From: jcorgan <jcorgan@221aa14e-8319-0410-a670-987f0aec2ac5>
Date: Mon, 21 May 2007 05:58:05 +0000 (+0000)
Subject: Merged r5463:5504 from jcorgan/snd into trunk. Work in progress, adds digital loopbac... 
X-Git-Url: https://git.gag.com/?a=commitdiff_plain;h=2711e51f33e4c83b07d8293ceca5d6db7830656e;p=debian%2Fgnuradio

Merged r5463:5504 from jcorgan/snd into trunk. Work in progress, adds digital loopback and receive to FPGA code.  Host receive code is still debugging only.

git-svn-id: http://gnuradio.org/svn/gnuradio/trunk@5505 221aa14e-8319-0410-a670-987f0aec2ac5
---

diff --git a/config/grc_gr_sounder.m4 b/config/grc_gr_sounder.m4
index a821ce4a..929be53a 100644
--- a/config/grc_gr_sounder.m4
+++ b/config/grc_gr_sounder.m4
@@ -27,7 +27,7 @@ AC_DEFUN([GRC_GR_SOUNDER],[
 	 gr-sounder/src/fpga/Makefile \
 	 gr-sounder/src/fpga/top/Makefile \
          gr-sounder/src/fpga/lib/Makefile \
-	 gr-sounder/src/fpga/rbf/Makefile \
+	 gr-sounder/src/fpga/tb/Makefile \
 	 gr-sounder/src/lib/Makefile \
 	 gr-sounder/src/python/Makefile \
          gr-sounder/src/python/run_tests
diff --git a/gr-sounder/src/fpga/Makefile.am b/gr-sounder/src/fpga/Makefile.am
index f4cd4fd4..2e8d8e3f 100644
--- a/gr-sounder/src/fpga/Makefile.am
+++ b/gr-sounder/src/fpga/Makefile.am
@@ -21,4 +21,4 @@
 
 include $(top_srcdir)/Makefile.common
 
-SUBDIRS = top lib rbf
+SUBDIRS = top lib tb
diff --git a/gr-sounder/src/fpga/lib/Makefile.am b/gr-sounder/src/fpga/lib/Makefile.am
index 450981f1..0a03147a 100644
--- a/gr-sounder/src/fpga/lib/Makefile.am
+++ b/gr-sounder/src/fpga/lib/Makefile.am
@@ -28,3 +28,4 @@ EXTRA_DIST = \
 	sounder_rx.v \
 	sounder_tx.v
 
+MOSTLYCLEANFILES = *~
\ No newline at end of file
diff --git a/gr-sounder/src/fpga/lib/dac_interface.v b/gr-sounder/src/fpga/lib/dac_interface.v
index b97ffa77..9042e1c5 100644
--- a/gr-sounder/src/fpga/lib/dac_interface.v
+++ b/gr-sounder/src/fpga/lib/dac_interface.v
@@ -27,16 +27,16 @@ module dac_interface(clk_i,rst_i,ena_i,strobe_i,tx_i_i,tx_q_i,tx_data_o,tx_sync_
    input ena_i;
    input strobe_i;
    
-   input [15:0] tx_i_i;
-   input [15:0] tx_q_i;
+   input [13:0] tx_i_i;
+   input [13:0] tx_q_i;
 
-   output [15:0] tx_data_o;
+   output [13:0] tx_data_o;
    output 	 tx_sync_o;
 
 `ifdef TX_RATE_MAX
    wire clk128;
    reg clk64_d;
-   reg [15:0] tx_data_o;
+   reg [13:0] tx_data_o;
    
    // Create a 128 MHz clock
    dacpll pll128(.areset(rst_i),.inclk0(clk_i),.c0(clk128));
diff --git a/gr-sounder/src/fpga/lib/lfsr_constants.v b/gr-sounder/src/fpga/lib/lfsr_constants.v
index 79fcb1a2..55ee613d 100755
--- a/gr-sounder/src/fpga/lib/lfsr_constants.v
+++ b/gr-sounder/src/fpga/lib/lfsr_constants.v
@@ -24,8 +24,8 @@ module lfsr_constants(degree_i,mask_o,len_o);
    output reg  [15:0] mask_o;
    output wire [15:0] len_o;
    
-   assign len_o = (16'b1 << degree_i) - 1;
-
+   assign len_o = (1 << degree_i) - 1;
+   
    always @*
      case (degree_i)
        5'd00: mask_o = 16'h0000;
diff --git a/gr-sounder/src/fpga/lib/sounder.v b/gr-sounder/src/fpga/lib/sounder.v
index ea4007cb..58b56344 100644
--- a/gr-sounder/src/fpga/lib/sounder.v
+++ b/gr-sounder/src/fpga/lib/sounder.v
@@ -22,10 +22,10 @@
 `include "../../../../usrp/firmware/include/fpga_regs_common.v"
 `include "../../../../usrp/firmware/include/fpga_regs_standard.v"
 
-module sounder(clk_i,saddr_i,sdata_i,s_strobe_i,tx_rst_i,tx_enable_i,tx_strobe_i,
-	       tx_dac_i_o,tx_dac_q_o,
-	       rx_rst_i,rx_enable_i,rx_strobe_i,rx_strobe_o,
-	       rx_adc_i_i,rx_adc_q_i,rx_imp_i_o,rx_imp_q_o);
+module sounder(clk_i, saddr_i, sdata_i, s_strobe_i,
+	       tx_strobe_i, tx_dac_i_o,tx_dac_q_o,
+	       rx_strobe_i, rx_adc_i_i,rx_adc_q_i,
+	       rx_strobe_o, rx_imp_i_o,rx_imp_q_o);
 
    // System interface
    input         clk_i;		// Master clock @ 64 MHz
@@ -34,53 +34,59 @@ module sounder(clk_i,saddr_i,sdata_i,s_strobe_i,tx_rst_i,tx_enable_i,tx_strobe_i
    input 	 s_strobe_i;    // Configuration bus write
    
    // Transmit subsystem
-   input         tx_rst_i;	// Independent subsystem reset
-   input         tx_enable_i;	// Turn on transmitter functionality
    input         tx_strobe_i;	// Generate an transmitter output sample
-   output [15:0] tx_dac_i_o;	// I channel transmitter output to DAC
-   output [15:0] tx_dac_q_o;    // Q channel transmitter output to DAC
+   output [13:0] tx_dac_i_o;	// I channel transmitter output to DAC
+   output [13:0] tx_dac_q_o;    // Q channel transmitter output to DAC
 
