X-Git-Url: https://git.gag.com/?a=blobdiff_plain;f=gr-msdd6000%2Fsrc%2Fpython-examples%2Fmsdd_spectrum_sense.py;fp=gr-msdd6000%2Fsrc%2Fpython-examples%2Fmsdd_spectrum_sense.py;h=e3d182b03c261b2e032a540c56cd2319524796c1;hb=8a9ddbb0675f9bfcc6e03b457fba6c79474a3693;hp=0000000000000000000000000000000000000000;hpb=82d471b9b4a8b389b5da44b19c69c36420828382;p=debian%2Fgnuradio

diff --git a/gr-msdd6000/src/python-examples/msdd_spectrum_sense.py b/gr-msdd6000/src/python-examples/msdd_spectrum_sense.py
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+++ b/gr-msdd6000/src/python-examples/msdd_spectrum_sense.py
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+#!/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