Merge branch 'xusrp'

14 files changed, 807 insertions, 475 deletions

diff --git a/host/lib/transport/gen_convert_types.py b/host/lib/transport/gen_convert_types.py
index adbd22868..f9509c81d 100755
--- a/host/lib/transport/gen_convert_types.py
+++ b/host/lib/transport/gen_convert_types.py
@@ -99,9 +99,9 @@ void transport::convert_io_type_to_otw_type(
             nsamps_per_io_buff
         );
         #else
-        for (size_t i = 0; i < nsamps_per_io_buff; i++){
+        for (size_t i = 0, j = 0; i < nsamps_per_io_buff; i++){
             #for $j in range($num_chans)
-            reinterpret_cast<$(out_type)_t *>(otw_buff)[i*$num_chans + $j] =
+            reinterpret_cast<$(out_type)_t *>(otw_buff)[j++] =
                 #if $ph.get_swap_type($pred) == 'bswap'
                 uhd::byteswap($(converter)(reinterpret_cast<const $(in_type)_t *>(io_buffs[$j])[i]));
                 #else
@@ -139,13 +139,13 @@ void transport::convert_otw_type_to_io_type(
             nsamps_per_io_buff
         );
         #else
-        for (size_t i = 0; i < nsamps_per_io_buff; i++){
+        for (size_t i = 0, j = 0; i < nsamps_per_io_buff; i++){
             #for $j in range($num_chans)
             reinterpret_cast<$(out_type)_t *>(io_buffs[$j])[i] =
                 #if $ph.get_swap_type($pred) == 'bswap'
-                $(converter)(uhd::byteswap(reinterpret_cast<const $(in_type)_t *>(otw_buff)[i*$num_chans + $j]));
+                $(converter)(uhd::byteswap(reinterpret_cast<const $(in_type)_t *>(otw_buff)[j++]));
                 #else
-                $(converter)(reinterpret_cast<const $(in_type)_t *>(otw_buff)[i*$num_chans + $j]);
+                $(converter)(reinterpret_cast<const $(in_type)_t *>(otw_buff)[j++]);
                 #end if
             #end for
         }
diff --git a/host/lib/transport/vrt_packet_handler.hpp b/host/lib/transport/vrt_packet_handler.hpp
index 7e0588f03..b603f1371 100644
--- a/host/lib/transport/vrt_packet_handler.hpp
+++ b/host/lib/transport/vrt_packet_handler.hpp
@@ -150,7 +150,8 @@ template <typename T> UHD_INLINE T get_context_code(
         const vrt_unpacker_t &vrt_unpacker,
         const get_recv_buffs_t &get_recv_buffs,
         const handle_overflow_t &handle_overflow,
-        size_t vrt_header_offset_words32
+        size_t vrt_header_offset_words32,
+        size_t chans_per_otw_buff
     ){
         metadata.error_code = uhd::rx_metadata_t::ERROR_CODE_NONE;
 
@@ -184,15 +185,21 @@ template <typename T> UHD_INLINE T get_context_code(
         //extract the number of samples available to copy
         size_t bytes_per_item = otw_type.get_sample_size();
         size_t nsamps_available = state.size_of_copy_buffs/bytes_per_item;
-        size_t nsamps_to_copy = std::min(total_samps, nsamps_available);
+        size_t nsamps_to_copy = std::min(total_samps*chans_per_otw_buff, nsamps_available);
         size_t bytes_to_copy = nsamps_to_copy*bytes_per_item;
+        size_t nsamps_to_copy_per_io_buff = nsamps_to_copy/chans_per_otw_buff;
+
+        std::vector<void *> io_buffs(chans_per_otw_buff);
+        for (size_t i = 0; i < state.width; i+=chans_per_otw_buff){
+
+            //fill a vector with pointers to the io buffers
+            for (size_t j = 0; j < chans_per_otw_buff; j++){
+                io_buffs[j] = reinterpret_cast<boost::uint8_t *>(buffs[i+j]) + offset_bytes;
+            }
 
-        for (size_t i = 0; i < state.width; i++){
             //copy-convert the samples from the recv buffer
             uhd::transport::convert_otw_type_to_io_type(
-                state.copy_buffs[i], otw_type,
-                reinterpret_cast<boost::uint8_t *>(buffs[i]) + offset_bytes,
-                io_type, nsamps_to_copy
+                state.copy_buffs[i], otw_type, io_buffs, io_type, nsamps_to_copy_per_io_buff
             );
 
             //update the rx copy buffer to reflect the bytes copied
@@ -206,7 +213,7 @@ template <typename T> UHD_INLINE T get_context_code(
         metadata.fragment_offset = state.fragment_offset_in_samps;
         state.fragment_offset_in_samps += nsamps_to_copy; //set for next call
 
-        return nsamps_to_copy;
+        return nsamps_to_copy_per_io_buff;
     }
 
     /*******************************************************************
@@ -224,7 +231,8 @@ template <typename T> UHD_INLINE T get_context_code(
         const vrt_unpacker_t &vrt_unpacker,
         const get_recv_buffs_t &get_recv_buffs,
         const handle_overflow_t &handle_overflow = &handle_overflow_nop,
-        size_t vrt_header_offset_words32 = 0
+        size_t vrt_header_offset_words32 = 0,
+        size_t chans_per_otw_buff = 1
     ){
         switch(recv_mode){
 
@@ -241,7 +249,8 @@ template <typename T> UHD_INLINE T get_context_code(
                 vrt_unpacker,
                 get_recv_buffs,
                 handle_overflow,
-                vrt_header_offset_words32
+                vrt_header_offset_words32,
+                chans_per_otw_buff
             );
         }
 
@@ -261,7 +270,8 @@ template <typename T> UHD_INLINE T get_context_code(
                     vrt_unpacker,
                     get_recv_buffs,
                     handle_overflow,
-                    vrt_header_offset_words32
+                    vrt_header_offset_words32,
+                    chans_per_otw_buff
                 );
                 if (num_samps == 0) break; //had a recv timeout or error, break loop
                 accum_num_samps += num_samps;
@@ -303,29 +313,32 @@ template <typename T> UHD_INLINE T get_context_code(
         const uhd::otw_type_t &otw_type,
         const vrt_packer_t &vrt_packer,
         const get_send_buffs_t &get_send_buffs,
-        size_t vrt_header_offset_words32
+        size_t vrt_header_offset_words32,
+        size_t chans_per_otw_buff
     ){
         //load the rest of the if_packet_info in here
-        if_packet_info.num_payload_words32 = (num_samps*otw_type.get_sample_size())/sizeof(boost::uint32_t);
+        if_packet_info.num_payload_words32 = (num_samps*chans_per_otw_buff*otw_type.get_sample_size())/sizeof(boost::uint32_t);
         if_packet_info.packet_count = state.next_packet_seq++;
 
         //get send buffers for each channel
-        managed_send_buffs_t send_buffs(buffs.size());
+        managed_send_buffs_t send_buffs(buffs.size()/chans_per_otw_buff);
         UHD_ASSERT_THROW(get_send_buffs(send_buffs));
 
-        for (size_t i = 0; i < buffs.size(); i++){
+        std::vector<const void *> io_buffs(chans_per_otw_buff);
+        for (size_t i = 0; i < buffs.size(); i+=chans_per_otw_buff){
             //calculate pointers with offsets to io and otw memory
-            const boost::uint8_t *io_mem = reinterpret_cast<const boost::uint8_t *>(buffs[i]) + offset_bytes;
+            for (size_t j = 0; j < chans_per_otw_buff; j++){
+                io_buffs[j] = reinterpret_cast<const boost::uint8_t *>(buffs[i+j]) + offset_bytes;
+            }
             boost::uint32_t *otw_mem = send_buffs[i]->cast<boost::uint32_t *>() + vrt_header_offset_words32;
 
             //pack metadata into a vrt header
             vrt_packer(otw_mem, if_packet_info);
+            otw_mem += if_packet_info.num_header_words32;
 
             //copy-convert the samples into the send buffer
             uhd::transport::convert_io_type_to_otw_type(
-                io_mem, io_type,
-                otw_mem + if_packet_info.num_header_words32, otw_type,
-                num_samps
+                io_buffs, io_type, otw_mem, otw_type, num_samps
             );
 
             //commit the samples to the zero-copy interface
@@ -351,7 +364,8 @@ template <typename T> UHD_INLINE T get_context_code(
         const vrt_packer_t &vrt_packer,
         const get_send_buffs_t &get_send_buffs,
         size_t max_samples_per_packet,
-        size_t vrt_header_offset_words32 = 0
+        size_t vrt_header_offset_words32 = 0,
+        size_t chans_per_otw_buff = 1
     ){
         //translate the metadata to vrt if packet info
         uhd::transport::vrt::if_packet_info_t if_packet_info;
@@ -383,7 +397,8 @@ template <typename T> UHD_INLINE T get_context_code(
                 io_type, otw_type,
                 vrt_packer,
                 get_send_buffs,
-                vrt_header_offset_words32
+                vrt_header_offset_words32,
+                chans_per_otw_buff
             );
             return num_samps;
         }
@@ -414,7 +429,8 @@ template <typename T> UHD_INLINE T get_context_code(
                     io_type, otw_type,
                     vrt_packer,
                     get_send_buffs,
-                    vrt_header_offset_words32
+                    vrt_header_offset_words32,
+                    chans_per_otw_buff
                 );
             }
             return total_num_samps;
diff --git a/host/lib/usrp/CMakeLists.txt b/host/lib/usrp/CMakeLists.txt
index b5c545988..69a190bfa 100644
--- a/host/lib/usrp/CMakeLists.txt
+++ b/host/lib/usrp/CMakeLists.txt
@@ -26,6 +26,7 @@ LIBUHD_APPEND_SOURCES(
     ${CMAKE_SOURCE_DIR}/lib/usrp/mimo_usrp.cpp
     ${CMAKE_SOURCE_DIR}/lib/usrp/misc_utils.cpp
     ${CMAKE_SOURCE_DIR}/lib/usrp/simple_usrp.cpp
+    ${CMAKE_SOURCE_DIR}/lib/usrp/single_usrp.cpp
     ${CMAKE_SOURCE_DIR}/lib/usrp/subdev_spec.cpp
     ${CMAKE_SOURCE_DIR}/lib/usrp/tune_helper.cpp
 )
diff --git a/host/lib/usrp/dboard/db_basic_and_lf.cpp b/host/lib/usrp/dboard/db_basic_and_lf.cpp
index 2a9bf2ca5..4b0d8bf27 100644
--- a/host/lib/usrp/dboard/db_basic_and_lf.cpp
+++ b/host/lib/usrp/dboard/db_basic_and_lf.cpp
@@ -59,6 +59,7 @@ private:
 
 static const uhd::dict<std::string, subdev_conn_t> sd_name_to_conn = map_list_of
     ("AB", SUBDEV_CONN_COMPLEX_IQ)
+    ("BA", SUBDEV_CONN_COMPLEX_QI)
     ("A",  SUBDEV_CONN_REAL_I)
     ("B",  SUBDEV_CONN_REAL_Q)
 ;
diff --git a/host/lib/usrp/mimo_usrp.cpp b/host/lib/usrp/mimo_usrp.cpp
index e78d38fc0..9331c7fbb 100644
--- a/host/lib/usrp/mimo_usrp.cpp
+++ b/host/lib/usrp/mimo_usrp.cpp
@@ -179,15 +179,15 @@ public:
     }
 
