[Commit-gnuradio] r6327 - gnuradio/trunk/usrp/host/apps-inband

[eb]

Author: eb
Date: 2007-09-05 15:33:05 -0600 (Wed, 05 Sep 2007)
New Revision: 6327

Added:
   gnuradio/trunk/usrp/host/apps-inband/test_usrp_inband_underrun.cc
Modified:
   gnuradio/trunk/usrp/host/apps-inband/
   gnuradio/trunk/usrp/host/apps-inband/Makefile.am
   gnuradio/trunk/usrp/host/apps-inband/read_packets.cc
Log:
Merged George's changes from features/inband-usb r6309:6325 into trunk.



Property changes on: gnuradio/trunk/usrp/host/apps-inband
___________________________________________________________________
Name: svn:ignore
   - Makefile
Makefile.in
.la
.lo
.deps
.libs
*.la
*.lo
*.dat
usrper
usrper2
test_input
test_fusb
test_usrp
test_usrp0
test_usrp_standard_rx
test_usrp_standard_tx
test_usrp_inband_timestamps
test_usrp_inband_registers
test_usrp_inband_rx
test_usrp_inband_tx
test_usrp_basic_rx
check_order_quickly
usrp_cal_dc_offset
test_usrp_inband_cs
read_packets
test_usrp_inband_ping

   + Makefile
Makefile.in
.la
.lo
.deps
.libs
*.la
*.lo
*.dat
usrper
usrper2
test_input
test_fusb
test_usrp
test_usrp0
test_usrp_standard_rx
test_usrp_standard_tx
test_usrp_inband_timestamps
test_usrp_inband_registers
test_usrp_inband_rx
test_usrp_inband_tx
test_usrp_basic_rx
check_order_quickly
usrp_cal_dc_offset
test_usrp_inband_cs
read_packets
test_usrp_inband_ping
test_usrp_inband_underrun


Modified: gnuradio/trunk/usrp/host/apps-inband/Makefile.am
===================================================================
--- gnuradio/trunk/usrp/host/apps-inband/Makefile.am    2007-09-05 21:17:06 UTC 
(rev 6326)
+++ gnuradio/trunk/usrp/host/apps-inband/Makefile.am    2007-09-05 21:33:05 UTC 
(rev 6327)
@@ -35,6 +35,7 @@
        test_usrp_inband_rx             \
        test_usrp_inband_tx             \
        test_usrp_inband_timestamps     \
+       test_usrp_inband_underrun       \
        read_packets
 
 noinst_HEADERS =                       \
@@ -57,6 +58,9 @@
 test_usrp_inband_registers_SOURCES     = test_usrp_inband_registers.cc 
ui_sincos.c
 test_usrp_inband_registers_LDADD       = $(USRP_LA) $(USRP_INBAND_LA)
 
+test_usrp_inband_underrun_SOURCES      = test_usrp_inband_underrun.cc
+test_usrp_inband_underrun_LDADD        = $(USRP_LA) $(USRP_INBAND_LA)
+
 test_usrp_inband_rx_SOURCES    = test_usrp_inband_rx.cc ui_sincos.c
 test_usrp_inband_rx_LDADD      = $(USRP_LA) $(USRP_INBAND_LA)
 

Modified: gnuradio/trunk/usrp/host/apps-inband/read_packets.cc
===================================================================
--- gnuradio/trunk/usrp/host/apps-inband/read_packets.cc        2007-09-05 
21:17:06 UTC (rev 6326)
+++ gnuradio/trunk/usrp/host/apps-inband/read_packets.cc        2007-09-05 
21:33:05 UTC (rev 6327)
@@ -73,6 +73,12 @@
 //    if(pkt->carrier_sense())
 //      printf("\tcarrier sense\n");
 
+    if(pkt->underrun())
+      printf("\tunderrun\n");
+    
+    if(pkt->overrun())
+      printf("\toverrun\n");
+
     printf("\tchannel: \t0x%x\n", pkt->chan());
     printf("\ttimestamp: \t0x%x\n", pkt->timestamp());
     //printf("\ttimestamp: \t%u\n", pkt->timestamp());