    // Receive subsystem
-   input 	 rx_rst_i;	// Independent subsystem reset
-   input 	 rx_enable_i;	// Turn on receiver functionality
    input         rx_strobe_i;	// Indicates receive sample ready from ADC
    output 	 rx_strobe_o;	// Indicates output samples ready for Rx FIFO
-   input  [15:0] rx_adc_i_i;	// I channel input from ADC
-   input  [15:0] rx_adc_q_i;	// Q channel input from ADC
+   input  [15:0] rx_adc_i_i;	// I channel input from ADC interface module
+   input  [15:0] rx_adc_q_i;	// Q channel input from ADC interface module
    output [15:0] rx_imp_i_o;	// I channel impulse response to Rx FIFO
    output [15:0] rx_imp_q_o;	// Q channel impulse response to Rx FIFO
+ 	 
+   // Internal variables
+   wire          reset;
+   wire 	 transmit;
+   wire 	 receive;
+   wire 	 loopback;
 
-   // Configuration
-   wire   [4:0]  degree;	// LFSR register length
-   wire   [15:0] mask;		// LFSR parity mask
-   wire   [15:0] len;		// PN code sequence length
-   wire          loopback;	// Enable digital loopback
+   wire [4:0] 	 degree;
+   wire [15:0] 	 mask;
+   wire [15:0] 	 len;
 
-   // Loopback implementation
-   wire   [15:0] tx_i, tx_q, rx_i, rx_q; // Internal transmit and receive data bus
+   setting_reg #(`FR_USER_0) sr_mode
+     ( .clock(clk_i),.reset(1'b0),.strobe(s_strobe_i),.addr(saddr_i),.in(sdata_i),
+       .out({loopback,receive,transmit,reset}) );
 
-   assign 	 tx_dac_i_o = loopback ? 16'b0 : tx_i;
-   assign 	 tx_dac_q_o = loopback ? 16'b0 : tx_q;
-   assign 	 rx_i = loopback ? tx_i : rx_adc_i_i;
-   assign 	 rx_q = loopback ? tx_q : rx_adc_q_i;
-   
-   setting_reg #(`FR_USER_0) sr_lfsr_degree
+   setting_reg #(`FR_USER_1) sr_lfsr_degree
      ( .clock(clk_i),.reset(1'b0),.strobe(s_strobe_i),.addr(saddr_i),.in(sdata_i),.out(degree) );
+   
+   lfsr_constants constants(.degree_i(degree),.mask_o(mask),.len_o(len));
 
-   setting_reg #(`FR_USER_1) sr_mode
-     ( .clock(clk_i),.reset(1'b0),.strobe(s_strobe_i),.addr(saddr_i),.in(sdata_i),
-       .out({loopback}) );
+   // Loopback implementation
+   wire [13:0] tx_i, tx_q;      
+   wire [15:0] tx_i_ext, tx_q_ext;
+   wire [15:0] rx_i, rx_q; 
 
-   lfsr_constants constants(.degree_i(degree),.mask_o(mask),.len_o(len));
+   sign_extend #(14,16) tx_i_extender(tx_i, tx_i_ext);
+   sign_extend #(14,16) tx_q_extender(tx_q, tx_q_ext);
 
+   assign tx_dac_i_o = loopback ? 14'b0 : tx_i;
+   assign tx_dac_q_o = loopback ? 14'b0 : tx_q;
+   assign rx_i       = loopback ? tx_i_ext : rx_adc_i_i;
+   assign rx_q       = loopback ? tx_q_ext : rx_adc_q_i;
+   
    sounder_tx transmitter
-     ( .clk_i(clk_i),.rst_i(tx_rst_i),.ena_i(tx_enable_i),.strobe_i(tx_strobe_i),.mask_i(mask),
+     ( .clk_i(clk_i),.rst_i(reset),.ena_i(transmit),
+       .strobe_i(tx_strobe_i),.mask_i(mask),
        .tx_i_o(tx_i),.tx_q_o(tx_q) );
    
    sounder_rx receiver
-     ( .clk_i(clk_i),.rst_i(rx_rst_i),.ena_i(rx_enable_i),
-       .rx_strobe_i(rx_strobe_i),.tx_strobe_i(tx_strobe_i),.mask_i(mask),.len_i(len),
+     ( .clk_i(clk_i),.rst_i(reset),.ena_i(receive),
+       .rx_strobe_i(rx_strobe_i),.tx_strobe_i(tx_strobe_i),.mask_i(mask),.degree_i(degree),.len_i(len),
        .rx_in_i_i(rx_i),.rx_in_q_i(rx_q),.rx_i_o(rx_imp_i_o),.rx_q_o(rx_imp_q_o),
-       .rx_strobe_o(rx_strobe_o) );
-   
+       .rx_strobe_o(rx_strobe_o),.loop_i(loopback));
+
 endmodule // sounder
diff --git a/gr-sounder/src/fpga/lib/sounder_rx.v b/gr-sounder/src/fpga/lib/sounder_rx.v
index b7c5f487..338afd55 100644
--- a/gr-sounder/src/fpga/lib/sounder_rx.v
+++ b/gr-sounder/src/fpga/lib/sounder_rx.v
@@ -19,8 +19,9 @@
 //  Foundation, Inc., 51 Franklin Street, Boston, MA  02110-1301  USA
 //
 