     tune_result_t set_rx_freq(size_t chan, double target_freq){
-        return tune_rx_subdev_and_dsp(_rx_subdev(chan), _rx_dsp(chan), target_freq);
+        return tune_rx_subdev_and_dsp(_rx_subdev(chan), _rx_dsp(chan), 0, target_freq);
     }
 
     tune_result_t set_rx_freq(size_t chan, double target_freq, double lo_off){
-        return tune_rx_subdev_and_dsp(_rx_subdev(chan), _rx_dsp(chan), target_freq, lo_off);
+        return tune_rx_subdev_and_dsp(_rx_subdev(chan), _rx_dsp(chan), 0, target_freq, lo_off);
     }
 
     double get_rx_freq(size_t chan){
-        return derive_freq_from_rx_subdev_and_dsp(_rx_subdev(chan), _rx_dsp(chan));
+        return derive_freq_from_rx_subdev_and_dsp(_rx_subdev(chan), _rx_dsp(chan), 0);
     }
 
     freq_range_t get_rx_freq_range(size_t chan){
@@ -255,15 +255,15 @@ public:
     }
 
     tune_result_t set_tx_freq(size_t chan, double target_freq){
-        return tune_tx_subdev_and_dsp(_tx_subdev(chan), _tx_dsp(chan), target_freq);
+        return tune_tx_subdev_and_dsp(_tx_subdev(chan), _tx_dsp(chan), 0, target_freq);
     }
 
     tune_result_t set_tx_freq(size_t chan, double target_freq, double lo_off){
-        return tune_tx_subdev_and_dsp(_tx_subdev(chan), _tx_dsp(chan), target_freq, lo_off);
+        return tune_tx_subdev_and_dsp(_tx_subdev(chan), _tx_dsp(chan), 0, target_freq, lo_off);
     }
 
     double get_tx_freq(size_t chan){
-        return derive_freq_from_tx_subdev_and_dsp(_tx_subdev(chan), _tx_dsp(chan));
+        return derive_freq_from_tx_subdev_and_dsp(_tx_subdev(chan), _tx_dsp(chan), 0);
     }
 
     freq_range_t get_tx_freq_range(size_t chan){
diff --git a/host/lib/usrp/simple_usrp.cpp b/host/lib/usrp/simple_usrp.cpp
index e573d0fc0..b89b76eed 100644
--- a/host/lib/usrp/simple_usrp.cpp
+++ b/host/lib/usrp/simple_usrp.cpp
@@ -15,35 +15,20 @@
 // along with this program.  If not, see <http://www.gnu.org/licenses/>.
 //
 
+#include <uhd/usrp/single_usrp.hpp>
 #include <uhd/usrp/simple_usrp.hpp>
-#include <uhd/usrp/tune_helper.hpp>
-#include <uhd/utils/assert.hpp>
-#include <uhd/utils/gain_group.hpp>
-#include <uhd/usrp/subdev_props.hpp>
-#include <uhd/usrp/mboard_props.hpp>
-#include <uhd/usrp/device_props.hpp>
-#include <uhd/usrp/dboard_props.hpp>
-#include <uhd/usrp/dsp_props.hpp>
-#include <boost/foreach.hpp>
-#include <boost/format.hpp>
-#include <stdexcept>
-#include <iostream>
+#include <uhd/utils/warning.hpp>
 
 using namespace uhd;
 using namespace uhd::usrp;
 
-static inline freq_range_t add_dsp_shift(const freq_range_t &range, wax::obj dsp){
-    double codec_rate = dsp[DSP_PROP_CODEC_RATE].as<double>();
-    return freq_range_t(range.min - codec_rate/2.0, range.max + codec_rate/2.0);
-}
-
 /***********************************************************************
  * Simple USRP Implementation
  **********************************************************************/
 class simple_usrp_impl : public simple_usrp{
 public:
     simple_usrp_impl(const device_addr_t &addr){
-        _dev = device::make(addr);
+        _sdev = single_usrp::make(addr);
     }
 
     ~simple_usrp_impl(void){
@@ -51,235 +36,187 @@ public:
     }
 
     device::sptr get_device(void){
-        return _dev;
+        return _sdev->get_device();
     }
 
     std::string get_pp_string(void){
-        return str(boost::format(
-            "Simple USRP:\n"
-            "  Device: %s\n"
-            "  Mboard: %s\n"
-            "  RX DSP: %s\n"
-            "  RX Dboard: %s\n"
-            "  RX Subdev: %s\n"
-            "  TX DSP: %s\n"
-            "  TX Dboard: %s\n"
-            "  TX Subdev: %s\n"
-        )
-            % (*_dev)[DEVICE_PROP_NAME].as<std::string>()
-            % _mboard()[MBOARD_PROP_NAME].as<std::string>()
-            % _rx_dsp()[DSP_PROP_NAME].as<std::string>()
-            % _rx_dboard()[DBOARD_PROP_NAME].as<std::string>()
-            % _rx_subdev()[SUBDEV_PROP_NAME].as<std::string>()
-            % _tx_dsp()[DSP_PROP_NAME].as<std::string>()
-            % _tx_dboard()[DBOARD_PROP_NAME].as<std::string>()
-            % _tx_subdev()[SUBDEV_PROP_NAME].as<std::string>()
-        );
+        return _sdev->get_pp_string();
     }
 
     /*******************************************************************
      * Misc
      ******************************************************************/
     time_spec_t get_time_now(void){
-        return _mboard()[MBOARD_PROP_TIME_NOW].as<time_spec_t>();
+        return _sdev->get_time_now();
     }
 
     void set_time_now(const time_spec_t &time_spec){
-        _mboard()[MBOARD_PROP_TIME_NOW] = time_spec;
+        return _sdev->set_time_now(time_spec);
     }
 
     void set_time_next_pps(const time_spec_t &time_spec){
-        _mboard()[MBOARD_PROP_TIME_NEXT_PPS] = time_spec;
+        return _sdev->set_time_next_pps(time_spec);
     }
 
     void issue_stream_cmd(const stream_cmd_t &stream_cmd){
-        _mboard()[MBOARD_PROP_STREAM_CMD] = stream_cmd;
+        return _sdev->issue_stream_cmd(stream_cmd);
     }
 
     void set_clock_config(const clock_config_t &clock_config){
-        _mboard()[MBOARD_PROP_CLOCK_CONFIG] = clock_config;
+        return _sdev->set_clock_config(clock_config);
     }
 
     /*******************************************************************
      * RX methods
      ******************************************************************/
     void set_rx_subdev_spec(const subdev_spec_t &spec){
-        _mboard()[MBOARD_PROP_RX_SUBDEV_SPEC] = spec;
-        std::cout << "RX " << _mboard()[MBOARD_PROP_RX_SUBDEV_SPEC].as<subdev_spec_t>().to_pp_string() << std::endl;
+        return _sdev->set_rx_subdev_spec(spec);
     }
 
     subdev_spec_t get_rx_subdev_spec(void){
-        return _mboard()[MBOARD_PROP_RX_SUBDEV_SPEC].as<subdev_spec_t>();
+        return _sdev->get_rx_subdev_spec();
     }
 
     void set_rx_rate(double rate){
-        _rx_dsp()[DSP_PROP_HOST_RATE] = rate;
+        return _sdev->set_rx_rate(rate);
     }
 
     double get_rx_rate(void){
-        return _rx_dsp()[DSP_PROP_HOST_RATE].as<double>();
+        return _sdev->get_rx_rate();
     }
 
     tune_result_t set_rx_freq(double target_freq){
-        return tune_rx_subdev_and_dsp(_rx_subdev(), _rx_dsp(), target_freq);
+        return _sdev->set_rx_freq(target_freq);
     }
 
     tune_result_t set_rx_freq(double target_freq, double lo_off){
-        return tune_rx_subdev_and_dsp(_rx_subdev(), _rx_dsp(), target_freq, lo_off);
+        return _sdev->set_rx_freq(target_freq, lo_off);
     }
 
     double get_rx_freq(void){
-        return derive_freq_from_rx_subdev_and_dsp(_rx_subdev(), _rx_dsp());
+        return _sdev->get_rx_freq();
     }
 
     freq_range_t get_rx_freq_range(void){
-        return add_dsp_shift(_rx_subdev()[SUBDEV_PROP_FREQ_RANGE].as<freq_range_t>(), _rx_dsp());
+        return _sdev->get_rx_freq_range();
     }
 
     void set_rx_gain(float gain){
-        return _rx_gain_group()->set_value(gain);
+        return _sdev->set_rx_gain(gain);
     }
 
     float get_rx_gain(void){
-        return _rx_gain_group()->get_value();
+        return _sdev->get_rx_gain();
     }
 
     gain_range_t get_rx_gain_range(void){
-        return _rx_gain_group()->get_range();
+        return _sdev->get_rx_gain_range();
     }
 
     void set_rx_antenna(const std::string &ant){
-        _rx_subdev()[SUBDEV_PROP_ANTENNA] = ant;
+        return _sdev->set_rx_antenna(ant);
     }
 
     std::string get_rx_antenna(void){
-        return _rx_subdev()[SUBDEV_PROP_ANTENNA].as<std::string>();
+        return _sdev->get_rx_antenna();
     }
 
     std::vector<std::string> get_rx_antennas(void){
-        return _rx_subdev()[SUBDEV_PROP_ANTENNA_NAMES].as<prop_names_t>();
+        return _sdev->get_rx_antennas();
     }
 
     bool get_rx_lo_locked(void){
-        return _rx_subdev()[SUBDEV_PROP_LO_LOCKED].as<bool>();
+        return _sdev->get_rx_lo_locked();
     }
 
     float read_rssi(void){
-        return _rx_subdev()[SUBDEV_PROP_RSSI].as<float>();
+        return _sdev->read_rssi();
     }
 
     dboard_iface::sptr get_rx_dboard_iface(void){
-        return _rx_dboard()[DBOARD_PROP_DBOARD_IFACE].as<dboard_iface::sptr>();
+        return _sdev->get_rx_dboard_iface();
     }
 
