[Commit-gnuradio] r4525 - gnuradio/branches/developers/n4hy/ofdm2/gnuradio-examples/python/ofdm

[trondeau]

Author: trondeau
Date: 2007-02-19 15:52:08 -0700 (Mon, 19 Feb 2007)
New Revision: 4525

Added:
   
gnuradio/branches/developers/n4hy/ofdm2/gnuradio-examples/python/ofdm/benchmark_ofdm_rx.py
Log:
adding ofdm receive with USRP

Added: 
gnuradio/branches/developers/n4hy/ofdm2/gnuradio-examples/python/ofdm/benchmark_ofdm_rx.py
===================================================================
--- 
gnuradio/branches/developers/n4hy/ofdm2/gnuradio-examples/python/ofdm/benchmark_ofdm_rx.py
                          (rev 0)
+++ 
gnuradio/branches/developers/n4hy/ofdm2/gnuradio-examples/python/ofdm/benchmark_ofdm_rx.py
  2007-02-19 22:52:08 UTC (rev 4525)
@@ -0,0 +1,212 @@
+#!/usr/bin/env python
+#
+# Copyright 2005, 2006 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.
+# 
+
+from gnuradio import gr, gru, modulation_utils
+from gnuradio import usrp
+from gnuradio import eng_notation
+from gnuradio.eng_option import eng_option
+from optparse import OptionParser
+
+import random, time, struct, sys, math
+
+# from current dir
+from receive_path import receive_path
+import ofdm, fusb_options
+
+class usrp_graph(gr.flow_graph):
+    def __init__(self, callback, options):
+        gr.flow_graph.__init__(self)
+
+        self._rx_freq            = options.rx_freq         # receiver's center 
frequency
+        self._rx_gain            = options.rx_gain         # receiver's gain
+        self._rx_subdev_spec     = options.rx_subdev_spec  # daughterboard to 
use
+        self._decim              = options.decim           # Decimating rate 
for the USRP (prelim)
+        self._fusb_block_size    = options.fusb_block_size # usb info for USRP
+        self._fusb_nblocks       = options.fusb_nblocks    # usb info for USRP
+
+        if self._rx_freq is None:
+            sys.stderr.write("-f FREQ or --freq FREQ or --rx-freq FREQ must be 
specified\n")
+            raise SystemExit
+
+        # Set up USRP source
+        self._setup_usrp_source()
+        ok = self.set_freq(self._rx_freq)
+        if not ok:
+            print "Failed to set Rx frequency to %s" % 
(eng_notation.num_to_str(self._rx_freq))
+            raise ValueError, eng_notation.num_to_str(self._rx_freq)
+        g = self.subdev.gain_range()
+        if options.show_rx_gain_range:
+            print "Rx Gain Range: minimum = %g, maximum = %g, step size = %g" \
+                  % (g[0], g[1], g[2])
+        self.set_gain(options.rx_gain)
+        self.set_auto_tr(True)                 # enable Auto Transmit/Receive 
switching
+
+        # Set up receive path
+        self.rxpath = receive_path(self, callback, options)
+
+        self.connect(self.u, self.rxpath)
+
+    def _setup_usrp_source(self):
+        self.u = usrp.source_c (fusb_block_size=self._fusb_block_size,
+                                fusb_nblocks=self._fusb_nblocks)
+        adc_rate = self.u.adc_rate()
+
+        self.u.set_decim_rate(self._decim)
+
+        # determine the daughterboard subdevice we're using
+        if self._rx_subdev_spec is None:
+            self._rx_subdev_spec = usrp.pick_rx_subdevice(self.u)
+        self.subdev = usrp.selected_subdev(self.u, self._rx_subdev_spec)
+
+        self.u.set_mux(usrp.determine_rx_mux_value(self.u, 
self._rx_subdev_spec))
+
+    def set_freq(self, target_freq):
+        """
+        Set the center frequency we're interested in.
+
+        @param target_freq: frequency in Hz
+        @rypte: bool
+
+        Tuning is a two step process.  First we ask the front-end to
+        tune as close to the desired frequency as it can.  Then we use
+        the result of that operation and our target_frequency to
+        determine the value for the digital up converter.
+        """
+        r = self.u.tune(0, self.subdev, target_freq)
+        if r:
+            return True
+
+        return False
+
+    def set_gain(self, gain):
+        """
+        Sets the analog gain in the USRP
+        """
+        if gain is None:
+            r = self.subdev.gain_range()
+            gain = (r[0] + r[1])/2               # set gain to midpoint
