1 files changed, 108 insertions, 0 deletions
diff --git a/gnuradio-examples/python/gmsk2/transmit_path.py b/gnuradio-examples/python/gmsk2/transmit_path.py
new file mode 100644
index 000000000..a1df1579f
--- /dev/null
+++ b/gnuradio-examples/python/gmsk2/transmit_path.py
@@ -0,0 +1,108 @@
+#
+# 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., 59 Temple Place - Suite 330,
+# Boston, MA 02111-1307, USA.
+# 
+
+from gnuradio import gr, gru, blks
+from gnuradio import usrp
+
+# from current dir
+from pick_bitrate import pick_tx_bitrate
+
+# /////////////////////////////////////////////////////////////////////////////
+#                              transmit path
+# /////////////////////////////////////////////////////////////////////////////
+
+class transmit_path(gr.hier_block): 
+    def __init__(self, fg, mod_class, tx_subdev_spec,
+                 bitrate, interp, spb, gain,
+                 options, mod_kwargs):
+
+        self.normal_gain = gain
+
+        self.u = usrp.sink_c (fusb_block_size=options.fusb_block_size,
+                              fusb_nblocks=options.fusb_nblocks)
+        dac_rate = self.u.dac_rate();
+
+        print mod_class
+        print mod_class.bits_per_baud()
+        (self._bitrate, self._spb, self._interp) = \
+            pick_tx_bitrate(bitrate, mod_class.bits_per_baud(), spb, interp, dac_rate)
+
+        self.u.set_interp_rate(self._interp)
+
+        # determine the daughterboard subdevice we're using
+        if tx_subdev_spec is None:
+            tx_subdev_spec = usrp.pick_tx_subdevice(self.u)
+        self.u.set_mux(usrp.determine_tx_mux_value(self.u, tx_subdev_spec))
+        self.subdev = usrp.selected_subdev(self.u, tx_subdev_spec)
+        print "Using TX d'board %s" % (self.subdev.side_and_name(),)
+
+        # transmitter
+        self.packet_transmitter = \
+            blks.mod_pkts(fg,
+                          mod_class(fg, spb=self._spb, **mod_kwargs),
+                          access_code=None,
+                          msgq_limit=4,
+                          pad_for_usrp=True)
+
+        self.amp = gr.multiply_const_cc (self.normal_gain)
+
+        fg.connect(self.packet_transmitter, self.amp, self.u)
+        gr.hier_block.__init__(self, fg, None, None)
+
+        self.set_gain(self.subdev.gain_range()[1])  # set max Tx gain
+        self.set_auto_tr(True)                      # enable Auto Transmit/Receive switching
+
+    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):
+        self.gain = gain
+        self.subdev.set_gain(gain)
+
+    def set_auto_tr(self, enable):
+        return self.subdev.set_auto_tr(enable)
+        
+    def send_pkt(self, payload='', eof=False):
+        return self.packet_transmitter.send_pkt(payload, eof)
+        
+    def bitrate(self):
+        return self._bitrate
+
+    def spb(self):
+        return self._spb
+
+    def interp(self):
+        return self._interp