     /*******************************************************************
      * TX methods
      ******************************************************************/
     void set_tx_subdev_spec(const subdev_spec_t &spec){
-        _mboard()[MBOARD_PROP_TX_SUBDEV_SPEC] = spec;
-        std::cout << "TX " << _mboard()[MBOARD_PROP_TX_SUBDEV_SPEC].as<subdev_spec_t>().to_pp_string() << std::endl;
+        return _sdev->set_tx_subdev_spec(spec);
     }
 
     subdev_spec_t get_tx_subdev_spec(void){
-        return _mboard()[MBOARD_PROP_TX_SUBDEV_SPEC].as<subdev_spec_t>();
+        return _sdev->get_tx_subdev_spec();
     }
 
     void set_tx_rate(double rate){
-        _tx_dsp()[DSP_PROP_HOST_RATE] = rate;
+        return _sdev->set_tx_rate(rate);
     }
 
     double get_tx_rate(void){
-        return _tx_dsp()[DSP_PROP_HOST_RATE].as<double>();
+        return _sdev->get_tx_rate();
     }
 
     tune_result_t set_tx_freq(double target_freq){
-        return tune_tx_subdev_and_dsp(_tx_subdev(), _tx_dsp(), target_freq);
+        return _sdev->set_tx_freq(target_freq);
     }
 
     tune_result_t set_tx_freq(double target_freq, double lo_off){
-        return tune_tx_subdev_and_dsp(_tx_subdev(), _tx_dsp(), target_freq, lo_off);
+        return _sdev->set_tx_freq(target_freq, lo_off);
     }
 
     double get_tx_freq(void){
-        return derive_freq_from_tx_subdev_and_dsp(_tx_subdev(), _tx_dsp());
+        return _sdev->get_tx_freq();
     }
 
     freq_range_t get_tx_freq_range(void){
-        return add_dsp_shift(_tx_subdev()[SUBDEV_PROP_FREQ_RANGE].as<freq_range_t>(), _tx_dsp());
+        return _sdev->get_tx_freq_range();
     }
 
     void set_tx_gain(float gain){
-        return _tx_gain_group()->set_value(gain);
+        return _sdev->set_tx_gain(gain);
     }
 
     float get_tx_gain(void){
-        return _tx_gain_group()->get_value();
+        return _sdev->get_tx_gain();
     }
 
     gain_range_t get_tx_gain_range(void){
-        return _tx_gain_group()->get_range();
+        return _sdev->get_tx_gain_range();
     }
 
     void set_tx_antenna(const std::string &ant){
-        _tx_subdev()[SUBDEV_PROP_ANTENNA] = ant;
+        return _sdev->set_tx_antenna(ant);
     }
 
     std::string get_tx_antenna(void){
-        return _tx_subdev()[SUBDEV_PROP_ANTENNA].as<std::string>();
+        return _sdev->get_tx_antenna();
     }
 
     std::vector<std::string> get_tx_antennas(void){
-        return _tx_subdev()[SUBDEV_PROP_ANTENNA_NAMES].as<prop_names_t>();
+        return _sdev->get_tx_antennas();
     }
 
     bool get_tx_lo_locked(void){
-        return _tx_subdev()[SUBDEV_PROP_LO_LOCKED].as<bool>();
+        return _sdev->get_tx_lo_locked();
     }
 
     dboard_iface::sptr get_tx_dboard_iface(void){
-        return _tx_dboard()[DBOARD_PROP_DBOARD_IFACE].as<dboard_iface::sptr>();
+        return _sdev->get_tx_dboard_iface();
     }
 
 private:
-    device::sptr _dev;
-    wax::obj _mboard(void){
-        return (*_dev)[DEVICE_PROP_MBOARD];
-    }
-    wax::obj _rx_dsp(void){
-        return _mboard()[MBOARD_PROP_RX_DSP];
-    }
-    wax::obj _tx_dsp(void){
-        return _mboard()[MBOARD_PROP_TX_DSP];
-    }
-    wax::obj _rx_dboard(void){
-        std::string db_name = _mboard()[MBOARD_PROP_RX_SUBDEV_SPEC].as<subdev_spec_t>().front().db_name;
-        return _mboard()[named_prop_t(MBOARD_PROP_RX_DBOARD, db_name)];
-    }
-    wax::obj _tx_dboard(void){
-        std::string db_name = _mboard()[MBOARD_PROP_TX_SUBDEV_SPEC].as<subdev_spec_t>().front().db_name;
-        return _mboard()[named_prop_t(MBOARD_PROP_TX_DBOARD, db_name)];
-    }
-    wax::obj _rx_subdev(void){
-        std::string sd_name = _mboard()[MBOARD_PROP_RX_SUBDEV_SPEC].as<subdev_spec_t>().front().sd_name;
-        return _rx_dboard()[named_prop_t(DBOARD_PROP_SUBDEV, sd_name)];
-    }
-    wax::obj _tx_subdev(void){
-        std::string sd_name = _mboard()[MBOARD_PROP_TX_SUBDEV_SPEC].as<subdev_spec_t>().front().sd_name;
-        return _tx_dboard()[named_prop_t(DBOARD_PROP_SUBDEV, sd_name)];
-    }
-    gain_group::sptr _rx_gain_group(void){
-        std::string sd_name = _mboard()[MBOARD_PROP_RX_SUBDEV_SPEC].as<subdev_spec_t>().front().sd_name;
-        return _rx_dboard()[named_prop_t(DBOARD_PROP_GAIN_GROUP, sd_name)].as<gain_group::sptr>();
-    }
-    gain_group::sptr _tx_gain_group(void){
-        std::string sd_name = _mboard()[MBOARD_PROP_TX_SUBDEV_SPEC].as<subdev_spec_t>().front().sd_name;
-        return _tx_dboard()[named_prop_t(DBOARD_PROP_GAIN_GROUP, sd_name)].as<gain_group::sptr>();
-    }
+    single_usrp::sptr _sdev;
 };
 
