
@@ -143,6 +154,13 @@ void usrp2_dboard_iface::set_gpio_ddr(unit_t unit, boost::uint16_t value){
     _iface->poke32(FR_GPIO_DDR, _ddr_shadow);
 }
 
+void usrp2_dboard_iface::write_gpio(unit_t unit, boost::uint16_t value){
+    _gpio_shadow = \
+        (_gpio_shadow & ~(0xffff << unit_to_shift[unit])) |
+        (boost::uint32_t(value) << unit_to_shift[unit]);
+    _iface->poke32(FR_GPIO_IO, _gpio_shadow);
+}
+
 boost::uint16_t usrp2_dboard_iface::read_gpio(unit_t unit){
     return boost::uint16_t(_iface->peek32(FR_GPIO_IO) >> unit_to_shift[unit]);
 }
diff --git a/host/lib/usrp/usrp2/dboard_impl.cpp b/host/lib/usrp/usrp2/dboard_impl.cpp
index 403faf5cf..0ac39d2a3 100644
--- a/host/lib/usrp/usrp2/dboard_impl.cpp
+++ b/host/lib/usrp/usrp2/dboard_impl.cpp
@@ -38,9 +38,7 @@ void usrp2_impl::dboard_init(void){
     _tx_db_eeprom = dboard_eeprom_t(_iface->read_eeprom(I2C_ADDR_TX_DB, 0, dboard_eeprom_t::num_bytes()));
 
     //create a new dboard interface and manager
-    dboard_iface::sptr _dboard_iface(
-        make_usrp2_dboard_iface(_iface, _clk_ctrl)
-    );
+    _dboard_iface = make_usrp2_dboard_iface(_iface, _clock_ctrl);
     _dboard_manager = dboard_manager::make(
         _rx_db_eeprom.id, _tx_db_eeprom.id, _dboard_iface
     );
@@ -123,6 +121,10 @@ void usrp2_impl::rx_dboard_get(const wax::obj &key_, wax::obj &val){
         val = _rx_db_eeprom.id;
         return;
 
+    case DBOARD_PROP_DBOARD_IFACE:
+        val = _dboard_iface;
+        return;
+
     default: UHD_THROW_PROP_GET_ERROR();
     }
 }
@@ -172,6 +174,10 @@ void usrp2_impl::tx_dboard_get(const wax::obj &key_, wax::obj &val){
         val = _tx_db_eeprom.id;
         return;
 
+    case DBOARD_PROP_DBOARD_IFACE:
+        val = _dboard_iface;
+        return;
+
     default: UHD_THROW_PROP_GET_ERROR();
     }
 }
diff --git a/host/lib/usrp/usrp2/dsp_impl.cpp b/host/lib/usrp/usrp2/dsp_impl.cpp
index fc4c5479e..195a9bc53 100644
--- a/host/lib/usrp/usrp2/dsp_impl.cpp
+++ b/host/lib/usrp/usrp2/dsp_impl.cpp
@@ -94,9 +94,6 @@ void usrp2_impl::init_ddc_config(void){
     _ddc_decim = default_decim;
     _ddc_freq = 0;
     update_ddc_config();
-
-    //initial command that kills streaming (in case if was left on)
-    issue_ddc_stream_cmd(stream_cmd_t::STREAM_MODE_STOP_CONTINUOUS);
 }
 
 void usrp2_impl::update_ddc_config(void){
diff --git a/host/lib/usrp/usrp2/fw_common.h b/host/lib/usrp/usrp2/fw_common.h
index e80001ff2..75f5b1779 100644
--- a/host/lib/usrp/usrp2/fw_common.h
+++ b/host/lib/usrp/usrp2/fw_common.h
@@ -34,7 +34,7 @@ extern "C" {
 
 //defines the protocol version in this shared header
 //increment this value when the protocol is changed
-#define USRP2_PROTO_VERSION 2
+#define USRP2_PROTO_VERSION 3
 
 //used to differentiate control packets over data port
 #define USRP2_INVALID_VRT_HEADER 0
@@ -53,13 +53,8 @@ typedef enum{
     //USRP2_CTRL_ID_FOR_SURE, //TODO error condition enums
     //USRP2_CTRL_ID_SUX_MAN,
 
-    USRP2_CTRL_ID_GIVE_ME_YOUR_IP_ADDR_BRO = 'a',
-    USRP2_CTRL_ID_THIS_IS_MY_IP_ADDR_DUDE = 'A',
-    USRP2_CTRL_ID_HERE_IS_A_NEW_IP_ADDR_BRO = 'b',
-
-    USRP2_CTRL_ID_GIVE_ME_YOUR_MAC_ADDR_BRO = 'm',
-    USRP2_CTRL_ID_THIS_IS_MY_MAC_ADDR_DUDE = 'M',
-    USRP2_CTRL_ID_HERE_IS_A_NEW_MAC_ADDR_BRO = 'n',
+    USRP2_CTRL_ID_WAZZUP_BRO = 'a',
+    USRP2_CTRL_ID_WAZZUP_DUDE = 'A',
 
     USRP2_CTRL_ID_TRANSACT_ME_SOME_SPI_BRO = 's',
     USRP2_CTRL_ID_OMG_TRANSACTED_SPI_DUDE = 'S',
@@ -70,9 +65,6 @@ typedef enum{
     USRP2_CTRL_ID_WRITE_THESE_I2C_VALUES_BRO = 'h',
     USRP2_CTRL_ID_COOL_IM_DONE_I2C_WRITE_DUDE = 'H',
 
-    USRP2_CTRL_ID_SEND_STREAM_COMMAND_FOR_ME_BRO = '{',
-    USRP2_CTRL_ID_GOT_THAT_STREAM_COMMAND_DUDE = '}',
-
     USRP2_CTRL_ID_POKE_THIS_REGISTER_FOR_ME_BRO = 'p',
     USRP2_CTRL_ID_OMG_POKED_REGISTER_SO_BAD_DUDE = 'P',
 
@@ -99,7 +91,6 @@ typedef struct{
     _SINS_ uint32_t seq;
     union{
         _SINS_ uint32_t ip_addr;
-        _SINS_ uint8_t mac_addr[6];
         struct {
             _SINS_ uint8_t dev;
             _SINS_ uint8_t miso_edge;
@@ -114,15 +105,6 @@ typedef struct{
             _SINS_ uint8_t data[sizeof(_SINS_ uint32_t)];
         } i2c_args;
         struct {
-            _SINS_ uint8_t now; //stream now?
-            _SINS_ uint8_t continuous; //auto-reload commmands?
-            _SINS_ uint8_t chain;
-            _SINS_ uint8_t _pad[1];
-            _SINS_ uint32_t secs;
-            _SINS_ uint32_t ticks;
-            _SINS_ uint32_t num_samps;
-        } stream_cmd;
-        struct {
             _SINS_ uint32_t addr;
             _SINS_ uint32_t data;
             _SINS_ uint8_t num_bytes; //1, 2, 4
diff --git a/host/lib/usrp/usrp2/io_impl.cpp b/host/lib/usrp/usrp2/io_impl.cpp
index 2634e84aa..79b18fb63 100644
--- a/host/lib/usrp/usrp2/io_impl.cpp
+++ b/host/lib/usrp/usrp2/io_impl.cpp
@@ -16,6 +16,7 @@
 //
 
