[Commit-gnuradio] r11195 - gnuradio/branches/developers/trondeau/digital/gnuradio-examples/python/digital

[trondeau]

Author: trondeau
Date: 2009-06-14 20:46:56 -0600 (Sun, 14 Jun 2009)
New Revision: 11195

Modified:
   
gnuradio/branches/developers/trondeau/digital/gnuradio-examples/python/digital/benchmark_tx.py
Log:
Doing same for TX: Adding USRP interface to benchmark_tx instead of residing in 
transmit_path (currently transmit_path_lb.py used instead).

Modified: 
gnuradio/branches/developers/trondeau/digital/gnuradio-examples/python/digital/benchmark_tx.py
===================================================================
--- 
gnuradio/branches/developers/trondeau/digital/gnuradio-examples/python/digital/benchmark_tx.py
      2009-06-15 02:40:10 UTC (rev 11194)
+++ 
gnuradio/branches/developers/trondeau/digital/gnuradio-examples/python/digital/benchmark_tx.py
      2009-06-15 02:46:56 UTC (rev 11195)
@@ -29,7 +29,7 @@
 import random, time, struct, sys
 
 # from current dir
-from transmit_path import transmit_path
+from transmit_path_lb import transmit_path
 
 #import os 
 #print os.getpid()
@@ -38,9 +38,128 @@
 class my_top_block(gr.top_block):
     def __init__(self, modulator, options):
         gr.top_block.__init__(self)
+
+        self._tx_freq            = options.tx_freq         # tranmitter's 
center frequency
+        self._tx_subdev_spec     = options.tx_subdev_spec  # daughterboard to 
use
+        self._interp             = options.interp          # interpolating 
rate for the USRP (prelim)
+
+        if self._tx_freq is None:
+            sys.stderr.write("-f FREQ or --freq FREQ or --tx-freq FREQ must be 
specified\n")
+            raise SystemExit
+
+        # Set up USRP sink; also adjusts interp, and bitrate
+        self._setup_usrp_sink()
+
+        # copy the final answers back into options for use by modulator
+        #options.bitrate = self._bitrate
+
         self.txpath = transmit_path(modulator, options)
-        self.connect(self.txpath)
 
+        self.connect(self.txpath, self.u)
+
+    def _setup_usrp_sink(self):
+        """
+        Creates a USRP sink, determines the settings for best bitrate,
+        and attaches to the transmitter's subdevice.
+        """
+        self.u = usrp.sink_c()
+
+        self.u.set_interp_rate(self._interp)
+
+        # determine the daughterboard subdevice we're using
+        if self._tx_subdev_spec is None:
+            self._tx_subdev_spec = usrp.pick_tx_subdevice(self.u)
+        self.u.set_mux(usrp.determine_tx_mux_value(self.u, 
self._tx_subdev_spec))
+        self.subdev = usrp.selected_subdev(self.u, self._tx_subdev_spec)
+
+        # Set center frequency of USRP
+        ok = self.set_freq(self._tx_freq)
+        if not ok:
+            print "Failed to set Tx frequency to %s" % 
(eng_notation.num_to_str(self._tx_freq),)
+            raise ValueError
+
+        # Set the USRP for maximum transmit gain
+        # (Note that on the RFX cards this is a nop.)
+        self.set_gain(self.subdev.gain_range()[1])
+
+        # enable Auto Transmit/Receive switching
+        self.set_auto_tr(True)
+
+    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(self.subdev.which(), self.subdev, target_freq)
+        if r:
+            return True
+
+        return False
+        
+    def set_gain(self, gain):
+        """
+        Sets the analog gain in the USRP
+        """
+        self.gain = gain
+        self.subdev.set_gain(gain)
+
+    def set_auto_tr(self, enable):
+        """
+        Turns on auto transmit/receive of USRP daughterboard (if exits; else 
ignored)
+        """
+        return self.subdev.set_auto_tr(enable)
+        
+    def interp(self):
+        return self._interp
+
+    def add_options(normal, expert):
+        """
+        Adds usrp-specific options to the Options Parser
+        """
+        add_freq_option(normal)
+        normal.add_option("-T", "--tx-subdev-spec", type="subdev", 
default=None,
+                          help="select USRP Tx side A or B")
+        normal.add_option("-v", "--verbose", action="store_true", 
default=False)
+
+        expert.add_option("", "--tx-freq", type="eng_float", default=None,
+                          help="set transmit frequency to FREQ 
[default=%default]", metavar="FREQ")
+        expert.add_option("-i", "--interp", type="intx", default=256,
+                          help="set fpga interpolation rate to INTERP 
[default=%default]")
+    # Make a static method to call before instantiation
+    add_options = staticmethod(add_options)
+
+    def _print_verbage(self):
+        """
+        Prints information about the transmit path
+        """
+        print "Using TX d'board %s"    % (self.subdev.side_and_name(),)
+        print "modulation:      %s"    % (self._modulator_class.__name__)
+        print "interp:          %3d"   % (self._interp)
+        print "Tx Frequency:    %s"    % 
(eng_notation.num_to_str(self._tx_freq))
+        
+
+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
 # /////////////////////////////////////////////////////////////////////////////
@@ -72,6 +191,7 @@
     parser.add_option("","--from-file", default=None,
                       help="use file for packet contents")
 
+    my_top_block.add_options(parser, expert_grp)
     transmit_path.add_options(parser, expert_grp)
 
     for mod in mods.values():