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#
# 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, 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
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