diff options
Diffstat (limited to 'gr-msdd6000/src/python-examples/msdd_spectrum_sense.py')
| -rwxr-xr-x | gr-msdd6000/src/python-examples/msdd_spectrum_sense.py | 296 |
1 files changed, 0 insertions, 296 deletions
diff --git a/gr-msdd6000/src/python-examples/msdd_spectrum_sense.py b/gr-msdd6000/src/python-examples/msdd_spectrum_sense.py deleted file mode 100755 index e3d182b03..000000000 --- a/gr-msdd6000/src/python-examples/msdd_spectrum_sense.py +++ /dev/null @@ -1,296 +0,0 @@ -#!/usr/bin/env python -# -# Copyright 2008 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, eng_notation, optfir, window -from gnuradio import msdd -from gnuradio.eng_option import eng_option -from optparse import OptionParser -import sys -import math -import struct -from pylab import * -from numpy import array -import time - -matplotlib.interactive(True) -matplotlib.use('TkAgg') - -class tune(gr.feval_dd): - """ - This class allows C++ code to callback into python. - """ - def __init__(self, tb): - gr.feval_dd.__init__(self) - self.tb = tb - - def eval(self, ignore): - """ - This method is called from gr.bin_statistics_f when it wants to change - the center frequency. This method tunes the front end to the new center - frequency, and returns the new frequency as its result. - """ - try: - # We use this try block so that if something goes wrong from here - # down, at least we'll have a prayer of knowing what went wrong. - # Without this, you get a very mysterious: - # - # terminate called after throwing an instance of 'Swig::DirectorMethodException' - # Aborted - # - # message on stderr. Not exactly helpful ;) - - new_freq = self.tb.set_next_freq() - return new_freq - - except Exception, e: - print "tune: Exception: ", e - - -class parse_msg(object): - def __init__(self, sample_rate, percent, alpha=0.01): - self.axis_font_size = 16 - self.label_font_size = 18 - self.title_font_size = 20 - self.text_size = 22 - - self.fig = figure(1, facecolor="w", figsize=(12,9)) - self.sp = self.fig.add_subplot(1,1,1) - self.pl = self.sp.plot(range(100), 100*[1,]) - - params = {'backend': 'ps', - 'xtick.labelsize': self.axis_font_size, - 'ytick.labelsize': self.axis_font_size, - 'text.usetex': False} - rcParams.update(params) - - self.sp.set_title(("FFT"), fontsize=self.title_font_size, fontweight="bold") - self.sp.set_xlabel("Frequency (Hz)", fontsize=self.label_font_size, fontweight="bold") - self.sp.set_ylabel("Magnitude (dB)", fontsize=self.label_font_size, fontweight="bold") - self.text_alpha = figtext(0.10, 0.94, ('Moving average alpha: %s' % alpha), weight="heavy", size=self.text_size) - - self.cfreqs = list() - self.freqrange = list() - self.data = list() #array('f') - - self.alpha = alpha - - self.index = 0 - self.full = False - self.last_cfreq = 0 - - self.sample_rate = sample_rate - self.percent = (1.0-percent)/2.0 - - def parse(self, msg): - self.center_freq = msg.arg1() - self.vlen = int(msg.arg2()) - assert(msg.length() == self.vlen * gr.sizeof_float) - - - if(self.center_freq < self.last_cfreq): - print "Plotting spectrum\n" - self.full = True - - self.pl[0].set_data([self.freqrange, self.data]) - self.sp.set_ylim([min(self.data), max(self.data)]) - self.sp.set_xlim([min(self.freqrange), max(self.freqrange)]) - draw() - - self.index = 0 - del self.freqrange - self.freqrange = list() - #raw_input() - - self.last_cfreq = self.center_freq - - startind = int(self.percent * self.vlen) - endind = int((1.0 - self.percent) * self.vlen) - - fstep = self.sample_rate / self.vlen - f = [self.center_freq - self.sample_rate/2.0 + i*fstep for i in range(startind, endind)] - self.freqrange += f - - t = msg.to_string() - d = struct.unpack('%df' % (self.vlen,), t) - - if self.full: - for i in range(startind, endind): - self.data[self.index] = (1.0-self.alpha)*self.data[self.index] + (self.alpha)*d[i] - self.index += 1 - else: - self.data += [di for di in d[startind:endind]] - - -class my_top_block(gr.top_block): - - def __init__(self): - gr.top_block.