 #include "usrp2_impl.hpp"
+#include "usrp2_regs.hpp"
 #include <uhd/transport/convert_types.hpp>
 #include <boost/format.hpp>
 #include <boost/asio.hpp> //htonl and ntohl
@@ -30,71 +31,35 @@ namespace asio = boost::asio;
  * Helper Functions
  **********************************************************************/
 void usrp2_impl::io_init(void){
-    //setup otw type
-    _otw_type.width = 16;
-    _otw_type.shift = 0;
-    _otw_type.byteorder = otw_type_t::BO_BIG_ENDIAN;
+    //setup rx otw type
+    _rx_otw_type.width = 16;
+    _rx_otw_type.shift = 0;
+    _rx_otw_type.byteorder = otw_type_t::BO_BIG_ENDIAN;
 
-    //initially empty copy buffer
-    _rx_copy_buff = asio::buffer("", 0);
-
-    //init the expected rx seq number
-    _rx_stream_id_to_packet_seq[0] = 0;
+    //setup tx otw type
+    _tx_otw_type.width = 16;
+    _tx_otw_type.shift = 0;
+    _tx_otw_type.byteorder = otw_type_t::BO_BIG_ENDIAN;
 
     //send a small data packet so the usrp2 knows the udp source port
-    //and the maximum number of lines (32 bit words) per packet
     managed_send_buffer::sptr send_buff = _data_transport->get_send_buff();
-    boost::uint32_t data[2] = {
-        htonl(USRP2_INVALID_VRT_HEADER),
-        htonl(_max_rx_samples_per_packet)
-    };
-    memcpy(send_buff->cast<void*>(), data, sizeof(data));
-    send_buff->done(sizeof(data));
-}
-
-/***********************************************************************
- * Receive Raw Data
- **********************************************************************/
-void usrp2_impl::recv_raw(rx_metadata_t &metadata){
-    //do a receive
-    _rx_smart_buff = _data_transport->get_recv_buff();
-
-    //unpack the vrt header
-    size_t num_packet_words32 = _rx_smart_buff->size()/sizeof(boost::uint32_t);
-    if (num_packet_words32 == 0){
-        _rx_copy_buff = boost::asio::buffer("", 0);
-        return; //must exit here after setting the buffer
-    }
-    const boost::uint32_t *vrt_hdr = _rx_smart_buff->cast<const boost::uint32_t *>();
-    size_t num_header_words32_out, num_payload_words32_out, packet_count_out;
-    try{
-        vrt::unpack(
-            metadata,                //output
-            vrt_hdr,                 //input
-            num_header_words32_out,  //output
-            num_payload_words32_out, //output
-            num_packet_words32,      //input
-            packet_count_out,        //output
-            get_master_clock_freq()
-        );
-    }catch(const std::exception &e){
-        std::cerr << "bad vrt header: " << e.what() << std::endl;
-        _rx_copy_buff = boost::asio::buffer("", 0);
-        return; //must exit here after setting the buffer
-    }
-
-    //handle the packet count / sequence number
-    size_t expected_packet_count = _rx_stream_id_to_packet_seq[metadata.stream_id];
-    if (packet_count_out != expected_packet_count){
-        std::cerr << "S" << (packet_count_out - expected_packet_count)%16;
-    }
-    _rx_stream_id_to_packet_seq[metadata.stream_id] = (packet_count_out+1)%16;
-
-    //setup the rx buffer to point to the data
-    _rx_copy_buff = asio::buffer(
-        vrt_hdr + num_header_words32_out,
-        num_payload_words32_out*sizeof(boost::uint32_t)
+    boost::uint32_t data = htonl(USRP2_INVALID_VRT_HEADER);
+    memcpy(send_buff->cast<void*>(), &data, sizeof(data));
+    send_buff->commit(sizeof(data));
+
+    //setup RX DSP regs
+    std::cout << "RX samples per packet: " << get_max_recv_samps_per_packet() << std::endl;
+    _iface->poke32(FR_RX_CTRL_NSAMPS_PER_PKT, get_max_recv_samps_per_packet());
+    _iface->poke32(FR_RX_CTRL_NCHANNELS, 1);
+    _iface->poke32(FR_RX_CTRL_CLEAR_OVERRUN, 1); //reset
+    _iface->poke32(FR_RX_CTRL_VRT_HEADER, 0
+        | (0x1 << 28) //if data with stream id
+        | (0x1 << 26) //has trailer
+        | (0x3 << 22) //integer time other
+        | (0x1 << 20) //fractional time sample count
     );
+    _iface->poke32(FR_RX_CTRL_VRT_STREAM_ID, 0);
+    _iface->poke32(FR_RX_CTRL_VRT_TRAILER, 0);
 }
 
 /***********************************************************************
@@ -102,49 +67,18 @@ void usrp2_impl::recv_raw(rx_metadata_t &metadata){
  **********************************************************************/
 size_t usrp2_impl::send(
     const asio::const_buffer &buff,
-    const tx_metadata_t &metadata_,
-    const io_type_t &io_type
+    const tx_metadata_t &metadata,
+    const io_type_t &io_type,
+    send_mode_t send_mode
 ){
-    tx_metadata_t metadata = metadata_; //rw copy to change later
-
-    transport::managed_send_buffer::sptr send_buff = _data_transport->get_send_buff();
-    boost::uint32_t *tx_mem = send_buff->cast<boost::uint32_t *>();
-    size_t num_samps = std::min(std::min(
-        asio::buffer_size(buff)/io_type.size,
-        size_t(_max_tx_samples_per_packet)),
-        send_buff->size()/io_type.size
-    );
-
-    //kill the end of burst flag if this is a fragment
-    if (asio::buffer_size(buff)/io_type.size < num_samps)
-        metadata.end_of_burst = false;
-
-    size_t num_header_words32, num_packet_words32;
-    size_t packet_count = _tx_stream_id_to_packet_seq[metadata.stream_id]++;
-
-    //pack metadata into a vrt header
-    vrt::pack(
-        metadata,            //input
-        tx_mem,              //output
-        num_header_words32,  //output
-        num_samps,           //input
-        num_packet_words32,  //output
-        packet_count,        //input
-        get_master_clock_freq()
-    );
-
-    boost::uint32_t *items = tx_mem + num_header_words32; //offset for data
-
-    //copy-convert the samples into the send buffer
-    convert_io_type_to_otw_type(
-        asio::buffer_cast<const void*>(buff), io_type,
-        (void*)items, _otw_type,
-        num_samps
+    return vrt_packet_handler::send(
+        _packet_handler_send_state, //last state of the send handler
+        buff, metadata, send_mode,  //buffer to empty and samples metadata
+        io_type, _tx_otw_type,      //input and output types to convert
+        get_master_clock_freq(),    //master clock tick rate
+        _data_transport,            //zero copy interface
+        get_max_send_samps_per_packet()
     );
-
-    //send and return number of samples
-    send_buff->done(num_packet_words32*sizeof(boost::uint32_t));
-    return num_samps;
 }
 
