1 files changed, 180 insertions, 0 deletions
diff --git a/gr-utils/src/python/gr_plot_iq.py b/gr-utils/src/python/gr_plot_iq.py
new file mode 100755
index 000000000..2a4142a81
--- /dev/null
+++ b/gr-utils/src/python/gr_plot_iq.py
@@ -0,0 +1,180 @@
+#!/usr/bin/env python
+#
+# Copyright 2007,2008 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.
+# 
+
+try:
+    import scipy
+except ImportError:
+    print "Please install SciPy to run this script (http://www.scipy.org/)"
+    raise SystemExit, 1
+
+try:
+    from pylab import *
+except ImportError:
+    print "Please install Matplotlib to run this script (http://matplotlib.sourceforge.net/)"
+    raise SystemExit, 1
+
+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.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
+        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()//self.sizeof_data))
+        self.iq = scipy.fromfile(self.hfile, dtype=self.datatype, 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(self.sizeof_data*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() >= 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)
+        self.get_data()
+        self.update_plots()
+        
+
+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. 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
+    
+
+