__init__(self) - - usage = "usage: %prog [options] host min_freq max_freq" - parser = OptionParser(option_class=eng_option, usage=usage) - parser.add_option("-g", "--gain", type="eng_float", default=None, - help="set gain in dB (default is midpoint)") - parser.add_option("", "--tune-delay", type="eng_float", default=5e-5, metavar="SECS", - help="time to delay (in seconds) after changing frequency [default=%default]") - parser.add_option("", "--dwell-delay", type="eng_float", default=50e-5, metavar="SECS", - help="time to dwell (in seconds) at a given frequncy [default=%default]") - parser.add_option("-F", "--fft-size", type="int", default=256, - help="specify number of FFT bins [default=%default]") - parser.add_option("-d", "--decim", type="intx", default=16, - help="set decimation to DECIM [default=%default]") - parser.add_option("", "--real-time", action="store_true", default=False, - help="Attempt to enable real-time scheduling") - - (options, args) = parser.parse_args() - if len(args) != 3: - parser.print_help() - sys.exit(1) - - self.address = args[0] - self.min_freq = eng_notation.str_to_num(args[1]) - self.max_freq = eng_notation.str_to_num(args[2]) - - self.decim = options.decim - self.gain = options.gain - - if self.min_freq > self.max_freq: - self.min_freq, self.max_freq = self.max_freq, self.min_freq # swap them - - self.fft_size = options.fft_size - - if not options.real_time: - realtime = False - else: - # Attempt to enable realtime scheduling - r = gr.enable_realtime_scheduling() - if r == gr.RT_OK: - realtime = True - else: - realtime = False - print "Note: failed to enable realtime scheduling" - - adc_rate = 102.4e6 - self.int_rate = adc_rate / self.decim - print "Sampling rate: ", self.int_rate - - # build graph - self.port = 10001 - self.src = msdd.source_simple(self.address, self.port) - self.src.set_decim_rate(self.decim) - - self.set_gain(self.gain) - self.set_freq(self.min_freq) - - s2v = gr.stream_to_vector(gr.sizeof_gr_complex, self.fft_size) - - mywindow = window.blackmanharris(self.fft_size) - fft = gr.fft_vcc(self.fft_size, True, mywindow, True) - power = 0 - for tap in mywindow: - power += tap*tap - - norm = gr.multiply_const_cc(1.0/self.fft_size) - c2mag = gr.complex_to_mag_squared(self.fft_size) - - # FIXME the log10 primitive is dog slow - log = gr.nlog10_ff(10, self.fft_size, - -20*math.log10(self.fft_size)-10*math.log10(power/self.fft_size)) - - # Set the freq_step to % of the actual data throughput. - # This allows us to discard the bins on both ends of the spectrum. - self.percent = 0.4 - - self.freq_step = self.percent * self.int_rate - self.min_center_freq = self.min_freq + self.freq_step/2 - nsteps = math.ceil((self.max_freq - self.min_freq) / self.freq_step) - self.max_center_freq = self.min_center_freq + (nsteps * self.freq_step) - - self.next_freq = self.min_center_freq - - tune_delay = max(0, int(round(options.tune_delay * self.int_rate / self.fft_size))) # in fft_frames - dwell_delay = max(1, int(round(options.dwell_delay * self.int_rate / self.fft_size))) # in fft_frames - - self.msgq = gr.msg_queue(16) - self._tune_callback = tune(self) # hang on to this to keep it from being GC'd - stats = gr.bin_statistics_f(self.fft_size, self.msgq, - self._tune_callback, tune_delay, dwell_delay) - - # FIXME leave out the log10 until we speed it up - self.connect(self.src, s2v, fft, c2mag, log, stats) - - - def set_next_freq(self): - target_freq = self.next_freq - self.next_freq = self.next_freq + self.freq_step - if self.next_freq >= self.max_center_freq: - self.next_freq = self.min_center_freq - - if not self.set_freq(target_freq): - print "Failed to set frequency to", target_freq - - return target_freq - - - def set_freq(self, target_freq): - """ - Set the center frequency we're interested in. - - @param target_freq: frequency in Hz - @rypte: bool - - """ - return self.src.set_rx_freq(0, target_freq) - - - def set_gain(self, gain): - self.src.set_pga(0, gain) - - -def main_loop(tb): - msgparser = parse_msg(tb.int_rate, tb.percent) - - while 1: - - # Get the next message sent from the C++ code (blocking call). - # It contains the center frequency and the mag squared of the fft - msgparser.parse(tb.msgq.delete_head()) - - # Print center freq so we know that something is happening... - print msgparser.center_freq - - # FIXME do something useful with the data... - - # m.data are the mag_squared of the fft output (they are in the - # standard order. I.e., bin 0 == DC.) - # You'll probably want to do the equivalent of "fftshift" on them - # m.raw_data is a string that contains the binary floats. - # You could write this as binary to a file. - - -if __name__ == '__main__': - tb = my_top_block() - try: - tb.start() # start executing flow graph in another thread... - main_loop(tb) - - except KeyboardInterrupt: - pass |