Merge branch 'rework' of git@ettus.sourcerepo.com:ettus/uhd

22 files changed, 411 insertions, 351 deletions

diff --git a/firmware/microblaze/apps/txrx.c b/firmware/microblaze/apps/txrx.c
index 39a503091..69a04d771 100644
--- a/firmware/microblaze/apps/txrx.c
+++ b/firmware/microblaze/apps/txrx.c
@@ -385,7 +385,7 @@ void handle_udp_ctrl_packet(
             issue_stream_command(
                 (chain)? streaming_items_per_frame : num_samps, //nsamps
                 (ctrl_data_in->data.stream_cmd.now == 0)? false : true, //now
-                chain, //chain
+                (ctrl_data_in->data.stream_cmd.chain == 0)? chain : true, //chain
                 ctrl_data_in->data.stream_cmd.secs,
                 ctrl_data_in->data.stream_cmd.ticks,
                 false
@@ -398,7 +398,7 @@ void handle_udp_ctrl_packet(
                 issue_stream_command(
                     (chain)? streaming_items_per_frame : num_samps, //nsamps
                     true, //now
-                    chain, //chain
+                    (ctrl_data_in->data.stream_cmd.chain == 0)? chain : true, //chain
                     0, 0, //time does not matter
                     false
                 );
@@ -415,14 +415,38 @@ void handle_udp_ctrl_packet(
         if (ctrl_data_in->data.poke_args.addr < 0xC000){
             printf("error! tried to poke into 0x%x\n", ctrl_data_in->data.poke_args.addr);
         }
-        else{
-            *((uint32_t *) ctrl_data_in->data.poke_args.addr) = ctrl_data_in->data.poke_args.data;
+        else switch(ctrl_data_in->data.poke_args.num_bytes){
+        case sizeof(uint32_t):
+            *((uint32_t *) ctrl_data_in->data.poke_args.addr) = (uint32_t)ctrl_data_in->data.poke_args.data;
+            break;
+
+        case sizeof(uint16_t):
+            *((uint16_t *) ctrl_data_in->data.poke_args.addr) = (uint16_t)ctrl_data_in->data.poke_args.data;
+            break;
+
+        case sizeof(uint8_t):
+            *((uint8_t *) ctrl_data_in->data.poke_args.addr) = (uint8_t)ctrl_data_in->data.poke_args.data;
+            break;
+
         }
         ctrl_data_out.id = USRP2_CTRL_ID_OMG_POKED_REGISTER_SO_BAD_DUDE;
         break;
 
     case USRP2_CTRL_ID_PEEK_AT_THIS_REGISTER_FOR_ME_BRO:
-        ctrl_data_in->data.poke_args.data = *((uint32_t *) ctrl_data_in->data.poke_args.addr);
+        switch(ctrl_data_in->data.poke_args.num_bytes){
+        case sizeof(uint32_t):
+            ctrl_data_in->data.poke_args.data = *((uint32_t *) ctrl_data_in->data.poke_args.addr);
+            break;
+
+        case sizeof(uint16_t):
+            ctrl_data_in->data.poke_args.data = *((uint16_t *) ctrl_data_in->data.poke_args.addr);
+            break;
+
+        case sizeof(uint8_t):
+            ctrl_data_in->data.poke_args.data = *((uint8_t *) ctrl_data_in->data.poke_args.addr);
+            break;
+
+        }
         ctrl_data_out.id = USRP2_CTRL_ID_WOAH_I_DEFINITELY_PEEKED_IT_DUDE;
         break;
 
diff --git a/host/examples/rx_timed_samples.cpp b/host/examples/rx_timed_samples.cpp
index 58b5af9da..e971e9f6a 100644
--- a/host/examples/rx_timed_samples.cpp
+++ b/host/examples/rx_timed_samples.cpp
@@ -29,6 +29,7 @@ int UHD_SAFE_MAIN(int argc, char *argv[]){
     std::string transport_args;
     int seconds_in_future;
     size_t total_num_samps;
+    double rx_rate;
 
     //setup the program options
     po::options_description desc("Allowed options");
@@ -37,6 +38,7 @@ int UHD_SAFE_MAIN(int argc, char *argv[]){
         ("args", po::value<std::string>(&transport_args)->default_value(""), "simple uhd transport args")
         ("secs", po::value<int>(&seconds_in_future)->default_value(3), "number of seconds in the future to receive")
         ("nsamps", po::value<size_t>(&total_num_samps)->default_value(1000), "total number of samples to receive")
+        ("rxrate", po::value<double>(&rx_rate)->default_value(100e6/16), "rate of incoming samples")
     ;
     po::variables_map vm;
     po::store(po::parse_command_line(argc, argv, desc), vm);
@@ -57,9 +59,9 @@ int UHD_SAFE_MAIN(int argc, char *argv[]){
     std::cout << boost::format("Using Device: %s") % sdev->get_name() << std::endl;
 
     //set properties on the device
-    double rx_rate = sdev->get_rx_rates()[4]; //pick some rate
     std::cout << boost::format("Setting RX Rate: %f Msps...") % (rx_rate/1e6) << std::endl;
     sdev->set_rx_rate(rx_rate);
+    std::cout << boost::format("Actual RX Rate: %f Msps...") % (sdev->get_rx_rate()/1e6) << std::endl;
     std::cout << boost::format("Setting device timestamp to 0...") << std::endl;
     sdev->set_time_now(uhd::time_spec_t(0));
 
@@ -67,11 +69,10 @@ int UHD_SAFE_MAIN(int argc, char *argv[]){
     std::cout << std::endl;
     std::cout << boost::format("Begin streaming %u samples, %d seconds in the future...")
         % total_num_samps % seconds_in_future << std::endl;
-    uhd::stream_cmd_t stream_cmd;
+    uhd::stream_cmd_t stream_cmd(uhd::stream_cmd_t::STREAM_MODE_NUM_SAMPS_AND_DONE);
+    stream_cmd.num_samps = total_num_samps;
     stream_cmd.stream_now = false;
     stream_cmd.time_spec = uhd::time_spec_t(seconds_in_future);
-    stream_cmd.continuous = false;
-    stream_cmd.num_samps = total_num_samps;
     sdev->issue_stream_cmd(stream_cmd);
 
     //loop until total number of samples reached
diff --git a/host/include/uhd/device.hpp b/host/include/uhd/device.hpp
index 4d4196d98..bf7e0753d 100644
--- a/host/include/uhd/device.hpp
+++ b/host/include/uhd/device.hpp
@@ -112,6 +112,7 @@ public:
      * and will flag the metadata to show that this is a fragment.
      * The next call to receive, after the remainder becomes exahausted,
      * will perform an over-the-wire receive as usual.
+     * See the rx metadata fragment flags and offset fields for details.
      *
      * This is a blocking call and will not return until the number
      * of samples returned have been written into the buffer.
diff --git a/host/include/uhd/types/metadata.hpp b/host/include/uhd/types/metadata.hpp
index 6e93040d9..20f483bed 100644
--- a/host/include/uhd/types/metadata.hpp
+++ b/host/include/uhd/types/metadata.hpp
@@ -29,11 +29,45 @@ namespace uhd{
      * The receive routines will convert IF data headers into metadata.
      */
     struct UHD_API rx_metadata_t{
-        boost::uint32_t stream_id;
-        time_spec_t time_spec;
+        /*!
+         * Stream IDs may be used to identify source DSP units.
+         * --Not currently used in any known device implementation.--
+         */
         bool has_stream_id;
+        boost::uint32_t stream_id;
+
+        /*!
+         * Time specification:
+         * Set from timestamps on incoming data when provided.
+         */
         bool has_time_spec;
-        bool is_fragment;
+        time_spec_t time_spec;
+
+        /*!
+         * Fragmentation flag and offset:
+         * Similar to IPv4 fragmentation: http://en.wikipedia.org/wiki/IPv4#Fragmentation_and_reassembly
+         * More fragments is true when the input buffer has insufficient size to fit
+         * an entire received packet. More fragments will be false for the last fragment.
+         * The fragment offset is the sample number at the start of the receive buffer.
+         * For non-fragmented receives, the fragment offset should always be zero.
+         */
+        bool more_fragments;
+        size_t fragment_offset;
+
+        /*!
+         * Burst flags:
+         * Start of burst will be true for the first packet in the chain.
+         * End of burst will be true for the last packet in the chain.
+         * --Not currently used in any known device implementation.--
+         */
+        //bool start_of_burst;
+        //bool end_of_burst;
+
+        /*!
+         * Error conditions (TODO):
+         * Previous packets dropped?
+         * Timed-out on receive?
+         */
 
