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#!/usr/bin/env python
#
# Copyright 2007 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, usrp
from gnuradio import eng_notation
n2s = eng_notation.num_to_str
FR_MODE = usrp.FR_USER_0
bmFR_MODE_RESET = 1 << 0 # bit 0: active high reset
bmFR_MODE_TX = 1 << 1 # bit 1: enable transmitter
bmFR_MODE_RX = 1 << 2 # bit 2: enable receiver
bmFR_MODE_LP = 1 << 3 # bit 3: enable digital loopback
FR_DEGREE = usrp.FR_USER_1
FR_AMPL = usrp.FR_USER_2
def pick_subdevice(u):
"""
The user didn't specify a subdevice on the command line.
If there's a daughterboard on A, select A.
If there's a daughterboard on B, select B.
Otherwise, select A.
"""
if u.db[0][0].dbid() >= 0: # dbid is < 0 if there's no d'board or a problem
return (0, 0)
if u.db[1][0].dbid() >= 0:
return (1, 0)
return (0, 0)
class sounder_tx:
def __init__(self, loopback=False,ampl=4096,verbose=False,debug=False):
self._loopback=loopback
self._amplitude = ampl
self._verbose = verbose
self._debug = debug
self._u = usrp.sink_s(fpga_filename='usrp_sounder.rbf')
if not self._loopback:
self._subdev_spec = usrp.pick_tx_subdevice(self._u)
self._subdev = usrp.selected_subdev(self._u, self._subdev_spec)
if self._verbose:
print "Using", self._subdev.name(), "for sounder transmitter."
self.set_amplitude(ampl)
self._subdev.set_lo_offset(0.0)
self._u.start()
self._subdev.set_enable(True)
def tune(self, frequency):
if self._verbose:
print "Setting transmitter frequency to", n2s(frequency)
result = self._u.tune(0, self._subdev, frequency)
if result == False:
raise RuntimeError("Failed to set transmitter frequency.")
def set_amplitude(self, ampl):
self._amplitude = ampl
if self._debug:
print "Writing amplitude register with:", hex(self._mode)
self._u._write_fpga_reg(FR_AMPL, self._amplitude)
class sounder_rx:
def __init__(self,subdev_spec=None,gain=None,length=1,alpha=1.0,msgq=None,loopback=False,verbose=False,debug=False):
self._subdev_spec = subdev_spec
self._gain = gain
self._length = length
self._alpha = alpha
self._msgq = msgq
self._loopback = loopback
self._verbose = verbose
self._debug = debug
self._fg = gr.flow_graph()
self._u = usrp.source_c(fpga_filename='usrp_sounder.rbf')
if not self._loopback:
if self._subdev_spec == None:
self._subdev_spec = pick_subdevice(self._u)
self._u.set_mux(usrp.determine_rx_mux_value(self._u, self._subdev_spec))
self._subdev = usrp.selected_subdev(self._u, self._subdev_spec)
if self._verbose:
print "Using", self._subdev.name(), "for sounder receiver."
self.set_gain(self._gain)
self._vblen = gr.sizeof_gr_complex*self._length
if self._debug:
print "Generating impulse vectors of length", self._length, "byte length", self._vblen
self._s2v = gr.stream_to_vector(gr.sizeof_gr_complex, self._length)
if self._verbose:
print "Using smoothing alpha of", self._alpha
self._lpf = gr.single_pole_iir_filter_cc(self._alpha, self._length)
self._sink = gr.message_sink(self._vblen, self._msgq, True)
self._fg.connect(self._u, self._s2v, self._lpf, self._sink)
def tune(self, frequency):
if self._verbose:
print "Setting receiver frequency to", n2s(frequency)
result = self._u.tune(0, self._subdev, frequency)
if result == False:
raise RuntimeError("Failed to set receiver frequency.")
def set_gain(self, gain):
self._gain = gain
if self._loopback:
return
if self._gain is None:
# if no gain was specified, use the mid-point in dB
g = self._subdev.gain_range()
self._gain = float(g[0]+g[1])/2
if self._verbose:
print "Setting receiver gain to", gain
self._subdev.set_gain(self._gain)
def start(self):
if self._debug:
print "Starting receiver flow graph."
self._fg.start()
def wait(self):
if self._debug:
print "Waiting for threads..."
self._fg.wait()
def stop(self):
if self._debug:
print "Stopping receiver flow graph."
self._fg.stop()
self.wait()
if self._debug:
print "Receiver flow graph stopped."
class sounder:
def __init__(self,transmit=False,receive=False,loopback=False,rx_subdev_spec=None,ampl=0x1FFF,
frequency=0.0,rx_gain=None,degree=12,length=1,alpha=1.0,msgq=None,verbose=False,debug=False):
self._transmit = transmit
self._receive = receive
self._loopback = loopback
self._rx_subdev_spec = rx_subdev_spec
self._frequency = frequency
self._amplitude = ampl
self._rx_gain = rx_gain
self._degree = degree
self._length = length
self._alpha = alpha
self._msgq = msgq
self._verbose = verbose
self._debug = debug
self._mode = 0
self._u = None
self._trans = None
self._rcvr = None
self._transmitting = False
self._receiving = False
if self._transmit:
self._trans = sounder_tx(loopback=self._loopback,ampl=self._amplitude,
verbose=self._verbose)
self._u = self._trans._u
if self._receive:
self._rcvr = sounder_rx(subdev_spec=self._rx_subdev_spec,length=self._length,
gain=self._rx_gain,alpha=self._alpha,msgq=self._msgq,
loopback=self._loopback,verbose=self._verbose,
debug=self._debug)
self._u = self._rcvr._u # either receiver or transmitter object will do
self.set_reset(True)
if self._loopback == False:
self.tune(self._frequency)
self.set_degree(self._degree)
self.set_loopback(self._loopback)
self.set_reset(False)
def tune(self, frequency):
self._frequency = frequency
if self._rcvr:
self._rcvr.tune(frequency)
if self._trans:
self._trans.tune(frequency)
def set_degree(self, degree):
if self._verbose:
print "Setting PN code degree to", degree
self._u._write_fpga_reg(FR_DEGREE, degree);
def _write_mode(self):
if self._debug:
print "Writing mode register with:", hex(self._mode)
self._u._write_fpga_reg(FR_MODE, self._mode)
def enable_tx(self, value):
if value:
if self._verbose:
print "Enabling transmitter."
self._mode |= bmFR_MODE_TX
self._transmitting = True
else:
if self._verbose:
print "Disabling transmitter."
self._mode &= ~bmFR_MODE_TX
self._write_mode()
def enable_rx(self, value):
if value:
self._mode |= bmFR_MODE_RX
self._write_mode()
self._rcvr.start()
self._receiving = True
else:
self._rcvr.stop()
self._mode &= ~bmFR_MODE_RX
self._write_mode()
self._receiving = False
def set_loopback(self, value):
if value:
if self._verbose:
print "Enabling digital loopback."
self._mode |= bmFR_MODE_LP
else:
if self._verbose:
print "Disabling digital loopback."
self._mode &= ~bmFR_MODE_LP
self._write_mode()
def set_reset(self, value):
if value:
if self._debug:
print "Asserting reset."
self._mode |= bmFR_MODE_RESET
else:
if self._debug:
print "De-asserting reset."
self._mode &= ~bmFR_MODE_RESET
self._write_mode()
def start(self):
if self._transmit:
self.enable_tx(True)
if self._receive:
self.enable_rx(True)
def __del__(self):
if self._transmitting:
self.enable_tx(False)
if self._receiving:
self.enable_rx(False)
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