+        self.gain = gain
+        return self.subdev.set_gain(gain)
+
+    def set_auto_tr(self, enable):
+        return self.subdev.set_auto_tr(enable)
+
+    def decim(self):
+        return self._decim
+
+    def add_options(normal, expert):
+        """
+        Adds usrp-specific options to the Options Parser
+        """
+        add_freq_option(normal)
+        if not normal.has_option("--bitrate"):
+            normal.add_option("-r", "--bitrate", type="eng_float", 
default=None,
+                              help="specify bitrate.  samples-per-symbol and 
interp/decim will be derived.")
+        normal.add_option("-R", "--rx-subdev-spec", type="subdev", 
default=None,
+                          help="select USRP Rx side A or B")
+        normal.add_option("", "--rx-gain", type="eng_float", default=None, 
metavar="GAIN",
+                          help="set receiver gain in dB [default=midpoint].  
See also --show-rx-gain-range")
+        normal.add_option("", "--show-rx-gain-range", action="store_true", 
default=False, 
+                          help="print min and max Rx gain available on 
selected daughterboard")
+        normal.add_option("-v", "--verbose", action="store_true", 
default=False)
+
+        expert.add_option("-S", "--samples-per-symbol", type="int", 
default=None,
+                          help="set samples/symbol [default=%default]")
+        expert.add_option("", "--rx-freq", type="eng_float", default=None,
+                          help="set Rx frequency to FREQ [default=%default]", 
metavar="FREQ")
+        expert.add_option("-d", "--decim", type="intx", default=32,
+                          help="set fpga decimation rate to DECIM 
[default=%default]")
+        expert.add_option("", "--snr", type="eng_float", default=30,
+                          help="set the SNR of the channel in dB 
[default=%default]")
+   
+
+    # Make a static method to call before instantiation
+    add_options = staticmethod(add_options)
+
+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")
+
+# /////////////////////////////////////////////////////////////////////////////
+#                                   main
+# /////////////////////////////////////////////////////////////////////////////
+
+def main():
+
+    global n_rcvd, n_right
+        
+    n_rcvd = 0
+    n_right = 0
+
+    def rx_callback(ok, payload):
+        global n_rcvd, n_right
+        n_rcvd += 1
+        if ok:
+            n_right += 1
+        print "ok: %r \t n_rcvd: %d \t n_right: %d" % (ok, n_rcvd, n_right)
+
+    parser = OptionParser(option_class=eng_option, conflict_handler="resolve")
+    expert_grp = parser.add_option_group("Expert")
+    parser.add_option("-s", "--size", type="eng_float", default=1450,
+                      help="set packet size [default=%default]")
+    parser.add_option("-M", "--megabytes", type="eng_float", default=1.0,
+                      help="set megabytes to transmit [default=%default]")
+    parser.add_option("-r", "--sample-rate", type="eng_float", default=1e5,
+                      help="set sample rate to RATE (%default)") 
+
+    usrp_graph.add_options(parser, expert_grp)
+    receive_path.add_options(parser, expert_grp)
+    ofdm.ofdm_mod.add_options(parser, expert_grp)
+    fusb_options.add_options(expert_grp)
+
+    (options, args) = parser.parse_args ()
+
+    if(options.mtu < options.size):
+        sys.stderr.write("MTU (%.0f) must be larger than the packet size 
(%.0f)\n"
+                         % (options.mtu, options.size))
+        sys.exit(1)
+
+    # build the graph
+    fg = usrp_graph(rx_callback, options)
+
+    r = gr.enable_realtime_scheduling()
+    if r != gr.RT_OK:
+        print "Warning: failed to enable realtime scheduling"
+
+    fg.start()                      # start flow graph
+    fg.wait()                       # wait for it to finish
+
+if __name__ == '__main__':
+    try:
+        main()
+    except KeyboardInterrupt:
+        pass


Property changes on: 
gnuradio/branches/developers/n4hy/ofdm2/gnuradio-examples/python/ofdm/benchmark_ofdm_rx.py
___________________________________________________________________
Name: svn:executable
   + *