         //default constructor
         rx_metadata_t(void);
@@ -45,10 +79,26 @@ namespace uhd{
      * The send routines will convert the metadata to IF data headers.
      */
     struct UHD_API tx_metadata_t{
-        boost::uint32_t stream_id;
-        time_spec_t time_spec;
+        /*!
+         * Stream IDs may be used to identify destination DSP units.
+         * --Not currently used in any known device implementation.--
+         */
         bool has_stream_id;
+        boost::uint32_t stream_id;
+
+        /*!
+         * Time specification:
+         * Set has time spec to false to perform a send "now".
+         * Or, set to true, and fill in time spec for a send "at".
+         */
         bool has_time_spec;
+        time_spec_t time_spec;
+
+        /*!
+         * Burst flags:
+         * Set start of burst to true for the first packet in the chain.
+         * Set end of burst to true for the last packet in the chain.
+         */
         bool start_of_burst;
         bool end_of_burst;
 
diff --git a/host/include/uhd/types/stream_cmd.hpp b/host/include/uhd/types/stream_cmd.hpp
index 97a6b73ce..41708e2e2 100644
--- a/host/include/uhd/types/stream_cmd.hpp
+++ b/host/include/uhd/types/stream_cmd.hpp
@@ -31,24 +31,32 @@ namespace uhd{
      * Granular control over what the device streams to the host can be
      * achieved through submission of multiple (carefully-crafted) commands.
      *
-     * The stream_now parameter controls when the stream begins.
+     * The mode parameter controls how streaming is issued to the device:
+     *   - "Start continuous" tells the device to stream samples indefinitely.
+     *   - "Stop continuous" tells the device to end continuous streaming.
+     *   - "Num samps and done" tells the device to stream num samps and
+     *      to not expect a future stream command for contiguous samples.
+     *   - "Num samps and more" tells the device to stream num samps and
+     *      to expect a future stream command for contiguous samples.
+     *
+     * The stream now parameter controls when the stream begins.
      * When true, the device will begin streaming ASAP. When false,
      * the device will begin streaming at a time specified by time_spec.
-     *
-     * The continuous parameter controls the number of samples received.
-     * When true, the device continues streaming indefinitely. When false,
-     * the device will stream the number of samples specified by num_samps.
-     *
-     * Standard usage case:
-     * To start continuous streaming, set stream_now to true and continuous to true.
-     * To end continuous streaming, set stream_now to true and continuous to false.
      */
     struct UHD_API stream_cmd_t{
+
+        enum stream_mode_t {
+            STREAM_MODE_START_CONTINUOUS   = 'a',
+            STREAM_MODE_STOP_CONTINUOUS    = 'o',
+            STREAM_MODE_NUM_SAMPS_AND_DONE = 'd',
+            STREAM_MODE_NUM_SAMPS_AND_MORE = 'm'
+        } stream_mode;
+        size_t num_samps;
+
         bool stream_now;
         time_spec_t time_spec;
-        bool continuous;
-        size_t num_samps;
-        stream_cmd_t(void);
+
+        stream_cmd_t(const stream_mode_t &stream_mode);
     };
 
 } //namespace uhd
diff --git a/host/include/uhd/usrp/dsp_props.hpp b/host/include/uhd/usrp/dsp_props.hpp
index 60c0df942..75d8c0a60 100644
--- a/host/include/uhd/usrp/dsp_props.hpp
+++ b/host/include/uhd/usrp/dsp_props.hpp
@@ -24,15 +24,24 @@ namespace uhd{ namespace usrp{
 
     /*!
      * Possible device dsp properties:
-     *   A dsp can have a wide range of possible properties.
-     *   A ddc would have a properties "decim", "freq", "taps"...
-     *   Other properties could be gains, complex scalars, enables...
-     *   For this reason the only required properties of a dsp is a name
-     *   and a property to get list of other possible properties.
+     *   A dsp is a black box fpga component found between
+     *   the over-the-wire data and the codec pins.
+     *
+     *   The host rate can be modified to control resampling.
+     *   Resampling can take the form of decimation, interpolation,
+     *   or more complex fractional resampling techniques.
+     *   As usual, read back the host rate after setting it
+     *   to get the actual rate that was set (implementation dependent).
+     *
+     *   A dsp can also shift the digital stream in frequency.
+     *   Set the shift property and read it back to get actual shift.
      */
     enum dsp_prop_t{
-        DSP_PROP_NAME   = 'n', //ro, std::string
-        DSP_PROP_OTHERS = 'o'  //ro, prop_names_t
+        DSP_PROP_NAME         = 'n', //ro, std::string
+        DSP_PROP_OTHERS       = 'o', //ro, prop_names_t
+        DSP_PROP_FREQ_SHIFT   = 'f', //rw, double Hz
+        DSP_PROP_CODEC_RATE   = 'c', //ro, double Sps
+        DSP_PROP_HOST_RATE    = 'h'  //rw, double Sps
     };
 
 }} //namespace
diff --git a/host/include/uhd/usrp/mboard_props.hpp b/host/include/uhd/usrp/mboard_props.hpp
index cfc1f412e..55c11b822 100644
--- a/host/include/uhd/usrp/mboard_props.hpp
+++ b/host/include/uhd/usrp/mboard_props.hpp
@@ -42,7 +42,8 @@ namespace uhd{ namespace usrp{
         MBOARD_PROP_TX_DBOARD_NAMES = 'V', //ro, prop_names_t
         MBOARD_PROP_CLOCK_CONFIG    = 'C', //rw, clock_config_t
         MBOARD_PROP_TIME_NOW        = 't', //wo, time_spec_t
-        MBOARD_PROP_TIME_NEXT_PPS   = 'T'  //wo, time_spec_t
+        MBOARD_PROP_TIME_NEXT_PPS   = 'T', //wo, time_spec_t
+        MBOARD_PROP_STREAM_CMD      = 's'  //wo, stream_cmd_t
     };
 
 }} //namespace
diff --git a/host/include/uhd/usrp/simple_usrp.hpp b/host/include/uhd/usrp/simple_usrp.hpp
index 2d6ad2a0f..6f74a406b 100644
--- a/host/include/uhd/usrp/simple_usrp.hpp
+++ b/host/include/uhd/usrp/simple_usrp.hpp
@@ -59,7 +59,6 @@ public:
      ******************************************************************/
     virtual void set_rx_rate(double rate) = 0;
     virtual double get_rx_rate(void) = 0;
-    virtual std::vector<double> get_rx_rates(void) = 0;
 
     virtual tune_result_t set_rx_freq(double freq) = 0;
     virtual freq_range_t get_rx_freq_range(void) = 0;
@@ -77,7 +76,6 @@ public:
      ******************************************************************/
     virtual void set_tx_rate(double rate) = 0;
     virtual double get_tx_rate(void) = 0;
-    virtual std::vector<double> get_tx_rates(void) = 0;
 
     virtual tune_result_t set_tx_freq(double freq) = 0;
     virtual freq_range_t get_tx_freq_range(void) = 0;
diff --git a/host/include/uhd/usrp/subdev_props.hpp b/host/include/uhd/usrp/subdev_props.hpp
index 92d18340b..d35793c6b 100644
--- a/host/include/uhd/usrp/subdev_props.hpp
+++ b/host/include/uhd/usrp/subdev_props.hpp
@@ -39,7 +39,7 @@ namespace uhd{ namespace usrp{
         SUBDEV_PROP_QUADRATURE        = 'q', //ro, bool
         SUBDEV_PROP_IQ_SWAPPED        = 'i', //ro, bool
         SUBDEV_PROP_SPECTRUM_INVERTED = 's', //ro, bool
-        SUBDEV_PROP_LO_INTERFERES     = 'l'  //ro, bool
+        SUBDEV_PROP_USE_LO_OFFSET     = 'l'  //ro, bool
         //SUBDEV_PROP_RSSI,              //ro, float //----> not on all boards, use named prop
         //SUBDEV_PROP_BANDWIDTH          //rw, double //----> not on all boards, use named prop
     };
diff --git a/host/lib/types.cpp b/host/lib/types.cpp
index bf9f8b895..d87238161 100644
--- a/host/lib/types.cpp
+++ b/host/lib/types.cpp
@@ -71,9 +71,9 @@ clock_config_t::clock_config_t(void){
 /***********************************************************************
  * stream command
  **********************************************************************/
-stream_cmd_t::stream_cmd_t(void){
+stream_cmd_t::stream_cmd_t(const stream_mode_t &stream_mode_){
+    stream_mode = stream_mode_;
     stream_now = true;
-    continuous = false;
     num_samps = 0;
 }
 