-module sounder_rx(clk_i,rst_i,ena_i,rx_strobe_i,tx_strobe_i,mask_i,len_i,
-		  rx_in_i_i,rx_in_q_i,rx_i_o,rx_q_o,rx_strobe_o);
+module sounder_rx(clk_i,rst_i,ena_i,rx_strobe_i,tx_strobe_i,mask_i,degree_i,len_i,
+		  rx_in_i_i,rx_in_q_i,rx_i_o,rx_q_o,rx_strobe_o,
+		  loop_i);
    
    input         clk_i;		// Master clock
    input         rst_i;         // Subsystem reset
@@ -29,6 +30,7 @@ module sounder_rx(clk_i,rst_i,ena_i,rx_strobe_i,tx_strobe_i,mask_i,len_i,
    input         tx_strobe_i;	// Strobe every transmitted sample
     
    input  [15:0] mask_i;	// PN code LFSR mask
+   input  [4:0]  degree_i;	// PN code LFSR sequency degree
    input  [15:0] len_i;		// PN code LFSR sequence length
    input  [15:0] rx_in_i_i;	// I channel on receive
    input  [15:0] rx_in_q_i;	// Q channel on receive
@@ -37,48 +39,57 @@ module sounder_rx(clk_i,rst_i,ena_i,rx_strobe_i,tx_strobe_i,mask_i,len_i,
    output [15:0] rx_q_o;	// Q channel of impulse response
    output        rx_strobe_o;   // Impulse response value ready
 
-   // LFSR phase counter
-   reg [15:0] count;
-   wire cycle = (count == (len_i - 1));
+   input         loop_i;        // Implement loopback
+   
+   wire strobe_in  = loop_i ? tx_strobe_i : rx_strobe_i;
+   wire [16:0] len = loop_i ? (len_i - 1) : ((len_i << 1) - 2);
+		 
+   strobe #(17) phase_strobe(.clk_i(clk_i),.rst_i(rst_i),.ena_i(ena_i),
+		       .rate_i(len),.strobe_i(strobe_in),.strobe_o(rx_strobe_o),
+		       .count_o());
 
-   always @(posedge clk_i)
-     if (rst_i | ~ena_i)
-       count <= 16'b0;
-     else
-       if (cycle)
-	 count <= 16'b0;
-       else
-	 count <= count + 16'b1;
-           
-   // Retard LFSR phase once per cycle
-   wire lfsr_strobe = (tx_strobe_i & ~cycle);
+   wire pn_ref;
+   wire ref_strobe = tx_strobe_i & ~rx_strobe_o; // Retard reference phase once per period
+   lfsr ref_code
+     ( .clk_i(clk_i),.rst_i(rst_i),.ena_i(ena_i),.strobe_i(ref_strobe),.mask_i(mask_i),.pn_o(pn_ref) );
 
-   // Recreate local reference of transmitted PN code
-   wire pn;
-   lfsr reference
-     ( .clk_i(clk_i),.rst_i(rst_i),.ena_i(ena_i),.strobe_i(lfsr_strobe),.mask_i(mask_i),.pn_o(pn) );
+   wire [5:0] offset = (5'd16-degree_i);
+   
+   reg  [31:0] sum_i, sum_q;
+   reg  [31:0] total_i, total_q;
+   wire [31:0] scaled_i = total_i << offset;
+   wire [31:0] scaled_q = total_q << offset;
+   wire [31:0] i_ext, q_ext;
 
-   wire [31:0] rx_i_ext, rx_q_ext;
-   sign_extend #(16,32) i_extend(rx_in_i_i, rx_i_ext);
-   sign_extend #(16,32) q_extend(rx_in_q_i, rx_q_ext);
+   sign_extend #(16,32) i_extender(rx_in_i_i, i_ext);
+   sign_extend #(16,32) q_extender(rx_in_q_i, q_ext);
 
-   reg [31:0] accum;
+   wire [31:0] prod_i = pn_ref ? i_ext : -i_ext;
+   wire [31:0] prod_q = pn_ref ? q_ext : -q_ext;
+   
    always @(posedge clk_i)
      if (rst_i | ~ena_i)
-       accum <= 32'b0;
-     else
-       if (rx_strobe_i)
-	 if (cycle)
-	   accum <= 32'b0;
-	 else
-	   if (pn)
-	     accum <= accum + rx_i_ext;
-	   else
-	     accum <= accum - rx_i_ext;
+       begin
+	  sum_i <= 0;
+	  sum_q <= 0;
+	  total_i <= 0;
+	  total_q <= 0;
+       end
+     else if (rx_strobe_o)
+       begin
+	  total_i <= sum_i + prod_i;
+	  total_q <= sum_q + prod_q;
+	  sum_i <= 0;
+	  sum_q <= 0;
+       end
+     else if (strobe_in)
+       begin
+	  sum_i = sum_i + prod_i;
+	  sum_q = sum_q + prod_q;
+       end
+   
+   assign rx_i_o = scaled_i[31:16];
+   assign rx_q_o = scaled_q[31:16];
    
-   assign rx_i_o = accum[31:16];
-   assign rx_q_o = accum[15:0];
-   assign rx_strobe_o = rx_strobe_i & cycle;
-
 endmodule // sounder_rx
 
diff --git a/gr-sounder/src/fpga/lib/sounder_tx.v b/gr-sounder/src/fpga/lib/sounder_tx.v
index d5300fec..46165dde 100644
--- a/gr-sounder/src/fpga/lib/sounder_tx.v
+++ b/gr-sounder/src/fpga/lib/sounder_tx.v
@@ -22,8 +22,8 @@
 `include "../../../../usrp/firmware/include/fpga_regs_common.v"
 `include "../../../../usrp/firmware/include/fpga_regs_standard.v"
 
-`define MAX_VALUE 16'h7FFF // 2s complement
-`define MIN_VALUE 16'h8000
+`define MAX_VALUE 14'h1FFF // 2s complement
+`define MIN_VALUE 14'h2001
 
 module sounder_tx(clk_i,rst_i,ena_i,strobe_i,mask_i,tx_i_o,tx_q_o);
    input         clk_i;
@@ -31,15 +31,15 @@ module sounder_tx(clk_i,rst_i,ena_i,strobe_i,mask_i,tx_i_o,tx_q_o);
    input         ena_i;
    input         strobe_i;
    input  [15:0] mask_i;
-   output [15:0] tx_i_o;
-   output [15:0] tx_q_o;
+   output [13:0] tx_i_o;
+   output [13:0] tx_q_o;
 
    wire          pn;
 
    lfsr pn_code
      ( .clk_i(clk_i),.rst_i(rst_i),.ena_i(ena_i),.strobe_i(strobe_i),.mask_i(mask_i),.pn_o(pn) );
 
