Merged r9564:9568 from jcorgan/bert into trunk. Adds BPSK bit error testing examples and support blocks.

git-svn-id: http://gnuradio.org/svn/gnuradio/trunk@9569 221aa14e-8319-0410-a670-987f0aec2ac5

1 files changed, 111 insertions, 0 deletions

diff --git a/gnuradio-examples/python/digital-bert/benchmark_tx.py b/gnuradio-examples/python/digital-bert/benchmark_tx.py
new file mode 100755
index 000000000..1778a74b5
--- /dev/null
+++ b/gnuradio-examples/python/digital-bert/benchmark_tx.py
@@ -0,0 +1,111 @@
+#!/usr/bin/env python
+#
+# Copyright 2008 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.
+#
+
+from gnuradio import gr, eng_notation, usrp
+from gnuradio.eng_option import eng_option
+from optparse import OptionParser
+from transmit_path import transmit_path
+import sys
+
+_dac_rate = 128e6
+
+n2s = eng_notation.num_to_str
+
+class tx_bpsk_block(gr.top_block):
+    def __init__(self, options):    
+	gr.top_block.__init__(self, "tx_mpsk")
+
+        self._transmitter = transmit_path(options.sps,
+                                          options.excess_bw,
+                                          options.amplitude)
+
+        if_rate = options.rate*options.sps
+        interp = int(_dac_rate/if_rate)
+
+        print "Modulation:", n2s(options.rate), "bits/sec"
+        print "TX IF rate:", n2s(if_rate), "samples/sec"
+        print "USRP interpolation:", interp
+        print "DAC amplitude:", options.amplitude
+
+        self._setup_usrp(options.which,
+                         interp,
+                         options.tx_subdev_spec,
+                         options.freq)
+	
+	self.connect(self._transmitter, self._usrp)
+
+        
+    def _setup_usrp(self, which, interp, subdev_spec, freq):
+        self._usrp = usrp.sink_c(which=which, interp_rate=interp)
+	if subdev_spec is None:
+	    subdev_spec = usrp.pick_tx_subdevice(self._usrp)
+	self._usrp.set_mux(usrp.determine_tx_mux_value(self._usrp, subdev_spec))
+	self._subdev = usrp.selected_subdev(self._usrp, subdev_spec)
+	tr = usrp.tune(self._usrp, self._subdev._which, self._subdev, freq)
+        if not (tr):
+            print "Failed to tune to center frequency!"
+        else:
+            print "Center frequency:", n2s(freq)
+        gain = float(self._subdev.gain_range()[1]) # Max TX gain
+	self._subdev.set_gain(gain)
+	self._subdev.set_enable(True)
+        print "TX d'board:", self._subdev.side_and_name()
+        
+
+def get_options():
+    parser = OptionParser(option_class=eng_option)
+    parser.add_option("-w", "--which", type="int", default=0,
+                      help="select which USRP (0, 1, ...) default is %default",
+                      metavar="NUM")
+    parser.add_option("-T", "--tx-subdev-spec", type="subdev", default=None,
+                      help="select USRP Tx side A or B (default=first one with a daughterboard)")
+    parser.add_option("-f", "--freq", type="eng_float", default=None,
+                      help="set frequency to FREQ", metavar="FREQ")
+    parser.add_option("-a", "--amplitude", type="eng_float", default=2000,
+                      help="set Tx amplitude (0-32767) (default=%default)")
+    parser.add_option("-r", "--rate", type="eng_float", default=250e3,
+                      help="Select modulation symbol rate (default=%default)")
+    parser.add_option("", "--sps", type="int", default=2,
+                      help="Select samples per symbol (default=%default)")
+    parser.add_option("", "--excess-bw", type="eng_float", default=0.35,
+                      help="Select RRC excess bandwidth (default=%default)")
+		      
+    (options, args) = parser.parse_args()
+    if len(args) != 0:
+        parser.print_help()
+        sys.exit(1)
+	
+    if options.freq == None:
+        print "Must supply frequency as -f or --freq"
+        sys.exit(1)
+
+    return (options, args)
+
+if __name__ == "__main__":
+    (options, args) = get_options()
+    
+    tb = tx_bpsk_block(options)
+
+    try:
+        tb.run()
+    except KeyboardInterrupt:
+        pass