@@ -85,7 +85,8 @@ rx_metadata_t::rx_metadata_t(void){
     has_stream_id = false;
     time_spec = time_spec_t();
     has_time_spec = false;
-    is_fragment = false;
+    more_fragments = false;
+    fragment_offset = 0;
 }
 
 tx_metadata_t::tx_metadata_t(void){
diff --git a/host/lib/usrp/dboard/db_basic_and_lf.cpp b/host/lib/usrp/dboard/db_basic_and_lf.cpp
index be4e646ed..930646f76 100644
--- a/host/lib/usrp/dboard/db_basic_and_lf.cpp
+++ b/host/lib/usrp/dboard/db_basic_and_lf.cpp
@@ -150,7 +150,7 @@ void basic_rx::rx_get(const wax::obj &key_, wax::obj &val){
 
     case SUBDEV_PROP_IQ_SWAPPED:
     case SUBDEV_PROP_SPECTRUM_INVERTED:
-    case SUBDEV_PROP_LO_INTERFERES:
+    case SUBDEV_PROP_USE_LO_OFFSET:
         val = false;
         return;
     }
@@ -186,7 +186,7 @@ void basic_rx::rx_set(const wax::obj &key_, const wax::obj &val){
     case SUBDEV_PROP_QUADRATURE:
     case SUBDEV_PROP_IQ_SWAPPED:
     case SUBDEV_PROP_SPECTRUM_INVERTED:
-    case SUBDEV_PROP_LO_INTERFERES:
+    case SUBDEV_PROP_USE_LO_OFFSET:
         throw std::runtime_error(str(boost::format(
             "Error: trying to set read-only property on %s subdev"
         ) % dboard_id::to_string(get_rx_id())));
@@ -258,7 +258,7 @@ void basic_tx::tx_get(const wax::obj &key_, wax::obj &val){
 
     case SUBDEV_PROP_IQ_SWAPPED:
     case SUBDEV_PROP_SPECTRUM_INVERTED:
-    case SUBDEV_PROP_LO_INTERFERES:
+    case SUBDEV_PROP_USE_LO_OFFSET:
         val = false;
         return;
     }
@@ -294,7 +294,7 @@ void basic_tx::tx_set(const wax::obj &key_, const wax::obj &val){
     case SUBDEV_PROP_QUADRATURE:
     case SUBDEV_PROP_IQ_SWAPPED:
     case SUBDEV_PROP_SPECTRUM_INVERTED:
-    case SUBDEV_PROP_LO_INTERFERES:
+    case SUBDEV_PROP_USE_LO_OFFSET:
         throw std::runtime_error(str(boost::format(
             "Error: trying to set read-only property on %s subdev"
         ) % dboard_id::to_string(get_tx_id())));
diff --git a/host/lib/usrp/simple_usrp.cpp b/host/lib/usrp/simple_usrp.cpp
index a0551a630..fb3cc8eec 100644
--- a/host/lib/usrp/simple_usrp.cpp
+++ b/host/lib/usrp/simple_usrp.cpp
@@ -22,6 +22,7 @@
 #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>
@@ -30,17 +31,6 @@ using namespace uhd;
 using namespace uhd::usrp;
 
 /***********************************************************************
- * Helper Functions
- **********************************************************************/
-static std::vector<double> get_xx_rates(wax::obj decerps, wax::obj rate){
-    std::vector<double> rates;
-    BOOST_FOREACH(size_t decerp, decerps.as<std::vector<size_t> >()){
-        rates.push_back(rate.as<double>()/decerp);
-    }
-    return rates;
-}
-
-/***********************************************************************
  * Simple Device Implementation
  **********************************************************************/
 class simple_usrp_impl : public simple_usrp{
@@ -48,8 +38,8 @@ public:
     simple_usrp_impl(const device_addr_t &addr){
         _dev = device::make(addr);
         _mboard = (*_dev)[DEVICE_PROP_MBOARD];
-        _rx_ddc = _mboard[named_prop_t(MBOARD_PROP_RX_DSP, "ddc0")];
-        _tx_duc = _mboard[named_prop_t(MBOARD_PROP_TX_DSP, "duc0")];
+        _rx_dsp = _mboard[MBOARD_PROP_RX_DSP];
+        _tx_dsp = _mboard[MBOARD_PROP_TX_DSP];
 
         //extract rx subdevice
         wax::obj rx_dboard = _mboard[MBOARD_PROP_RX_DBOARD];
@@ -86,7 +76,7 @@ public:
     }
 
     void issue_stream_cmd(const stream_cmd_t &stream_cmd){
-        _rx_ddc[std::string("stream_cmd")] = stream_cmd;
+        _mboard[MBOARD_PROP_STREAM_CMD] = stream_cmd;
     }
 
     void set_clock_config(const clock_config_t &clock_config){
@@ -101,21 +91,15 @@ public:
      * RX methods
      ******************************************************************/
     void set_rx_rate(double rate){
-        double samp_rate = _rx_ddc[std::string("if_rate")].as<double>();
-        assert_has(get_rx_rates(), rate, "simple device rx rate");
-        _rx_ddc[std::string("decim")] = size_t(samp_rate/rate);
+        _rx_dsp[DSP_PROP_HOST_RATE] = rate;
     }
 
     double get_rx_rate(void){
-        return _rx_ddc[std::string("bb_rate")].as<double>();
-    }
-
-    std::vector<double> get_rx_rates(void){
-        return get_xx_rates(_rx_ddc[std::string("decims")], _rx_ddc[std::string("if_rate")]);
+        return _rx_dsp[DSP_PROP_HOST_RATE].as<double>();
     }
 
     tune_result_t set_rx_freq(double target_freq){
-        return tune_rx_subdev_and_ddc(_rx_subdev, _rx_ddc, target_freq);
+        return tune_rx_subdev_and_ddc(_rx_subdev, _rx_dsp, target_freq);
     }
 
     freq_range_t get_rx_freq_range(void){
@@ -150,21 +134,15 @@ public:
      * TX methods
      ******************************************************************/
     void set_tx_rate(double rate){
-        double samp_rate = _tx_duc[std::string("if_rate")].as<double>();
-        assert_has(get_tx_rates(), rate, "simple device tx rate");
-        _tx_duc[std::string("interp")] = size_t(samp_rate/rate);
+        _tx_dsp[DSP_PROP_HOST_RATE] = rate;
     }
 
     double get_tx_rate(void){
-        return _tx_duc[std::string("bb_rate")].as<double>();
-    }
-
-    std::vector<double> get_tx_rates(void){
-        return get_xx_rates(_tx_duc[std::string("interps")], _tx_duc[std::string("if_rate")]);
+        return _tx_dsp[DSP_PROP_HOST_RATE].as<double>();
     }
 
     tune_result_t set_tx_freq(double target_freq){
-        return tune_tx_subdev_and_duc(_tx_subdev, _tx_duc, target_freq);
+        return tune_tx_subdev_and_duc(_tx_subdev, _tx_dsp, target_freq);
     }
 
