-#!/usr/bin/env python

-#

-# Copyright 2007,2008,2011 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.

-#

-

-try:

- import scipy

-except ImportError:

- print "Please install SciPy to run this script (http://www.scipy.org/)"

- raise SystemExit, 1

-

-try:

- from pylab import *

- from matplotlib.font_manager import fontManager, FontProperties

-except ImportError:

- print "Please install Matplotlib to run this script (http://matplotlib.sourceforge.net/)"

- raise SystemExit, 1

-

-from optparse import OptionParser

-

-class draw_constellation:

- def __init__(self, filename, options):

- self.hfile = open(filename, "r")

- self.block_length = options.block

- self.start = options.start

- self.sample_rate = options.sample_rate

-

- self.datatype = scipy.complex64

- self.sizeof_data = self.datatype().nbytes # number of bytes per sample in file

-

- self.axis_font_size = 16

- self.label_font_size = 18

- self.title_font_size = 20

-

- # Setup PLOT

- self.fig = figure(1, figsize=(16, 9), facecolor='w')

- rcParams['xtick.labelsize'] = self.axis_font_size

- rcParams['ytick.labelsize'] = self.axis_font_size

-

- self.text_file = figtext(0.10, 0.95, ("File: %s" % filename), weight="heavy", size=16)

- self.text_file_pos = figtext(0.10, 0.90, "File Position: ", weight="heavy", size=16)

- self.text_block = figtext(0.40, 0.90, ("Block Size: %d" % self.block_length),

- weight="heavy", size=16)

- self.text_sr = figtext(0.60, 0.90, ("Sample Rate: %.2f" % self.sample_rate),

- weight="heavy", size=16)

- self.make_plots()

-

- self.button_left_axes = self.fig.add_axes([0.45, 0.01, 0.05, 0.05], frameon=True)

- self.button_left = Button(self.button_left_axes, "<")

- self.button_left_callback = self.button_left.on_clicked(self.button_left_click)

-

- self.button_right_axes = self.fig.add_axes([0.50, 0.01, 0.05, 0.05], frameon=True)

- self.button_right = Button(self.button_right_axes, ">")

- self.button_right_callback = self.button_right.on_clicked(self.button_right_click)

-

- self.xlim = self.sp_iq.get_xlim()

-

- self.manager = get_current_fig_manager()

- connect('draw_event', self.zoom)

- connect('key_press_event', self.click)

- connect('button_press_event', self.mouse_button_callback)

- show()

-

- def get_data(self):

- self.text_file_pos.set_text("File Position: %d" % (self.hfile.tell()//self.sizeof_data))

- try:

- iq = scipy.fromfile(self.hfile, dtype=self.datatype, count=self.block_length)

- except MemoryError:

- print "End of File"

- else:

- # retesting length here as newer version of scipy does not throw a MemoryError, just

- # returns a zero-length array

- if(len(iq) > 0):

- self.reals = scipy.array([r.real for r in iq])

- self.imags = scipy.array([i.imag for i in iq])

-

- self.time = scipy.array([i*(1/self.sample_rate) for i in range(len(self.reals))])

- return True

- else:

- print "End of File"

- return False

-

- def make_plots(self):

- # if specified on the command-line, set file pointer

- self.hfile.seek(self.sizeof_data*self.start, 1)

-

- r = self.get_data()

-

- # Subplot for real and imaginary parts of signal

- self.sp_iq = self.fig.add_subplot(2,1,1, position=[0.075, 0.2, 0.4, 0.6])

- self.sp_iq.set_title(("I&Q"), fontsize=self.title_font_size, fontweight="bold")

- self.sp_iq.set_xlabel("Time (s)", fontsize=self.label_font_size, fontweight="bold")

- self.sp_iq.set_ylabel("Amplitude (V)", fontsize=self.label_font_size, fontweight="bold")

- self.plot_iq = self.sp_iq.plot(self.time, self.reals, 'bo-', self.time, self.imags, 'ro-')

-

- # Subplot for constellation plot

- self.sp_const = self.fig.add_subplot(2,2,1, position=[0.575, 0.2, 0.4, 0.6])

- self.sp_const.set_title(("Constellation"), fontsize=self.title_font_size, fontweight="bold")

- self.sp_const.set_xlabel("Inphase", fontsize=self.label_font_size, fontweight="bold")

- self.sp_const.set_ylabel("Qaudrature", fontsize=self.label_font_size, fontweight="bold")

- self.plot_const = self.sp_const.plot(self.reals, self.imags, 'bo')

-

- # Add plots to mark current location of point between time and constellation plots