Copied: gnuradio/trunk/usrp/host/apps-inband/test_usrp_inband_underrun.cc (from 
rev 6326, 
gnuradio/branches/features/inband-usb/usrp/host/apps/test_usrp_inband_underrun.cc)
===================================================================
--- gnuradio/trunk/usrp/host/apps-inband/test_usrp_inband_underrun.cc           
                (rev 0)
+++ gnuradio/trunk/usrp/host/apps-inband/test_usrp_inband_underrun.cc   
2007-09-05 21:33:05 UTC (rev 6327)
@@ -0,0 +1,670 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2007 Free Software Foundation, Inc.
+ * 
+ * This file is part of GNU Radio
+ * 
+ * GNU Radio 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, or (at your option)
+ * any later version.
+ * 
+ * GNU Radio 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, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <mb_mblock.h>
+#include <mb_runtime.h>
+#include <mb_runtime_nop.h>            // QA only
+#include <mb_protocol_class.h>
+#include <mb_exception.h>
+#include <mb_msg_queue.h>
+#include <mb_message.h>
+#include <mb_mblock_impl.h>
+#include <mb_msg_accepter.h>
+#include <mb_class_registry.h>
+#include <pmt.h>
+#include <stdio.h>
+#include <string.h>
+#include <sys/time.h>
+#include <iostream>
+#include <ui_nco.h>
+
+// Include the symbols needed for communication with USRP server
+#include <symbols_usrp_server_cs.h>
+#include <symbols_usrp_channel.h>
+#include <symbols_usrp_low_level_cs.h>
+#include <symbols_usrp_tx.h>
+#include <symbols_usrp_rx.h>
+
+static bool verbose = true;
+
+class test_usrp_inband_underrun : public mb_mblock
+{
+
+  mb_port_sptr  d_tx;   // Ports connected to the USRP server
+  mb_port_sptr  d_rx;
+  mb_port_sptr  d_cs;
+
+  pmt_t   d_tx_chan;    // Returned channel from TX allocation
+  pmt_t   d_rx_chan;    // Returned channel from RX allocation
+
+  pmt_t   d_which_usrp; // The USRP to use for the test
+
+  long    d_warm_msgs;  // The number of messages to 'warm' the USRP
+  long    d_warm_recvd; // The number of msgs received in the 'warm' state
+
+  // Keep track of current state
+  enum state_t {
+    INIT,
+    OPENING_USRP,
+    ALLOCATING_CHANNELS,
+    WRITE_REGISTER,
+    READ_REGISTER,
+    TRANSMITTING,
+    CLOSING_CHANNELS,
+    CLOSING_USRP,
+  };
+  state_t d_state;
+  
+  long         d_nsamples_to_send;
+  long         d_nsamples_xmitted;
+  long         d_nframes_xmitted;
+  long         d_samples_per_frame;
+  bool         d_done_sending;
+
+  // for generating sine wave output
+  ui_nco<float,float>  d_nco;
+  double               d_amplitude;
+
+  long d_n_underruns;
+
+ public:
+  test_usrp_inband_underrun(mb_runtime *runtime, const std::string 
&instance_name, pmt_t user_arg);
+  ~test_usrp_inband_underrun();
+  void initial_transition();
+  void handle_message(mb_message_sptr msg);
+
+ protected:
+  void opening_usrp();
+  void allocating_channels();
+  void write_register();
+  void read_register();
+  void closing_channels();
+  void closing_usrp();
+  void enter_receiving();
+  void enter_transmitting();
+  void build_and_send_ping();
+  void build_and_send_next_frame();
+  void handle_xmit_response(pmt_t handle);
+  void handle_recv_response(pmt_t dict);
+};
+
+
+int
+main (int argc, char **argv)
+{
+  // handle any command line args here
+
+  mb_runtime_sptr rt = mb_make_runtime();
+  pmt_t result = PMT_NIL;
+
+  rt->run("top", "test_usrp_inband_underrun", PMT_F, &result);
+}
+
+
+test_usrp_inband_underrun::test_usrp_inband_underrun(mb_runtime *runtime, 
const std::string &instance_name, pmt_t user_arg)
+  : mb_mblock(runtime, instance_name, user_arg),
+  d_tx_chan(PMT_NIL),
+  d_rx_chan(PMT_NIL),
+  d_which_usrp(pmt_from_long(0)),
+  d_state(INIT),
+  d_nsamples_to_send((long) 50e6),
+  d_nsamples_xmitted(0),
+  d_nframes_xmitted(0),
