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Diffstat (limited to 'gnuradio-examples/python/gmsk2/receive_path.py')
| -rw-r--r-- | gnuradio-examples/python/gmsk2/receive_path.py | 150 |
1 files changed, 0 insertions, 150 deletions
diff --git a/gnuradio-examples/python/gmsk2/receive_path.py b/gnuradio-examples/python/gmsk2/receive_path.py deleted file mode 100644 index c2eba7b764..0000000000 --- a/gnuradio-examples/python/gmsk2/receive_path.py +++ /dev/null @@ -1,150 +0,0 @@ -#!/usr/bin/env python -# -# 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_rx_bitrate - -# ///////////////////////////////////////////////////////////////////////////// -# receive path -# ///////////////////////////////////////////////////////////////////////////// - -class receive_path(gr.hier_block): - def __init__(self, fg, demod_class, rx_subdev_spec, - bitrate, decim, spb, - rx_callback, options, demod_kwargs): - - self.u = usrp.source_c (fusb_block_size=options.fusb_block_size, - fusb_nblocks=options.fusb_nblocks) - adc_rate = self.u.adc_rate() - - (self._bitrate, self._spb, self._decim) = \ - pick_rx_bitrate(bitrate, demod_class.bits_per_baud(), spb, decim, adc_rate) - - self.u.set_decim_rate(self._decim) - sw_decim = 1 - - if rx_subdev_spec is None: - rx_subdev_spec = usrp.pick_rx_subdevice(self.u) - self.subdev = usrp.selected_subdev(self.u, rx_subdev_spec) - print "Using RX d'board %s" % (self.subdev.side_and_name(),) - - self.u.set_mux(usrp.determine_rx_mux_value(self.u, rx_subdev_spec)) - - # Create filter to get actual channel we want - chan_coeffs = gr.firdes.low_pass (1.0, # gain - sw_decim * self._spb, # sampling rate - 1.0, # midpoint of trans. band - 0.1, # width of trans. band - gr.firdes.WIN_HANN) # filter type - - print "len(rx_chan_coeffs) =", len(chan_coeffs) - - # Decimating Channel filter - # complex in and out, float taps - self.chan_filt = gr.fft_filter_ccc(sw_decim, chan_coeffs) - #self.chan_filt = gr.fir_filter_ccf(sw_decim, chan_coeffs) - - # receiver - self.packet_receiver = \ - blks.demod_pkts(fg, - demod_class(fg, spb=self._spb, **demod_kwargs), - access_code=None, - callback=rx_callback, - threshold=-1) - - fg.connect(self.u, self.chan_filt, self.packet_receiver) - gr.hier_block.__init__(self, fg, None, None) - - g = self.subdev.gain_range() - #self.set_gain((g[0] + g[1])/2) # set gain to midpoint - self.set_gain(g[1]) # set gain to max - self.set_auto_tr(True) # enable Auto Transmit/Receive switching - - # Carrier Sensing Blocks - alpha = 0.001 - thresh = 30 # in dB, will have to adjust - self.probe = gr.probe_avg_mag_sqrd_c(thresh,alpha) - fg.connect(self.chan_filt, self.probe) - - 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(0, self.subdev, target_freq) - if r: - return True - - return False - - def set_gain(self, gain): - if gain is None: - r = self.subdev.gain_range() - gain = (r[0] + r[1])/2 # set gain to midpoint - self.gain = gain - return self.subdev.set_gain(gain) - - def set_auto_tr(self, enable): - return self.subdev.set_auto_tr(enable) - - def bitrate(self): - return self._bitrate - - def spb(self): - return self._spb - - def decim(self): - return self._decim - - - def carrier_sensed(self): - """ - Return True if we think carrier is present. - """ - #return self.probe.level() > X - return self.probe.unmuted() - - def carrier_threshold(self): - """ - Return current setting in dB. - """ - return self.probe.threshold() - - def set_carrier_threshold(self, threshold_in_db): - """ - Set carrier threshold. - - @param threshold_in_db: set detection threshold - @type threshold_in_db: float (dB) - """ - self.probe.set_threshold(threshold_in_db) - |