 /***********************************************************************
  * The Make Function
  **********************************************************************/
 simple_usrp::sptr simple_usrp::make(const device_addr_t &dev_addr){
+    uhd::print_warning(
+        "The simple USRP interface has been deprecated.\n"
+        "Please switch to the single USRP interface.\n"
+        "#include <uhd/usrp/single_usrp.hpp>\n"
+        "single_usrp::sptr sdev = single_usrp::make(args);\n"
+    );
     return sptr(new simple_usrp_impl(dev_addr));
 }
diff --git a/host/lib/usrp/single_usrp.cpp b/host/lib/usrp/single_usrp.cpp
new file mode 100644
index 000000000..bb4af44b8
--- /dev/null
+++ b/host/lib/usrp/single_usrp.cpp
@@ -0,0 +1,307 @@
+//
+// Copyright 2010 Ettus Research LLC
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+//
+
+#include <uhd/usrp/single_usrp.hpp>
+#include <uhd/usrp/tune_helper.hpp>
+#include <uhd/utils/assert.hpp>
+#include <uhd/utils/gain_group.hpp>
+#include <uhd/usrp/subdev_props.hpp>
+#include <uhd/usrp/mboard_props.hpp>
+#include <uhd/usrp/device_props.hpp>
+#include <uhd/usrp/dboard_props.hpp>
+#include <uhd/usrp/dsp_props.hpp>
+#include <boost/foreach.hpp>
+#include <boost/format.hpp>
+#include <stdexcept>
+#include <iostream>
+
+using namespace uhd;
+using namespace uhd::usrp;
+
+static inline freq_range_t add_dsp_shift(const freq_range_t &range, wax::obj dsp){
+    double codec_rate = dsp[DSP_PROP_CODEC_RATE].as<double>();
+    return freq_range_t(range.min - codec_rate/2.0, range.max + codec_rate/2.0);
+}
+
+/***********************************************************************
+ * Simple USRP Implementation
+ **********************************************************************/
+class single_usrp_impl : public single_usrp{
+public:
+    single_usrp_impl(const device_addr_t &addr){
+        _dev = device::make(addr);
+    }
+
+    ~single_usrp_impl(void){
+        /* NOP */
+    }
+
+    device::sptr get_device(void){
+        return _dev;
+    }
+
+    std::string get_pp_string(void){
+        std::string buff = str(boost::format(
+            "Single USRP:\n"
+            "  Device: %s\n"
+            "  Mboard: %s\n"
+        )
+            % (*_dev)[DEVICE_PROP_NAME].as<std::string>()
+            % _mboard()[MBOARD_PROP_NAME].as<std::string>()
+        );
+
+        //----------- rx side of life ----------------------------------
+        buff += str(boost::format(
+            "  RX DSP: %s\n"
+        )
+            % _rx_dsp()[DSP_PROP_NAME].as<std::string>()
+        );
+        for (size_t chan = 0; chan < this->get_rx_subdev_spec().size(); chan++){
+            buff += str(boost::format(
+                "  RX Channel: %u\n"
+                "    RX Dboard: %s\n"
+                "    RX Subdev: %s\n"
+            ) % chan
+                % _rx_dboard(chan)[DBOARD_PROP_NAME].as<std::string>()
+                % _rx_subdev(chan)[SUBDEV_PROP_NAME].as<std::string>()
+            );
+        }
+
+        //----------- tx side of life ----------------------------------
+        buff += str(boost::format(
+            "  TX DSP: %s\n"
+        )
+            % _tx_dsp()[DSP_PROP_NAME].as<std::string>()
+        );
+        for (size_t chan = 0; chan < this->get_tx_subdev_spec().size(); chan++){
+            buff += str(boost::format(
+                "  TX Channel: %u\n"
+                "    TX Dboard: %s\n"
+                "    TX Subdev: %s\n"
+            ) % chan
+                % _tx_dboard(chan)[DBOARD_PROP_NAME].as<std::string>()
+                % _tx_subdev(chan)[SUBDEV_PROP_NAME].as<std::string>()
+            );
+        }
+
+        return buff;
+    }
+
+    /*******************************************************************
+     * Misc
+     ******************************************************************/
+    time_spec_t get_time_now(void){
+        return _mboard()[MBOARD_PROP_TIME_NOW].as<time_spec_t>();
+    }
+
+    void set_time_now(const time_spec_t &time_spec){
+        _mboard()[MBOARD_PROP_TIME_NOW] = time_spec;
+    }
+
+    void set_time_next_pps(const time_spec_t &time_spec){
+        _mboard()[MBOARD_PROP_TIME_NEXT_PPS] = time_spec;
+    }
+
+    void issue_stream_cmd(const stream_cmd_t &stream_cmd){
+        _mboard()[MBOARD_PROP_STREAM_CMD] = stream_cmd;
+    }
+
+    void set_clock_config(const clock_config_t &clock_config){
+        _mboard()[MBOARD_PROP_CLOCK_CONFIG] = clock_config;
+    }
+
+    /*******************************************************************
+     * RX methods
+     ******************************************************************/
+    void set_rx_subdev_spec(const subdev_spec_t &spec){
+        _mboard()[MBOARD_PROP_RX_SUBDEV_SPEC] = spec;
+    }
+
+    subdev_spec_t get_rx_subdev_spec(void){
+        return _mboard()[MBOARD_PROP_RX_SUBDEV_SPEC].as<subdev_spec_t>();
+    }
+
+    void set_rx_rate(double rate){
+        _rx_dsp()[DSP_PROP_HOST_RATE] = rate;
+    }
+
+    double get_rx_rate(void){
+        return _rx_dsp()[DSP_PROP_HOST_RATE].as<double>();
+    }
+
+    tune_result_t set_rx_freq(double target_freq, size_t chan){
+        return tune_rx_subdev_and_dsp(_rx_subdev(chan), _rx_dsp(), chan, target_freq);
+    }
+
+    tune_result_t set_rx_freq(double target_freq, double lo_off, size_t chan){
+        return tune_rx_subdev_and_dsp(_rx_subdev(chan), _rx_dsp(), chan, target_freq, lo_off);
+    }
+
+    double get_rx_freq(size_t chan){
+        return derive_freq_from_rx_subdev_and_dsp(_rx_subdev(chan), _rx_dsp(), chan);
+    }
+
+    freq_range_t get_rx_freq_range(size_t chan){
+        return add_dsp_shift(_rx_subdev(chan)[SUBDEV_PROP_FREQ_RANGE].as<freq_range_t>(), _rx_dsp());
+    }
+
+    void set_rx_gain(float gain, size_t chan){
+        return _rx_gain_group(chan)->set_value(gain);
+    }
+
+    float get_rx_gain(size_t chan){
+        return _rx_gain_group(chan)->get_value();
+    }
+
+    gain_range_t get_rx_gain_range(size_t chan){
+        return _rx_gain_group(chan)->get_range();
+    }
+
+    void set_rx_antenna(const std::string &ant, size_t chan){
+        _rx_subdev(chan)[SUBDEV_PROP_ANTENNA] = ant;
+    }
+
+    std::string get_rx_antenna(size_t chan){
+        return _rx_subdev(chan)[SUBDEV_PROP_ANTENNA].as<std::string>();
+    }
+
+    std::vector<std::string> get_rx_antennas(size_t chan){
+        return _rx_subdev(chan)[SUBDEV_PROP_ANTENNA_NAMES].as<prop_names_t>();
+    }
+
+    bool get_rx_lo_locked(size_t chan){
+        return _rx_subdev(chan)[SUBDEV_PROP_LO_LOCKED].as<bool>();
+    }
+
+    float read_rssi(size_t chan){
+        return _rx_subdev(chan)[SUBDEV_PROP_RSSI].as<float>();
+    }
+
+    dboard_iface::sptr get_rx_dboard_iface(size_t chan){
+        return _rx_dboard(chan)[DBOARD_PROP_DBOARD_IFACE].as<dboard_iface::sptr>();
+    }
+
+    /*******************************************************************
+     * TX methods
+     ******************************************************************/
+    void set_tx_subdev_spec(const subdev_spec_t &spec){
+        _mboard()[MBOARD_PROP_TX_SUBDEV_SPEC] = spec;
+    }
+
+    subdev_spec_t get_tx_subdev_spec(void){
+        return _mboard()[MBOARD_PROP_TX_SUBDEV_SPEC].as<subdev_spec_t>();
+    }
+
+    void set_tx_rate(double rate){
+        _tx_dsp()[DSP_PROP_HOST_RATE] = rate;
+    }
+
+    double get_tx_rate(void){
+        return _tx_dsp()[DSP_PROP_HOST_RATE].as<double>();
+    }
+
+    tune_result_t set_tx_freq(double target_freq, size_t chan){
+        return tune_tx_subdev_and_dsp(_tx_subdev(chan), _tx_dsp(), chan, target_freq);
+    }
+
+    tune_result_t set_tx_freq(double target_freq, double lo_off, size_t chan){
+        return tune_tx_subdev_and_dsp(_tx_subdev(chan), _tx_dsp(), chan, target_freq, lo_off);
+    }
+
+    double get_tx_freq(size_t chan){
+        return derive_freq_from_tx_subdev_and_dsp(_tx_subdev(chan), _tx_dsp(), chan);
+    }
+
+    freq_range_t get_tx_freq_range(size_t chan){
+        return add_dsp_shift(_tx_subdev(chan)[SUBDEV_PROP_FREQ_RANGE].as<freq_range_t>(), _tx_dsp());
+    }
+
+    void set_tx_gain(float gain, size_t chan){
+        return _tx_gain_group(chan)->set_value(gain);
+    }
+
+    float get_tx_gain(size_t chan){
+        return _tx_gain_group(chan)->get_value();
+    }
+
+    gain_range_t get_tx_gain_range(size_t chan){
+        return _tx_gain_group(chan)->get_range();
+    }
+
+    void set_tx_antenna(const std::string &ant, size_t chan){
+        _tx_subdev(chan)[SUBDEV_PROP_ANTENNA] = ant;
+    }
+
+    std::string get_tx_antenna(size_t chan){
+        return _tx_subdev(chan)[SUBDEV_PROP_ANTENNA].as<std::string>();
+    }
+
+    std::vector<std::string> get_tx_antennas(size_t chan){
+        return _tx_subdev(chan)[SUBDEV_PROP_ANTENNA_NAMES].as<prop_names_t>();
+    }
+
+    bool get_tx_lo_locked(size_t chan){
+        return _tx_subdev(chan)[SUBDEV_PROP_LO_LOCKED].as<bool>();
+    }
+
+    dboard_iface::sptr get_tx_dboard_iface(size_t chan){
+        return _tx_dboard(chan)[DBOARD_PROP_DBOARD_IFACE].as<dboard_iface::sptr>();
+    }
+
+private:
+    device::sptr _dev;
+    wax::obj _mboard(void){
+        return (*_dev)[DEVICE_PROP_MBOARD];
+    }
+    wax::obj _rx_dsp(void){
+        return _mboard()[MBOARD_PROP_RX_DSP];
+    }
+    wax::obj _tx_dsp(void){
+        return _mboard()[MBOARD_PROP_TX_DSP];
+    }
+    wax::obj _rx_dboard(size_t chan){
+        std::string db_name = this->get_rx_subdev_spec().at(chan).db_name;
+        return _mboard()[named_prop_t(MBOARD_PROP_RX_DBOARD, db_name)];
+    }
+    wax::obj _tx_dboard(size_t chan){
+        std::string db_name = this->get_tx_subdev_spec().at(chan).db_name;
+        return _mboard()[named_prop_t(MBOARD_PROP_TX_DBOARD, db_name)];
+    }
+    wax::obj _rx_subdev(size_t chan){
+        std::string sd_name = this->get_rx_subdev_spec().at(chan).sd_name;
+        return _rx_dboard(chan)[named_prop_t(DBOARD_PROP_SUBDEV, sd_name)];
+    }
+    wax::obj _tx_subdev(size_t chan){
+        std::string sd_name = this->get_tx_subdev_spec().at(chan).sd_name;
+        return _tx_dboard(chan)[named_prop_t(DBOARD_PROP_SUBDEV, sd_name)];
+    }
+    gain_group::sptr _rx_gain_group(size_t chan){
+        std::string sd_name = this->get_rx_subdev_spec().at(chan).sd_name;
+        return _rx_dboard(chan)[named_prop_t(DBOARD_PROP_GAIN_GROUP, sd_name)].as<gain_group::sptr>();
+    }
+    gain_group::sptr _tx_gain_group(size_t chan){
+        std::string sd_name = this->get_tx_subdev_spec().at(chan).sd_name;
+        return _tx_dboard(chan)[named_prop_t(DBOARD_PROP_GAIN_GROUP, sd_name)].as<gain_group::sptr>();
+    }
+};
+
+/***********************************************************************
+ * The Make Function
+ **********************************************************************/
+single_usrp::sptr single_usrp::make(const device_addr_t &dev_addr){
+    return sptr(new single_usrp_impl(dev_addr));
+}
diff --git a/host/lib/usrp/tune_helper.cpp b/host/lib/usrp/tune_helper.cpp
index e516477d3..7633c67f2 100644
--- a/host/lib/usrp/tune_helper.cpp
+++ b/host/lib/usrp/tune_helper.cpp
@@ -30,11 +30,12 @@ using namespace uhd::usrp;
  **********************************************************************/
 static tune_result_t tune_xx_subdev_and_dxc(
     dboard_iface::unit_t unit,
-    wax::obj subdev, wax::obj dxc,
+    wax::obj subdev, wax::obj dxc, size_t chan,
     double target_freq, double lo_offset
 ){
     wax::obj subdev_freq_proxy = subdev[SUBDEV_PROP_FREQ];
-    wax::obj dxc_freq_proxy = dxc[DSP_PROP_FREQ_SHIFT];
+    std::string freq_name = dxc[DSP_PROP_FREQ_SHIFT_NAMES].as<prop_names_t>().at(chan);
+    wax::obj dxc_freq_proxy = dxc[named_prop_t(DSP_PROP_FREQ_SHIFT, freq_name)];
     double dxc_sample_rate = dxc[DSP_PROP_CODEC_RATE].as<double>();
 
     // Ask the d'board to tune as closely as it can to target_freq+lo_offset
@@ -65,11 +66,12 @@ static tune_result_t tune_xx_subdev_and_dxc(
 
 static double derive_freq_from_xx_subdev_and_dxc(
     dboard_iface::unit_t unit,
-    wax::obj subdev, wax::obj dxc
+    wax::obj subdev, wax::obj dxc, size_t chan
 ){
     //extract actual dsp and IF frequencies
     double actual_inter_freq = subdev[SUBDEV_PROP_FREQ].as<double>();
-    double actual_dxc_freq = dxc[DSP_PROP_FREQ_SHIFT].as<double>();
+    std::string freq_name = dxc[DSP_PROP_FREQ_SHIFT_NAMES].as<prop_names_t>().at(chan);
+    double actual_dxc_freq = dxc[named_prop_t(DSP_PROP_FREQ_SHIFT, freq_name)].as<double>();
 
     //invert the sign on the dxc freq given the following conditions
     if (unit == dboard_iface::UNIT_TX) actual_dxc_freq *= -1.0;
@@ -81,50 +83,54 @@ static double derive_freq_from_xx_subdev_and_dxc(
  * RX Tune
  **********************************************************************/
 tune_result_t usrp::tune_rx_subdev_and_dsp(
-    wax::obj subdev, wax::obj ddc,
+    wax::obj subdev, wax::obj ddc, size_t chan,
     double target_freq, double lo_offset
 ){
-    return tune_xx_subdev_and_dxc(dboard_iface::UNIT_RX, subdev, ddc, target_freq, lo_offset);
+    return tune_xx_subdev_and_dxc(dboard_iface::UNIT_RX, subdev, ddc, chan, target_freq, lo_offset);
 }
 
 tune_result_t usrp::tune_rx_subdev_and_dsp(
     wax::obj subdev, wax::obj ddc,
-    double target_freq
+    size_t chan, double target_freq
 ){
     double lo_offset = 0.0;
     //if the local oscillator will be in the passband, use an offset
     if (subdev[SUBDEV_PROP_USE_LO_OFFSET].as<bool>()){
         lo_offset = 2.0*ddc[DSP_PROP_HOST_RATE].as<double>();
     }
-    return tune_rx_subdev_and_dsp(subdev, ddc, target_freq, lo_offset);
+    return tune_rx_subdev_and_dsp(subdev, ddc, chan, target_freq, lo_offset);
 }
 
-double usrp::derive_freq_from_rx_subdev_and_dsp(wax::obj subdev, wax::obj ddc){
-    return derive_freq_from_xx_subdev_and_dxc(dboard_iface::UNIT_RX, subdev, ddc);
+double usrp::derive_freq_from_rx_subdev_and_dsp(
+    wax::obj subdev, wax::obj ddc, size_t chan
+){
+    return derive_freq_from_xx_subdev_and_dxc(dboard_iface::UNIT_RX, subdev, ddc, chan);
 }
 