     freq_range_t get_tx_freq_range(void){
@@ -198,8 +176,8 @@ public:
 private:
     device::sptr _dev;
     wax::obj _mboard;
-    wax::obj _rx_ddc;
-    wax::obj _tx_duc;
+    wax::obj _rx_dsp;
+    wax::obj _tx_dsp;
     wax::obj _rx_subdev;
     wax::obj _tx_subdev;
 };
diff --git a/host/lib/usrp/tune_helper.cpp b/host/lib/usrp/tune_helper.cpp
index 79a6aff7b..2fb15064c 100644
--- a/host/lib/usrp/tune_helper.cpp
+++ b/host/lib/usrp/tune_helper.cpp
@@ -18,6 +18,7 @@
 #include <uhd/usrp/tune_helper.hpp>
 #include <uhd/utils/algorithm.hpp>
 #include <uhd/usrp/subdev_props.hpp>
+#include <uhd/usrp/dsp_props.hpp>
 #include <cmath>
 
 using namespace uhd;
@@ -34,8 +35,8 @@ static tune_result_t tune_xx_subdev_and_dxc(
     wax::obj subdev_freq_proxy = subdev[SUBDEV_PROP_FREQ];
     bool subdev_quadrature = subdev[SUBDEV_PROP_QUADRATURE].as<bool>();
     bool subdev_spectrum_inverted = subdev[SUBDEV_PROP_SPECTRUM_INVERTED].as<bool>();
-    wax::obj dxc_freq_proxy = dxc[std::string("freq")];
-    double dxc_sample_rate = dxc[std::string("if_rate")].as<double>();
+    wax::obj dxc_freq_proxy = dxc[DSP_PROP_FREQ_SHIFT];
+    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
     double target_inter_freq = target_freq + lo_offset;
@@ -96,8 +97,8 @@ tune_result_t uhd::usrp::tune_rx_subdev_and_ddc(
 ){
     double lo_offset = 0.0;
     //if the local oscillator will be in the passband, use an offset
-    if (subdev[SUBDEV_PROP_LO_INTERFERES].as<bool>()){
-        lo_offset = 2.0*ddc[std::string("bb_rate")].as<double>();
+    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_ddc(subdev, ddc, target_freq, lo_offset);
 }
@@ -119,8 +120,8 @@ tune_result_t uhd::usrp::tune_tx_subdev_and_duc(
 ){
     double lo_offset = 0.0;
     //if the local oscillator will be in the passband, use an offset
-    if (subdev[SUBDEV_PROP_LO_INTERFERES].as<bool>()){
-        lo_offset = 2.0*duc[std::string("bb_rate")].as<double>();
+    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_duc(subdev, duc, target_freq, lo_offset);
 }
diff --git a/host/lib/usrp/usrp2/dboard_impl.cpp b/host/lib/usrp/usrp2/dboard_impl.cpp
index 30883cd50..d1515f2d5 100644
--- a/host/lib/usrp/usrp2/dboard_impl.cpp
+++ b/host/lib/usrp/usrp2/dboard_impl.cpp
@@ -49,11 +49,11 @@ void usrp2_impl::dboard_init(void){
     );
 
     //load dboards
-    _rx_dboards[""] = wax_obj_proxy::make(
+    _rx_dboard_proxy = wax_obj_proxy::make(
         boost::bind(&usrp2_impl::rx_dboard_get, this, _1, _2),
         boost::bind(&usrp2_impl::rx_dboard_set, this, _1, _2)
     );
-    _tx_dboards[""] = wax_obj_proxy::make(
+    _tx_dboard_proxy = wax_obj_proxy::make(
         boost::bind(&usrp2_impl::tx_dboard_get, this, _1, _2),
         boost::bind(&usrp2_impl::tx_dboard_set, this, _1, _2)
     );
@@ -81,7 +81,7 @@ void usrp2_impl::update_rx_mux_config(void){
         rx_mux = (((rx_mux >> 0) & 0x3) << 2) | (((rx_mux >> 2) & 0x3) << 0);
     }
 
-    this->poke(FR_DSP_RX_MUX, rx_mux);
+    this->poke32(FR_DSP_RX_MUX, rx_mux);
 }
 
 void usrp2_impl::update_tx_mux_config(void){
@@ -94,7 +94,7 @@ void usrp2_impl::update_tx_mux_config(void){
         tx_mux = (((tx_mux >> 0) & 0x1) << 1) | (((tx_mux >> 1) & 0x1) << 0);
     }
 
-    this->poke(FR_DSP_TX_MUX, tx_mux);
+    this->poke32(FR_DSP_TX_MUX, tx_mux);
 }
 
 /***********************************************************************
diff --git a/host/lib/usrp/usrp2/dboard_interface.cpp b/host/lib/usrp/usrp2/dboard_interface.cpp
index 2e79381c5..d7c18983a 100644
--- a/host/lib/usrp/usrp2/dboard_interface.cpp
+++ b/host/lib/usrp/usrp2/dboard_interface.cpp
@@ -48,17 +48,6 @@ private:
     );
 
     usrp2_impl *_impl;
-
-    //shadows
-    boost::uint32_t _ddr_shadow;
-    uhd::dict<atr_reg_t, boost::uint32_t> _atr_reg_shadows;
-
-    //utilities
-    static int bank_to_shift(gpio_bank_t bank){
-        static const uhd::dict<gpio_bank_t, int> _bank_to_shift = \
-        boost::assign::map_list_of(GPIO_BANK_RX, 0)(GPIO_BANK_TX, 16);
-        return _bank_to_shift[bank];
-    }
 };
 
 /***********************************************************************
@@ -73,7 +62,14 @@ dboard_interface::sptr make_usrp2_dboard_interface(usrp2_impl *impl){
  **********************************************************************/
 usrp2_dboard_interface::usrp2_dboard_interface(usrp2_impl *impl){
     _impl = impl;
-    _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);
+    }
+    _impl->poke32(FR_GPIO_TX_SEL, new_sels);
+    _impl->poke32(FR_GPIO_RX_SEL, new_sels);
 }
 
 usrp2_dboard_interface::~usrp2_dboard_interface(void){
@@ -95,42 +91,40 @@ double usrp2_dboard_interface::get_tx_clock_rate(void){
  * GPIO
  **********************************************************************/
 void usrp2_dboard_interface::set_gpio_ddr(gpio_bank_t bank, boost::uint16_t value){
-    //calculate the new 32 bit ddr value
-    int shift = bank_to_shift(bank);
-    boost::uint32_t new_ddr_val =
-        (_ddr_shadow & ~(boost::uint32_t(0xffff) << shift)) //zero out new bits
-        | (boost::uint32_t(value) << shift); //or'ed in the new bits
-
-    //poke in the value and shadow
-    _impl->poke(FR_GPIO_DDR, new_ddr_val);
-    _ddr_shadow = new_ddr_val;
+    static const uhd::dict<gpio_bank_t, boost::uint32_t> bank_to_addr = boost::assign::map_list_of
+        (GPIO_BANK_RX, FR_GPIO_RX_DDR)
+        (GPIO_BANK_TX, FR_GPIO_TX_DDR)
+    ;
+    _impl->poke16(bank_to_addr[bank], value);
 }
 
 boost::uint16_t usrp2_dboard_interface::read_gpio(gpio_bank_t bank){
-    boost::uint32_t data = _impl->peek(FR_GPIO_IO);
-    return boost::uint16_t(data >> bank_to_shift(bank));
+    static const uhd::dict<gpio_bank_t, boost::uint32_t> bank_to_addr = boost::assign::map_list_of
+        (GPIO_BANK_RX, FR_GPIO_RX_IO)
+        (GPIO_BANK_TX, FR_GPIO_TX_IO)
+    ;
+    return _impl->peek16(bank_to_addr[bank]);
 }
 