 /***********************************************************************
@@ -153,44 +87,14 @@ size_t usrp2_impl::send(
 size_t usrp2_impl::recv(
     const asio::mutable_buffer &buff,
     rx_metadata_t &metadata,
-    const io_type_t &io_type
+    const io_type_t &io_type,
+    recv_mode_t recv_mode
 ){
-    //perform a receive if no rx data is waiting to be copied
-    if (asio::buffer_size(_rx_copy_buff) == 0){
-        _fragment_offset_in_samps = 0;
-        recv_raw(metadata);
-    }
-    //otherwise flag the metadata to show that is is a fragment
-    else{
-        metadata = rx_metadata_t();
-    }
-
-    //extract the number of samples available to copy
-    //and a pointer into the usrp2 received items memory
-    size_t bytes_to_copy = asio::buffer_size(_rx_copy_buff);
-    if (bytes_to_copy == 0) return 0; //nothing to receive
-    size_t num_samps = std::min(
-        asio::buffer_size(buff)/io_type.size,
-        bytes_to_copy/sizeof(boost::uint32_t)
+    return vrt_packet_handler::recv(
+        _packet_handler_recv_state, //last state of the recv handler
+        buff, metadata, recv_mode,  //buffer to fill and samples metadata
+        io_type, _rx_otw_type,      //input and output types to convert
+        get_master_clock_freq(),    //master clock tick rate
+        _data_transport             //zero copy interface
     );
-    const boost::uint32_t *items = asio::buffer_cast<const boost::uint32_t*>(_rx_copy_buff);
-
-    //setup the fragment flags and offset
-    metadata.more_fragments = asio::buffer_size(buff)/io_type.size < num_samps;
-    metadata.fragment_offset = _fragment_offset_in_samps;
-    _fragment_offset_in_samps += num_samps; //set for next time
-
-    //copy-convert the samples from the recv buffer
-    convert_otw_type_to_io_type(
-        (const void*)items, _otw_type,
-        asio::buffer_cast<void*>(buff), io_type,
-        num_samps
-    );
-
-    //update the rx copy buffer to reflect the bytes copied
-    _rx_copy_buff = asio::buffer(
-        items + num_samps, bytes_to_copy - num_samps*sizeof(boost::uint32_t)
-    );
-
-    return num_samps;
 }
diff --git a/host/lib/usrp/usrp2/mboard_impl.cpp b/host/lib/usrp/usrp2/mboard_impl.cpp
index 36bef4f25..a2aeadf16 100644
--- a/host/lib/usrp/usrp2/mboard_impl.cpp
+++ b/host/lib/usrp/usrp2/mboard_impl.cpp
@@ -17,13 +17,13 @@
 
 #include "usrp2_impl.hpp"
 #include "usrp2_regs.hpp"
-#include "ad9777_regs.hpp"
 #include <uhd/usrp/mboard_props.hpp>
 #include <uhd/utils/assert.hpp>
+#include <uhd/utils/algorithm.hpp>
 #include <uhd/types/mac_addr.hpp>
 #include <uhd/types/dict.hpp>
 #include <boost/bind.hpp>
-#include <boost/asio.hpp> //htonl and ntohl
+#include <boost/asio/ip/address_v4.hpp>
 #include <boost/assign/list_of.hpp>
 
 using namespace uhd;
@@ -37,32 +37,6 @@ void usrp2_impl::mboard_init(void){
         boost::bind(&usrp2_impl::mboard_get, this, _1, _2),
         boost::bind(&usrp2_impl::mboard_set, this, _1, _2)
     );
-
-    _clk_ctrl = clock_control::make_ad9510(_iface);
-
-    //setup the ad9777 dac
-    ad9777_regs_t ad9777_regs;
-    ad9777_regs.x_1r_2r_mode = ad9777_regs_t::X_1R_2R_MODE_1R;
-    ad9777_regs.filter_interp_rate = ad9777_regs_t::FILTER_INTERP_RATE_4X;
-    ad9777_regs.mix_mode = ad9777_regs_t::MIX_MODE_REAL;
-    ad9777_regs.pll_divide_ratio = ad9777_regs_t::PLL_DIVIDE_RATIO_DIV1;
-    ad9777_regs.pll_state = ad9777_regs_t::PLL_STATE_OFF;
-    ad9777_regs.auto_cp_control = ad9777_regs_t::AUTO_CP_CONTROL_ENB;
-    //I dac values
-    ad9777_regs.idac_fine_gain_adjust = 0;
-    ad9777_regs.idac_coarse_gain_adjust = 0xf;
-    ad9777_regs.idac_offset_adjust_lsb = 0;
-    ad9777_regs.idac_offset_adjust_msb = 0;
-    //Q dac values
-    ad9777_regs.qdac_fine_gain_adjust = 0;
-    ad9777_regs.qdac_coarse_gain_adjust = 0xf;
-    ad9777_regs.qdac_offset_adjust_lsb = 0;
-    ad9777_regs.qdac_offset_adjust_msb = 0;
-    //write all regs
-    for(boost::uint8_t addr = 0; addr <= 0xC; addr++){
-        boost::uint16_t data = ad9777_regs.get_write_reg(addr);
-        _iface->transact_spi(SPI_SS_AD9777, spi_config_t::EDGE_RISE, data, 16, false /*no rb*/);
-    }
 }
 
 void usrp2_impl::init_clock_config(void){
@@ -97,62 +71,55 @@ void usrp2_impl::update_clock_config(void){
 
     //clock source ref 10mhz
     switch(_clock_config.ref_source){
-    case clock_config_t::REF_INT : _iface->poke32(FR_CLOCK_CONTROL, 0x10); break;
-    case clock_config_t::REF_SMA : _iface->poke32(FR_CLOCK_CONTROL, 0x1C); break;
-    case clock_config_t::REF_MIMO: _iface->poke32(FR_CLOCK_CONTROL, 0x15); break;
+    case clock_config_t::REF_INT : _iface->poke32(FR_MISC_CTRL_CLOCK, 0x10); break;
+    case clock_config_t::REF_SMA : _iface->poke32(FR_MISC_CTRL_CLOCK, 0x1C); break;
+    case clock_config_t::REF_MIMO: _iface->poke32(FR_MISC_CTRL_CLOCK, 0x15); break;
     default: throw std::runtime_error("usrp2: unhandled clock configuration reference source");
     }
 