 /***********************************************************************
  * TX Tune
  **********************************************************************/
 tune_result_t usrp::tune_tx_subdev_and_dsp(
-    wax::obj subdev, wax::obj duc,
+    wax::obj subdev, wax::obj duc, size_t chan,
     double target_freq, double lo_offset
 ){
-    return tune_xx_subdev_and_dxc(dboard_iface::UNIT_TX, subdev, duc, target_freq, lo_offset);
+    return tune_xx_subdev_and_dxc(dboard_iface::UNIT_TX, subdev, duc, chan, target_freq, lo_offset);
 }
 
 tune_result_t usrp::tune_tx_subdev_and_dsp(
     wax::obj subdev, wax::obj duc,
-    double target_freq
+    size_t chan, double target_freq
 ){
     double lo_offset = 0.0;
     //if the local oscillator will be in the passband, use an offset
     if (subdev[SUBDEV_PROP_USE_LO_OFFSET].as<bool>()){
         lo_offset = 2.0*duc[DSP_PROP_HOST_RATE].as<double>();
     }
-    return tune_tx_subdev_and_dsp(subdev, duc, target_freq, lo_offset);
+    return tune_tx_subdev_and_dsp(subdev, duc, chan, target_freq, lo_offset);
 }
 
-double usrp::derive_freq_from_tx_subdev_and_dsp(wax::obj subdev, wax::obj duc){
-    return derive_freq_from_xx_subdev_and_dxc(dboard_iface::UNIT_TX, subdev, duc);
+double usrp::derive_freq_from_tx_subdev_and_dsp(
+    wax::obj subdev, wax::obj duc, size_t chan
+){
+    return derive_freq_from_xx_subdev_and_dxc(dboard_iface::UNIT_TX, subdev, duc, chan);
 }
diff --git a/host/lib/usrp/usrp1/dsp_impl.cpp b/host/lib/usrp/usrp1/dsp_impl.cpp
index d5a88fa2d..573bce21f 100644
--- a/host/lib/usrp/usrp1/dsp_impl.cpp
+++ b/host/lib/usrp/usrp1/dsp_impl.cpp
@@ -21,6 +21,8 @@
 #include <uhd/usrp/dsp_props.hpp>
 #include <boost/bind.hpp>
 #include <boost/format.hpp>
+#include <boost/lexical_cast.hpp>
+#include <boost/assign/list_of.hpp>
 #include <iostream>
 #include <cmath>
 
@@ -42,11 +44,15 @@ void usrp1_impl::rx_dsp_init(void)
 /***********************************************************************
  * RX DDC Get
  **********************************************************************/
-void usrp1_impl::rx_dsp_get(const wax::obj &key, wax::obj &val)
-{
+void usrp1_impl::rx_dsp_get(const wax::obj &key_, wax::obj &val){
+    named_prop_t key = named_prop_t::extract(key_);
+
     switch(key.as<dsp_prop_t>()){
     case DSP_PROP_NAME:
-        val = std::string("usrp1 ddc0");
+        val = str(boost::format("usrp1 ddc %uX %s")
+            % this->get_num_ddcs()
+            % (this->has_rx_halfband()? "+ hb" : "")
+        );
         return;
 
     case DSP_PROP_OTHERS:
@@ -54,7 +60,16 @@ void usrp1_impl::rx_dsp_get(const wax::obj &key, wax::obj &val)
         return;
 
     case DSP_PROP_FREQ_SHIFT:
-        val = _rx_dsp_freq;
+        val = _rx_dsp_freqs[key.name];
+        return;
+
+    case DSP_PROP_FREQ_SHIFT_NAMES:{
+            prop_names_t names;
+            for(size_t i = 0; i < this->get_num_ddcs(); i++){
+                names.push_back(boost::lexical_cast<std::string>(i));
+            }
+            val = names;
+        }
         return;
 
     case DSP_PROP_CODEC_RATE:
@@ -73,25 +88,22 @@ void usrp1_impl::rx_dsp_get(const wax::obj &key, wax::obj &val)
 /***********************************************************************
  * RX DDC Set
  **********************************************************************/
-void usrp1_impl::rx_dsp_set(const wax::obj &key, const wax::obj &val)
-{
+void usrp1_impl::rx_dsp_set(const wax::obj &key_, const wax::obj &val){
+    named_prop_t key = named_prop_t::extract(key_);
+
     switch(key.as<dsp_prop_t>()) {
     case DSP_PROP_FREQ_SHIFT: {
             double new_freq = val.as<double>();
             boost::uint32_t reg_word = dsp_type1::calc_cordic_word_and_update(
                 new_freq, _clock_ctrl->get_master_clock_freq());
 
-            //TODO TODO TODO TODO TODO TODO TODO TODO TODO 
-            //
-            // Handle multiple receive channels / DDC's
-            //
-            //TODO TODO TODO TODO TODO TODO TODO TODO TODO
-            _iface->poke32(FR_RX_FREQ_0, reg_word);
-            _iface->poke32(FR_RX_FREQ_1, reg_word);
-            _iface->poke32(FR_RX_FREQ_2, reg_word);
-            _iface->poke32(FR_RX_FREQ_3, reg_word);
-
-            _rx_dsp_freq = new_freq;
+            static const uhd::dict<std::string, boost::uint32_t>
+            freq_name_to_reg_val = boost::assign::map_list_of
+                ("0", FR_RX_FREQ_0) ("1", FR_RX_FREQ_1)
+                ("2", FR_RX_FREQ_2) ("3", FR_RX_FREQ_3)
+            ;
+            _iface->poke32(freq_name_to_reg_val[key.name], reg_word);
+            _rx_dsp_freqs[key.name] = new_freq;
             return;
         }
     case DSP_PROP_HOST_RATE: {
@@ -133,11 +145,15 @@ void usrp1_impl::tx_dsp_init(void)
 /***********************************************************************
  * TX DUC Get
  **********************************************************************/
-void usrp1_impl::tx_dsp_get(const wax::obj &key, wax::obj &val)
-{
+void usrp1_impl::tx_dsp_get(const wax::obj &key_, wax::obj &val){
+    named_prop_t key = named_prop_t::extract(key_);
+
     switch(key.as<dsp_prop_t>()) {
     case DSP_PROP_NAME:
-        val = std::string("usrp1 duc0");
+        val = str(boost::format("usrp1 duc %uX %s")
+            % this->get_num_ducs()
+            % (this->has_tx_halfband()? "+ hb" : "")
+        );
         return;
 
     case DSP_PROP_OTHERS:
@@ -145,7 +161,16 @@ void usrp1_impl::tx_dsp_get(const wax::obj &key, wax::obj &val)
         return;
 
     case DSP_PROP_FREQ_SHIFT:
-        val = _tx_dsp_freq;
+        val = _tx_dsp_freqs[key.name];
+        return;
+
+    case DSP_PROP_FREQ_SHIFT_NAMES:{
+            prop_names_t names;
+            for(size_t i = 0; i < this->get_num_ducs(); i++){
+                names.push_back(boost::lexical_cast<std::string>(i));
+            }
+            val = names;
+        }
         return;
 
     case DSP_PROP_CODEC_RATE:
@@ -164,20 +189,20 @@ void usrp1_impl::tx_dsp_get(const wax::obj &key, wax::obj &val)
 /***********************************************************************
  * TX DUC Set
  **********************************************************************/
-void usrp1_impl::tx_dsp_set(const wax::obj &key, const wax::obj &val)
-{
+void usrp1_impl::tx_dsp_set(const wax::obj &key_, const wax::obj &val){
+    named_prop_t key = named_prop_t::extract(key_);
+
     switch(key.as<dsp_prop_t>()) {
 
-    //TODO TODO TODO TODO TODO TODO TODO TODO TODO TODO TODO TODO
-    //
-    // Set both codec frequencies until we have duality properties 
-    //
-    //TODO TODO TODO TODO TODO TODO TODO TODO TODO TODO TODO TODO
     case DSP_PROP_FREQ_SHIFT: {
             double new_freq = val.as<double>();
-            _codec_ctrls[DBOARD_SLOT_A]->set_duc_freq(new_freq);
-            _codec_ctrls[DBOARD_SLOT_B]->set_duc_freq(new_freq);
-            _tx_dsp_freq = new_freq;
+
+            //map the freq shift key to a subdev spec to a particular codec chip
+            std::string db_name = _tx_subdev_spec.at(boost::lexical_cast<size_t>(key.name)).db_name;
+            if (db_name == "A") _codec_ctrls[DBOARD_SLOT_A]->set_duc_freq(new_freq);
+            if (db_name == "B") _codec_ctrls[DBOARD_SLOT_B]->set_duc_freq(new_freq);
+
+            _tx_dsp_freqs[key.name] = new_freq;
             return;
         }
 
diff --git a/host/lib/usrp/usrp1/io_impl.cpp b/host/lib/usrp/usrp1/io_impl.cpp
index 92e8bc20a..146038bd9 100644
--- a/host/lib/usrp/usrp1/io_impl.cpp
+++ b/host/lib/usrp/usrp1/io_impl.cpp
@@ -33,294 +33,283 @@ using namespace uhd::usrp;
 using namespace uhd::transport;
 namespace asio = boost::asio;
 
-struct usrp1_send_state {
-    uhd::transport::managed_send_buffer::sptr send_buff;
-    size_t bytes_written;
-    size_t underrun_poll_samp_count;
-
-    size_t bytes_free()
+/***********************************************************************
+ * Pseudo send buffer implementation
+ **********************************************************************/
+class pseudo_managed_send_buffer : public managed_send_buffer{
+public:
+
+    pseudo_managed_send_buffer(
+        const boost::asio::mutable_buffer &buff,
+        const boost::function<ssize_t(size_t)> &commit
+    ):
+        _buff(buff),
+        _commit(commit)
     {
-        if (send_buff != NULL)
-            return send_buff->size() - bytes_written;
-        else
-            return 0;
+        /* NOP */
     }
-};
 
-struct usrp1_recv_state {
-    uhd::transport::managed_recv_buffer::sptr recv_buff;
-    size_t bytes_read;
-    size_t overrun_poll_samp_count;
+    ssize_t commit(size_t num_bytes){
+        return _commit(num_bytes);
+    }
 
-    size_t bytes_avail()
-    {
-        if (recv_buff != NULL)
-            return recv_buff->size() - bytes_read;
-        else
-            return 0;
+private:
+    const boost::asio::mutable_buffer &get(void) const{
+        return _buff;
     }
-};
 