-void usrp2_dboard_interface::set_atr_reg(gpio_bank_t bank, atr_reg_t reg, boost::uint16_t value){
-    //map the atr reg to an offset in register space
-    static const uhd::dict<atr_reg_t, int> reg_to_addr = boost::assign::map_list_of
-        (ATR_REG_IDLE, FR_ATR_IDLE) (ATR_REG_TX_ONLY, FR_ATR_TX)
-        (ATR_REG_RX_ONLY, FR_ATR_RX) (ATR_REG_FULL_DUPLEX, FR_ATR_FULL)
+void usrp2_dboard_interface::set_atr_reg(gpio_bank_t bank, atr_reg_t atr, boost::uint16_t value){
+    //define mapping of bank to atr regs to register address
+    static const uhd::dict<
+        gpio_bank_t, uhd::dict<atr_reg_t, boost::uint32_t>
+    > bank_to_atr_to_addr = boost::assign::map_list_of
+        (GPIO_BANK_RX, boost::assign::map_list_of
+            (ATR_REG_IDLE,        FR_ATR_IDLE_RXSIDE)
+            (ATR_REG_TX_ONLY,     FR_ATR_INTX_RXSIDE)
+            (ATR_REG_RX_ONLY,     FR_ATR_INRX_RXSIDE)
+            (ATR_REG_FULL_DUPLEX, FR_ATR_FULL_RXSIDE)
+        )
+        (GPIO_BANK_TX, boost::assign::map_list_of
+            (ATR_REG_IDLE,        FR_ATR_IDLE_TXSIDE)
+            (ATR_REG_TX_ONLY,     FR_ATR_INTX_TXSIDE)
+            (ATR_REG_RX_ONLY,     FR_ATR_INRX_TXSIDE)
+            (ATR_REG_FULL_DUPLEX, FR_ATR_FULL_TXSIDE)
+        )
     ;
-    ASSERT_THROW(reg_to_addr.has_key(reg));
-
-    //ensure a value exists in the shadow
-    if (not _atr_reg_shadows.has_key(reg)) _atr_reg_shadows[reg] = 0;
-
-    //calculate the new 32 bit atr value
-    int shift = bank_to_shift(bank);
-    boost::uint32_t new_atr_val =
-        (_atr_reg_shadows[reg] & ~(boost::uint32_t(0xffff) << shift)) //zero out new bits
-        | (boost::uint32_t(value) << shift); //or'ed in the new bits
-
-    //poke in the value and shadow
-    _impl->poke(reg_to_addr[reg], new_atr_val);
-    _atr_reg_shadows[reg] = new_atr_val;
+    _impl->poke16(bank_to_atr_to_addr[bank][atr], value);
 }
 
 /***********************************************************************
diff --git a/host/lib/usrp/usrp2/dsp_impl.cpp b/host/lib/usrp/usrp2/dsp_impl.cpp
index d70248682..92b55d029 100644
--- a/host/lib/usrp/usrp2/dsp_impl.cpp
+++ b/host/lib/usrp/usrp2/dsp_impl.cpp
@@ -54,9 +54,19 @@ static boost::uint32_t calculate_iq_scale_word(boost::int16_t i, boost::int16_t
     return (boost::uint16_t(i) << 16) | (boost::uint16_t(q) << 0);
 }
 
+template <class rate_t> static rate_t
+pick_closest_rate(double exact_rate, const std::vector<rate_t> &rates){
+    rate_t closest_match = rates.at(0);
+    BOOST_FOREACH(rate_t possible_rate, rates){
+        if(std::abs(exact_rate - possible_rate) < std::abs(exact_rate - closest_match))
+            closest_match = possible_rate;
+    }
+    return closest_match;
+}
+
 void usrp2_impl::init_ddc_config(void){
     //create the ddc in the rx dsp dict
-    _rx_dsps["ddc0"] = wax_obj_proxy::make(
+    _rx_dsp_proxy = wax_obj_proxy::make(
         boost::bind(&usrp2_impl::ddc_get, this, _1, _2),
         boost::bind(&usrp2_impl::ddc_set, this, _1, _2)
     );
@@ -67,124 +77,71 @@ void usrp2_impl::init_ddc_config(void){
     update_ddc_config();
 
     //initial command that kills streaming (in case if was left on)
-    stream_cmd_t stream_cmd_off;
-    stream_cmd_off.stream_now = true;
-    stream_cmd_off.continuous = false;
-    stream_cmd_off.num_samps = 0;
-    issue_ddc_stream_cmd(stream_cmd_off);
+    issue_ddc_stream_cmd(stream_cmd_t::STREAM_MODE_STOP_CONTINUOUS);
 }
 
 void usrp2_impl::update_ddc_config(void){
     //set the decimation
-    this->poke(FR_DSP_RX_DECIM_RATE, _ddc_decim);
+    this->poke32(FR_DSP_RX_DECIM_RATE, _ddc_decim);
 
     //set the scaling
     static const boost::int16_t default_rx_scale_iq = 1024;
-    this->poke(FR_DSP_RX_SCALE_IQ,
+    this->poke32(FR_DSP_RX_SCALE_IQ,
         calculate_iq_scale_word(default_rx_scale_iq, default_rx_scale_iq)
     );
 }
 
-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.continuous = (stream_cmd.continuous)? 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.ticks);
-    out_data.data.stream_cmd.num_samps = htonl(stream_cmd.num_samps);
-
-    //send and recv
-    usrp2_ctrl_data_t in_data = ctrl_send_and_recv(out_data);
-    ASSERT_THROW(htonl(in_data.id) == USRP2_CTRL_ID_GOT_THAT_STREAM_COMMAND_DUDE);
-}
-
 /***********************************************************************
  * DDC Properties
  **********************************************************************/
 void usrp2_impl::ddc_get(const wax::obj &key, wax::obj &val){
-    //handle the case where the key is an expected dsp property
-    if (key.type() == typeid(dsp_prop_t)){
-        switch(key.as<dsp_prop_t>()){
-        case DSP_PROP_NAME:
-            val = std::string("usrp2 ddc0");
-            return;
-
-        case DSP_PROP_OTHERS:{
-                prop_names_t others = boost::assign::list_of
-                    ("if_rate")
-                    ("bb_rate")
-                    ("decim")
-                    ("decims")
-                    ("freq")
-                    ("stream_cmd")
-                ;
-                val = others;
-            }
-            return;
-        }
-    }
-
-    //handle string-based properties specific to this dsp
-    std::string key_name = key.as<std::string>();
-    if (key_name == "if_rate"){
-        val = get_master_clock_freq();
+    switch(key.as<dsp_prop_t>()){
+    case DSP_PROP_NAME:
+        val = std::string("usrp2 ddc0");
         return;
-    }
-    else if (key_name == "bb_rate"){
-        val = get_master_clock_freq()/_ddc_decim;
+
+    case DSP_PROP_OTHERS:
+        val = prop_names_t(); //empty
         return;
-    }
-    else if (key_name == "decim"){
-        val = _ddc_decim;
+
+    case DSP_PROP_FREQ_SHIFT:
+        val = _ddc_freq;
         return;
-    }
-    else if (key_name == "decims"){
-        val = _allowed_decim_and_interp_rates;
+
+    case DSP_PROP_CODEC_RATE:
+        val = get_master_clock_freq();
         return;
-    }
-    else if (key_name == "freq"){
-        val = _ddc_freq;
+
+    case DSP_PROP_HOST_RATE:
+        val = get_master_clock_freq()/_ddc_decim;
         return;
     }
-
-    throw std::invalid_argument(str(
-        boost::format("error getting: unknown key with name %s") % key_name
-    ));
 }
 
 void usrp2_impl::ddc_set(const wax::obj &key, const wax::obj &val){
-    //handle string-based properties specific to this dsp
-    std::string key_name = key.as<std::string>();
-    if (key_name == "decim"){
-        size_t new_decim = val.as<size_t>();
-        assert_has(
-            _allowed_decim_and_interp_rates,
-            new_decim, "usrp2 decimation"
-        );
-        _ddc_decim = new_decim; //shadow
-        update_ddc_config();
-        return;
-    }
-    else if (key_name == "freq"){
-        double new_freq = val.as<double>();
-        ASSERT_THROW(new_freq <= get_master_clock_freq()/2.0);
-        ASSERT_THROW(new_freq >= -get_master_clock_freq()/2.0);
-        _ddc_freq = new_freq; //shadow
-        this->poke(FR_DSP_RX_FREQ,
-            calculate_freq_word_and_update_actual_freq(_ddc_freq, get_master_clock_freq())
-        );
+    switch(key.as<dsp_prop_t>()){
+
+    case DSP_PROP_FREQ_SHIFT:{
+            double new_freq = val.as<double>();
+            ASSERT_THROW(new_freq <= get_master_clock_freq()/2.0);
+            ASSERT_THROW(new_freq >= -get_master_clock_freq()/2.0);
+            _ddc_freq = new_freq; //shadow
+            this->poke32(FR_DSP_RX_FREQ,
+                calculate_freq_word_and_update_actual_freq(_ddc_freq, get_master_clock_freq())
+            );
+        }
         return;
-    }
-    else if (key_name == "stream_cmd"){
-        issue_ddc_stream_cmd(val.as<stream_cmd_t>());
+
+    case DSP_PROP_HOST_RATE:{
+            double extact_rate = get_master_clock_freq()/val.as<double>();
+            _ddc_decim = pick_closest_rate(extact_rate, _allowed_decim_and_interp_rates);
+            update_ddc_config();
+        }
         return;
-    }
 