     //clock source ref 10mhz
     bool use_external = _clock_config.ref_source != clock_config_t::REF_INT;
-    _clk_ctrl->enable_external_ref(use_external);
+    _clock_ctrl->enable_external_ref(use_external);
 }
 
 void usrp2_impl::set_time_spec(const time_spec_t &time_spec, bool now){
-    //set ticks and seconds
-    _iface->poke32(FR_TIME64_SECS, time_spec.secs);
+    //set the ticks
     _iface->poke32(FR_TIME64_TICKS, time_spec.get_ticks(get_master_clock_freq()));
 
-    //set the register to latch it all in
+    //set the flags register
     boost::uint32_t imm_flags = (now)? FRF_TIME64_LATCH_NOW : FRF_TIME64_LATCH_NEXT_PPS;
     _iface->poke32(FR_TIME64_IMM, imm_flags);
+
+    //set the seconds (latches in all 3 registers)
+    _iface->poke32(FR_TIME64_SECS, time_spec.secs);
 }
 
 void usrp2_impl::issue_ddc_stream_cmd(const stream_cmd_t &stream_cmd){
-    //setup the out data
-    usrp2_ctrl_data_t out_data;
-    out_data.id = htonl(USRP2_CTRL_ID_SEND_STREAM_COMMAND_FOR_ME_BRO);
-    out_data.data.stream_cmd.now = (stream_cmd.stream_now)? 1 : 0;
-    out_data.data.stream_cmd.secs = htonl(stream_cmd.time_spec.secs);
-    out_data.data.stream_cmd.ticks = htonl(stream_cmd.time_spec.get_ticks(get_master_clock_freq()));
-
-    //set these to defaults, then change in the switch statement
-    out_data.data.stream_cmd.continuous = 0;
-    out_data.data.stream_cmd.chain = 0;
-    out_data.data.stream_cmd.num_samps = htonl(stream_cmd.num_samps);
-
-    //setup chain, num samps, and continuous below
-    switch(stream_cmd.stream_mode){
-    case stream_cmd_t::STREAM_MODE_START_CONTINUOUS:
-        out_data.data.stream_cmd.continuous = 1;
-        break;
-
-    case stream_cmd_t::STREAM_MODE_STOP_CONTINUOUS:
-        out_data.data.stream_cmd.num_samps = htonl(0);
-        break;
-
-    case stream_cmd_t::STREAM_MODE_NUM_SAMPS_AND_DONE:
-        //all set by defaults above
-        break;
-
-    case stream_cmd_t::STREAM_MODE_NUM_SAMPS_AND_MORE:
-        out_data.data.stream_cmd.chain = 1;
-        break;
-    }
-
-    //send and recv
-    usrp2_ctrl_data_t in_data = _iface->ctrl_send_and_recv(out_data);
-    UHD_ASSERT_THROW(htonl(in_data.id) == USRP2_CTRL_ID_GOT_THAT_STREAM_COMMAND_DUDE);
+    UHD_ASSERT_THROW(stream_cmd.num_samps <= FR_RX_CTRL_MAX_SAMPS_PER_CMD);
+
+    //setup the mode to instruction flags
+    typedef boost::tuple<bool, bool, bool> inst_t;
+    static const uhd::dict<stream_cmd_t::stream_mode_t, inst_t> mode_to_inst = boost::assign::map_list_of
+                                                            //reload, chain, samps
+        (stream_cmd_t::STREAM_MODE_START_CONTINUOUS,   inst_t(true,  true,  false))
+        (stream_cmd_t::STREAM_MODE_STOP_CONTINUOUS,    inst_t(false, false, false))
+        (stream_cmd_t::STREAM_MODE_NUM_SAMPS_AND_DONE, inst_t(false, false, true))
+        (stream_cmd_t::STREAM_MODE_NUM_SAMPS_AND_MORE, inst_t(false, true,  true))
+    ;
+
+    //setup the instruction flag values
+    bool inst_reload, inst_chain, inst_samps;
+    boost::tie(inst_reload, inst_chain, inst_samps) = mode_to_inst[stream_cmd.stream_mode];
+
+    //issue the stream command
+    _iface->poke32(FR_RX_CTRL_STREAM_CMD, FR_RX_CTRL_MAKE_CMD(
+        (inst_samps)? stream_cmd.num_samps : ((inst_chain)? get_max_recv_samps_per_packet() : 1),
+        (stream_cmd.stream_now)? 1 : 0,
+        (inst_chain)? 1 : 0,
+        (inst_reload)? 1 : 0
+    ));
+    _iface->poke32(FR_RX_CTRL_TIME_SECS,  stream_cmd.time_spec.secs);
+    _iface->poke32(FR_RX_CTRL_TIME_TICKS, stream_cmd.time_spec.get_ticks(get_master_clock_freq()));
 }
 
 /***********************************************************************
@@ -165,30 +132,15 @@ void usrp2_impl::mboard_get(const wax::obj &key_, wax::obj &val){
     //handle the other props
     if (key.type() == typeid(std::string)){
         if (key.as<std::string>() == "mac-addr"){
-            //setup the out data
-            usrp2_ctrl_data_t out_data;
-            out_data.id = htonl(USRP2_CTRL_ID_GIVE_ME_YOUR_MAC_ADDR_BRO);
-
-            //send and recv
-            usrp2_ctrl_data_t in_data = _iface->ctrl_send_and_recv(out_data);
-            UHD_ASSERT_THROW(htonl(in_data.id) == USRP2_CTRL_ID_THIS_IS_MY_MAC_ADDR_DUDE);
-
-            //extract the address
-            val = mac_addr_t::from_bytes(in_data.data.mac_addr).to_string();
+            byte_vector_t bytes = _iface->read_eeprom(I2C_ADDR_MBOARD, EE_MBOARD_MAC_ADDR, 6);
+            val = mac_addr_t::from_bytes(bytes).to_string();
             return;
         }
 
         if (key.as<std::string>() == "ip-addr"){
-            //setup the out data
-            usrp2_ctrl_data_t out_data;
-            out_data.id = htonl(USRP2_CTRL_ID_GIVE_ME_YOUR_IP_ADDR_BRO);
-
-            //send and recv
-            usrp2_ctrl_data_t in_data = _iface->ctrl_send_and_recv(out_data);
-            UHD_ASSERT_THROW(htonl(in_data.id) == USRP2_CTRL_ID_THIS_IS_MY_IP_ADDR_DUDE);
-
-            //extract the address
-            val = boost::asio::ip::address_v4(ntohl(in_data.data.ip_addr)).to_string();
+            boost::asio::ip::address_v4::bytes_type bytes;
+            std::copy(_iface->read_eeprom(I2C_ADDR_MBOARD, EE_MBOARD_IP_ADDR, 4), bytes);
+            val = boost::asio::ip::address_v4(bytes).to_string();
             return;
         }
     }
@@ -259,27 +211,15 @@ void usrp2_impl::mboard_set(const wax::obj &key, const wax::obj &val){
     //handle the other props
     if (key.type() == typeid(std::string)){
         if (key.as<std::string>() == "mac-addr"){
-            //setup the out data
-            usrp2_ctrl_data_t out_data;
-            out_data.id = htonl(USRP2_CTRL_ID_HERE_IS_A_NEW_MAC_ADDR_BRO);
-            mac_addr_t mac_addr = mac_addr_t::from_string(val.as<std::string>());
-            std::copy(mac_addr.to_bytes(), mac_addr.to_bytes()+mac_addr_t::hlen, out_data.data.mac_addr);
-
-            //send and recv
-            usrp2_ctrl_data_t in_data = _iface->ctrl_send_and_recv(out_data);
-            UHD_ASSERT_THROW(htonl(in_data.id) == USRP2_CTRL_ID_THIS_IS_MY_MAC_ADDR_DUDE);
+            byte_vector_t bytes = mac_addr_t::from_string(val.as<std::string>()).to_bytes();
+            _iface->write_eeprom(I2C_ADDR_MBOARD, EE_MBOARD_MAC_ADDR, bytes);
             return;
         }
 
