3 # Copyright 2007,2008 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.
26 print "Please install SciPy to run this script (http://www.scipy.org/)"
31 from matplotlib.font_manager import fontManager, FontProperties
33 print "Please install Matplotlib to run this script (http://matplotlib.sourceforge.net/)"
36 from optparse import OptionParser
38 matplotlib.interactive(True)
39 matplotlib.use('TkAgg')
41 class draw_constellation:
42 def __init__(self, filename, options):
43 self.hfile = open(filename, "r")
44 self.block_length = options.block
45 self.start = options.start
46 self.sample_rate = options.sample_rate
48 self.datatype = scipy.complex64
49 self.sizeof_data = self.datatype().nbytes # number of bytes per sample in file
51 self.axis_font_size = 16
52 self.label_font_size = 18
53 self.title_font_size = 20
56 self.fig = figure(1, figsize=(16, 9), facecolor='w')
57 rcParams['xtick.labelsize'] = self.axis_font_size
58 rcParams['ytick.labelsize'] = self.axis_font_size
60 self.text_file = figtext(0.10, 0.95, ("File: %s" % filename), weight="heavy", size=16)
61 self.text_file_pos = figtext(0.10, 0.90, "File Position: ", weight="heavy", size=16)
62 self.text_block = figtext(0.40, 0.90, ("Block Size: %d" % self.block_length),
63 weight="heavy", size=16)
64 self.text_sr = figtext(0.60, 0.90, ("Sample Rate: %.2f" % self.sample_rate),
65 weight="heavy", size=16)
68 self.button_left_axes = self.fig.add_axes([0.45, 0.01, 0.05, 0.05], frameon=True)
69 self.button_left = Button(self.button_left_axes, "<")
70 self.button_left_callback = self.button_left.on_clicked(self.button_left_click)
72 self.button_right_axes = self.fig.add_axes([0.50, 0.01, 0.05, 0.05], frameon=True)
73 self.button_right = Button(self.button_right_axes, ">")
74 self.button_right_callback = self.button_right.on_clicked(self.button_right_click)
76 self.xlim = self.sp_iq.get_xlim()
78 self.manager = get_current_fig_manager()
79 connect('draw_event', self.zoom)
80 connect('key_press_event', self.click)
84 self.text_file_pos.set_text("File Position: %d" % (self.hfile.tell()//self.sizeof_data))
85 iq = scipy.fromfile(self.hfile, dtype=self.datatype, count=self.block_length)
86 #print "Read in %d items" % len(iq)
90 self.reals = [r.real for r in iq]
91 self.imags = [i.imag for i in iq]
93 self.time = [i*(1/self.sample_rate) for i in range(len(self.reals))]
96 # if specified on the command-line, set file pointer
97 self.hfile.seek(self.sizeof_data*self.start, 1)
101 # Subplot for real and imaginary parts of signal
102 self.sp_iq = self.fig.add_subplot(2,1,1, position=[0.075, 0.2, 0.4, 0.6])
103 self.sp_iq.set_title(("I&Q"), fontsize=self.title_font_size, fontweight="bold")
104 self.sp_iq.set_xlabel("Time (s)", fontsize=self.label_font_size, fontweight="bold")
105 self.sp_iq.set_ylabel("Amplitude (V)", fontsize=self.label_font_size, fontweight="bold")
106 self.plot_iq = plot(self.time, self.reals, 'bo-', self.time, self.imags, 'ro-')
107 self.sp_iq.axis([min(self.time), max(self.time),
108 1.5*min([min(self.reals), min(self.imags)]),
109 1.5*max([max(self.reals), max(self.imags)])])
111 # Subplot for constellation plot
112 self.sp_const = self.fig.add_subplot(2,2,1, position=[0.575, 0.2, 0.4, 0.6])
113 self.sp_const.set_title(("Constellation"), fontsize=self.title_font_size, fontweight="bold")
114 self.sp_const.set_xlabel("Inphase", fontsize=self.label_font_size, fontweight="bold")
115 self.sp_const.set_ylabel("Qaudrature", fontsize=self.label_font_size, fontweight="bold")
116 self.plot_const = plot(self.reals, self.imags, 'bo')
117 self.sp_const.axis([-2, 2, -2, 2])
121 def update_plots(self):
122 self.plot_iq[0].set_data([self.time, self.reals])
123 self.plot_iq[1].set_data([self.time, self.imags])
124 self.sp_iq.axis([min(self.time), max(self.time),
125 1.5*min([min(self.reals), min(self.imags)]),
126 1.5*max([max(self.reals), max(self.imags)])])
128 self.plot_const[0].set_data([self.reals, self.imags])
129 self.sp_const.axis([-2, 2, -2, 2])
132 def zoom(self, event):
133 newxlim = self.sp_iq.get_xlim()
134 if(newxlim != self.xlim):
136 r = self.reals[int(ceil(self.xlim[0])) : int(ceil(self.xlim[1]))]
137 i = self.imags[int(ceil(self.xlim[0])) : int(ceil(self.xlim[1]))]
139 self.plot_const[0].set_data(r, i)
140 self.sp_const.axis([-2, 2, -2, 2])
141 self.manager.canvas.draw()
144 def click(self, event):
145 forward_valid_keys = [" ", "down", "right"]
146 backward_valid_keys = ["up", "left"]
148 if(find(event.key, forward_valid_keys)):
151 elif(find(event.key, backward_valid_keys)):
154 def button_left_click(self, event):
157 def button_right_click(self, event):
160 def step_forward(self):
164 def step_backward(self):
165 # Step back in file position
166 if(self.hfile.tell() >= 2*self.sizeof_data*self.block_length ):
167 self.hfile.seek(-2*self.sizeof_data*self.block_length, 1)
169 self.hfile.seek(-self.hfile.tell(),1)
174 def find(item_in, list_search):
176 return list_search.index(item_in) != None
182 usage="%prog: [options] input_filename"
183 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."
185 parser = OptionParser(conflict_handler="resolve", usage=usage, description=description)
186 parser.add_option("-B", "--block", type="int", default=1000,
187 help="Specify the block size [default=%default]")
188 parser.add_option("-s", "--start", type="int", default=0,
189 help="Specify where to start in the file [default=%default]")
190 parser.add_option("-R", "--sample-rate", type="float", default=1.0,
191 help="Set the sampler rate of the data [default=%default]")
193 (options, args) = parser.parse_args ()
199 dc = draw_constellation(filename, options)
201 if __name__ == "__main__":
204 except KeyboardInterrupt: