1 files changed, 65 insertions, 0 deletions
diff --git a/gr-usrp/apps/usrp_test_loopback.py b/gr-usrp/apps/usrp_test_loopback.py
new file mode 100755
index 000000000..b58ac06ae
--- /dev/null
+++ b/gr-usrp/apps/usrp_test_loopback.py
@@ -0,0 +1,65 @@
+#!/usr/bin/env python
+#
+# Copyright 2004,2007 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 GNU Radio; see the file COPYING.  If not, write to
+# the Free Software Foundation, Inc., 51 Franklin Street,
+# Boston, MA 02110-1301, USA.
+# 
+
+"""
+Digital loopback (Tx to Rx) for the USRP Rev1.
+"""
+
+
+from gnuradio import gr
+from gnuradio import usrp
+
+
+def ramp_source (tb):
+    period = 2**16
+    src = gr.vector_source_s (range (-period/2, period/2, 1), True)
+    return src
+
+def build_graph ():
+    tx_interp =  32       # tx should be twice rx
+    rx_decim  =  16
+    
+    tb = gr.top_block ()
+
+    data_src = ramp_source (tb)
+    # usrp_tx = usrp.sink_s (0, tx_interp, 1, 0x98)
+    usrp_tx = usrp.sink_s (0, tx_interp)
+    tb.connect (data_src, usrp_tx)
+
+    usrp_rx = usrp.source_s (0, rx_decim, 1, 0x32103210, usrp.FPGA_MODE_LOOPBACK)
+    sink = gr.check_counting_s ()
+    tb.connect (usrp_rx, sink)
+
+    # file_sink = gr.file_sink (gr.sizeof_short, "loopback.dat")
+    # tb.connect (usrp_rx, file_sink)
+    
+    return tb
+    
+def main ():
+    tb = build_graph ()
+    try:
+        tb.run()
+    except KeyboardInterrupt:
+        pass
+
+if __name__ == '__main__':
+    main ()