-    throw std::invalid_argument(str(
-        boost::format("error setting: unknown key with name %s") % key_name
-    ));
+    default:
+        throw std::runtime_error("Error: trying to set read-only property on usrp2 ddc0");
+    }
 }
 
 /***********************************************************************
@@ -192,7 +149,7 @@ void usrp2_impl::ddc_set(const wax::obj &key, const wax::obj &val){
  **********************************************************************/
 void usrp2_impl::init_duc_config(void){
     //create the duc in the tx dsp dict
-    _tx_dsps["duc0"] = wax_obj_proxy::make(
+    _tx_dsp_proxy = wax_obj_proxy::make(
         boost::bind(&usrp2_impl::duc_get, this, _1, _2),
         boost::bind(&usrp2_impl::duc_set, this, _1, _2)
     );
@@ -213,90 +170,61 @@ void usrp2_impl::update_duc_config(void){
     boost::int16_t scale = rint((4096*std::pow(2, ceil(log2(interp_cubed))))/(1.65*interp_cubed));
 
     //set the interpolation
-    this->poke(FR_DSP_TX_INTERP_RATE, _ddc_decim);
+    this->poke32(FR_DSP_TX_INTERP_RATE, _ddc_decim);
 
     //set the scaling
-    this->poke(FR_DSP_TX_SCALE_IQ, calculate_iq_scale_word(scale, scale));
+    this->poke32(FR_DSP_TX_SCALE_IQ, calculate_iq_scale_word(scale, scale));
 }
 
 /***********************************************************************
  * DUC Properties
  **********************************************************************/
 void usrp2_impl::duc_get(const wax::obj &key, wax::obj &val){
-    //handle the case where the key is an expected dsp property
-    if (key.type() == typeid(dsp_prop_t)){
-        switch(key.as<dsp_prop_t>()){
-        case DSP_PROP_NAME:
-            val = std::string("usrp2 duc0");
-            return;
-
-        case DSP_PROP_OTHERS:{
-                prop_names_t others = boost::assign::list_of
-                    ("if_rate")
-                    ("bb_rate")
-                    ("interp")
-                    ("interps")
-                    ("freq")
-                ;
-                val = others;
-            }
-            return;
-        }
-    }
-
-    //handle string-based properties specific to this dsp
-    std::string key_name = key.as<std::string>();
-    if (key_name == "if_rate"){
-        val = get_master_clock_freq();
+    switch(key.as<dsp_prop_t>()){
+    case DSP_PROP_NAME:
+        val = std::string("usrp2 duc0");
         return;
-    }
-    else if (key_name == "bb_rate"){
-        val = get_master_clock_freq()/_duc_interp;
+
+    case DSP_PROP_OTHERS:
+        val = prop_names_t(); //empty
         return;
-    }
-    else if (key_name == "interp"){
-        val = _duc_interp;
+
+    case DSP_PROP_FREQ_SHIFT:
+        val = _duc_freq;
         return;
-    }
-    else if (key_name == "interps"){
-        val = _allowed_decim_and_interp_rates;
+
+    case DSP_PROP_CODEC_RATE:
+        val = get_master_clock_freq();
         return;
-    }
-    else if (key_name == "freq"){
-        val = _duc_freq;
+
+    case DSP_PROP_HOST_RATE:
+        val = get_master_clock_freq()/_duc_interp;
         return;
     }
-
-    throw std::invalid_argument(str(
-        boost::format("error getting: unknown key with name %s") % key_name
-    ));
 }
 
 void usrp2_impl::duc_set(const wax::obj &key, const wax::obj &val){
-    //handle string-based properties specific to this dsp
-    std::string key_name = key.as<std::string>();
-    if (key_name == "interp"){
-        size_t new_interp = val.as<size_t>();
-        assert_has(
-            _allowed_decim_and_interp_rates,
-            new_interp, "usrp2 interpolation"
-        );
-        _duc_interp = new_interp; //shadow
-        update_duc_config();
+    switch(key.as<dsp_prop_t>()){
+
+    case DSP_PROP_FREQ_SHIFT:{
+            double new_freq = val.as<double>();
+            ASSERT_THROW(new_freq <= get_master_clock_freq()/2.0);
+            ASSERT_THROW(new_freq >= -get_master_clock_freq()/2.0);
+            _duc_freq = new_freq; //shadow
+            this->poke32(FR_DSP_TX_FREQ,
+                calculate_freq_word_and_update_actual_freq(_duc_freq, get_master_clock_freq())
+            );
+        }
         return;
-    }
-    else if (key_name == "freq"){
-        double new_freq = val.as<double>();
-        ASSERT_THROW(new_freq <= get_master_clock_freq()/2.0);
-        ASSERT_THROW(new_freq >= -get_master_clock_freq()/2.0);
-        _duc_freq = new_freq; //shadow
-        this->poke(FR_DSP_TX_FREQ,
-            calculate_freq_word_and_update_actual_freq(_duc_freq, get_master_clock_freq())
-        );
+
+    case DSP_PROP_HOST_RATE:{
+            double extact_rate = get_master_clock_freq()/val.as<double>();
+            _duc_interp = pick_closest_rate(extact_rate, _allowed_decim_and_interp_rates);
+            update_duc_config();
+        }
         return;
-    }
 
-    throw std::invalid_argument(str(
-        boost::format("error setting: unknown key with name %s") % key_name
-    ));
+    default:
+        throw std::runtime_error("Error: trying to set read-only property on usrp2 duc0");
+    }
 }
diff --git a/host/lib/usrp/usrp2/fw_common.h b/host/lib/usrp/usrp2/fw_common.h
index c168614ee..019f3b931 100644
--- a/host/lib/usrp/usrp2/fw_common.h
+++ b/host/lib/usrp/usrp2/fw_common.h
@@ -129,7 +129,8 @@ typedef struct{
         struct {
             _SINS_ uint8_t now; //stream now?
             _SINS_ uint8_t continuous; //auto-reload commmands?
-            _SINS_ uint8_t _pad[2];
+            _SINS_ uint8_t chain;
+            _SINS_ uint8_t _pad[1];
             _SINS_ uint32_t secs;
             _SINS_ uint32_t ticks;
             _SINS_ uint32_t num_samps;
@@ -137,6 +138,7 @@ typedef struct{
         struct {
             _SINS_ uint32_t addr;
             _SINS_ uint32_t data;
+            _SINS_ uint8_t num_bytes; //1, 2, 4
         } poke_args;
     } data;
 } usrp2_ctrl_data_t;
diff --git a/host/lib/usrp/usrp2/io_impl.cpp b/host/lib/usrp/usrp2/io_impl.cpp
index c87884ebb..5820841d7 100644
--- a/host/lib/usrp/usrp2/io_impl.cpp
+++ b/host/lib/usrp/usrp2/io_impl.cpp
@@ -222,12 +222,12 @@ size_t usrp2_impl::recv(
 ){
     //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();
-        metadata.is_fragment = true;
     }
 
