+++ /dev/null
-#!/usr/bin/env python
-#
-# Copyright 2006,2007,2009 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 3, 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, usrp, optfir, eng_notation, pager
-from gnuradio.eng_option import eng_option
-from optparse import OptionParser
-import time, os, sys
-
-"""
-This example application demonstrates receiving and demodulating the
-FLEX pager protocol.
-
-The following are required command line parameters:
-
--f FREQ USRP receive frequency
-
-The following are optional command line parameters:
-
--R SUBDEV Daughter board specification, defaults to first found
--F FILE Read samples from a file instead of USRP.
--c FREQ Calibration offset. Gets added to receive frequency.
- Defaults to 0.0 Hz.
--g GAIN Daughterboard gain setting. Defaults to mid-range.
--l Log flow graph to files (LOTS of data)
--v Verbose output
-
-Once the program is running, ctrl-break (Ctrl-C) stops operation.
-"""
-
-class app_top_block(gr.top_block):
- def __init__(self, options, queue):
- gr.top_block.__init__(self, "usrp_flex")
- self.options = options
- self.offset = 0.0
- self.adj_time = time.time()
- self.verbose = options.verbose
-
- if options.from_file is None:
- # Set up USRP source with specified RX daughterboard
- self.src = usrp.source_c()
- if options.rx_subdev_spec == None:
- options.rx_subdev_spec = usrp.pick_rx_subdevice(self.src)
- self.subdev = usrp.selected_subdev(self.src, options.rx_subdev_spec)
- self.src.set_mux(usrp.determine_rx_mux_value(self.src, options.rx_subdev_spec))
-
- # Grab 250 KHz of spectrum (sample rate becomes 250 ksps complex)
- self.src.set_decim_rate(256)
-
- # If no gain specified, set to midrange
- if options.gain is None:
- g = self.subdev.gain_range()
- options.gain = (g[0]+g[1])/2.0
- self.subdev.set_gain(options.gain)
-
- # Tune daughterboard
- actual_frequency = options.frequency+options.calibration
- tune_result = usrp.tune(self.src, 0, self.subdev, actual_frequency)
- if not tune_result:
- sys.stderr.write("Failed to set center frequency to "+`actual_frequency`+"\n")
- sys.exit(1)
-
- if options.verbose:
- print "Using RX daughterboard", self.subdev.side_and_name()
- print "USRP gain is", options.gain
- print "USRP tuned to", actual_frequency
-
- else:
- # Use supplied file as source of samples
- self.src = gr.file_source(gr.sizeof_gr_complex, options.from_file)
- if options.verbose:
- print "Reading samples from", options.from_file
-
- if options.log and not options.from_file:
- usrp_sink = gr.file_sink(gr.sizeof_gr_complex, 'usrp.dat')
- self.connect(self.src, usrp_sink)
-
- # Set up 22KHz-wide bandpass about center frequency. Decimate by 10
- # to get channel rate of 25Ksps
- taps = optfir.low_pass(1.0, # Filter gain
- 250e3, # Sample rate
- 11000, # One-sided modulation bandwidth
- 12500, # One-sided channel bandwidth
- 0.1, # Passband ripple
- 60) # Stopband attenuation
-
- if options.verbose:
- print "Channel filter has", len(taps), "taps."
-
- self.chan = gr.freq_xlating_fir_filter_ccf(10, # Decimation rate
- taps, # Filter taps
- 0.0, # Offset frequency
- 250e3) # Sample rate
-
- if options.log:
- chan_sink = gr.file_sink(gr.sizeof_gr_complex, 'chan.dat')
- self.connect(self.chan, chan_sink)
-
- # FLEX protocol demodulator
- self.flex = pager.flex_demod(queue, options.frequency, options.verbose, options.log)
-
- self.connect(self.src, self.chan, self.flex)
-
- def freq_offset(self):
- return self.flex.dc_offset()*1600
-
- def adjust_freq(self):
- if time.time() - self.adj_time > 1.6: # Only do it once per FLEX frame
- self.adj_time = time.time()
- self.offset -= self.freq_offset()
- self.chan.set_center_freq(self.offset)
- if self.verbose:
- print "Channel frequency offset (Hz):", int(self.offset)
-
-def main():
- parser = OptionParser(option_class=eng_option)
- parser.add_option("-f", "--frequency", type="eng_float", default=None,
- help="set receive frequency to Hz", metavar="Hz")
- parser.add_option("-R", "--rx-subdev-spec", type="subdev",
- help="select USRP Rx side A or B", metavar="SUBDEV")
- parser.add_option("-c", "--calibration", type="eng_float", default=0.0,
- help="set frequency offset to Hz", metavar="Hz")
- parser.add_option("-g", "--gain", type="int", default=None,
- help="set RF gain", metavar="dB")
- parser.add_option("-l", "--log", action="store_true", default=False,
- help="log flowgraph to files (LOTS of data)")
- parser.add_option("-v", "--verbose", action="store_true", default=False,
- help="display debug output")
- parser.add_option("-F", "--from-file", default=None,
- help="read samples from file instead of USRP")
- (options, args) = parser.parse_args()
-
- if len(args) > 0 or (options.frequency == None and options.from_file == None):
- print "Run 'usrp_flex.py -h' for options."
- sys.exit(1)
-
- if options.frequency == None:
- options.frequency = 0.0
-
- # Flow graph emits pages into message queue
- queue = gr.msg_queue()
- tb = app_top_block(options, queue)
- runner = pager.queue_runner(queue)
-
- try:
- tb.run()
- except KeyboardInterrupt:
- pass
-
- runner.end()
-
-
-if __name__ == "__main__":
- main()
projects / debian / gnuradio / blobdiff