         if (key.as<std::string>() == "ip-addr"){
-            //setup the out data
-            usrp2_ctrl_data_t out_data;
-            out_data.id = htonl(USRP2_CTRL_ID_HERE_IS_A_NEW_IP_ADDR_BRO);
-            out_data.data.ip_addr = htonl(boost::asio::ip::address_v4::from_string(val.as<std::string>()).to_ulong());
-
-            //send and recv
-            usrp2_ctrl_data_t in_data = _iface->ctrl_send_and_recv(out_data);
-            UHD_ASSERT_THROW(htonl(in_data.id) == USRP2_CTRL_ID_THIS_IS_MY_IP_ADDR_DUDE);
+            byte_vector_t bytes(4);
+            std::copy(boost::asio::ip::address_v4::from_string(val.as<std::string>()).to_bytes(), bytes);
+            _iface->write_eeprom(I2C_ADDR_MBOARD, EE_MBOARD_IP_ADDR, bytes);
             return;
         }
     }
diff --git a/host/lib/usrp/usrp2/serdes_ctrl.cpp b/host/lib/usrp/usrp2/serdes_ctrl.cpp
new file mode 100644
index 000000000..dde22b499
--- /dev/null
+++ b/host/lib/usrp/usrp2/serdes_ctrl.cpp
@@ -0,0 +1,46 @@
+//
+// 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 "serdes_ctrl.hpp"
+#include "usrp2_regs.hpp"
+
+using namespace uhd;
+
+/*!
+ * A usrp2 serdes control implementation
+ */
+class serdes_ctrl_impl : public serdes_ctrl{
+public:
+    serdes_ctrl_impl(usrp2_iface::sptr iface){
+        _iface = iface;
+        _iface->poke32(FR_MISC_CTRL_SERDES, FRF_MISC_CTRL_SERDES_ENABLE | FRF_MISC_CTRL_SERDES_RXEN);
+    }
+
+    ~serdes_ctrl_impl(void){
+        _iface->poke32(FR_MISC_CTRL_SERDES, 0); //power-down
+    }
+
+private:
+    usrp2_iface::sptr _iface;
+};
+
+/***********************************************************************
+ * Public make function for the usrp2 serdes control
+ **********************************************************************/
+serdes_ctrl::sptr serdes_ctrl::make(usrp2_iface::sptr iface){
+    return sptr(new serdes_ctrl_impl(iface));
+}
diff --git a/host/lib/usrp/usrp2/serdes_ctrl.hpp b/host/lib/usrp/usrp2/serdes_ctrl.hpp
new file mode 100644
index 000000000..586238739
--- /dev/null
+++ b/host/lib/usrp/usrp2/serdes_ctrl.hpp
@@ -0,0 +1,40 @@
+//
+// 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_SERDES_CTRL_HPP
+#define INCLUDED_SERDES_CTRL_HPP
+
+#include "usrp2_iface.hpp"
+#include <boost/shared_ptr.hpp>
+#include <boost/utility.hpp>
+
+class serdes_ctrl : boost::noncopyable{
+public:
+    typedef boost::shared_ptr<serdes_ctrl> sptr;
+
+    /*!
+     * Make a serdes control object for the usrp2 serdes port.
+     * \param _iface a pointer to the usrp2 interface object
+     * \return a new serdes control object
+     */
+    static sptr make(usrp2_iface::sptr iface);
+
+    //TODO fill me in with virtual methods
+
+};
+
+#endif /* INCLUDED_SERDES_CTRL_HPP */
diff --git a/host/lib/usrp/usrp2/usrp2_iface.hpp b/host/lib/usrp/usrp2/usrp2_iface.hpp
index 7158c58d0..caf6623e2 100644
--- a/host/lib/usrp/usrp2/usrp2_iface.hpp
+++ b/host/lib/usrp/usrp2/usrp2_iface.hpp
@@ -32,7 +32,14 @@
 #define	I2C_ADDR_MBOARD (I2C_DEV_EEPROM | 0x0)
 #define	I2C_ADDR_TX_DB  (I2C_DEV_EEPROM | 0x4)
 #define	I2C_ADDR_RX_DB  (I2C_DEV_EEPROM | 0x5)
+
+////////////////////////////////////////////////////////////////////////
+// EEPROM Layout
 ////////////////////////////////////////////////////////////////////////
+#define EE_MBOARD_REV_LSB  0x00 //1 byte
+#define EE_MBOARD_REV_MSB  0x01 //1 byte
+#define EE_MBOARD_MAC_ADDR 0x02 //6 bytes
+#define EE_MBOARD_IP_ADDR  0x0C //uint32, big-endian
 
 /*!
  * The usrp2 interface class:
diff --git a/host/lib/usrp/usrp2/usrp2_impl.cpp b/host/lib/usrp/usrp2/usrp2_impl.cpp
index 1dde8c054..af3ec216a 100644
--- a/host/lib/usrp/usrp2/usrp2_impl.cpp
+++ b/host/lib/usrp/usrp2/usrp2_impl.cpp
@@ -72,7 +72,7 @@ uhd::device_addrs_t usrp2::find(const device_addr_t &hint){
     //send a hello control packet
     usrp2_ctrl_data_t ctrl_data_out;
     ctrl_data_out.proto_ver = htonl(USRP2_PROTO_VERSION);
-    ctrl_data_out.id = htonl(USRP2_CTRL_ID_GIVE_ME_YOUR_IP_ADDR_BRO);
+    ctrl_data_out.id = htonl(USRP2_CTRL_ID_WAZZUP_BRO);
     udp_transport->send(boost::asio::buffer(&ctrl_data_out, sizeof(ctrl_data_out)));
 
     //loop and recieve until the timeout
@@ -83,7 +83,7 @@ uhd::device_addrs_t usrp2::find(const device_addr_t &hint){
         if (len >= sizeof(usrp2_ctrl_data_t)){
             //handle the received data
             switch(ntohl(ctrl_data_in.id)){
-            case USRP2_CTRL_ID_THIS_IS_MY_IP_ADDR_DUDE:
+            case USRP2_CTRL_ID_WAZZUP_DUDE:
                 //make a boost asio ipv4 with the raw addr in host byte order
                 boost::asio::ip::address_v4 ip_addr(ntohl(ctrl_data_in.data.ip_addr));
                 device_addr_t new_addr;
@@ -147,6 +147,9 @@ usrp2_impl::usrp2_impl(
 