+  d_samples_per_frame(d_nsamples_to_send),     // full packet
+
+  d_done_sending(false),
+  d_amplitude(16384),
+  d_n_underruns(0)
+{
+  
+  // A dictionary is used to pass parameters to the USRP
+  pmt_t usrp_dict = pmt_make_dict();
+
+  // Specify the RBF to use
+  pmt_dict_set(usrp_dict,
+               pmt_intern("rbf"),
+               pmt_intern("merge4.rbf"));
+
+  // Set TX and RX interpolations
+  pmt_dict_set(usrp_dict,
+               pmt_intern("interp-tx"),
+               pmt_from_long(16));
+
+  pmt_dict_set(usrp_dict,
+               pmt_intern("interp-rx"),
+               pmt_from_long(16));
+  
+  d_tx = define_port("tx0", "usrp-tx", false, mb_port::INTERNAL);
+  d_rx = define_port("rx0", "usrp-rx", false, mb_port::INTERNAL);
+  d_cs = define_port("cs", "usrp-server-cs", false, mb_port::INTERNAL);
+
+  // Create an instance of USRP server and connect ports
+  define_component("server", "usrp_server", usrp_dict);
+  connect("self", "tx0", "server", "tx0");
+  connect("self", "rx0", "server", "rx0");
+  connect("self", "cs", "server", "cs");
+
+  // initialize NCO
+  double freq = 100e3;
+  int interp = 32;                         // 32 -> 4MS/s
+  double sample_rate = 128e6 / interp; 
+  d_nco.set_freq(2*M_PI * freq/sample_rate);
+}
+
+test_usrp_inband_underrun::~test_usrp_inband_underrun()
+{
+}
+
+void
+test_usrp_inband_underrun::initial_transition()
+{
+  opening_usrp();
+}
+
+// Handle message reads all incoming messages from USRP server which will be
+// initialization and ping responses.  We perform actions based on the current
+// state and the event (ie, ping response)
+void
+test_usrp_inband_underrun::handle_message(mb_message_sptr msg)
+{
+  pmt_t event = msg->signal();
+  pmt_t data = msg->data();
+  pmt_t port_id = msg->port_id();
+
+  pmt_t handle = PMT_F;
+  pmt_t status = PMT_F;
+  pmt_t dict = PMT_NIL;
+  std::string error_msg;
+      
+  // Check the recv sample responses for underruns and count
+  if(pmt_eq(event, s_response_recv_raw_samples)) {
+    handle = pmt_nth(0, data);
+    status = pmt_nth(1, data);
+    dict   = pmt_nth(4, data);
+
+    if(pmt_eq(status, PMT_T)) {
+      handle_recv_response(dict);
+      return;
+    }
+    else {
+      error_msg = "error while receiving samples:";
+      goto bail;
+    }
+  }
+
+
+  // Dispatch based on state
+  switch(d_state) {
+
+    //----------------------------- OPENING_USRP ----------------------------//
+    // We only expect a response from opening the USRP which should be 
succesful
+    // or failed.
+    case OPENING_USRP:
+      
+      if(pmt_eq(event, s_response_open)) {
+
+        status = pmt_nth(1, data);          // failed/succes
+        
+        if(pmt_eq(status, PMT_T)) {
+          allocating_channels();
+          return;
+        }
+        else {
+          error_msg = "failed to open usrp:";
+          goto bail;
+        }
+
+      }
+
+      goto unhandled;   // all other messages not handled in this state
+      
+    
+    //----------------------- ALLOCATING CHANNELS --------------------//
+    // When allocating channels, we need to wait for 2 responses from
+    // USRP server: one for TX and one for RX.  Both are initialized to
+    // NIL so we know to continue to the next state once both are set.
+    case ALLOCATING_CHANNELS:
+
+      // A TX allocation response
+      if(pmt_eq(event, s_response_allocate_channel)
+          && pmt_eq(d_tx->port_symbol(), port_id)) 
+      {
+        status = pmt_nth(1, data);
+        
+        // If successful response, extract the channel
+        if(pmt_eq(status, PMT_T)) {
+          
+          d_tx_chan = pmt_nth(2, data);
+
+          if(verbose)
+            std::cout << "[TEST_USRP_INBAND_UNDERRUN] Received TX allocation"
+                      << " on channel " << d_tx_chan << std::endl;
+
