7 files changed, 16 insertions, 0 deletions
diff --git a/host/lib/usrp/b100/io_impl.cpp b/host/lib/usrp/b100/io_impl.cpp
index abbd9864f..ccd00a91f 100644
--- a/host/lib/usrp/b100/io_impl.cpp
+++ b/host/lib/usrp/b100/io_impl.cpp
@@ -286,6 +286,7 @@ tx_streamer::sptr b100_impl::get_tx_stream(const uhd::stream_args_t &args_){
     for (size_t chan_i = 0; chan_i < args.channels.size(); chan_i++){
         const size_t dsp = args.channels[chan_i];
         UHD_ASSERT_THROW(dsp == 0); //always 0
+        _tx_dsp->clear();
         my_streamer->set_xport_chan_get_buff(chan_i, boost::bind(
             &zero_copy_if::get_send_buff, _data_transport, _1
         ));
diff --git a/host/lib/usrp/cores/rx_dsp_core_200.cpp b/host/lib/usrp/cores/rx_dsp_core_200.cpp
index b97f9c58e..7c9fe0695 100644
--- a/host/lib/usrp/cores/rx_dsp_core_200.cpp
+++ b/host/lib/usrp/cores/rx_dsp_core_200.cpp
@@ -79,7 +79,12 @@ public:
         _iface->poke32(REG_RX_CTRL_VRT_TLR, 0);
     }
 
+    void clear(void){
+        _iface->poke32(REG_RX_CTRL_CLEAR, 1); //reset
+    }
+
     void set_nsamps_per_packet(const size_t nsamps){
+        this->clear(); // a good place to clear as well!
         _iface->poke32(REG_RX_CTRL_NSAMPS_PP, nsamps);
     }
 
diff --git a/host/lib/usrp/cores/rx_dsp_core_200.hpp b/host/lib/usrp/cores/rx_dsp_core_200.hpp
index 89b8c1f51..58be51eee 100644
--- a/host/lib/usrp/cores/rx_dsp_core_200.hpp
+++ b/host/lib/usrp/cores/rx_dsp_core_200.hpp
@@ -36,6 +36,8 @@ public:
         const boost::uint32_t sid, const bool lingering_packet = false
     );
 
+    virtual void clear(void) = 0;
+
     virtual void set_nsamps_per_packet(const size_t nsamps) = 0;
 
     virtual void issue_stream_command(const uhd::stream_cmd_t &stream_cmd) = 0;
diff --git a/host/lib/usrp/cores/tx_dsp_core_200.cpp b/host/lib/usrp/cores/tx_dsp_core_200.cpp
index 9d90d30cc..38d04a7de 100644
--- a/host/lib/usrp/cores/tx_dsp_core_200.cpp
+++ b/host/lib/usrp/cores/tx_dsp_core_200.cpp
@@ -65,6 +65,10 @@ public:
         _iface->poke32(REG_TX_CTRL_POLICY, FLAG_TX_CTRL_POLICY_NEXT_PACKET);
     }
 
+    void clear(void){
+        _iface->poke32(REG_TX_CTRL_CLEAR_STATE, 1); //reset
+    }
+
     void set_tick_rate(const double rate){
         _tick_rate = rate;
     }
diff --git a/host/lib/usrp/cores/tx_dsp_core_200.hpp b/host/lib/usrp/cores/tx_dsp_core_200.hpp
index e6be63557..50d128df4 100644
--- a/host/lib/usrp/cores/tx_dsp_core_200.hpp
+++ b/host/lib/usrp/cores/tx_dsp_core_200.hpp
@@ -34,6 +34,8 @@ public:
         const boost::uint32_t sid
     );
 
+    virtual void clear(void) = 0;
+
     virtual void set_tick_rate(const double rate) = 0;
 
     virtual void set_link_rate(const double rate) = 0;
diff --git a/host/lib/usrp/e100/io_impl.cpp b/host/lib/usrp/e100/io_impl.cpp
index 3b0828b45..855fda0d7 100644
--- a/host/lib/usrp/e100/io_impl.cpp
+++ b/host/lib/usrp/e100/io_impl.cpp
@@ -362,6 +362,7 @@ tx_streamer::sptr e100_impl::get_tx_stream(const uhd::stream_args_t &args_){
     for (size_t chan_i = 0; chan_i < args.channels.size(); chan_i++){
         const size_t dsp = args.channels[chan_i];
         UHD_ASSERT_THROW(dsp == 0); //always 0
+        _tx_dsp->clear();
         my_streamer->set_xport_chan_get_buff(chan_i, boost::bind(
             &zero_copy_if::get_send_buff, _data_transport, _1
         ));
diff --git a/host/lib/usrp/usrp2/io_impl.cpp b/host/lib/usrp/usrp2/io_impl.cpp
index 8018875ec..742fe3e94 100644
--- a/host/lib/usrp/usrp2/io_impl.cpp
+++ b/host/lib/usrp/usrp2/io_impl.cpp
@@ -474,6 +474,7 @@ tx_streamer::sptr usrp2_impl::get_tx_stream(const uhd::stream_args_t &args_){
             num_chan_so_far += _mbc[mb].tx_chan_occ;
             if (chan < num_chan_so_far){
                 const size_t dsp = chan + _mbc[mb].tx_chan_occ - num_chan_so_far;
+                _mbc[mb].tx_dsp->clear();
                 my_streamer->set_xport_chan_get_buff(chan_i, boost::bind(
                     &usrp2_impl::io_impl::get_send_buff, _io_impl.get(), abs, _1
                 ));