     //make a new interface for usrp2 stuff
     _iface = usrp2_iface::make(ctrl_transport);
+    _clock_ctrl = clock_ctrl::make(_iface);
+    _codec_ctrl = codec_ctrl::make(_iface);
+    _serdes_ctrl = serdes_ctrl::make(_iface);
 
     //load the allowed decim/interp rates
     //_USRP2_RATES = range(4, 128+1, 1) + range(130, 256+1, 2) + range(260, 512+1, 4)
@@ -207,14 +210,6 @@ void usrp2_impl::get(const wax::obj &key_, wax::obj &val){
         val = prop_names_t(1, "");
         return;
 
-    case DEVICE_PROP_MAX_RX_SAMPLES:
-        val = size_t(_max_rx_samples_per_packet);
-        return;
-
-    case DEVICE_PROP_MAX_TX_SAMPLES:
-        val = size_t(_max_tx_samples_per_packet);
-        return;
-
     default: UHD_THROW_PROP_GET_ERROR();
     }
 }
diff --git a/host/lib/usrp/usrp2/usrp2_impl.hpp b/host/lib/usrp/usrp2/usrp2_impl.hpp
index 1c9387744..7948a2069 100644
--- a/host/lib/usrp/usrp2/usrp2_impl.hpp
+++ b/host/lib/usrp/usrp2/usrp2_impl.hpp
@@ -19,7 +19,9 @@
 #define INCLUDED_USRP2_IMPL_HPP
 
 #include "usrp2_iface.hpp"
-#include "clock_control.hpp"
+#include "clock_ctrl.hpp"
+#include "codec_ctrl.hpp"
+#include "serdes_ctrl.hpp"
 #include <uhd/usrp/usrp2.hpp>
 #include <uhd/types/dict.hpp>
 #include <uhd/types/otw_type.hpp>
@@ -31,6 +33,7 @@
 #include <uhd/transport/vrt.hpp>
 #include <uhd/transport/udp_zero_copy.hpp>
 #include <uhd/usrp/dboard_manager.hpp>
+#include "../../transport/vrt_packet_handler.hpp"
 
 /*!
  * Make a usrp2 dboard interface.
@@ -40,7 +43,7 @@
  */
 uhd::usrp::dboard_iface::sptr make_usrp2_dboard_iface(
     usrp2_iface::sptr iface,
-    clock_control::sptr clk_ctrl
+    clock_ctrl::sptr clk_ctrl
 );
 
 /*!
@@ -101,8 +104,24 @@ public:
     ~usrp2_impl(void);
 
     //the io interface
-    size_t send(const boost::asio::const_buffer &, const uhd::tx_metadata_t &, const uhd::io_type_t &);
-    size_t recv(const boost::asio::mutable_buffer &, uhd::rx_metadata_t &, const uhd::io_type_t &);
+    size_t get_max_send_samps_per_packet(void) const{
+        return _max_tx_bytes_per_packet/_tx_otw_type.get_sample_size();
+    }
+    size_t send(
+        const boost::asio::const_buffer &,
+        const uhd::tx_metadata_t &,
+        const uhd::io_type_t &,
+        uhd::device::send_mode_t
+    );
+    size_t get_max_recv_samps_per_packet(void) const{
+        return _max_rx_bytes_per_packet/_rx_otw_type.get_sample_size();
+    }
+    size_t recv(
+        const boost::asio::mutable_buffer &,
+        uhd::rx_metadata_t &,
+        const uhd::io_type_t &,
+        uhd::device::recv_mode_t
+    );
 
 private:
     double get_master_clock_freq(void){
@@ -114,28 +133,29 @@ private:
     void set(const wax::obj &, const wax::obj &);
 
     //interfaces
-    clock_control::sptr _clk_ctrl;
     usrp2_iface::sptr _iface;
+    clock_ctrl::sptr _clock_ctrl;
+    codec_ctrl::sptr _codec_ctrl;
+    serdes_ctrl::sptr _serdes_ctrl;
 
-    //the raw io interface (samples are in the usrp2 native format)
-    void recv_raw(uhd::rx_metadata_t &);
-    uhd::dict<boost::uint32_t, size_t> _tx_stream_id_to_packet_seq;
-    uhd::dict<boost::uint32_t, size_t> _rx_stream_id_to_packet_seq;
+    /*******************************************************************
+     * Deal with the rx and tx packet sizes
+     ******************************************************************/
     static const size_t _mtu = 1500; //FIXME we have no idea
     static const size_t _hdrs = (2 + 14 + 20 + 8); //size of headers (pad, eth, ip, udp)
-    static const size_t _max_rx_samples_per_packet =
-        (_mtu - _hdrs)/sizeof(boost::uint32_t) -
-        USRP2_HOST_RX_VRT_HEADER_WORDS32 -
-        USRP2_HOST_RX_VRT_TRAILER_WORDS32
+    static const size_t _max_rx_bytes_per_packet =
+        _mtu - _hdrs -
+        USRP2_HOST_RX_VRT_HEADER_WORDS32*sizeof(boost::uint32_t) -
+        USRP2_HOST_RX_VRT_TRAILER_WORDS32*sizeof(boost::uint32_t)
     ;
-    static const size_t _max_tx_samples_per_packet =
-        (_mtu - _hdrs)/sizeof(boost::uint32_t) -
-        uhd::transport::vrt::max_header_words32
+    static const size_t _max_tx_bytes_per_packet =
+        _mtu - _hdrs -
+        uhd::transport::vrt::max_header_words32*sizeof(boost::uint32_t)
     ;
-    uhd::transport::managed_recv_buffer::sptr _rx_smart_buff;
-    boost::asio::const_buffer _rx_copy_buff;
-    size_t _fragment_offset_in_samps;
-    uhd::otw_type_t _otw_type;
+
+    vrt_packet_handler::recv_state _packet_handler_recv_state;
+    vrt_packet_handler::send_state _packet_handler_send_state;
+    uhd::otw_type_t _rx_otw_type, _tx_otw_type;
     void io_init(void);
 
     //udp transports for control and data
@@ -149,6 +169,7 @@ private:
 
     //rx and tx dboard methods and objects
     uhd::usrp::dboard_manager::sptr _dboard_manager;
+    uhd::usrp::dboard_iface::sptr _dboard_iface;
     void dboard_init(void);
 