+          // If the RX has also been allocated already, we can continue
+          if(!pmt_eqv(d_rx_chan, PMT_NIL)) {
+            enter_receiving();
+            //enter_transmitting();
+          }
+
+          return;
+        }
+        else {  // TX allocation failed
+          error_msg = "failed to allocate TX channel:";
+          goto bail;
+        }
+      }
+      
+      // A RX allocation response
+      if(pmt_eq(event, s_response_allocate_channel)
+          && pmt_eq(d_rx->port_symbol(), port_id)) 
+      {
+        status = pmt_nth(1, data);
+        
+        // If successful response, extract the channel
+        if(pmt_eq(status, PMT_T)) {
+          
+          d_rx_chan = pmt_nth(2, data);
+
+          if(verbose)
+            std::cout << "[TEST_USRP_INBAND_UNDERRUN] Received RX allocation"
+                      << " on channel " << d_rx_chan << std::endl;
+
+          // If the TX has also been allocated already, we can continue
+          if(!pmt_eqv(d_tx_chan, PMT_NIL)) {
+            enter_receiving();
+            //enter_transmitting();
+          }
+
+          return;
+        }
+        else {  // RX allocation failed
+          error_msg = "failed to allocate RX channel:";
+          goto bail;
+        }
+      }
+
+      goto unhandled;
+
+    case WRITE_REGISTER:
+      goto unhandled;
+
+    case READ_REGISTER:
+      goto unhandled;
+
+    //-------------------------- TRANSMITTING ----------------------------//
+    // In the transmit state we count the number of underruns received and
+    // ballpark the number with an expected count (something >1 for starters)
+    case TRANSMITTING:
+      
+      // Check that the transmits are OK
+      if (pmt_eq(event, s_response_xmit_raw_frame)){
+        handle = pmt_nth(0, data);
+        status = pmt_nth(1, data);
+
+        if (pmt_eq(status, PMT_T)){
+          handle_xmit_response(handle);
+          return;
+        }
+        else {
+          error_msg = "bad response-xmit-raw-frame:";
+          goto bail;
+        }
+      }
+
+      goto unhandled;
+
+    //------------------------- CLOSING CHANNELS ----------------------------//
+    // Check deallocation responses, once the TX and RX channels are both
+    // deallocated then we close the USRP.
+    case CLOSING_CHANNELS:
+      
+      if (pmt_eq(event, s_response_deallocate_channel)
+          && pmt_eq(d_tx->port_symbol(), port_id))
+      {
+        status = pmt_nth(1, data);
+
+        // If successful, set the port to NIL
+        if(pmt_eq(status, PMT_T)) {
+          d_tx_chan = PMT_NIL;
+
+          if(verbose)
+            std::cout << "[TEST_USRP_INBAND_UNDERRUN] Received TX 
deallocation\n";
+
+          // If the RX is also deallocated, we can close the USRP
+          if(pmt_eq(d_rx_chan, PMT_NIL)) 
+            closing_usrp();
+
+          return;
+
+        } else {
+
+          error_msg = "failed to deallocate TX channel:";
+          goto bail;
+
+        }
+      }
+
+      if (pmt_eq(event, s_response_deallocate_channel)
+          && pmt_eq(d_rx->port_symbol(), port_id))
+      {
+        status = pmt_nth(1, data);
+
+        // If successful, set the port to NIL
+        if(pmt_eq(status, PMT_T)) {
+          d_rx_chan = PMT_NIL;
+
+          if(verbose)
+            std::cout << "[TEST_USRP_INBAND_UNDERRUN] Received RX 
deallocation\n";
+
+          // If the TX is also deallocated, we can close the USRP
+          if(pmt_eq(d_tx_chan, PMT_NIL)) 
+            closing_usrp();
+
+          return;
+
+        } else {
+          
+          error_msg = "failed to deallocate RX channel:";
+          goto bail;
+
+        }
+      }
+
+      goto unhandled;
+
+    //--------------------------- CLOSING USRP ------------------------------//