     //extract the number of samples available to copy
@@ -240,6 +240,11 @@ size_t usrp2_impl::recv(
     );
     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 the samples from the recv buffer
     switch(io_type.tid){
     case io_type_t::COMPLEX_FLOAT32:
diff --git a/host/lib/usrp/usrp2/mboard_impl.cpp b/host/lib/usrp/usrp2/mboard_impl.cpp
index 7594c85fa..94ab88a6b 100644
--- a/host/lib/usrp/usrp2/mboard_impl.cpp
+++ b/host/lib/usrp/usrp2/mboard_impl.cpp
@@ -29,7 +29,7 @@ using namespace uhd::usrp;
  * Helper Methods
  **********************************************************************/
 void usrp2_impl::mboard_init(void){
-    _mboards[""] = wax_obj_proxy::make(
+    _mboard_proxy = wax_obj_proxy::make(
         boost::bind(&usrp2_impl::mboard_get, this, _1, _2),
         boost::bind(&usrp2_impl::mboard_set, this, _1, _2)
     );
@@ -67,19 +67,56 @@ void usrp2_impl::update_clock_config(void){
     }
 
     //set the pps flags
-    this->poke(FR_TIME64_FLAGS, pps_flags);
+    this->poke32(FR_TIME64_FLAGS, pps_flags);
 
     //TODO clock source ref 10mhz (spi ad9510)
 }
 
 void usrp2_impl::set_time_spec(const time_spec_t &time_spec, bool now){
     //set ticks and seconds
-    this->poke(FR_TIME64_SECS, time_spec.secs);
-    this->poke(FR_TIME64_TICKS, time_spec.ticks);
+    this->poke32(FR_TIME64_SECS, time_spec.secs);
+    this->poke32(FR_TIME64_TICKS, time_spec.ticks);
 
     //set the register to latch it all in
     boost::uint32_t imm_flags = (now)? FRF_TIME64_LATCH_NOW : FRF_TIME64_LATCH_NEXT_PPS;
-    this->poke(FR_TIME64_IMM, imm_flags);
+    this->poke32(FR_TIME64_IMM, imm_flags);
+}
+
+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.ticks);
+
+    //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 = ctrl_send_and_recv(out_data);
+    ASSERT_THROW(htonl(in_data.id) == USRP2_CTRL_ID_GOT_THAT_STREAM_COMMAND_DUDE);
 }
 
 /***********************************************************************
@@ -136,21 +173,21 @@ void usrp2_impl::mboard_get(const wax::obj &key_, wax::obj &val){
         return;
 
     case MBOARD_PROP_RX_DBOARD:
-        ASSERT_THROW(_rx_dboards.has_key(name));
-        val = _rx_dboards[name]->get_link();
+        ASSERT_THROW(name == "");
+        val = _rx_dboard_proxy->get_link();
         return;
 
     case MBOARD_PROP_RX_DBOARD_NAMES:
-        val = prop_names_t(_rx_dboards.get_keys());
+        val = prop_names_t(1, "");
         return;
 
     case MBOARD_PROP_TX_DBOARD:
-        ASSERT_THROW(_tx_dboards.has_key(name));
-        val = _tx_dboards[name]->get_link();
+        ASSERT_THROW(name == "");
+        val = _tx_dboard_proxy->get_link();
         return;
 
     case MBOARD_PROP_TX_DBOARD_NAMES:
-        val = prop_names_t(_tx_dboards.get_keys());
+        val = prop_names_t(1, "");
         return;
 
     case MBOARD_PROP_CLOCK_RATE:
@@ -158,29 +195,28 @@ void usrp2_impl::mboard_get(const wax::obj &key_, wax::obj &val){
         return;
 
     case MBOARD_PROP_RX_DSP:
-        ASSERT_THROW(_rx_dsps.has_key(name));
-        val = _rx_dsps[name]->get_link();
+        ASSERT_THROW(name == "");
+        val = _rx_dsp_proxy->get_link();
         return;
 
     case MBOARD_PROP_RX_DSP_NAMES:
-        val = prop_names_t(_rx_dsps.get_keys());
+        val = prop_names_t(1, "");
         return;
 
     case MBOARD_PROP_TX_DSP:
-        ASSERT_THROW(_tx_dsps.has_key(name));
-        val = _tx_dsps[name]->get_link();
+        ASSERT_THROW(name == "");
+        val = _tx_dsp_proxy->get_link();
         return;
 
     case MBOARD_PROP_TX_DSP_NAMES:
-        val = prop_names_t(_tx_dsps.get_keys());
+        val = prop_names_t(1, "");
         return;
 
     case MBOARD_PROP_CLOCK_CONFIG:
         val = _clock_config;
         return;
 
-    case MBOARD_PROP_TIME_NOW:
-    case MBOARD_PROP_TIME_NEXT_PPS:
+    default:
         throw std::runtime_error("Error: trying to get write-only property on usrp2 mboard");
 
     }
@@ -226,27 +262,19 @@ void usrp2_impl::mboard_set(const wax::obj &key, const wax::obj &val){
         update_clock_config();
         return;
 
-    case MBOARD_PROP_TIME_NOW:{
+    case MBOARD_PROP_TIME_NOW:
         set_time_spec(val.as<time_spec_t>(), true);
         return;
-    }
 
-    case MBOARD_PROP_TIME_NEXT_PPS:{
+    case MBOARD_PROP_TIME_NEXT_PPS:
         set_time_spec(val.as<time_spec_t>(), false);
         return;
-    }
 
-    case MBOARD_PROP_NAME:
-    case MBOARD_PROP_OTHERS:
-    case MBOARD_PROP_CLOCK_RATE:
-    case MBOARD_PROP_RX_DSP:
-    case MBOARD_PROP_RX_DSP_NAMES:
-    case MBOARD_PROP_TX_DSP:
-    case MBOARD_PROP_TX_DSP_NAMES:
-    case MBOARD_PROP_RX_DBOARD:
-    case MBOARD_PROP_RX_DBOARD_NAMES:
-    case MBOARD_PROP_TX_DBOARD:
-    case MBOARD_PROP_TX_DBOARD_NAMES:
+    case MBOARD_PROP_STREAM_CMD:
+        issue_ddc_stream_cmd(val.as<stream_cmd_t>());
+        return;
+
+    default:
         throw std::runtime_error("Error: trying to set read-only property on usrp2 mboard");
 
     }
diff --git a/host/lib/usrp/usrp2/usrp2_impl.cpp b/host/lib/usrp/usrp2/usrp2_impl.cpp
index b3a22e175..a7be2da8c 100644
--- a/host/lib/usrp/usrp2/usrp2_impl.cpp
+++ b/host/lib/usrp/usrp2/usrp2_impl.cpp
@@ -174,28 +174,47 @@ double usrp2_impl::get_master_clock_freq(void){
     return 100e6;
 }
 
-void usrp2_impl::poke(boost::uint32_t addr, boost::uint32_t data){
+template <class T> void impl_poke(usrp2_impl *impl, boost::uint32_t addr, T data){
     //setup the out data
     usrp2_ctrl_data_t out_data;
     out_data.id = htonl(USRP2_CTRL_ID_POKE_THIS_REGISTER_FOR_ME_BRO);
     out_data.data.poke_args.addr = htonl(addr);
-    out_data.data.poke_args.data = htonl(data);
+    out_data.data.poke_args.data = htonl(boost::uint32_t(data));
+    out_data.data.poke_args.num_bytes = sizeof(T);
 
     //send and recv
-    usrp2_ctrl_data_t in_data = this->ctrl_send_and_recv(out_data);
+    usrp2_ctrl_data_t in_data = impl->ctrl_send_and_recv(out_data);
     ASSERT_THROW(htonl(in_data.id) == USRP2_CTRL_ID_OMG_POKED_REGISTER_SO_BAD_DUDE);
 }
 
-boost::uint32_t usrp2_impl::peek(boost::uint32_t addr){
+template <class T> T impl_peek(usrp2_impl *impl, boost::uint32_t addr){
     //setup the out data
     usrp2_ctrl_data_t out_data;
     out_data.id = htonl(USRP2_CTRL_ID_PEEK_AT_THIS_REGISTER_FOR_ME_BRO);
     out_data.data.poke_args.addr = htonl(addr);
+    out_data.data.poke_args.num_bytes = sizeof(T);
 