     //properties for the mboard
diff --git a/host/lib/usrp/usrp2/usrp2_regs.hpp b/host/lib/usrp/usrp2/usrp2_regs.hpp
index 0e2a18756..0f675357b 100644
--- a/host/lib/usrp/usrp2/usrp2_regs.hpp
+++ b/host/lib/usrp/usrp2/usrp2_regs.hpp
@@ -64,7 +64,23 @@
 /////////////////////////////////////////////////
 // Misc Control
 ////////////////////////////////////////////////
-#define FR_CLOCK_CONTROL _SR_ADDR(0)
+#define FR_MISC_CTRL_CLOCK           _SR_ADDR(0)
+#define FR_MISC_CTRL_SERDES          _SR_ADDR(1)
+#define FR_MISC_CTRL_ADC             _SR_ADDR(2)
+#define FR_MISC_CTRL_LEDS            _SR_ADDR(3)
+#define FR_MISC_CTRL_PHY             _SR_ADDR(4) // LSB is reset line to eth phy
+#define FR_MISC_CTRL_DBG_MUX         _SR_ADDR(5)
+#define FR_MISC_CTRL_RAM_PAGE        _SR_ADDR(6) // FIXME should go somewhere else...
+#define FR_MISC_CTRL_FLUSH_ICACHE    _SR_ADDR(7) // Flush the icache
+#define FR_MISC_CTRL_LED_SRC         _SR_ADDR(8) // HW or SW control for LEDs
+
+#define FRF_MISC_CTRL_SERDES_ENABLE 8
+#define FRF_MISC_CTRL_SERDES_PRBSEN 4
+#define FRF_MISC_CTRL_SERDES_LOOPEN 2
+#define FRF_MISC_CTRL_SERDES_RXEN   1
+
+#define FRF_MISC_CTRL_ADC_ON  0x0F
+#define FRF_MISC_CTRL_ADC_OFF 0x00
 
 /////////////////////////////////////////////////
 // VITA49 64 bit time (write only)
@@ -188,7 +204,7 @@
 #define FR_GPIO_RX_SEL     FR_GPIO_BASE + 12 // 16 2-bit fields select which source goes to RX DB
 
 // each 2-bit sel field is layed out this way
-#define FRF_GPIO_SEL_SW        0 // if pin is an output, set by software in the io reg
+#define FRF_GPIO_SEL_GPIO      0 // if pin is an output, set by GPIO register
 #define FRF_GPIO_SEL_ATR       1 // if pin is an output, set by ATR logic
 #define FRF_GPIO_SEL_DEBUG_0   2 // if pin is an output, debug lines from FPGA fabric
 #define FRF_GPIO_SEL_DEBUG_1   3 // if pin is an output, debug lines from FPGA fabric
@@ -207,4 +223,25 @@
 #define FR_ATR_FULL_TXSIDE  FR_ATR_BASE + 12
 #define FR_ATR_FULL_RXSIDE  FR_ATR_BASE + 14
 
+///////////////////////////////////////////////////
+// VITA RX CTRL regs
+///////////////////////////////////////////////////
+// The following 3 are logically a single command register.
+// They are clocked into the underlying fifo when time_ticks is written.
+#define FR_RX_CTRL_STREAM_CMD        _SR_ADDR(SR_RX_CTRL + 0) // {now, chain, num_samples(30)
+#define FR_RX_CTRL_TIME_SECS         _SR_ADDR(SR_RX_CTRL + 1)
+#define FR_RX_CTRL_TIME_TICKS        _SR_ADDR(SR_RX_CTRL + 2)
+
+#define FR_RX_CTRL_CLEAR_OVERRUN     _SR_ADDR(SR_RX_CTRL + 3) // write anything to clear overrun
+#define FR_RX_CTRL_VRT_HEADER        _SR_ADDR(SR_RX_CTRL + 4) // word 0 of packet.  FPGA fills in packet counter
+#define FR_RX_CTRL_VRT_STREAM_ID     _SR_ADDR(SR_RX_CTRL + 5) // word 1 of packet.
+#define FR_RX_CTRL_VRT_TRAILER       _SR_ADDR(SR_RX_CTRL + 6)
+#define FR_RX_CTRL_NSAMPS_PER_PKT    _SR_ADDR(SR_RX_CTRL + 7)
+#define FR_RX_CTRL_NCHANNELS         _SR_ADDR(SR_RX_CTRL + 8) // 1 in basic case, up to 4 for vector sources
+
+//helpful macros for dealing with stream cmd
+#define FR_RX_CTRL_MAX_SAMPS_PER_CMD 0x1fffffff
+#define FR_RX_CTRL_MAKE_CMD(nsamples, now, chain, reload) \
+  ((((now) & 0x1) << 31) | (((chain) & 0x1) << 30) | (((reload) & 0x1) << 29) | ((nsamples) & 0x1fffffff))
+
 #endif /* INCLUDED_USRP2_REGS_HPP */
diff --git a/host/lib/usrp/usrp_e/dboard_iface.cpp b/host/lib/usrp/usrp_e/dboard_iface.cpp
index e70934b8c..23255b58c 100644
--- a/host/lib/usrp/usrp_e/dboard_iface.cpp
+++ b/host/lib/usrp/usrp_e/dboard_iface.cpp
@@ -49,8 +49,10 @@ public:
     void write_aux_dac(unit_t, int, float);
     float read_aux_adc(unit_t, int);
 
+    void set_pin_ctrl(unit_t, boost::uint16_t);
     void set_atr_reg(unit_t, atr_reg_t, boost::uint16_t);
     void set_gpio_ddr(unit_t, boost::uint16_t);
+    void write_gpio(unit_t, boost::uint16_t);
     boost::uint16_t read_gpio(unit_t);
 
     void write_i2c(boost::uint8_t, const byte_vector_t &);
@@ -111,29 +113,41 @@ void usrp_e_dboard_iface::set_clock_enabled(unit_t unit, bool enb){
 /***********************************************************************
  * GPIO
  **********************************************************************/
-void usrp_e_dboard_iface::set_gpio_ddr(unit_t bank, boost::uint16_t value){
-    //define mapping of gpio bank to register address
-    static const uhd::dict<unit_t, boost::uint32_t> bank_to_addr = map_list_of
-        (UNIT_RX, UE_REG_GPIO_RX_DDR)
-        (UNIT_TX, UE_REG_GPIO_TX_DDR)
-    ;
-    _iface->poke16(bank_to_addr[bank], value);
+void usrp_e_dboard_iface::set_pin_ctrl(unit_t unit, boost::uint16_t value){
+    UHD_ASSERT_THROW(GPIO_SEL_ATR == 1); //make this assumption
+    switch(unit){
+    case UNIT_RX: _iface->poke16(UE_REG_GPIO_RX_SEL, value); return;
+    case UNIT_TX: _iface->poke16(UE_REG_GPIO_TX_SEL, value); return;
+    }
 }
 