+    // Once we have received a successful USRP close response, we shutdown all
+    // mblocks and exit.
+    case CLOSING_USRP:
+      
+      if (pmt_eq(event, s_response_close)) {
+        
+        status = pmt_nth(1, data);
+
+        if(pmt_eq(status, PMT_T)) {
+
+          if(verbose)
+            std::cout << "[TEST_USRP_INBAND_UNDERRUN] Successfully closed 
USRP\n";
+
+          std::cout << "\nUnderruns: " << d_n_underruns << std::endl;
+
+          shutdown_all(PMT_T);
+          return;
+
+        } else {
+
+          error_msg = "failed to close USRP:";
+          goto bail;
+        }
+      }
+
+      goto unhandled;
+
+    case INIT:
+      goto unhandled;
+
+  }
+ 
+ // An error occured, print it, and shutdown all m-blocks
+ bail:
+  std::cerr << error_msg << data
+           << "status = " << status << std::endl;
+  shutdown_all(PMT_F);
+  return;
+
+ // Received an unhandled message for a specific state
+ unhandled:
+  if(verbose && !pmt_eq(event, pmt_intern("%shutdown")))
+    std::cout << "test_usrp_inband_tx: unhandled msg: " << msg
+              << "in state "<< d_state << std::endl;
+
+}
+
+
+// Sends a command to USRP server to open up a connection to the
+// specified USRP, which is defaulted to USRP 0 on the system
+void
+test_usrp_inband_underrun::opening_usrp()
+{
+
+  if(verbose)
+    std::cout << "[TEST_USRP_INBAND_UNDERRUN] Opening USRP " 
+              << d_which_usrp << std::endl;
+
+  d_cs->send(s_cmd_open, pmt_list2(PMT_NIL, d_which_usrp));
+  d_state = OPENING_USRP;
+}
+
+// RX and TX channels must be allocated so that the USRP server can
+// properly share bandwidth across multiple USRPs.  No commands will be
+// successful to the USRP through the USRP server on the TX or RX channels 
until
+// a bandwidth allocation has been received.
+void
+test_usrp_inband_underrun::allocating_channels()
+{
+  d_state = ALLOCATING_CHANNELS;
+
+  long capacity = (long) 16e6;
+  d_tx->send(s_cmd_allocate_channel, pmt_list2(PMT_T, 
pmt_from_long(capacity)));
+  d_rx->send(s_cmd_allocate_channel, pmt_list2(PMT_T, 
pmt_from_long(capacity)));
+}
+
+// After allocating the channels, a write register command will be sent to the
+// USRP.
+void
+test_usrp_inband_underrun::write_register()
+{
+  d_state = WRITE_REGISTER;
+
+  long reg = 0;
+
+  d_tx->send(s_cmd_to_control_channel,    // C/S packet
+             pmt_list2(PMT_NIL,           // invoc handle
+                       pmt_list1(
+                            pmt_list2(s_op_write_reg, 
+                                      pmt_list2(
+                                      pmt_from_long(reg), 
+                                      pmt_from_long(0xbeef))))));
+
+  if(verbose)
+    std::cout << "[TEST_USRP_INBAND_REGISTERS] Writing 0xbeef to " 
+              << reg << std::endl;
+
+  read_register();  // immediately transition to read the register
+}
+
+// Temporary: for testing pings
+void
+test_usrp_inband_underrun::build_and_send_ping()
+{
+  
+  d_tx->send(s_cmd_to_control_channel,
+             pmt_list2(PMT_NIL, pmt_list1(pmt_list2(s_op_ping_fixed,
+                                                    pmt_list2(pmt_from_long(0),
+                                                              
pmt_from_long(0))))));
+
+  std::cout << "[TEST_USRP_INBAND_UNDERRUN] Ping sent" << std::endl;
+}
+
+// After writing to the register, we want to read the value back and ensure 
that
+// it is the same value that we wrote.
+void
+test_usrp_inband_underrun::read_register()
+{
+  d_state = READ_REGISTER;
+
+  long reg = 9;
+
+  d_tx->send(s_cmd_to_control_channel,    // C/S packet
+             pmt_list2(PMT_NIL,           // invoc handle
+                       pmt_list1(
+                            pmt_list2(s_op_read_reg, 
+                                      pmt_list2(
+                                      pmt_from_long(0),   // rid 
