3 # Copyright 2007 Free Software Foundation, Inc.
5 # This file is part of GNU Radio
7 # GNU Radio is free software; you can redistribute it and/or modify
8 # it under the terms of the GNU General Public License as published by
9 # the Free Software Foundation; either version 3, or (at your option)
12 # GNU Radio is distributed in the hope that it will be useful,
13 # but WITHOUT ANY WARRANTY; without even the implied warranty of
14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 # GNU General Public License for more details.
17 # You should have received a copy of the GNU General Public License
18 # along with GNU Radio; see the file COPYING. If not, write to
19 # the Free Software Foundation, Inc., 51 Franklin Street,
20 # Boston, MA 02110-1301, USA.
25 from matplotlib.font_manager import fontManager, FontProperties
26 from optparse import OptionParser
28 matplotlib.interactive(True)
29 matplotlib.use('TkAgg')
31 class draw_constellation:
32 def __init__(self, filename, options):
33 self.hfile = open(filename, "r")
34 self.block_length = options.block
35 self.start = options.start
36 self.sample_rate = options.sample_rate
38 self.axis_font_size = 16
39 self.label_font_size = 18
40 self.title_font_size = 20
43 self.fig = figure(1, figsize=(16, 9), facecolor='w')
44 rcParams['xtick.labelsize'] = self.axis_font_size
45 rcParams['ytick.labelsize'] = self.axis_font_size
47 self.text_file = figtext(0.10, 0.95, ("File: %s" % filename), weight="heavy", size=16)
48 self.text_file_pos = figtext(0.10, 0.90, "File Position: ", weight="heavy", size=16)
49 self.text_block = figtext(0.40, 0.90, ("Block Size: %d" % self.block_length),
50 weight="heavy", size=16)
51 self.text_sr = figtext(0.60, 0.90, ("Sample Rate: %.2f" % self.sample_rate),
52 weight="heavy", size=16)
55 self.button_left_axes = self.fig.add_axes([0.45, 0.01, 0.05, 0.05], frameon=True)
56 self.button_left = Button(self.button_left_axes, "<")
57 self.button_left_callback = self.button_left.on_clicked(self.button_left_click)
59 self.button_right_axes = self.fig.add_axes([0.50, 0.01, 0.05, 0.05], frameon=True)
60 self.button_right = Button(self.button_right_axes, ">")
61 self.button_right_callback = self.button_right.on_clicked(self.button_right_click)
63 self.xlim = self.sp_iq.get_xlim()
65 self.manager = get_current_fig_manager()
66 connect('draw_event', self.zoom)
67 connect('key_press_event', self.click)
71 self.text_file_pos.set_text("File Position: %d" % (self.hfile.tell()//8))
72 iq = scipy.fromfile(self.hfile, dtype=scipy.complex64, count=self.block_length)
73 #print "Read in %d items" % len(iq)
77 self.reals = [r.real for r in iq]
78 self.imags = [i.imag for i in iq]
80 self.time = [i*(1/self.sample_rate) for i in range(len(self.reals))]
83 # if specified on the command-line, set file pointer
84 self.hfile.seek(16*self.start, 1)
88 # Subplot for real and imaginary parts of signal
89 self.sp_iq = self.fig.add_subplot(2,1,1, position=[0.075, 0.2, 0.4, 0.6])
90 self.sp_iq.set_title(("I&Q"), fontsize=self.title_font_size, fontweight="bold")
91 self.sp_iq.set_xlabel("Time (s)", fontsize=self.label_font_size, fontweight="bold")
92 self.sp_iq.set_ylabel("Amplitude (V)", fontsize=self.label_font_size, fontweight="bold")
93 self.plot_iq = plot(self.time, self.reals, 'bo-', self.time, self.imags, 'ro-')
94 self.sp_iq.axis([min(self.time), max(self.time),
95 1.5*min([min(self.reals), min(self.imags)]),
96 1.5*max([max(self.reals), max(self.imags)])])
98 # Subplot for constellation plot
99 self.sp_const = self.fig.add_subplot(2,2,1, position=[0.575, 0.2, 0.4, 0.6])
100 self.sp_const.set_title(("Constellation"), fontsize=self.title_font_size, fontweight="bold")
101 self.sp_const.set_xlabel("Inphase", fontsize=self.label_font_size, fontweight="bold")
102 self.sp_const.set_ylabel("Qaudrature", fontsize=self.label_font_size, fontweight="bold")
103 self.plot_const = plot(self.reals, self.imags, 'bo')
104 self.sp_const.axis([-2, 2, -2, 2])
108 def update_plots(self):
109 self.plot_iq[0].set_data([self.time, self.reals])
110 self.plot_iq[1].set_data([self.time, self.imags])
111 self.sp_iq.axis([min(self.time), max(self.time),
112 1.5*min([min(self.reals), min(self.imags)]),
113 1.5*max([max(self.reals), max(self.imags)])])
115 self.plot_const[0].set_data([self.reals, self.imags])
116 self.sp_const.axis([-2, 2, -2, 2])
119 def zoom(self, event):
120 newxlim = self.sp_iq.get_xlim()
121 if(newxlim != self.xlim):
123 r = self.reals[int(ceil(self.xlim[0])) : int(ceil(self.xlim[1]))]
124 i = self.imags[int(ceil(self.xlim[0])) : int(ceil(self.xlim[1]))]
126 self.plot_const[0].set_data(r, i)
127 self.sp_const.axis([-2, 2, -2, 2])
128 self.manager.canvas.draw()
131 def click(self, event):
132 forward_valid_keys = [" ", "down", "right"]
133 backward_valid_keys = ["up", "left"]
135 if(find(event.key, forward_valid_keys)):
138 elif(find(event.key, backward_valid_keys)):
141 def button_left_click(self, event):
144 def button_right_click(self, event):
147 def step_forward(self):
151 def step_backward(self):
152 # Step back in file position
153 if(self.hfile.tell() >= 16*self.block_length ):
154 self.hfile.seek(-16*self.block_length, 1)
156 self.hfile.seek(-self.hfile.tell(),1)
162 #FIXME: there must be a way to do this with a Python builtin
163 def find(item_in, list_search):
164 for l in list_search:
170 usage="%prog: [options] input_filename"
171 description = "Takes a GNU Radio complex binary file and displays the I&Q data versus time and the constellation plot (I vs. Q). You can set the block size to specify how many points to read in at a time and the start position in the file. By default, the system assumes a sample rate of 1, so in time, each sample is plotted versus the sample number. To set a true time axis, set the sample rate (-R or --sample-rate) to the sample rate used when capturing the samples."
173 parser = OptionParser(conflict_handler="resolve", usage=usage, description=description)
174 parser.add_option("-B", "--block", type="int", default=1000,
175 help="Specify the block size [default=%default]")
176 parser.add_option("-s", "--start", type="int", default=0,
177 help="Specify where to start in the file [default=%default]")
178 parser.add_option("-R", "--sample-rate", type="float", default=1.0,
179 help="Set the sampler rate of the data [default=%default]")
181 (options, args) = parser.parse_args ()
187 dc = draw_constellation(filename, options)
189 if __name__ == "__main__":
192 except KeyboardInterrupt: