apps: add spectrum browser and signal generator

usage examples:

osmocom_fft -a "rtl=0" -f 100e6 -s 2.4e6 -g 15

osmocom_siggen_gui -a "hackrf=0" -s 5e6 -f 100e6 --sine
osmocom_siggen_gui -a "hackrf=0" -s 5e6 -f 100e6 --sweep -x 2M -y 1 -c34

known issues:
- switching between siggen modes is broken at the moment (WIP) and has
to be made via cli switches only.
- filter bandwidth controls have no effect for TX (this has to be
investigated)

1 files changed, 270 insertions, 0 deletions

diff --git a/apps/osmocom_fft b/apps/osmocom_fft
new file mode 100755
index 0000000..5449354
--- /dev/null
+++ b/apps/osmocom_fft
@@ -0,0 +1,270 @@
+#!/usr/bin/env python
+#
+# Copyright 2012 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 osmosdr
+from gnuradio import gr, gru
+from gnuradio import eng_notation
+from gnuradio.eng_option import eng_option
+from optparse import OptionParser
+
+import sys
+import numpy
+
+try:
+    from gnuradio.wxgui import stdgui2, form, slider
+    from gnuradio.wxgui import forms
+    from gnuradio.wxgui import fftsink2, waterfallsink2, scopesink2
+    import wx
+except ImportError:
+    sys.stderr.write("Error importing GNU Radio's wxgui. Please make sure gr-wxgui is installed.\n")
+    sys.exit(1)
+
+class app_top_block(stdgui2.std_top_block):
+    def __init__(self, frame, panel, vbox, argv):
+        stdgui2.std_top_block.__init__(self, frame, panel, vbox, argv)
+
+        self.frame = frame
+        self.panel = panel
+
+        parser = OptionParser(option_class=eng_option)
+        parser.add_option("-a", "--args", type="string", default="",
+                          help="device args, [default=%default]")
+        parser.add_option("-A", "--antenna", type="string", default=None,
+                          help="select Rx Antenna where appropriate")
+        parser.add_option("-s", "--samp-rate", type="eng_float", default=1e6,
+                          help="set sample rate (bandwidth) [default=%default]")
+        parser.add_option("-f", "--freq", type="eng_float", default=None,
+                          help="set frequency to FREQ", metavar="FREQ")
+        parser.add_option("-g", "--gain", type="eng_float", default=None,
+                          help="set gain in dB (default is midpoint)")
+        parser.add_option("-W", "--waterfall", action="store_true", default=False,
+                          help="Enable waterfall display")
+        parser.add_option("-S", "--oscilloscope", action="store_true", default=False,
+                          help="Enable oscilloscope display")
+        parser.add_option("", "--avg-alpha", type="eng_float", default=1e-1,
+                          help="Set fftsink averaging factor, default=[%default]")
+        parser.add_option ("", "--averaging", action="store_true", default=False,
+                          help="Enable fftsink averaging, default=[%default]")
+        parser.add_option("", "--ref-scale", type="eng_float", default=1.0,
+                          help="Set dBFS=0dB input value, default=[%default]")
+        parser.add_option("", "--fft-size", type="int", default=1024,
+                          help="Set number of FFT bins [default=%default]")
+        parser.add_option("", "--fft-rate", type="int", default=30,
+                          help="Set FFT update rate, [default=%default]")
+
+        (options, args) = parser.parse_args()
+        if len(args) != 0:
+            parser.print_help()
+            sys.exit(1)
+        self.options = options
+        self.show_debug_info = True
+
+        self.src = osmosdr.source_c(options.args)
+
+        # Set the antenna
+        if(options.antenna):
+            self.src.set_antenna(options.antenna, 0)
+
+        self.src.set_sample_rate(options.samp_rate)
+        input_rate = self.src.get_sample_rate()
+
+        if options.waterfall:
+            self.scope = \
+              waterfallsink2.waterfall_sink_c (panel, fft_size=1024,
+                                               sample_rate=input_rate)
+            self.frame.SetMinSize((800, 420))
+        elif options.oscilloscope:
+            self.scope = scopesink2.scope_sink_c(panel, sample_rate=input_rate)
+            self.frame.SetMinSize((800, 600))
+        else:
+            self.scope = fftsink2.fft_sink_c (panel,
+                                              fft_size=options.fft_size,
+                                              sample_rate=input_rate,
+                                              ref_scale=options.ref_scale,
+                                              ref_level=20.0,
+                                              y_divs = 12,
+                                              average=options.averaging,
+                                              avg_alpha=options.avg_alpha,
+                                              fft_rate=options.fft_rate)
+            def fftsink_callback(x, y):
+                self.set_freq(x)
+                
+            self.scope.set_callback(fftsink_callback)
+            self.frame.SetMinSize((800, 420))
+
+        self.connect(self.src, self.scope)
+
+        self._build_gui(vbox)
+        self._setup_events()
+
+
+        # set initial values
+
+        if options.gain is None:
