1 files changed, 86 insertions, 0 deletions
diff --git a/gnuradio-examples/python/digital/usrp_receive_path.py b/gnuradio-examples/python/digital/usrp_receive_path.py
new file mode 100644
index 000000000..fd47c2725
--- /dev/null
+++ b/gnuradio-examples/python/digital/usrp_receive_path.py
@@ -0,0 +1,86 @@
+#
+# Copyright 2009 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
+import usrp_options
+import receive_path
+from pick_bitrate import pick_rx_bitrate
+from gnuradio import eng_notation
+
+def add_freq_option(parser):
+    """
+    Hackery that has the -f / --freq option set both tx_freq and rx_freq
+    """
+    def freq_callback(option, opt_str, value, parser):
+        parser.values.rx_freq = value
+        parser.values.tx_freq = value
+
+    if not parser.has_option('--freq'):
+        parser.add_option('-f', '--freq', type="eng_float",
+                          action="callback", callback=freq_callback,
+                          help="set Tx and/or Rx frequency to FREQ [default=%default]",
+                          metavar="FREQ")
+
+def add_options(parser, expert):
+    add_freq_option(parser)
+    usrp_options.add_rx_options(parser)
+    receive_path.receive_path.add_options(parser, expert)
+    expert.add_option("", "--rx-freq", type="eng_float", default=None,
+                          help="set Rx frequency to FREQ [default=%default]", metavar="FREQ")
+    parser.add_option("-v", "--verbose", action="store_true", default=False)
+
+class usrp_receive_path(gr.hier_block2):
+
+    def __init__(self, demod_class, rx_callback, options):
+        '''
+        See below for what options should hold
+        '''
+        gr.hier_block2.__init__(self, "usrp_receive_path",
+                gr.io_signature(0, 0, 0),                    # Input signature
+                gr.io_signature(0, 0, 0)) # Output signature
+        if options.rx_freq is None:
+            sys.stderr.write("-f FREQ or --freq FREQ or --rx-freq FREQ must be specified\n")
+            raise SystemExit
+        rx_path = receive_path.receive_path(demod_class, rx_callback, options)
+        for attr in dir(rx_path): #forward the methods
+            if not attr.startswith('_') and not hasattr(self, attr):
+                setattr(self, attr, getattr(rx_path, attr))
+        #setup usrp
+        self._demod_class = demod_class
+        self._setup_usrp_source(options)
+        #connect
+        self.connect(self.u, rx_path)
+
+    def _setup_usrp_source(self, options):
+        self.u = usrp_options.create_usrp_source(options)
+        adc_rate = self.u.adc_rate()
+        if options.verbose:
+            print 'USRP Source:', self.u
+        (self._bitrate, self._samples_per_symbol, self._decim) = \
+                        pick_rx_bitrate(options.bitrate, self._demod_class.bits_per_symbol(), \
+                                        options.samples_per_symbol, options.decim, adc_rate,  \
+                                        self.u.get_decim_rates())
+
+        self.u.set_decim(self._decim)
+
+        if not self.u.set_center_freq(options.rx_freq):
+            print "Failed to set Rx frequency to %s" % (eng_notation.num_to_str(options.rx_freq))
+            raise ValueError, eng_notation.num_to_str(options.rx_freq)