-   assign tx_i_o = pn ? `MAX_VALUE : `MIN_VALUE; // Bipolar
-   assign tx_q_o = 16'b0;
+   assign tx_i_o = ena_i ? (pn ? `MAX_VALUE : `MIN_VALUE) : 14'b0; // Bipolar
+   assign tx_q_o = 14'b0;
 
 endmodule // sounder_tx
diff --git a/gr-sounder/src/fpga/lib/strobe.v b/gr-sounder/src/fpga/lib/strobe.v
new file mode 100644
index 00000000..ed07f21f
--- /dev/null
+++ b/gr-sounder/src/fpga/lib/strobe.v
@@ -0,0 +1,48 @@
+// -*- verilog -*-
+//
+//  USRP - Universal Software Radio Peripheral
+//
+//  Copyright (C) 2007 Corgan Enterprises 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 2 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, write to the Free Software
+//  Foundation, Inc., 51 Franklin Street, Boston, MA  02110-1301  USA
+//
+
+module strobe(clk_i,rst_i,ena_i,rate_i,strobe_i,strobe_o,count_o);
+   parameter width = 16;
+
+   input              clk_i;
+   input 	      rst_i;
+   input 	      ena_i;
+   input  [width-1:0] rate_i;	// Desired period minus one
+   input 	      strobe_i;
+   output 	      strobe_o;
+   output [width-1:0] count_o;
+
+   
+   reg [width-1:0] counter;
+
+   always @(posedge clk_i)
+     if(rst_i | ~ena_i)
+       counter <= 32'hFFFFFFFF;	// First period is short by one
+     else if(strobe_i)
+       if(counter == rate_i)
+	 counter <= 0;
+       else 
+	 counter <= counter + 1;
+
+   assign strobe_o = (counter == rate_i) & strobe_i;
+   assign count_o = counter;
+   
+endmodule // strobe
diff --git a/gr-sounder/src/fpga/rbf/Makefile.am b/gr-sounder/src/fpga/rbf/Makefile.am
deleted file mode 100644
index 5a8b709d..00000000
--- a/gr-sounder/src/fpga/rbf/Makefile.am
+++ /dev/null
@@ -1,44 +0,0 @@
-#
-# Copyright 2005,2006,2007 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 2, 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 GNU Radio; see the file COPYING.  If not, write to
-# the Free Software Foundation, Inc., 51 Franklin Street,
-# Boston, MA 02110-1301, USA.
-# 
-
-include $(top_srcdir)/Makefile.common
-
-datadir = $(prefix)/share/usrp
-
-rbfs = 				\
-	rev2/usrp_sounder.rbf	\
-	rev4/usrp_sounder.rbf
-
-EXTRA_DIST = \
-	$(rbfs)
-
-
-install-data-local:
-	@for file in $(rbfs); do \
-		echo "$(INSTALL_DATA) $(srcdir)/$$file $(DESTDIR)$(datadir)/$$file"; \
-		$(INSTALL_DATA) $(srcdir)/$$file $(DESTDIR)$(datadir)/$$file; \
-	done
-
-uninstall-local:
-	@for file in $(rbfs); do \
-		echo "$(RM) $(DESTDIR)$(datadir)/$$file"; \
-		$(RM) $(DESTDIR)$(datadir)/$$file; \
-	done
diff --git a/gr-sounder/src/fpga/rbf/rev2/usrp_sounder.rbf b/gr-sounder/src/fpga/rbf/rev2/usrp_sounder.rbf
deleted file mode 100755
index 47a0c98f..00000000
Binary files a/gr-sounder/src/fpga/rbf/rev2/usrp_sounder.rbf and /dev/null differ
diff --git a/gr-sounder/src/fpga/rbf/rev4/usrp_sounder.rbf b/gr-sounder/src/fpga/rbf/rev4/usrp_sounder.rbf
deleted file mode 100755
index 47a0c98f..00000000
Binary files a/gr-sounder/src/fpga/rbf/rev4/usrp_sounder.rbf and /dev/null differ
diff --git a/gr-sounder/src/fpga/tb/Makefile.am b/gr-sounder/src/fpga/tb/Makefile.am
new file mode 100644
index 00000000..e668d456
--- /dev/null
+++ b/gr-sounder/src/fpga/tb/Makefile.am
@@ -0,0 +1,30 @@
+#
+# 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 2, 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 GNU Radio; see the file COPYING.  If not, write to
+# the Free Software Foundation, Inc., 51 Franklin Street,
+# Boston, MA 02110-1301, USA.
+# 
+
+include $(top_srcdir)/Makefile.common
+
+EXTRA_DIST = \
+	sounder_tb.v \
+	sounder_tb.sav \
+	sounder_tb.sh \
+	sounder_tb_wave.sh
+
+MOSTLYCLEANFILES = *~ *.vcd *.out* sounder_tb
\ No newline at end of file
diff --git a/gr-sounder/src/fpga/tb/sounder_tb.sav b/gr-sounder/src/fpga/tb/sounder_tb.sav
new file mode 100644
index 00000000..74019f5e
--- /dev/null
+++ b/gr-sounder/src/fpga/tb/sounder_tb.sav
@@ -0,0 +1,34 @@
+*-26.117517 250000000 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1
+@28
+sounder_tb.uut.clk_i
+sounder_tb.rst
+sounder_tb.s_strobe
+@22
+sounder_tb.sdata[31:0]
+@28
+sounder_tb.uut.reset
+sounder_tb.uut.transmit
+sounder_tb.uut.receive
+sounder_tb.uut.loopback
+@200
+-
+@22
+sounder_tb.uut.degree[4:0]
+sounder_tb.uut.len[15:0]
+@200
+-
+@28
+sounder_tb.tx_dac_i[13:0]
+@200
+-
+@22
+sounder_tb.fifo_strobe
+sounder_tb.fifo_i[15:0]
+sounder_tb.fifo_q[15:0]
+@200
+-
+@22
+sounder_tb.uut.transmitter.pn_code.pn_o
+sounder_tb.uut.receiver.pn_ref
+@200
+-
diff --git a/gr-sounder/src/fpga/tb/sounder_tb.sh b/gr-sounder/src/fpga/tb/sounder_tb.sh
new file mode 100755
index 00000000..9bc71438
--- /dev/null
+++ b/gr-sounder/src/fpga/tb/sounder_tb.sh
@@ -0,0 +1,7 @@
+#!/bin/sh
+iverilog -y ../lib/ -y ../../../../usrp/fpga/sdr_lib 	        \
+    sounder_tb.v -o sounder_tb 				     && \
+./sounder_tb                                       > sounder_tb.out  && \
+grep 'rst=0'         sounder_tb.out | grep 'clk=1' > sounder_tb.out2 && \
+grep 'tx_strobe=1'   sounder_tb.out2               > sounder_tb.out3
+    
diff --git a/gr-sounder/src/fpga/tb/sounder_tb.v b/gr-sounder/src/fpga/tb/sounder_tb.v