-boost::uint16_t usrp_e_dboard_iface::read_gpio(unit_t bank){
-    //define mapping of gpio bank to register address
-    static const uhd::dict<unit_t, boost::uint32_t> bank_to_addr = map_list_of
-        (UNIT_RX, UE_REG_GPIO_RX_IO)
-        (UNIT_TX, UE_REG_GPIO_TX_IO)
-    ;
-    return _iface->peek16(bank_to_addr[bank]);
+void usrp_e_dboard_iface::set_gpio_ddr(unit_t unit, boost::uint16_t value){
+    switch(unit){
+    case UNIT_RX: _iface->poke16(UE_REG_GPIO_RX_DDR, value); return;
+    case UNIT_TX: _iface->poke16(UE_REG_GPIO_TX_DDR, value); return;
+    }
+}
+
+void usrp_e_dboard_iface::write_gpio(unit_t unit, boost::uint16_t value){
+    switch(unit){
+    case UNIT_RX: _iface->poke16(UE_REG_GPIO_RX_IO, value); return;
+    case UNIT_TX: _iface->poke16(UE_REG_GPIO_TX_IO, value); return;
+    }
+}
+
+boost::uint16_t usrp_e_dboard_iface::read_gpio(unit_t unit){
+    switch(unit){
+    case UNIT_RX: return _iface->peek16(UE_REG_GPIO_RX_IO);
+    case UNIT_TX: return _iface->peek16(UE_REG_GPIO_TX_IO);
+    }
+    UHD_ASSERT_THROW(false);
 }
 
-void usrp_e_dboard_iface::set_atr_reg(unit_t bank, atr_reg_t atr, boost::uint16_t value){
-    //define mapping of bank to atr regs to register address
+void usrp_e_dboard_iface::set_atr_reg(unit_t unit, atr_reg_t atr, boost::uint16_t value){
+    //define mapping of unit to atr regs to register address
     static const uhd::dict<
         unit_t, uhd::dict<atr_reg_t, boost::uint32_t>
-    > bank_to_atr_to_addr = map_list_of
+    > unit_to_atr_to_addr = map_list_of
         (UNIT_RX, map_list_of
             (ATR_REG_IDLE,        UE_REG_ATR_IDLE_RXSIDE)
             (ATR_REG_TX_ONLY,     UE_REG_ATR_INTX_RXSIDE)
@@ -147,7 +161,7 @@ void usrp_e_dboard_iface::set_atr_reg(unit_t bank, atr_reg_t atr, boost::uint16_
             (ATR_REG_FULL_DUPLEX, UE_REG_ATR_FULL_TXSIDE)
         )
     ;
-    _iface->poke16(bank_to_atr_to_addr[bank][atr], value);
+    _iface->poke16(unit_to_atr_to_addr[unit][atr], value);
 }
 
 /***********************************************************************
diff --git a/host/lib/usrp/usrp_e/usrp_e_impl.cpp b/host/lib/usrp/usrp_e/usrp_e_impl.cpp
index 4f7361eca..4a398e21c 100644
--- a/host/lib/usrp/usrp_e/usrp_e_impl.cpp
+++ b/host/lib/usrp/usrp_e/usrp_e_impl.cpp
@@ -117,14 +117,6 @@ void usrp_e_impl::get(const wax::obj &key_, wax::obj &val){
         val = prop_names_t(1, ""); //vector of size 1 with empty string
         return;
 
-    case DEVICE_PROP_MAX_RX_SAMPLES:
-        val = size_t(_max_num_samples);
-        return;
-
-    case DEVICE_PROP_MAX_TX_SAMPLES:
-        val = size_t(_max_num_samples);
-        return;
-
     default: UHD_THROW_PROP_GET_ERROR();
     }
 }
@@ -142,7 +134,8 @@ void usrp_e_impl::set(const wax::obj &, const wax::obj &){
 size_t usrp_e_impl::send(
     const boost::asio::const_buffer &,
     const uhd::tx_metadata_t &,
-    const io_type_t &
+    const io_type_t &,
+    send_mode_t
 ){
     if (true){
         throw std::runtime_error(str(boost::format("usrp-e send: cannot handle type \"%s\"") % ""));
@@ -153,7 +146,8 @@ size_t usrp_e_impl::send(
 size_t usrp_e_impl::recv(
     const boost::asio::mutable_buffer &,
     uhd::rx_metadata_t &,
-    const io_type_t &
+    const io_type_t &,
+    recv_mode_t
 ){
     if (true){
         throw std::runtime_error(str(boost::format("usrp-e recv: cannot handle type \"%s\"") % ""));
diff --git a/host/lib/usrp/usrp_e/usrp_e_impl.hpp b/host/lib/usrp/usrp_e/usrp_e_impl.hpp
index 59f80c70c..a2cdbc31e 100644
--- a/host/lib/usrp/usrp_e/usrp_e_impl.hpp
+++ b/host/lib/usrp/usrp_e/usrp_e_impl.hpp
@@ -89,8 +89,10 @@ public:
     ~usrp_e_impl(void);
 
     //the io interface
-    size_t send(const boost::asio::const_buffer &, const uhd::tx_metadata_t &, const uhd::io_type_t &);
-    size_t recv(const boost::asio::mutable_buffer &, uhd::rx_metadata_t &, const uhd::io_type_t &);
+    size_t send(const boost::asio::const_buffer &, const uhd::tx_metadata_t &, const uhd::io_type_t &, send_mode_t);
+    size_t recv(const boost::asio::mutable_buffer &, uhd::rx_metadata_t &, const uhd::io_type_t &, recv_mode_t);
+    size_t get_max_send_samps_per_packet(void) const{return _max_num_samples;}
+    size_t get_max_recv_samps_per_packet(void) const{return _max_num_samples;}
 
 private:
     static const size_t _max_num_samples = 2048/sizeof(boost::uint32_t);
diff --git a/host/lib/usrp/usrp_e/usrp_e_regs.hpp b/host/lib/usrp/usrp_e/usrp_e_regs.hpp
index 7f35212f4..51a47f061 100644
--- a/host/lib/usrp/usrp_e/usrp_e_regs.hpp
+++ b/host/lib/usrp/usrp_e/usrp_e_regs.hpp
@@ -78,11 +78,13 @@
 #define UE_REG_GPIO_RX_DBG     UE_REG_GPIO_BASE + 12
 #define UE_REG_GPIO_TX_DBG     UE_REG_GPIO_BASE + 14
 
-// each 2-bit sel field is layed out this way
-#define GPIO_SEL_SW	   0 // if pin is an output, set by software in the io reg
-#define	GPIO_SEL_ATR	   1 // if pin is an output, set by ATR logic
-#define	GPIO_SEL_DEBUG_0   0 // if pin is an output, debug lines from FPGA fabric
-#define	GPIO_SEL_DEBUG_1   1 // if pin is an output, debug lines from FPGA fabric
+//possible bit values for sel when dbg is 0:
+#define GPIO_SEL_SW    0 // if pin is an output, set by software in the io reg
+#define GPIO_SEL_ATR   1 // if pin is an output, set by ATR logic
+
+//possible bit values for sel when dbg is 1:
+#define GPIO_SEL_DEBUG_0   0 // if pin is an output, debug lines from FPGA fabric
+#define GPIO_SEL_DEBUG_1   1 // if pin is an output, debug lines from FPGA fabric
 
 
 ////////////////////////////////////////////////////