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

5 files changed, 285 insertions, 0 deletions

diff --git a/gr-sounder/src/fpga/tb/Makefile.am b/gr-sounder/src/fpga/tb/Makefile.am
new file mode 100644
index 000000000..e668d4568
--- /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 000000000..74019f5ee
--- /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 000000000..9bc714387
--- /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 000000000..045791e43
--- /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 000000000..4551d5c59
--- /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