new file mode 100644
index 00000000..045791e4
--- /dev/null
+++ b/gr-sounder/src/fpga/tb/sounder_tb.v
@@ -0,0 +1,212 @@
+// -*- verilog -*-
+//
+//  USRP - Universal Software Radio Peripheral
+//
+//  Copyright (C) 2007 Corgan Enterprises 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 2 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, write to the Free Software
+//  Foundation, Inc., 51 Franklin Street, Boston, MA  02110-1301  USA
+//
+
+`timescale 1ns/1ps
+
+`include "../lib/sounder.v"
+
+`define FR_MODE 		7'd64
+`define bmFR_MODE_RESET		32'h0001
+`define bmFR_MODE_TX            32'h0002
+`define bmFR_MODE_RX            32'h0004
+`define bmFR_MODE_LP            32'h0008
+
+`define FR_DEGREE		7'd65
+
+module sounder_tb;
+
+   // System bus
+   reg         clk;
+   reg         rst;
+   reg         ena;
+   
+   // Configuration bus
+   reg [6:0]   saddr;
+   reg [31:0]  sdata;
+   reg 	       s_strobe;
+
+   // DAC bus
+   reg         tx_strobe;
+   wire [13:0] tx_dac_i;
+   wire [13:0] tx_dac_q;
+
+   // ADC bus
+   reg         rx_strobe;
+   reg [15:0]  rx_adc_i;
+   reg [15:0]  rx_adc_q;
+   
+   // FIFO bus
+   wire        fifo_strobe;
+   wire [15:0] fifo_i;
+   wire [15:0] fifo_q;
+   
+   // Configuration shadow registers
+   reg [31:0]  mode;
+   reg [31:0]  degree;
+   
+   sounder uut
+     (.clk_i(clk),.saddr_i(saddr),.sdata_i(sdata),.s_strobe_i(s_strobe),
+      .tx_strobe_i(tx_strobe),.tx_dac_i_o(tx_dac_i),.tx_dac_q_o(tx_dac_q),
+      .rx_strobe_i(rx_strobe),.rx_adc_i_i(rx_adc_i),.rx_adc_q_i(rx_adc_q),
+      .rx_strobe_o(fifo_strobe),.rx_imp_i_o(fifo_i),.rx_imp_q_o(fifo_q));
+
+   // Drive tx_strobe @ half clock rate
+   always @(posedge clk)
+     tx_strobe <= ~tx_strobe;
+   
+   // Start up initialization
+   initial
+     begin
+	clk = 0;
+	rst = 0;
+	ena = 0;
+	saddr = 0;
+	sdata = 0;
+	s_strobe = 0;
+	tx_strobe = 0;
+	rx_strobe = 1;
+	rx_adc_i = 0;
+	rx_adc_q = 0;
+	mode = 0;
+	degree = 0;
+	
+	@(posedge clk);
+	rst = 1;
+	@(posedge clk);
+	rst = 0;
+	@(posedge clk);
+	ena = 1;
+     end
+   
+   always
+     #5 clk <= ~clk;
+   
+   initial
+     begin
+	$monitor($time, " clk=%b rst=%b tx_strobe=%b fifo_strobe=%b phs=%x pn_o=%b pn_ref=%b fifo_i=%x fifo_q=", 
+		 clk, uut.reset, tx_strobe, fifo_strobe, uut.receiver.phase_strobe.count_o,
+		 uut.transmitter.pn, uut.receiver.pn_ref, fifo_i, fifo_q);
+	$dumpfile("sounder_tb.vcd");
+	$dumpvars(0, sounder_tb);
+     end
+
+   // Test tasks
+   task write_cfg_register;
+      input [6:0]  regno;
+      input [31:0] value;
+      
+      begin
+	 @(posedge clk);
+	 saddr <= regno;
+	 sdata <= value;
+	 s_strobe <= 1'b1;
+	 @(posedge clk);
+	 s_strobe <= 0;
+      end
+   endtask // write_cfg_register
+   
+   // Application reset line
+   task set_reset;
+      input reset;
+      
+      begin
+	 mode = reset ? (mode | `bmFR_MODE_RESET) : (mode & ~`bmFR_MODE_RESET);
+	 write_cfg_register(`FR_MODE, mode);
+      end
+   endtask // reset
+   
+   // Set the PN code degree
+   task set_degree;
+      input [5:0] degree;
+      begin
+	 write_cfg_register(`FR_DEGREE, degree);
+      end
+   endtask // set_degree
+   
+   // Turn on or off the transmitter
+   task enable_tx;
+      input tx;
+
+      begin
+	 mode = tx ? (mode | `bmFR_MODE_TX) : (mode & ~`bmFR_MODE_TX);
+	 write_cfg_register(`FR_MODE, mode);
+      end
+   endtask // enable_tx
+
+   // Turn on or off the receiver
+   task enable_rx;
+      input rx;
+
+      begin
+	 mode = rx ? (mode | `bmFR_MODE_RX) : (mode & ~`bmFR_MODE_RX);
+	 write_cfg_register(`FR_MODE, mode);
+      end
+   endtask // enable_rx
+
+
+   // Turn on or off digital loopback
+   task enable_lp;
+      input lp;
+
+      begin
+	 mode = lp ? (mode | `bmFR_MODE_LP) : (mode & ~`bmFR_MODE_LP);
+	 write_cfg_register(`FR_MODE, mode);
+      end
+   endtask // enable_lp
+   
+   // Test transmitter functionality
+   task test_tx;
+      input [5:0] degree;
+      
+      begin
+	 #20 set_reset(1);
+	 #20 set_degree(degree);
+	 #20 enable_tx(1);
+	 #20 set_reset(0);
+	 #(uut.len*20);		// One PN code period
+
+      end
+   endtask // test_tx
+   
+   // Test loopback functionality
+   task test_lp;
+      input [5:0] degree;
+      
+      begin
+	 #20 set_reset(1);
+	 #20 set_degree(degree);
+	 #20 enable_tx(1);
+	 #20 enable_rx(1);
+	 #20 enable_lp(1);
+	 #20 set_reset(0);
+	 #((uut.len+1)*uut.len*20);
+      end
+   endtask // test_lp
+   
+   // Execute tests
+   initial
+     begin
+        #20 test_tx(12);
+	#20 test_lp(12);
+	#100 $finish;
+     end
+endmodule
+
diff --git a/gr-sounder/src/fpga/tb/sounder_tb_wave.sh b/gr-sounder/src/fpga/tb/sounder_tb_wave.sh
new file mode 100755
index 00000000..4551d5c5
--- /dev/null
+++ b/gr-sounder/src/fpga/tb/sounder_tb_wave.sh
@@ -0,0 +1,2 @@
+#!/bin/sh
+gtkwave sounder_tb.vcd sounder_tb.sav
diff --git a/gr-sounder/src/fpga/top/Makefile.am b/gr-sounder/src/fpga/top/Makefile.am
index 69f6fef9..9498d434 100644
--- a/gr-sounder/src/fpga/top/Makefile.am
+++ b/gr-sounder/src/fpga/top/Makefile.am
@@ -21,23 +21,43 @@
 