+                                      pmt_from_long(reg))))));
+  if(verbose)
+    std::cout << "[TEST_USRP_INBAND_UNDERRUN] Reading from register " 
+              << reg << std::endl;
+}
+
+// Used to enter the receiving state
+void
+test_usrp_inband_underrun::enter_receiving()
+{
+  d_rx->send(s_cmd_start_recv_raw_samples,
+             pmt_list2(PMT_F,
+                       d_rx_chan));
+
+  if(verbose)
+    std::cout << "[TEST_USRP_INBAND_UNDERRUN] Started RX sample stream\n";
+}
+
+void
+test_usrp_inband_underrun::enter_transmitting()
+{
+  d_state = TRANSMITTING;
+  d_nsamples_xmitted = 0;
+
+  if(verbose)
+    std::cout << "[TEST_USRP_INBAND_UNDERRUN] Entering transmit state...\n";
+  
+  build_and_send_next_frame(); // fire off 4 to start pipeline
+  build_and_send_next_frame();
+  build_and_send_next_frame();
+  build_and_send_next_frame();
+}
+
+void
+test_usrp_inband_underrun::build_and_send_next_frame()
+{
+
+  long nsamples_this_frame =
+    std::min(d_nsamples_to_send - d_nsamples_xmitted,
+            d_samples_per_frame);
+
+  if (nsamples_this_frame == 0){
+    d_done_sending = true;
+    return;
+  }
+    
+  size_t nshorts = 2 * nsamples_this_frame;    // 16-bit I & Q
+  pmt_t uvec = pmt_make_s16vector(nshorts, 0);
+  size_t ignore;
+  int16_t *samples = pmt_s16vector_writeable_elements(uvec, ignore);
+
+  // fill in the complex sinusoid
+
+  for (int i = 0; i < nsamples_this_frame; i++){
+
+    if (1){
+      gr_complex s;
+      d_nco.sincos(&s, 1, d_amplitude);
+      // write 16-bit i & q
+      samples[2*i] =   (int16_t) s.real();
+      samples[2*i+1] = (int16_t) s.imag();
+    }
+    else {
+      gr_complex s(d_amplitude, d_amplitude);
+
+      // write 16-bit i & q
+      samples[2*i] =   (int16_t) s.real();
+      samples[2*i+1] = (int16_t) s.imag();
+    }
+  }
+
+  if(verbose)
+    std::cout << "[TEST_USRP_INBAND_TX] Transmitting frame...\n";
+
+  pmt_t timestamp = pmt_from_long(0xffffffff); // NOW
+  d_tx->send(s_cmd_xmit_raw_frame,
+            pmt_list4(pmt_from_long(d_nframes_xmitted),  // invocation-handle
+                      d_tx_chan,                         // channel
+                      uvec,                              // the samples
+                      timestamp));
+
+  d_nsamples_xmitted += nsamples_this_frame;
+  d_nframes_xmitted++;
+
+  if(verbose)
+    std::cout << "[TEST_USRP_INBAND_TX] Transmitted frame\n";
+
+}
+
+void
+test_usrp_inband_underrun::handle_xmit_response(pmt_t handle)
+{
+  if (d_done_sending &&
+      pmt_to_long(handle) == (d_nframes_xmitted - 1)){
+    // We're done sending and have received all responses
+    //closing_channels();
+    return;
+  }
+
+  build_and_send_next_frame();
+}
+
+void
+test_usrp_inband_underrun::handle_recv_response(pmt_t dict)
+{
+  if(!pmt_is_dict(dict)) {
+    std::cout << "[TEST_USRP_INBAND_UNDERRUN] Recv samples dictionary is 
improper\n";
+    return;
+  }
+
+  // Read the TX interpolations
+  if(pmt_t underrun = pmt_dict_ref(dict, 
+                                  pmt_intern("underrun"), 
+                                  PMT_NIL)) {
+    if(pmt_eqv(underrun, PMT_T)) 
+      d_n_underruns++;
+
+    if(verbose)
+      std::cout << "[TEST_USRP_INBAND_UNDERRUN] Underrun\n";
+  } else {
+
+    if(verbose)
+      std::cout << "[TEST_USRP_INBAND_UNDERRUN] No underrun\n";
+  }
+  
+}
+
+void
+test_usrp_inband_underrun::closing_channels()
+{
+  d_state = CLOSING_CHANNELS;
+
+  d_tx->send(s_cmd_deallocate_channel, pmt_list2(PMT_NIL, d_tx_chan));
+  d_rx->send(s_cmd_deallocate_channel, pmt_list2(PMT_NIL, d_rx_chan));
+}
+
+void
+test_usrp_inband_underrun::closing_usrp()
+{
+  d_state = CLOSING_USRP;
+
+  d_cs->send(s_cmd_close, pmt_list1(PMT_NIL));
+}
+
+REGISTER_MBLOCK_CLASS(test_usrp_inband_underrun);