     //send and recv
-    usrp2_ctrl_data_t in_data = this->ctrl_send_and_recv(out_data);
+    usrp2_ctrl_data_t in_data = impl->ctrl_send_and_recv(out_data);
     ASSERT_THROW(htonl(in_data.id) == USRP2_CTRL_ID_WOAH_I_DEFINITELY_PEEKED_IT_DUDE);
-    return ntohl(out_data.data.poke_args.data);
+    return T(ntohl(out_data.data.poke_args.data));
+}
+
+
+void usrp2_impl::poke32(boost::uint32_t addr, boost::uint32_t data){
+    return impl_poke<boost::uint32_t>(this, addr, data);
+}
+
+boost::uint32_t usrp2_impl::peek32(boost::uint32_t addr){
+    return impl_peek<boost::uint32_t>(this, addr);
+}
+
+void usrp2_impl::poke16(boost::uint32_t addr, boost::uint16_t data){
+    return impl_poke<boost::uint16_t>(this, addr, data);
+}
+
+boost::uint16_t usrp2_impl::peek16(boost::uint32_t addr){
+    return impl_peek<boost::uint16_t>(this, addr);
 }
 
 /***********************************************************************
@@ -236,12 +255,12 @@ void usrp2_impl::get(const wax::obj &key_, wax::obj &val){
         return;
 
     case DEVICE_PROP_MBOARD:
-        ASSERT_THROW(_mboards.has_key(name));
-        val = _mboards[name]->get_link();
+        ASSERT_THROW(name == "");
+        val = _mboard_proxy->get_link();
         return;
 
     case DEVICE_PROP_MBOARD_NAMES:
-        val = prop_names_t(_mboards.get_keys());
+        val = prop_names_t(1, "");
         return;
 
     case DEVICE_PROP_MAX_RX_SAMPLES:
diff --git a/host/lib/usrp/usrp2/usrp2_impl.hpp b/host/lib/usrp/usrp2/usrp2_impl.hpp
index 55be420cd..baa6530b8 100644
--- a/host/lib/usrp/usrp2/usrp2_impl.hpp
+++ b/host/lib/usrp/usrp2/usrp2_impl.hpp
@@ -103,8 +103,11 @@ public:
     usrp2_ctrl_data_t ctrl_send_and_recv(const usrp2_ctrl_data_t &);
 
     //peek and poke registers
-    void poke(boost::uint32_t addr, boost::uint32_t data);
-    boost::uint32_t peek(boost::uint32_t addr);
+    void poke32(boost::uint32_t addr, boost::uint32_t data);
+    boost::uint32_t peek32(boost::uint32_t addr);
+
+    void poke16(boost::uint32_t addr, boost::uint16_t data);
+    boost::uint16_t peek16(boost::uint32_t addr);
 
     //misc access methods
     double get_master_clock_freq(void);
@@ -135,6 +138,7 @@ private:
     ;
     uhd::transport::smart_buffer::sptr _rx_smart_buff;
     boost::asio::const_buffer _rx_copy_buff;
+    size_t _fragment_offset_in_samps;
     void io_init(void);
 
     //udp transports for control and data
@@ -159,18 +163,18 @@ private:
     void mboard_init(void);
     void mboard_get(const wax::obj &, wax::obj &);
     void mboard_set(const wax::obj &, const wax::obj &);
-    uhd::dict<std::string, wax_obj_proxy::sptr> _mboards;
+    wax_obj_proxy::sptr _mboard_proxy;
 
     //properties interface for rx dboard
     void rx_dboard_get(const wax::obj &, wax::obj &);
     void rx_dboard_set(const wax::obj &, const wax::obj &);
-    uhd::dict<std::string, wax_obj_proxy::sptr> _rx_dboards;
+    wax_obj_proxy::sptr _rx_dboard_proxy;
     uhd::prop_names_t _rx_subdevs_in_use;
 
     //properties interface for tx dboard
     void tx_dboard_get(const wax::obj &, wax::obj &);
     void tx_dboard_set(const wax::obj &, const wax::obj &);
-    uhd::dict<std::string, wax_obj_proxy::sptr> _tx_dboards;
+    wax_obj_proxy::sptr _tx_dboard_proxy;
     uhd::prop_names_t _tx_subdevs_in_use;
     void update_rx_mux_config(void);
     void update_tx_mux_config(void);
@@ -192,12 +196,12 @@ private:
     //properties interface for ddc
     void ddc_get(const wax::obj &, wax::obj &);
     void ddc_set(const wax::obj &, const wax::obj &);
-    uhd::dict<std::string, wax_obj_proxy::sptr> _rx_dsps;
+    wax_obj_proxy::sptr _rx_dsp_proxy;
 
     //properties interface for duc
     void duc_get(const wax::obj &, wax::obj &);
     void duc_set(const wax::obj &, const wax::obj &);
-    uhd::dict<std::string, wax_obj_proxy::sptr> _tx_dsps;
+    wax_obj_proxy::sptr _tx_dsp_proxy;
 
 };
 
diff --git a/host/lib/usrp/usrp2/usrp2_regs.hpp b/host/lib/usrp/usrp2/usrp2_regs.hpp
index 10545d712..0a2de2c6d 100644
--- a/host/lib/usrp/usrp2/usrp2_regs.hpp
+++ b/host/lib/usrp/usrp2/usrp2_regs.hpp
@@ -175,11 +175,14 @@
 //
 // These go to the daughterboard i/o pins
 //
-#define _FR_GPIO_ADDR(off) (0xC800 + (off) * sizeof(boost::uint32_t))
-#define FR_GPIO_IO     _FR_GPIO_ADDR(0)       // tx data in high 16, rx in low 16
-#define FR_GPIO_DDR    _FR_GPIO_ADDR(1)       // 32 bits, 1 means output. tx in high 16, rx in low 16
-#define FR_GPIO_TX_SEL _FR_GPIO_ADDR(2)       // 16 2-bit fields select which source goes to TX DB
-#define FR_GPIO_RX_SEL _FR_GPIO_ADDR(3)       // 16 2-bit fields select which source goes to RX DB
+#define FR_GPIO_BASE 0xC800
+
+#define FR_GPIO_RX_IO      FR_GPIO_BASE + 0  // 16 io data pins
+#define FR_GPIO_TX_IO      FR_GPIO_BASE + 2  // 16 io data pins
+#define FR_GPIO_RX_DDR     FR_GPIO_BASE + 4  // 16 ddr pins, 1 means output
+#define FR_GPIO_TX_DDR     FR_GPIO_BASE + 6  // 16 ddr pins, 1 means output
+#define FR_GPIO_TX_SEL     FR_GPIO_BASE + 8  // 16 2-bit fields select which source goes to TX DB
+#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
@@ -190,10 +193,15 @@
 ///////////////////////////////////////////////////
 // ATR Controller, Slave 11
 ////////////////////////////////////////////////
-#define _FR_ATR_ADDR(off) (0xE400 + (off) * sizeof(boost::uint32_t))
-#define FR_ATR_IDLE    _FR_ATR_ADDR(0) // tx data in high 16, rx in low 16
-#define FR_ATR_TX      _FR_ATR_ADDR(1)
-#define FR_ATR_RX      _FR_ATR_ADDR(2)
-#define FR_ATR_FULL    _FR_ATR_ADDR(3)
+#define FR_ATR_BASE  0xE400
+
+#define FR_ATR_IDLE_RXSIDE  FR_ATR_BASE + 0
+#define FR_ATR_IDLE_TXSIDE  FR_ATR_BASE + 2
+#define FR_ATR_INTX_RXSIDE  FR_ATR_BASE + 4
+#define FR_ATR_INTX_TXSIDE  FR_ATR_BASE + 6
+#define FR_ATR_INRX_RXSIDE  FR_ATR_BASE + 8
+#define FR_ATR_INRX_TXSIDE  FR_ATR_BASE + 10
+#define FR_ATR_FULL_RXSIDE  FR_ATR_BASE + 12
+#define FR_ATR_FULL_TXSIDE  FR_ATR_BASE + 14
 
 #endif /* INCLUDED_USRP2_REGS_HPP */