 include $(top_srcdir)/Makefile.common
 
+datadir = $(prefix)/share/usrp
+
 EXTRA_DIST =			\
 	config.vh		\
 	usrp_sounder.v		\
 	usrp_sounder.csf	\
 	usrp_sounder.esf	\
 	usrp_sounder.psf	\
-	usrp_sounder.qpf
+	usrp_sounder.qpf	\
+	$(RBFS)
+
+RBFS = 	usrp_sounder.rbf
+
+install-data-local:
+	@for file in $(RBFS); do \
+		echo "$(INSTALL_DATA) $(srcdir)/$$file $(DESTDIR)$(datadir)/rev2/$$file"; \
+		$(INSTALL_DATA) $(srcdir)/$$file $(DESTDIR)$(datadir)/rev2/$$file; \
+		echo "$(INSTALL_DATA) $(srcdir)/$$file $(DESTDIR)$(datadir)/rev4/$$file"; \
+		$(INSTALL_DATA) $(srcdir)/$$file $(DESTDIR)$(datadir)/rev4/$$file; \
+	done
+
+uninstall-local:
+	@for file in $(rbfs); do \
+		echo "$(RM) $(DESTDIR)$(datadir)/rev2/$$file"; \
+		$(RM) $(DESTDIR)$(datadir)/rev2/$$file; \
+		echo "$(RM) $(DESTDIR)$(datadir)/rev4/$$file"; \
+		$(RM) $(DESTDIR)$(datadir)/rev4/$$file; \
+	done
 
 MOSTLYCLEANFILES = 	\
 	db/*		\
 	*.rpt		\
 	*.summary	\
-	*.rbf		\
 	*.qws		\
 	*.smsg		\
 	*.done		\
 	*.pin		\
-	*.sof
-
+	*.sof		\
+	*~
 
diff --git a/gr-sounder/src/fpga/top/usrp_sounder.qsf b/gr-sounder/src/fpga/top/usrp_sounder.qsf
index bda317db..5ff52583 100755
--- a/gr-sounder/src/fpga/top/usrp_sounder.qsf
+++ b/gr-sounder/src/fpga/top/usrp_sounder.qsf
@@ -368,15 +368,16 @@ set_instance_assignment -name CLOCK_SETTINGS master_clk -to master_clk
 set_instance_assignment -name PARTITION_HIERARCHY no_file_for_top_partition -to | -section_id Top
 set_global_assignment -name PARTITION_NETLIST_TYPE SOURCE -section_id Top
 
-set_global_assignment -name VERILOG_FILE ../../../../usrp/fpga/sdr_lib/sign_extend.v
+set_global_assignment -name VERILOG_FILE ../lib/strobe.v
 set_global_assignment -name VERILOG_FILE ../lib/lfsr_constants.v
-set_global_assignment -name VERILOG_FILE ../lib/sounder.v
 set_global_assignment -name VERILOG_FILE ../lib/lfsr.v
-set_global_assignment -name VERILOG_FILE ../../../../usrp/fpga/sdr_lib/atr_delay.v
 set_global_assignment -name VERILOG_FILE ../lib/dac_interface.v
 set_global_assignment -name VERILOG_FILE ../lib/dacpll.v
 set_global_assignment -name VERILOG_FILE ../lib/sounder_rx.v
 set_global_assignment -name VERILOG_FILE ../lib/sounder_tx.v
+set_global_assignment -name VERILOG_FILE ../lib/sounder.v
+set_global_assignment -name VERILOG_FILE ../../../../usrp/fpga/sdr_lib/atr_delay.v
+set_global_assignment -name VERILOG_FILE ../../../../usrp/fpga/sdr_lib/sign_extend.v
 set_global_assignment -name VERILOG_FILE ../../../../usrp/fpga/sdr_lib/rx_buffer.v
 set_global_assignment -name VERILOG_FILE ../../../../usrp/fpga/sdr_lib/setting_reg.v
 set_global_assignment -name VERILOG_FILE ../../../../usrp/fpga/sdr_lib/strobe_gen.v
diff --git a/gr-sounder/src/fpga/top/usrp_sounder.rbf b/gr-sounder/src/fpga/top/usrp_sounder.rbf
new file mode 100755
index 00000000..b6f49422
Binary files /dev/null and b/gr-sounder/src/fpga/top/usrp_sounder.rbf differ
diff --git a/gr-sounder/src/fpga/top/usrp_sounder.v b/gr-sounder/src/fpga/top/usrp_sounder.v
index 05b71bbb..bb630569 100644
--- a/gr-sounder/src/fpga/top/usrp_sounder.v
+++ b/gr-sounder/src/fpga/top/usrp_sounder.v
@@ -103,14 +103,14 @@ module usrp_sounder
    ////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
    // Transmit Side
    