+            # if no gain was specified, use the mid-point in dB
+            g = self.src.get_gain_range()
+            options.gain = float(g.start()+g.stop())/2
+
+        if options.freq is None:
+            # if no freq was specified, use the mid-point
+            r = self.src.get_freq_range()
+            options.freq = float(r.start()+r.stop())/2
+
+        self.set_gain(options.gain)
+
+        if self.show_debug_info:
+            self.myform['samprate'].set_value(self.src.get_sample_rate())
+
+        if not(self.set_freq(options.freq)):
+            self._set_status_msg("Failed to set initial frequency")
+
+    def _set_status_msg(self, msg):
+        self.frame.GetStatusBar().SetStatusText(msg, 0)
+
+    def _build_gui(self, vbox):
+
+        def _form_set_freq(kv):
+            return self.set_freq(kv['freq'])
+
+        vbox.Add(self.scope.win, 10, wx.EXPAND)
+
+        # add control area at the bottom
+        self.myform = myform = form.form()
+        hbox = wx.BoxSizer(wx.HORIZONTAL)
+        hbox.Add((4,0), 0, 0)
+        myform['freq'] = form.float_field(
+            parent=self.panel, sizer=hbox, label="Center freq", weight=1,
+            callback=myform.check_input_and_call(_form_set_freq,
+                                                 self._set_status_msg))
+
+        hbox.Add((4,0), 0, 0)
+        g = self.src.get_gain_range()
+
+        # some configurations don't have gain control
+        if g.stop() <= g.start():
+            glow = 0.0
+            ghigh = 1.0
+
+        else:
+            glow = g.start()
+            ghigh = g.stop()
+
+        myform['gain'] = form.slider_field(parent=self.panel,
+                                               sizer=hbox, label="Gain",
+                                               weight=3,
+                                               min=int(glow), max=int(ghigh),
+                                               callback=self.set_gain)
+        hbox.Add((4,0), 0, 0)
+        vbox.Add(hbox, 0, wx.EXPAND)
+
+        self._build_subpanel(vbox)
+
+    def _build_subpanel(self, vbox_arg):
+        # build a secondary information panel (sometimes hidden)
+
+        # FIXME figure out how to have this be a subpanel that is always
+        # created, but has its visibility controlled by foo.Show(True/False)
+
+        def _form_set_sample_rate(kv):
+            return self.set_sample_rate(kv['samprate'])
+
+        if not(self.show_debug_info):
+            return
+
+        panel = self.panel
+        vbox = vbox_arg
+        myform = self.myform
+
+        hbox = wx.BoxSizer(wx.HORIZONTAL)
+
+        hbox.Add((4,0), 0)
+        myform['samprate'] = form.float_field(
+            parent=panel, sizer=hbox, label="Sample Rate",
+            callback=myform.check_input_and_call(_form_set_sample_rate,
+                                                 self._set_status_msg))
+        vbox.AddSpacer(5)
+
+        vbox.Add(hbox, 0, wx.EXPAND)
+        vbox.AddSpacer(5)
+
+    def set_freq(self, target_freq):
+        """
+        Set the center frequency we're interested in.
+
+        @param target_freq: frequency in Hz
+        @rypte: bool
+        """
+        actual_freq = self.src.set_center_freq(target_freq, 0)
+        self.myform['freq'].set_value(actual_freq)
+
+        if not self.options.oscilloscope:
+            self.scope.set_baseband_freq(actual_freq)
+
+        return True
+
+    def set_gain(self, gain):
+        if self.myform.has_key('gain'):
+            self.myform['gain'].set_value(gain)     # update displayed value
+        self.src.set_gain(gain, 0)
+
+    def set_sample_rate(self, samp_rate):
+        ok = self.src.set_sample_rate(samp_rate)
+        input_rate = self.src.get_sample_rate()
+        self.scope.set_sample_rate(input_rate)
+        if self.show_debug_info:  # update displayed values
+            self.myform['samprate'].set_value(self.src.get_sample_rate())
+
+        # set_sample_rate never fails; always falls back to closest requested.
+        return True
+
+    def _setup_events(self):
+        if not self.options.waterfall and not self.options.oscilloscope:
+            self.scope.win.Bind(wx.EVT_LEFT_DCLICK, self.evt_left_dclick)
+
+    def evt_left_dclick(self, event):
+        (ux, uy) = self.scope.win.GetXY(event)
+        if event.CmdDown():
+            # Re-center on maximum power
+            points = self.scope.win._points
+            if self.scope.win.peak_hold:
+                if self.scope.win.peak_vals is not None:
+                    ind = numpy.argmax(self.scope.win.peak_vals)
+                else:
+                    ind = int(points.shape()[0]/2)
+            else:
+                ind = numpy.argmax(points[:,1])
+
+            (freq, pwr) = points[ind]
+            target_freq = freq/self.scope.win._scale_factor
+            print ind, freq, pwr
+            self.set_freq(target_freq)
+        else:
+            # Re-center on clicked frequency
+            target_freq = ux/self.scope.win._scale_factor
+            self.set_freq(target_freq)
+
+def main ():
+    app = stdgui2.stdapp(app_top_block, "OSMOCOM Spectrum Browser", nstatus=1)
+    app.MainLoop()
+
+if __name__ == '__main__':
+    main ()