#!/usr/bin/env python # # Copyright 2007 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. # import scipy from pylab import * from optparse import OptionParser matplotlib.interactive(True) matplotlib.use('TkAgg') class draw_fft: 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.axis_font_size = 16 self.label_font_size = 18 self.title_font_size = 20 self.text_size = 22 # 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, 0.94, ("File: %s" % filename), weight="heavy", size=self.text_size) self.text_file_pos = figtext(0.10, 0.88, "File Position: ", weight="heavy", size=self.text_size) self.text_block = figtext(0.40, 0.88, ("Block Size: %d" % self.block_length), weight="heavy", size=self.text_size) self.text_sr = figtext(0.60, 0.88, ("Sample Rate: %.2f" % self.sample_rate), weight="heavy", size=self.text_size) 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('key_press_event', self.click) show() def get_data(self): self.text_file_pos.set_text("File Position: %d" % (self.hfile.tell()//8)) self.iq = scipy.fromfile(self.hfile, dtype=scipy.complex64, count=self.block_length) #print "Read in %d items" % len(self.iq) if(len(self.iq) == 0): print "End of File" else: self.reals = [r.real for r in self.iq] self.imags = [i.imag for i in self.iq] self.time = [i*(1/self.sample_rate) for i in range(len(self.reals))] def make_plots(self): # if specified on the command-line, set file pointer self.hfile.seek(16*self.start, 1) self.get_data() # Subplot for real and imaginary parts of signal self.sp_iq = self.fig.add_subplot(2,1,1, position=[0.075, 0.14, 0.85, 0.67]) 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 = plot(self.time, self.reals, 'bo-', self.time, self.imags, 'ro-') self.sp_iq.set_ylim([1.5*min([min(self.reals), min(self.imags)]), 1.5*max([max(self.reals), max(self.imags)])]) 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.set_ylim([1.5*min([min(self.reals), min(self.imags)]), 1.5*max([max(self.reals), max(self.imags)])]) draw() def click(self, event): forward_valid_keys = [" ", "down", "right"] backward_valid_keys = ["up", "left"] if(find(event.key, forward_valid_keys)): self.step_forward() elif(find(event.key, backward_valid_keys)): self.step_backward() def button_left_click(self, event): self.step_backward() def button_right_click(self, event): self.step_forward() def step_forward(self): self.get_data() self.update_plots() def step_backward(self): # Step back in file position if(self.hfile.tell() >= 16*self.block_length ): self.hfile.seek(-16*self.block_length, 1) else: self.hfile.seek(-self.hfile.tell(),1) self.get_data() self.update_plots() #FIXME: there must be a way to do this with a Python builtin def find(item_in, list_search): for l in list_search: if item_in == l: return True 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. 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_fft(filename, options) if __name__ == "__main__": try: main() except KeyboardInterrupt: pass