-   wire [15:0] tx_i, tx_q;
-   wire [15:0] tx_dac;
+   wire [13:0] tx_i, tx_q;
+   wire [13:0] tx_dac;
    
    dac_interface dac(.clk_i(clk64),.rst_i(tx_dsp_reset),.ena_i(enable_tx),
 		     .strobe_i(tx_sample_strobe),.tx_i_i(tx_i),.tx_q_i(tx_q),
 		     .tx_data_o(tx_dac),.tx_sync_o(TXSYNC_A));
 
-   assign tx_a = tx_dac[15:2];
+   assign tx_a = tx_dac;
 
    // Wedge DAC #2 at zero
    assign TXSYNC_B = 1'b0;
@@ -151,10 +151,9 @@ module usrp_sounder
 
    sounder sounder
      ( .clk_i(clk64),.saddr_i(serial_addr),.sdata_i(serial_data),.s_strobe_i(serial_strobe),
-       .tx_rst_i(tx_dsp_reset),.tx_enable_i(enable_tx),.tx_strobe_i(tx_sample_strobe),
-       .tx_dac_i_o(tx_i),.tx_dac_q_o(tx_q),
-       .rx_rst_i(rx_dsp_reset),.rx_enable_i(enable_rx),.rx_strobe_i(rx_sample_strobe),.rx_strobe_o(rx_strobe),
-       .rx_adc_i_i(rx_adc0_i),.rx_adc_q_i(rx_adc0_q),.rx_imp_i_o(rx_buf_i),.rx_imp_q_o(rx_buf_q)
+       .tx_strobe_i(tx_sample_strobe),.tx_dac_i_o(tx_i),.tx_dac_q_o(tx_q),
+       .rx_strobe_i(rx_sample_strobe),.rx_adc_i_i(rx_adc0_i),.rx_adc_q_i(rx_adc0_q),
+       .rx_strobe_o(rx_strobe),.rx_imp_i_o(rx_buf_i),.rx_imp_q_o(rx_buf_q)
        );
 
    
diff --git a/gr-sounder/src/python/Makefile.am b/gr-sounder/src/python/Makefile.am
index ecc9d839..7ce18127 100644
--- a/gr-sounder/src/python/Makefile.am
+++ b/gr-sounder/src/python/Makefile.am
@@ -29,4 +29,4 @@ EXTRA_DIST = 		\
 bin_SCRIPTS = 		\
 	usrp_sounder.py
 
-MOSTLYCLEANFILES = *~ *.pyc *.pyo
+MOSTLYCLEANFILES = *~ *.pyc *.pyo output.*
diff --git a/gr-sounder/src/python/test_lp.sh b/gr-sounder/src/python/test_lp.sh
new file mode 100755
index 00000000..fbcc3f53
--- /dev/null
+++ b/gr-sounder/src/python/test_lp.sh
@@ -0,0 +1,4 @@
+#!/bin/sh
+
+usrp_sounder.py -r -l -t -n5000 -d12
+hexdump output.dat >output.hex
diff --git a/gr-sounder/src/python/test_rx.sh b/gr-sounder/src/python/test_rx.sh
new file mode 100755
index 00000000..21998b4d
--- /dev/null
+++ b/gr-sounder/src/python/test_rx.sh
@@ -0,0 +1,4 @@
+#!/bin/sh
+
+usrp_sounder.py -r -n5000 -d12
+hexdump output.dat >output.hex
diff --git a/gr-sounder/src/python/test_tx.sh b/gr-sounder/src/python/test_tx.sh
new file mode 100755
index 00000000..f29ba1f3
--- /dev/null
+++ b/gr-sounder/src/python/test_tx.sh
@@ -0,0 +1,3 @@
+#!/bin/sh
+
+usrp_sounder.py -t -f 16M -d12
diff --git a/gr-sounder/src/python/usrp_sounder.py b/gr-sounder/src/python/usrp_sounder.py
index ca722a49..31e766ef 100755
--- a/gr-sounder/src/python/usrp_sounder.py
+++ b/gr-sounder/src/python/usrp_sounder.py
@@ -28,68 +28,141 @@ import sys, time
 
 n2s = eng_notation.num_to_str
 
-# Set to 0 for 32 MHz tx clock, 1 for 64 MHz tx clock
-# Must match config.vh in FPGA code
-TX_RATE_MAX = 0
-_tx_freq_divisor = 32e6*(TX_RATE_MAX+1)
-
-class sounder_tx:
-    def __init__(self, frequency, degree, loopback):
-	self.trans = usrp.sink_s(fpga_filename='usrp_sounder.rbf')
-        self.subdev_spec = usrp.pick_tx_subdevice(self.trans)
-        self.subdev = usrp.selected_subdev(self.trans, self.subdev_spec)
-        self.trans.tune(0, self.subdev, frequency)
-        self.set_degree(degree);
-        self.set_loopback(loopback)
-            
-    def turn_on(self):
-	self.trans.start()
+FR_MODE = usrp.FR_USER_0
+bmFR_MODE_RESET = 1 << 0	# bit 0: active high reset
+bmFR_MODE_TX    = 1 << 1	# bit 1: enable transmitter
+bmFR_MODE_RX    = 1 << 2	# bit 2: enable receiver
+bmFR_MODE_LP    = 1 << 3	# bit 3: enable digital loopback
+
+FR_DEGREE = usrp.FR_USER_1
+
+class sounder:
+    def __init__(self, options):
+	self._options = options
+	self._mode = 0
 	