- self.indx = 0

- self.plot_iq += self.sp_iq.plot([self.time[self.indx],], [self.reals[self.indx],], 'mo', ms=8)

- self.plot_iq += self.sp_iq.plot([self.time[self.indx],], [self.imags[self.indx],], 'mo', ms=8)

- self.plot_const += self.sp_const.plot([self.reals[self.indx],], [self.imags[self.indx],], 'mo', ms=12)

-

- # Adjust axis

- self.sp_iq.axis([self.time.min(), self.time.max(),

- 1.5*min([self.reals.min(), self.imags.min()]),

- 1.5*max([self.reals.max(), self.imags.max()])])

- self.sp_const.axis([-2, 2, -2, 2])

-

- draw()

-

- def update_plots(self):

- self.plot_iq[0].set_data([self.time, self.reals])

- self.plot_iq[1].set_data([self.time, self.imags])

- self.sp_iq.axis([self.time.min(), self.time.max(),

- 1.5*min([self.reals.min(), self.imags.min()]),

- 1.5*max([self.reals.max(), self.imags.max()])])

-

- self.plot_const[0].set_data([self.reals, self.imags])

- self.sp_const.axis([-2, 2, -2, 2])

- draw()

-

- def zoom(self, event):

- newxlim = scipy.array(self.sp_iq.get_xlim())

- curxlim = scipy.array(self.xlim)

- if(newxlim[0] != curxlim[0] or newxlim[1] != curxlim[1]):

- self.xlim = newxlim

- r = self.reals[int(ceil(self.xlim[0])) : int(ceil(self.xlim[1]))]

- i = self.imags[int(ceil(self.xlim[0])) : int(ceil(self.xlim[1]))]

-

- self.plot_const[0].set_data(r, i)

- self.sp_const.axis([-2, 2, -2, 2])

- self.manager.canvas.draw()

- draw()

-

- def click(self, event):

- forward_valid_keys = [" ", "down", "right"]

- backward_valid_keys = ["up", "left"]

- trace_forward_valid_keys = [">",]

- trace_backward_valid_keys = ["<",]

-

- if(find(event.key, forward_valid_keys)):

- self.step_forward()

-

- elif(find(event.key, backward_valid_keys)):

- self.step_backward()

-

- elif(find(event.key, trace_forward_valid_keys)):

- self.indx = min(self.indx+1, len(self.time)-1)

- self.set_trace(self.indx)

-

- elif(find(event.key, trace_backward_valid_keys)):

- self.indx = max(0, self.indx-1)

- self.set_trace(self.indx)

-

- def button_left_click(self, event):

- self.step_backward()

-

- def button_right_click(self, event):

- self.step_forward()

-

- def step_forward(self):

- r = self.get_data()

- if(r):

- self.update_plots()

-

- def step_backward(self):

- # Step back in file position

- if(self.hfile.tell() >= 2*self.sizeof_data*self.block_length ):

- self.hfile.seek(-2*self.sizeof_data*self.block_length, 1)

- else:

- self.hfile.seek(-self.hfile.tell(),1)

- r = self.get_data()

- if(r):

- self.update_plots()

-

-

- def mouse_button_callback(self, event):

- x, y = event.xdata, event.ydata

-

- if x is not None and y is not None:

- if(event.inaxes == self.sp_iq):

- self.indx = searchsorted(self.time, [x])

- self.set_trace(self.indx)

-

-

- def set_trace(self, indx):

- self.plot_iq[2].set_data(self.time[indx], self.reals[indx])

- self.plot_iq[3].set_data(self.time[indx], self.imags[indx])

- self.plot_const[1].set_data(self.reals[indx], self.imags[indx])

- draw()

-

-

-def find(item_in, list_search):

- try:

- return list_search.index(item_in) != None

- except ValueError:

- return False

-

-

-def main():

- usage="%prog: [options] input_filename"

- 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."

-

- parser = OptionParser(conflict_handler="resolve", usage=usage, description=description)

- parser.add_option("-B", "--block", type="int", default=1000,

- help="Specify the block size [default=%default]")

- parser.add_option("-s", "--start", type="int", default=0,

- help="Specify where to start in the file [default=%default]")

- parser.add_option("-R", "--sample-rate", type="float", default=1.0,

- help="Set the sampler rate of the data [default=%default]")

-

- (options, args) = parser.parse_args ()

- if len(args) != 1:

- parser.print_help()

- raise SystemExit, 1

- filename = args[0]

-

- dc = draw_constellation(filename, options)

-

-if __name__ == "__main__":

- try:

- main()

- except KeyboardInterrupt:

- pass

-

-

-