-/***********************************************************************
- * IO Implementation Details
- **********************************************************************/
-struct usrp1_impl::io_impl {
-    io_impl();
-    ~io_impl(void);
-
-    //state handling for buffer management 
-    usrp1_recv_state recv_state;
-    usrp1_send_state send_state;
-
-    //send transport management 
-    bool get_send_buffer(zero_copy_if::sptr zc_if);
-    size_t copy_convert_send_samps(const void *buff, size_t num_samps,
-                              size_t sample_offset, const io_type_t io_type,
-                              otw_type_t otw_type);
-    bool conditional_buff_commit(bool force);
-    bool check_underrun(usrp_ctrl::sptr ctrl_if,
-                        size_t poll_interval, bool force);
-
-    //recv transport management 
-    bool get_recv_buffer(zero_copy_if::sptr zc_if);
-    size_t copy_convert_recv_samps(void *buff, size_t num_samps,
-                              size_t sample_offset, const io_type_t io_type,
-                              otw_type_t otw_type);
-    bool check_overrun(usrp_ctrl::sptr ctrl_if,
-                        size_t poll_interval, bool force);
+    const boost::asio::mutable_buffer      _buff;
+    const boost::function<ssize_t(size_t)> _commit;
 };
 
-usrp1_impl::io_impl::io_impl()
-{
-    send_state.send_buff = uhd::transport::managed_send_buffer::sptr();
-    recv_state.recv_buff = uhd::transport::managed_recv_buffer::sptr();
-}
-
-usrp1_impl::io_impl::~io_impl(void)
-{
-   /* NOP */
-}
-
-void usrp1_impl::io_init(void)
-{
-    _rx_otw_type.width = 16;
-    _rx_otw_type.shift = 0;
-    _rx_otw_type.byteorder = otw_type_t::BO_LITTLE_ENDIAN;
-
-    _tx_otw_type.width = 16;
-    _tx_otw_type.shift = 0;
-    _tx_otw_type.byteorder = otw_type_t::BO_LITTLE_ENDIAN;
-
-    _io_impl = UHD_PIMPL_MAKE(io_impl, ());
-}
-
 /***********************************************************************
- * Data Send
+ * IO Implementation Details
  **********************************************************************/
-bool usrp1_impl::io_impl::get_send_buffer(zero_copy_if::sptr zc_if)
-{
-    if (send_state.send_buff == NULL) {
+struct usrp1_impl::io_impl{
+    io_impl(zero_copy_if::sptr data_transport):
+        data_transport(data_transport),
+        underflow_poll_samp_count(0),
+        overflow_poll_samp_count(0),
+        send_buff(data_transport->get_send_buff()),
+        num_bytes_committed(0)
+    {
+        /* NOP */
+    }
 
-        send_state.send_buff = zc_if->get_send_buff();
-        if (send_state.send_buff == NULL)
-            return false;
+    ~io_impl(void){
+        flush_send_buff();
+    }
 
-        send_state.bytes_written = 0;
+    zero_copy_if::sptr data_transport;
+
+    //state management for the vrt packet handler code
+    vrt_packet_handler::recv_state packet_handler_recv_state;
+    vrt_packet_handler::send_state packet_handler_send_state;
+
+    //state management for overflow and underflow
+    size_t underflow_poll_samp_count;
+    size_t overflow_poll_samp_count;
+
+    //wrapper around the actual send buffer interface
+    //all of this to ensure only full buffers are committed
+    managed_send_buffer::sptr send_buff;
+    size_t num_bytes_committed;
+    boost::uint8_t pseudo_buff[BYTES_PER_PACKET];
+    ssize_t phony_commit_pseudo_buff(size_t num_bytes);
+    ssize_t phony_commit_send_buff(size_t num_bytes);
+    ssize_t commit_send_buff(void);
+    void flush_send_buff(void);
+    bool get_send_buffs(vrt_packet_handler::managed_send_buffs_t &);
+
+    //helpers to get at the send buffer + offset
+    inline void *get_send_mem_ptr(void){
+        return send_buff->cast<boost::uint8_t *>() + num_bytes_committed;
+    }
+    inline size_t get_send_mem_size(void){
+        return send_buff->size() - num_bytes_committed;
     }
+};
 
-    return true;
+/*!
+ * Accept a commit of num bytes to the pseudo buffer.
+ * Memcpy the entire contents of pseudo buffer into send buffers.
+ *
+ * Under most conditions:
+ *   The first loop iteration will fill the remainder of the send buffer.
+ *   The second loop iteration will empty the pseudo buffer remainder.
+ */
+ssize_t usrp1_impl::io_impl::phony_commit_pseudo_buff(size_t num_bytes){
+    size_t bytes_to_copy = num_bytes, bytes_copied = 0;
+    while(bytes_to_copy){
+        size_t bytes_copied_here = std::min(bytes_to_copy, get_send_mem_size());
+        std::memcpy(get_send_mem_ptr(), pseudo_buff + bytes_copied, bytes_copied_here);
+        ssize_t ret = phony_commit_send_buff(bytes_copied_here);
+        if (ret < 0) return ret;
+        bytes_to_copy -= ret;
+        bytes_copied += ret;
+    }
+    return bytes_copied;
 }
 
-size_t usrp1_impl::io_impl::copy_convert_send_samps(const void *buff,
-                                                    size_t num_samps,
-                                                    size_t sample_offset,
-                                                    const io_type_t io_type,
-                                                    otw_type_t otw_type)
-{
-    UHD_ASSERT_THROW(send_state.bytes_free() % otw_type.get_sample_size() == 0);
-
-    size_t samps_free = send_state.bytes_free() / otw_type.get_sample_size();
-    size_t copy_samps = std::min(num_samps - sample_offset, samps_free); 
-
-    const boost::uint8_t *io_mem =
-        reinterpret_cast<const boost::uint8_t *>(buff);
-
-    boost::uint8_t *otw_mem = send_state.send_buff->cast<boost::uint8_t *>();
-
-    convert_io_type_to_otw_type(io_mem + sample_offset * io_type.size,
-                                io_type,
-                                otw_mem + send_state.bytes_written,
-                                otw_type,
-                                copy_samps);
-
-    send_state.bytes_written += copy_samps * otw_type.get_sample_size();
-    send_state.underrun_poll_samp_count += copy_samps;
-
-    return copy_samps;
+/*!
+ * Accept a commit of num bytes to the send buffer.
+ * Conditionally commit the send buffer if full.
+ */
+ssize_t usrp1_impl::io_impl::phony_commit_send_buff(size_t num_bytes){
+    num_bytes_committed += num_bytes;
+    if (num_bytes_committed != send_buff->size()) return num_bytes;
+    ssize_t ret = commit_send_buff();
+    return (ret < 0)? ret : num_bytes;
 }
 
-bool usrp1_impl::io_impl::conditional_buff_commit(bool force)
-{
-    if (send_state.bytes_written % 512)
-        return false;
-
-    if (force || send_state.bytes_free() == 0) {
-        send_state.send_buff->commit(send_state.bytes_written);
-        send_state.send_buff = uhd::transport::managed_send_buffer::sptr();
-        return true;
-    }
-    
-    return false;
+/*!
+ * Flush the send buffer:
+ * Zero-pad the send buffer to the nearest 512 byte boundary and commit.
+ */
+void usrp1_impl::io_impl::flush_send_buff(void){
+    size_t bytes_to_pad = (-1*num_bytes_committed)%512;
+    std::memset(get_send_mem_ptr(), 0, bytes_to_pad);
+    num_bytes_committed += bytes_to_pad;
+    commit_send_buff();
 }
 
-bool usrp1_impl::io_impl::check_underrun(usrp_ctrl::sptr ctrl_if,
-                                         size_t poll_interval,
-                                         bool force)
-{
-    unsigned char underrun = 0;
-
-    bool ready_to_poll = send_state.underrun_poll_samp_count > poll_interval;
-
-    if (force || ready_to_poll) {
-        int ret = ctrl_if->usrp_control_read(VRQ_GET_STATUS,
-                                             0,
-                                             GS_TX_UNDERRUN,
-                                             &underrun, sizeof(char));
-        if (ret < 0)
-            std::cerr << "USRP: underrun check failed" << std::endl;
-        if (underrun)
-            std::cerr << "U" << std::flush;
-
-        send_state.underrun_poll_samp_count = 0;
-    }
-
-    return (bool) underrun;
+/*!
+ * Perform an actual commit on the send buffer:
+ * Commit the contents of the send buffer and request a new buffer.
+ */
+ssize_t usrp1_impl::io_impl::commit_send_buff(void){
+    ssize_t ret = send_buff->commit(num_bytes_committed);
+    send_buff = data_transport->get_send_buff();
+    num_bytes_committed = 0;
+    return ret;
 }
 
-size_t usrp1_impl::send(const std::vector<const void *> &buffs,
-                        size_t num_samps,
-                        const tx_metadata_t &,
-                        const io_type_t &io_type,
-                        send_mode_t)
-{
+bool usrp1_impl::io_impl::get_send_buffs(
+    vrt_packet_handler::managed_send_buffs_t &buffs
+){
     UHD_ASSERT_THROW(buffs.size() == 1);
 
-    size_t total_samps_sent = 0;
-
-    while (total_samps_sent < num_samps) {
-        if (!_io_impl->get_send_buffer(_data_transport))
-            return 0;
-
-        total_samps_sent += _io_impl->copy_convert_send_samps(buffs[0],
-                                                              num_samps,
-                                                              total_samps_sent,
-                                                              io_type,
-                                                              _tx_otw_type);
-        if (total_samps_sent == num_samps)
-            _io_impl->conditional_buff_commit(true);
-        else
-            _io_impl->conditional_buff_commit(false);
-
-        _io_impl->check_underrun(_ctrl_transport,
-                                 _tx_samps_per_poll_interval, false);
+    //not enough bytes free -> use the pseudo buffer
+    if (get_send_mem_size() < BYTES_PER_PACKET){
+        buffs[0] = managed_send_buffer::sptr(new pseudo_managed_send_buffer(
+            boost::asio::buffer(pseudo_buff),
+            boost::bind(&usrp1_impl::io_impl::phony_commit_pseudo_buff, this, _1)
+        ));
+    }
+    //otherwise use the send buffer offset by the bytes written
+    else{
+        buffs[0] = managed_send_buffer::sptr(new pseudo_managed_send_buffer(
+            boost::asio::buffer(get_send_mem_ptr(), get_send_mem_size()),
+            boost::bind(&usrp1_impl::io_impl::phony_commit_send_buff, this, _1)
+        ));
     }
 
-    return total_samps_sent;
+    return buffs[0].get();
 }
 
 /***********************************************************************
- * Data Recv
+ * Initialize internals within this file
  **********************************************************************/
-bool usrp1_impl::io_impl::get_recv_buffer(zero_copy_if::sptr zc_if)
-{
-    if ((recv_state.recv_buff == NULL) || (recv_state.bytes_avail() == 0)) {
-
-        recv_state.recv_buff = zc_if->get_recv_buff();
-        if (recv_state.recv_buff == NULL)
-            return false;
+void usrp1_impl::io_init(void){
+    _rx_otw_type.width = 16;
+    _rx_otw_type.shift = 0;
+    _rx_otw_type.byteorder = otw_type_t::BO_LITTLE_ENDIAN;
 
-        recv_state.bytes_read = 0;
-    }
+    _tx_otw_type.width = 16;
+    _tx_otw_type.shift = 0;
+    _tx_otw_type.byteorder = otw_type_t::BO_LITTLE_ENDIAN;
 
-    return true;
+    _io_impl = UHD_PIMPL_MAKE(io_impl, (_data_transport));
 }
 
-size_t usrp1_impl::io_impl::copy_convert_recv_samps(void *buff,
-                                                    size_t num_samps,
-                                                    size_t sample_offset,
-                                                    const io_type_t io_type,
-                                                    otw_type_t otw_type)
-{
-    UHD_ASSERT_THROW(recv_state.bytes_avail() % otw_type.get_sample_size() == 0);
-
-    size_t samps_avail = recv_state.bytes_avail() / otw_type.get_sample_size();
-    size_t copy_samps = std::min(num_samps - sample_offset, samps_avail); 
-
-    const boost::uint8_t *otw_mem =
-        recv_state.recv_buff->cast<const boost::uint8_t *>();
-
-    boost::uint8_t *io_mem = reinterpret_cast<boost::uint8_t *>(buff);
-
-    convert_otw_type_to_io_type(otw_mem + recv_state.bytes_read,
-                                otw_type,
-                                io_mem + sample_offset * io_type.size,
-                                io_type,
-                                copy_samps);
-
-    recv_state.bytes_read += copy_samps * otw_type.get_sample_size();
-    recv_state.overrun_poll_samp_count += copy_samps;
-
-    return copy_samps;
+/***********************************************************************
+ * Data send + helper functions
+ **********************************************************************/
+static void usrp1_bs_vrt_packer(
+    boost::uint32_t *,
+    vrt::if_packet_info_t &if_packet_info
+){
+    if_packet_info.num_header_words32 = 0;
+    if_packet_info.num_packet_words32 = if_packet_info.num_payload_words32;
 }
 
-bool usrp1_impl::io_impl::check_overrun(usrp_ctrl::sptr ctrl_if,
-                                        size_t poll_interval,
-                                        bool force)
-{
-    unsigned char overrun = 0;
-
-    bool ready_to_poll = recv_state.overrun_poll_samp_count > poll_interval;
-
-    if (force || ready_to_poll) {
-        int ret = ctrl_if->usrp_control_read(VRQ_GET_STATUS,
-                                             0,
-                                             GS_RX_OVERRUN,
-                                             &overrun, sizeof(char));
-        if (ret < 0)
-            std::cerr << "USRP: overrrun check failed" << std::endl;
-        if (overrun)
-            std::cerr << "O" << std::flush;
-
-        recv_state.overrun_poll_samp_count = 0;
+size_t usrp1_impl::send(
+    const std::vector<const void *> &buffs, size_t num_samps,
+    const tx_metadata_t &metadata, const io_type_t &io_type,
+    send_mode_t send_mode
+){
+    size_t num_samps_sent = vrt_packet_handler::send(
+        _io_impl->packet_handler_send_state,       //last state of the send handler
+        buffs, num_samps,                          //buffer to fill
+        metadata, send_mode,                       //samples metadata
+        io_type, _tx_otw_type,                     //input and output types to convert
+        _clock_ctrl->get_master_clock_freq(),      //master clock tick rate
+        &usrp1_bs_vrt_packer,
+        boost::bind(&usrp1_impl::io_impl::get_send_buffs, _io_impl.get(), _1),
+        get_max_send_samps_per_packet(),
+        0,                                         //vrt header offset
+        _tx_subdev_spec.size()                     //num channels
+    );
+
+    //Don't honor sob because it is normal to be always bursting...
+    //handle eob flag (commit the buffer)
+    if (metadata.end_of_burst) _io_impl->flush_send_buff();
+
+    //handle the polling for underflow conditions
+    _io_impl->underflow_poll_samp_count += num_samps_sent;
+    if (_io_impl->underflow_poll_samp_count >= _tx_samps_per_poll_interval){
+        _io_impl->underflow_poll_samp_count = 0; //reset count
+        boost::uint8_t underflow = 0;
+        ssize_t ret = _ctrl_transport->usrp_control_read(
+            VRQ_GET_STATUS, 0, GS_TX_UNDERRUN,
+            &underflow, sizeof(underflow)
+        );
+        if (ret < 0)        std::cerr << "USRP: underflow check failed" << std::endl;
+        else if (underflow) std::cerr << "U" << std::flush;
     }
 
-    return (bool) overrun;
+    return num_samps_sent;
 }
 
-size_t usrp1_impl::recv(const std::vector<void *> &buffs,
-                        size_t num_samps,
-                        rx_metadata_t &,
-                        const io_type_t &io_type,
-                        recv_mode_t,
-                        size_t)
-{
-    UHD_ASSERT_THROW(buffs.size() == 1);
-
-    size_t total_samps_recv = 0;
-
-    while (total_samps_recv < num_samps) {
+/***********************************************************************
+ * Data recv + helper functions
+ **********************************************************************/
+static void usrp1_bs_vrt_unpacker(
+    const boost::uint32_t *,
+    vrt::if_packet_info_t &if_packet_info
+){
+    if_packet_info.packet_type = vrt::if_packet_info_t::PACKET_TYPE_DATA;
+    if_packet_info.num_payload_words32 = if_packet_info.num_packet_words32;
+    if_packet_info.num_header_words32 = 0;
+    if_packet_info.packet_count = 0;
+    if_packet_info.sob = false;
+    if_packet_info.eob = false;
+    if_packet_info.has_sid = false;
+    if_packet_info.has_cid = false;
+    if_packet_info.has_tsi = false;
+    if_packet_info.has_tsf = false;
+    if_packet_info.has_tlr = false;
+}
 
-        if (!_io_impl->get_recv_buffer(_data_transport))
-            return 0;
+static bool get_recv_buffs(
+    zero_copy_if::sptr zc_if,
+    vrt_packet_handler::managed_recv_buffs_t &buffs
+){
+    UHD_ASSERT_THROW(buffs.size() == 1);
+    buffs[0] = zc_if->get_recv_buff();
+    return buffs[0].get();
+}
 
-        total_samps_recv += _io_impl->copy_convert_recv_samps(buffs[0],
-                                                              num_samps,
-                                                              total_samps_recv,
-                                                              io_type,
-                                                              _rx_otw_type);
-        _io_impl->check_overrun(_ctrl_transport,
-                                _rx_samps_per_poll_interval, false);
+size_t usrp1_impl::recv(
+    const std::vector<void *> &buffs, size_t num_samps,
+    rx_metadata_t &metadata, const io_type_t &io_type,
+    recv_mode_t recv_mode, size_t /*timeout_ms TODO*/
+){
+    size_t num_samps_recvd = vrt_packet_handler::recv(
+        _io_impl->packet_handler_recv_state,       //last state of the recv handler
+        buffs, num_samps,                          //buffer to fill
+        metadata, recv_mode,                       //samples metadata
+        io_type, _rx_otw_type,                     //input and output types to convert
+        _clock_ctrl->get_master_clock_freq(),      //master clock tick rate
+        &usrp1_bs_vrt_unpacker,
+        boost::bind(&get_recv_buffs, _data_transport, _1),
+        &vrt_packet_handler::handle_overflow_nop,
+        0,                                         //vrt header offset
+        _rx_subdev_spec.size()                     //num channels
+    );
+
+    //handle the polling for overflow conditions
+    _io_impl->overflow_poll_samp_count += num_samps_recvd;
+    if (_io_impl->overflow_poll_samp_count >= _rx_samps_per_poll_interval){
+        _io_impl->overflow_poll_samp_count = 0; //reset count
+        boost::uint8_t overflow = 0;
+        ssize_t ret = _ctrl_transport->usrp_control_read(
+            VRQ_GET_STATUS, 0, GS_RX_OVERRUN,
+            &overflow, sizeof(overflow)
+        );
+        if (ret < 0)       std::cerr << "USRP: overflow check failed" << std::endl;
+        else if (overflow) std::cerr << "O" << std::flush;
     }
 
-    return total_samps_recv; 
+    return num_samps_recvd;
 }
diff --git a/host/lib/usrp/usrp1/mboard_impl.cpp b/host/lib/usrp/usrp1/mboard_impl.cpp
index a90532cb8..fe3774eb4 100644
--- a/host/lib/usrp/usrp1/mboard_impl.cpp
+++ b/host/lib/usrp/usrp1/mboard_impl.cpp
@@ -36,6 +36,8 @@
 using namespace uhd;
 using namespace uhd::usrp;
 
+static const bool usrp1_mboard_verbose = false;
+
 /***********************************************************************
  * Calculate the RX mux value:
  *    The I and Q mux values are intentionally reversed to flip I and Q
@@ -146,6 +148,7 @@ static boost::uint32_t calc_tx_mux(
 
     //calculate the channel flags
     int channel_flags = 0, chan = 0;
+    uhd::dict<std::string, int> slot_to_chan_count = boost::assign::map_list_of("A", 0)("B", 0);
     BOOST_FOREACH(const subdev_spec_pair_t &pair, subdev_spec){
         wax::obj dboard = mboard[named_prop_t(MBOARD_PROP_TX_DBOARD, pair.db_name)];
         wax::obj subdev = dboard[named_prop_t(DBOARD_PROP_SUBDEV, pair.sd_name)];
@@ -155,6 +158,14 @@ static boost::uint32_t calc_tx_mux(
         if (pair.db_name == "A") channel_flags |= chan_to_conn_to_flag[chan][conn] << 0;
         if (pair.db_name == "B") channel_flags |= chan_to_conn_to_flag[chan][conn] << 8;
 
+        //sanity check, only 1 channel per slot
+        slot_to_chan_count[pair.db_name]++;
+        if (slot_to_chan_count[pair.db_name] > 1){
+            throw std::runtime_error(str(boost::format(
+                "dboard slot %s assigned to multiple channels in subdev spec %s"
+            ) % pair.db_name % subdev_spec.to_string()));
+        }
+
         //increment for the next channel
         chan++;
     }
@@ -172,23 +183,23 @@ static boost::uint32_t calc_tx_mux(
  * |               Reserved                        |T|DUCs |R|DDCs |
  * +-----------------------------------------------+-+-----+-+-----+
  */
-static int num_ddcs(boost::uint32_t regval)
-{
+size_t usrp1_impl::get_num_ddcs(void){
+    boost::uint32_t regval = _iface->peek32(FR_RB_CAPS);
     return (regval >> 0) & 0x0007;
 }
 
-static int num_ducs(boost::uint32_t regval)
-{
+size_t usrp1_impl::get_num_ducs(void){
+    boost::uint32_t regval = _iface->peek32(FR_RB_CAPS);
     return (regval >> 4) & 0x0007;
 }
 
-static bool has_rx_halfband(boost::uint32_t regval)
-{
+bool usrp1_impl::has_rx_halfband(void){
+    boost::uint32_t regval = _iface->peek32(FR_RB_CAPS);
     return (regval >> 3) & 0x0001;
 }
 
-static bool has_tx_halfband(boost::uint32_t regval)
-{
+bool usrp1_impl::has_tx_halfband(void){
+    boost::uint32_t regval = _iface->peek32(FR_RB_CAPS);
     return (regval >> 7) & 0x0001;
 }
 