-    def turn_off(self):
-	self.trans.stop()
-
-    def set_degree(self, value):
-        return self.trans._write_fpga_reg(usrp.FR_USER_0, value);
-
+	self._u = None
+	self._trans = None
+	self._rcvr = None
+	self._transmitting = False
+	self._receiving = False
+		
+	if options.transmit:
+	    print "Creating sounder transmitter."
+	    self._trans = usrp.sink_s(fpga_filename='usrp_sounder.rbf')
+            self._trans_subdev_spec = usrp.pick_tx_subdevice(self._trans)
+	    self._trans_subdev = usrp.selected_subdev(self._trans, self._trans_subdev_spec)
+	    self._trans.start()
+	    self._u = self._trans
+	        
+	if options.receive:
+	    print "Creating sounder receiver."
+            self._fg = gr.flow_graph()
+    	    self._rcvr = usrp.source_s(fpga_filename='usrp_sounder.rbf', decim_rate=128)
+	    self._rcvr_subdev_spec = usrp.pick_rx_subdevice(self._rcvr)
+	    self._rcvr_subdev = usrp.selected_subdev(self._rcvr, self._rcvr_subdev_spec)
+	    self._sink = gr.file_sink(gr.sizeof_short, "output.dat")
+
+	    if options.samples >= 0:
+		self._head = gr.head(gr.sizeof_short, options.samples*gr.sizeof_short)
+		self._fg.connect(self._rcvr, self._head, self._sink)
+	    else:
+		self._fg.connect(self._rcvr, self._sink)
+	    self._u = self._rcvr # either receiver or transmitter object will do
+	
+	self.set_reset(True)
+	self.set_freq(options.frequency)
+	self.set_degree(options.degree)
+	self.set_loopback(options.loopback)	
+	self.set_reset(False)
+		
+    def set_freq(self, frequency):
+	print "Setting center frequency to", n2s(frequency)
+	if self._rcvr:
+	    self._rcvr.tune(0, self._rcvr_subdev, frequency)
+	
+	if self._trans:
+	    self._trans.tune(0, self._trans_subdev, frequency)
+
+    def set_degree(self, degree):
+	print "Setting PN code degree to", degree
+        self._u._write_fpga_reg(FR_DEGREE, degree);
+	    
+    def _write_mode(self):
+	print "Writing mode register with:", hex(self._mode)
+        self._u._write_fpga_reg(FR_MODE, self._mode)
+
+    def enable_tx(self, value):
+	if value:
+	    print "Enabling transmitter."
+	    self._mode |= bmFR_MODE_TX
+	    self._transmitting = True
+	else:
+	    print "Disabling transmitter."
+	    self._mode &= ~bmFR_MODE_TX
+	self._write_mode()
+		    
+    def enable_rx(self, value):
+	if value:
+	    print "Starting receiver flow graph."
+	    self._mode |= bmFR_MODE_RX
+	    self._write_mode()
+	    self._fg.start()
+	    self._receiving = True
+	    if self._options.samples >= 0:
+		self._fg.wait()
+	else:
+	    print "Stopping receiver flow graph."
+	    if self._options.samples < 0:
+		self._fg.stop()
+		print "Waiting for threads..."
+		self._fg.wait()
+		print "Receiver flow graph stopped."
+	    self._mode &= ~bmFR_MODE_RX
+	    self._write_mode()
+	    self._receiving = False
+	        
     def set_loopback(self, value):
-        return self.trans._write_fpga_reg(usrp.FR_USER_1, value==True);
-
-class sounder_rx:
-    def __init__(self, frequency, degree, samples):
-        self.fg = gr.flow_graph()
-	self.rcvr = usrp.source_s(fpga_filename='usrp_sounder.rbf', decim_rate=8)
-        self.subdev_spec = usrp.pick_rx_subdevice(self.rcvr)
-        self.subdev = usrp.selected_subdev(self.rcvr, self.subdev_spec)
-        self.rcvr.tune(0, self.subdev, frequency)
-        self.set_degree(degree);
-	self.sink = gr.file_sink(gr.sizeof_short, "output.dat")
-
-	if samples >= 0:
-	    self.head = gr.head(gr.sizeof_short, 2*samples*gr.sizeof_short)
-	    self.fg.connect(self.rcvr, self.head, self.sink)
+	if value:
+	    print "Enabling digital loopback."
+	    self._mode |= bmFR_MODE_LP
 	else:
-	    self.fg.connect(self.rcvr, self.sink)
-
-    def receive(self):
-	self.fg.run()
-	
-    def set_degree(self, value):
-        return self.rcvr._write_fpga_reg(usrp.FR_USER_0, value);
-
+	    print "Disabling digital loopback."
+	    self._mode &= ~bmFR_MODE_LP
+	self._write_mode()
+
+    def set_reset(self, value):
+	if value:
+	    print "Asserting reset."
+	    self._mode |= bmFR_MODE_RESET
+	else:
+	    print "De-asserting reset."
+	    self._mode &= ~bmFR_MODE_RESET
+	self._write_mode()
+
+    def __del__(self):
+	if self._transmitting:
+	    self.enable_tx(False)
+	    
+	if self._receiving:
+	    self.enable_rx(False)
+	    
+# ------------------------------------------------------------------------------
+    
 def main():
     parser = OptionParser(option_class=eng_option)
     parser.add_option("-f", "--frequency", type="eng_float", default=0.0,
                       help="set frequency to FREQ in Hz, default is %default", metavar="FREQ")
 
+    parser.add_option("-d", "--degree", type="int", default=16,
+                      help="set souding sequence degree (len=2^degree-1), default is %default")
+
     parser.add_option("-t", "--transmit", action="store_true", default=False,
                       help="enable sounding transmitter")
 
     parser.add_option("-r", "--receive", action="store_true", default=False,
                       help="enable sounding receiver")
 
-    parser.add_option("-d", "--degree", type="int", default=16,
-                      help="set souding sequence degree (len=2^degree-1), default is %default")
-
     parser.add_option("-n", "--samples", type="int", default=-1,
                       help="number of samples to capture on receive, default is infinite")
 
@@ -105,26 +178,16 @@ def main():
     print "Using PN code degree of", options.degree, "length", 2**options.degree-1
     print "Sounding frequency range is", n2s(options.frequency-16e6), "to", n2s(options.frequency+16e6)
     
-    if (options.transmit):
-	print "Enabling sounder transmitter."
-	if (options.loopback):
-	    print "Enabling digital loopback."
-        tx = sounder_tx(options.frequency, options.degree, options.loopback)
-	tx.turn_on()
-	
-    try:
-        if (options.receive):
-    	    print "Enabling sounder receiver."
-	    rx = sounder_rx(options.frequency, options.degree, options.samples)
-	    rx.receive()
-	else:
-	    if (options.transmit):
-		while (True): time.sleep(1.0)
+    s = sounder(options)
+
+    if options.transmit:
+	s.enable_tx(True)
 
-    except KeyboardInterrupt:
-	if (options.transmit):
-	    tx.turn_off()
+    if options.receive:
+	s.enable_rx(True)
 
+    if options.samples < 0:
+        raw_input("Press enter to exit.")
 	
 if __name__ == "__main__":
     main()