@@ -220,26 +231,25 @@ void usrp1_impl::mboard_init(void)
     // Set default for TX format to 16-bit I&Q
     _iface->poke32(FR_TX_FORMAT, 0x00000000);
 
-    // TODO TODO TODO TODO TODO TODO TODO TODO TODO TODO 
-    // 
-    // Do something useful with the capabilities register
-    //
-    boost::uint32_t regval = _iface->peek32(FR_RB_CAPS);
-    std::cout << "USRP1 Capabilities" << std::endl;
-    std::cout << "    number of duc's: " << num_ddcs(regval) << std::endl;
-    std::cout << "    number of ddc's: " << num_ducs(regval) << std::endl;
-    std::cout << "    rx halfband:     " << has_rx_halfband(regval) << std::endl;
-    std::cout << "    tx halfband:     " << has_tx_halfband(regval) << std::endl;
+    if (usrp1_mboard_verbose){
+        std::cout << "USRP1 Capabilities" << std::endl;
+        std::cout << "    number of duc's: " << get_num_ddcs() << std::endl;
+        std::cout << "    number of ddc's: " << get_num_ducs() << std::endl;
+        std::cout << "    rx halfband:     " << has_rx_halfband() << std::endl;
+        std::cout << "    tx halfband:     " << has_tx_halfband() << std::endl;
+    }
 }
 
 void usrp1_impl::issue_stream_cmd(const stream_cmd_t &stream_cmd)
 {
-    if (stream_cmd.stream_mode == stream_cmd_t::STREAM_MODE_START_CONTINUOUS) {
-        _iface->write_firmware_cmd(VRQ_FPGA_SET_RX_ENABLE, true, 0, 0, 0);
-    }
+    switch(stream_cmd.stream_mode){
+    case stream_cmd_t::STREAM_MODE_START_CONTINUOUS:
+        return _iface->write_firmware_cmd(VRQ_FPGA_SET_RX_ENABLE, true, 0, 0, 0);
+
+    case stream_cmd_t::STREAM_MODE_STOP_CONTINUOUS:
+        return _iface->write_firmware_cmd(VRQ_FPGA_SET_RX_ENABLE, false, 0, 0, 0);
 
-    if (stream_cmd.stream_mode == stream_cmd_t::STREAM_MODE_STOP_CONTINUOUS) {
-        _iface->write_firmware_cmd(VRQ_FPGA_SET_RX_ENABLE, false, 0, 0, 0);
+    default: throw std::runtime_error("unsupported stream command type for USRP1");
     }
 }
 
@@ -269,7 +279,7 @@ void usrp1_impl::mboard_get(const wax::obj &key_, wax::obj &val)
     //handle the get request conditioned on the key
     switch(key.as<mboard_prop_t>()){
     case MBOARD_PROP_NAME:
-        val = std::string("usrp1 mboard");
+        val = std::string("usrp1 mboard - " + (*_mboard_proxy)[std::string("serial")].as<std::string>());
         return;
 
     case MBOARD_PROP_OTHERS:
@@ -361,18 +371,26 @@ void usrp1_impl::mboard_set(const wax::obj &key, const wax::obj &val)
 
     case MBOARD_PROP_RX_SUBDEV_SPEC:
         _rx_subdev_spec = val.as<subdev_spec_t>();
+        if (_rx_subdev_spec.size() > this->get_num_ddcs()){
+            throw std::runtime_error(str(boost::format(
+                "USRP1 suports up to %u RX channels.\n"
+                "However, this RX subdev spec requires %u channels\n"
+            ) % this->get_num_ddcs() % _rx_subdev_spec.size()));
+        }
         verify_rx_subdev_spec(_rx_subdev_spec, _mboard_proxy->get_link());
-        //sanity check
-        UHD_ASSERT_THROW(_rx_subdev_spec.size() <= 2);
         //set the mux and set the number of rx channels
         _iface->poke32(FR_RX_MUX, calc_rx_mux(_rx_subdev_spec, _mboard_proxy->get_link()));
         return;
 
     case MBOARD_PROP_TX_SUBDEV_SPEC:
         _tx_subdev_spec = val.as<subdev_spec_t>();
+        if (_tx_subdev_spec.size() > this->get_num_ducs()){
+            throw std::runtime_error(str(boost::format(
+                "USRP1 suports up to %u TX channels.\n"
+                "However, this TX subdev spec requires %u channels\n"
+            ) % this->get_num_ducs() % _tx_subdev_spec.size()));
+        }
         verify_tx_subdev_spec(_tx_subdev_spec, _mboard_proxy->get_link());
-        //sanity check
-        UHD_ASSERT_THROW(_tx_subdev_spec.size() <= 2);
         //set the mux and set the number of tx channels
         _iface->poke32(FR_TX_MUX, calc_tx_mux(_tx_subdev_spec, _mboard_proxy->get_link()));
         return;
diff --git a/host/lib/usrp/usrp1/usrp1_impl.hpp b/host/lib/usrp/usrp1/usrp1_impl.hpp
index c2f693eeb..20ae3c02a 100644
--- a/host/lib/usrp/usrp1/usrp1_impl.hpp
+++ b/host/lib/usrp/usrp1/usrp1_impl.hpp
@@ -91,8 +91,16 @@ public:
                 recv_mode_t,
                 size_t timeout);
 
-    size_t get_max_send_samps_per_packet(void) const { return 0; }
-    size_t get_max_recv_samps_per_packet(void) const { return 0; }
+    static const size_t BYTES_PER_PACKET = 512*4; //under the transfer size
+
+    size_t get_max_send_samps_per_packet(void) const {
+        return BYTES_PER_PACKET/_tx_otw_type.get_sample_size()/_tx_subdev_spec.size();
+    }
+
+    size_t get_max_recv_samps_per_packet(void) const {
+        return BYTES_PER_PACKET/_rx_otw_type.get_sample_size()/_rx_subdev_spec.size();
+    }
+
     bool recv_async_msg(uhd::async_metadata_t &, size_t);
 
 private:
@@ -179,19 +187,27 @@ private:
     void rx_dsp_init(void);
     void rx_dsp_get(const wax::obj &, wax::obj &);
     void rx_dsp_set(const wax::obj &, const wax::obj &);
-    double _rx_dsp_freq; size_t _rx_dsp_decim;
+    uhd::dict<std::string, double> _rx_dsp_freqs;
+    size_t _rx_dsp_decim;
     wax_obj_proxy::sptr _rx_dsp_proxy;
 
     //tx dsp functions and settings
     void tx_dsp_init(void);
     void tx_dsp_get(const wax::obj &, wax::obj &);
     void tx_dsp_set(const wax::obj &, const wax::obj &);
-    double _tx_dsp_freq; size_t _tx_dsp_interp;
+    uhd::dict<std::string, double> _tx_dsp_freqs;
+    size_t _tx_dsp_interp;
     wax_obj_proxy::sptr _tx_dsp_proxy;
 
     //transports
     uhd::transport::usb_zero_copy::sptr _data_transport;
     usrp_ctrl::sptr _ctrl_transport;
+
+    //capabilities
+    size_t get_num_ducs(void);
+    size_t get_num_ddcs(void);
+    bool has_rx_halfband(void);
+    bool has_tx_halfband(void);
 };
 
 #endif /* INCLUDED_USRP1_IMPL_HPP */
diff --git a/host/lib/usrp/usrp2/dsp_impl.cpp b/host/lib/usrp/usrp2/dsp_impl.cpp
index 6422142ce..0c85e643f 100644
--- a/host/lib/usrp/usrp2/dsp_impl.cpp
+++ b/host/lib/usrp/usrp2/dsp_impl.cpp
@@ -56,7 +56,9 @@ void usrp2_mboard_impl::init_ddc_config(void){
 /***********************************************************************
  * DDC Properties
  **********************************************************************/
-void usrp2_mboard_impl::ddc_get(const wax::obj &key, wax::obj &val){
+void usrp2_mboard_impl::ddc_get(const wax::obj &key_, wax::obj &val){
+    named_prop_t key = named_prop_t::extract(key_);
+
     switch(key.as<dsp_prop_t>()){
     case DSP_PROP_NAME:
         val = std::string("usrp2 ddc0");
@@ -70,6 +72,10 @@ void usrp2_mboard_impl::ddc_get(const wax::obj &key, wax::obj &val){
         val = _ddc_freq;
         return;
 
+    case DSP_PROP_FREQ_SHIFT_NAMES:
+        val = prop_names_t(1, "");
+        return;
+
     case DSP_PROP_CODEC_RATE:
         val = get_master_clock_freq();
         return;
@@ -82,7 +88,9 @@ void usrp2_mboard_impl::ddc_get(const wax::obj &key, wax::obj &val){
     }
 }
 
-void usrp2_mboard_impl::ddc_set(const wax::obj &key, const wax::obj &val){
+void usrp2_mboard_impl::ddc_set(const wax::obj &key_, const wax::obj &val){
+    named_prop_t key = named_prop_t::extract(key_);
+
     switch(key.as<dsp_prop_t>()){
 
     case DSP_PROP_FREQ_SHIFT:{
@@ -131,7 +139,9 @@ void usrp2_mboard_impl::init_duc_config(void){
 /***********************************************************************
  * DUC Properties
  **********************************************************************/
-void usrp2_mboard_impl::duc_get(const wax::obj &key, wax::obj &val){
+void usrp2_mboard_impl::duc_get(const wax::obj &key_, wax::obj &val){
+    named_prop_t key = named_prop_t::extract(key_);
+
     switch(key.as<dsp_prop_t>()){
     case DSP_PROP_NAME:
         val = std::string("usrp2 duc0");
@@ -145,6 +155,10 @@ void usrp2_mboard_impl::duc_get(const wax::obj &key, wax::obj &val){
         val = _duc_freq;
         return;
 
+    case DSP_PROP_FREQ_SHIFT_NAMES:
+        val = prop_names_t(1, "");
+        return;
+
     case DSP_PROP_CODEC_RATE:
         val = get_master_clock_freq();
         return;
@@ -157,7 +171,9 @@ void usrp2_mboard_impl::duc_get(const wax::obj &key, wax::obj &val){
     }
 }
 
-void usrp2_mboard_impl::duc_set(const wax::obj &key, const wax::obj &val){
+void usrp2_mboard_impl::duc_set(const wax::obj &key_, const wax::obj &val){
+    named_prop_t key = named_prop_t::extract(key_);
+
     switch(key.as<dsp_prop_t>()){
 
     case DSP_PROP_FREQ_SHIFT:{
diff --git a/host/lib/usrp/usrp2/io_impl.cpp b/host/lib/usrp/usrp2/io_impl.cpp
index 4e883cf81..91a1b2344 100644
--- a/host/lib/usrp/usrp2/io_impl.cpp
+++ b/host/lib/usrp/usrp2/io_impl.cpp
@@ -189,7 +189,7 @@ bool usrp2_impl::recv_async_msg(
 /***********************************************************************
  * Send Data
  **********************************************************************/
-bool get_send_buffs(
+static bool get_send_buffs(
     const std::vector<udp_zero_copy::sptr> &trans,
     vrt_packet_handler::managed_send_buffs_t &buffs
 ){