Houston, we have a trunk.

git-svn-id: http://gnuradio.org/svn/gnuradio/trunk@3122 221aa14e-8319-0410-a670-987f0aec2ac5

1 files changed, 362 insertions, 0 deletions

diff --git a/gnuradio-examples/python/usrp/usrp_nbfm_rcv.py b/gnuradio-examples/python/usrp/usrp_nbfm_rcv.py
new file mode 100755
index 000000000..018a5b76e
--- /dev/null
+++ b/gnuradio-examples/python/usrp/usrp_nbfm_rcv.py
@@ -0,0 +1,362 @@
+#!/usr/bin/env python
+
+from gnuradio import gr, gru, eng_notation, optfir
+from gnuradio import audio
+from gnuradio import usrp
+from gnuradio import blks
+from gnuradio.eng_option import eng_option
+from gnuradio.wxgui import slider, powermate
+from gnuradio.wxgui import stdgui, fftsink, form
+from optparse import OptionParser
+import usrp_dbid
+import sys
+import math
+import wx
+
+
+#////////////////////////////////////////////////////////////////////////
+#                           Control Stuff
+#////////////////////////////////////////////////////////////////////////
+
+class my_graph (stdgui.gui_flow_graph):
+    def __init__(self,frame,panel,vbox,argv):
+        stdgui.gui_flow_graph.__init__ (self,frame,panel,vbox,argv)
+
+        parser=OptionParser(option_class=eng_option)
+        parser.add_option("-R", "--rx-subdev-spec", type="subdev", default=None,
+                          help="select USRP Rx side A or B (default=A)")
+        parser.add_option("-f", "--freq", type="eng_float", default=146.585e6,
+                          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("-V", "--volume", type="eng_float", default=None,
+                          help="set volume (default is midpoint)")
+        parser.add_option("-O", "--audio-output", type="string", default="",
+                          help="pcm device name.  E.g., hw:0,0 or surround51 or /dev/dsp")
+        parser.add_option("-N", "--no-gui", action="store_true", default=False)
+
+        (options, args) = parser.parse_args()
+        if len(args) != 0:
+            parser.print_help()
+            sys.exit(1)
+        
+        if options.freq < 1e6:
+            options.freq *= 1e6
+            
+        self.frame = frame
+        self.panel = panel
+        
+        self.state = "FREQ"
+        self.freq = 0
+        self.freq_step = 25e3
+
+        self.rxpath = receive_path(self, options.rx_subdev_spec, options.gain, options.audio_output)
+
+        self._build_gui(vbox, options.no_gui)
+
+        # set initial values
+
+        if options.volume is not None:
+            self.set_volume(options.volume)
+
+        if not(self.set_freq(options.freq)):
+            self._set_status_msg("Failed to set initial frequency")
+
+        self.set_gain(self.rxpath.gain)               # update gui
+        self.set_volume(self.rxpath.volume)           # update gui
+        self.set_squelch(self.rxpath.threshold())     # update gui
+
+
+    def _set_status_msg(self, msg, which=0):
+        self.frame.GetStatusBar().SetStatusText(msg, which)
+
+
+    def _build_gui(self, vbox, no_gui):
+
+        def _form_set_freq(kv):
+            return self.set_freq(kv['freq'])
+
+
+        self.src_fft = None
+        if 1 and not(no_gui):
+            self.src_fft = fftsink.fft_sink_c (self, self.panel, title="Data from USRP",
+                                               fft_size=512, sample_rate=self.rxpath.if_rate,
+                                               ref_level=80, y_per_div=20)
+            self.connect (self.rxpath.u, self.src_fft)
+            vbox.Add (self.src_fft.win, 4, wx.EXPAND)
+
+        if 1 and not(no_gui):
+            rx_fft = fftsink.fft_sink_c (self, self.panel, title="Post s/w DDC",
+                                         fft_size=512, sample_rate=self.rxpath.quad_rate,
+                                         ref_level=80, y_per_div=20)
+            self.connect (self.rxpath.ddc, rx_fft)
+            vbox.Add (rx_fft.win, 4, wx.EXPAND)
+        
+        if 1 and not(no_gui):
+            post_deemph_fft = fftsink.fft_sink_f (self, self.panel, title="Post Deemph",
+                                                  fft_size=512, sample_rate=self.rxpath.audio_rate,
+                                                  y_per_div=10, ref_level=-40)
+            self.connect (self.rxpath.fmrx.deemph, post_deemph_fft)
+            vbox.Add (post_deemph_fft.win, 4, wx.EXPAND)
+
+        if 0:
+            post_filt_fft = fftsink.fft_sink_f (self, self.panel, title="Post Filter", 
+                                                fft_size=512, sample_rate=audio_rate,
+                                                y_per_div=10, ref_level=-40)
+            self.connect (self.guts.audio_filter, post_filt)
+            vbox.Add (fft_win4, 4, wx.EXPAND)
+
+        
+        # control area form at bottom
+        self.myform = myform = form.form()
+
+        hbox = wx.BoxSizer(wx.HORIZONTAL)
+        hbox.Add((5,0), 0)
+        myform['freq'] = form.float_field(
+            parent=self.panel, sizer=hbox, label="Freq", weight=1,
+            callback=myform.check_input_and_call(_form_set_freq, self._set_status_msg))
+
+        #hbox.Add((5,0), 0)
+        #myform['freq_slider'] = \
+        #    form.quantized_slider_field(parent=self.panel, sizer=hbox, weight=3,
+        #                                range=(87.9e6, 108.1e6, 0.1e6),
+        #                                callback=self.set_freq)
+
+        hbox.Add((5,0), 0)
+        vbox.Add(hbox, 0, wx.EXPAND)
+
+        hbox = wx.BoxSizer(wx.HORIZONTAL)
+        hbox.Add((5,0), 0)
+
+        myform['volume'] = \
+            form.quantized_slider_field(parent=self.panel, sizer=hbox, label="Volume",
+                                        weight=3, range=self.volume_range(),
+                                        callback=self.set_volume)
+        hbox.Add((5,0), 0)
+        myform['squelch'] = \
+            form.quantized_slider_field(parent=self.panel, sizer=hbox, label="Squelch",
+                                        weight=3, range=self.rxpath.squelch_range(),
+                                        callback=self.set_squelch)
+        hbox.Add((5,0), 0)
+        myform['gain'] = \
+            form.quantized_slider_field(parent=self.panel, sizer=hbox, label="Gain",
+                                        weight=3, range=self.rxpath.subdev.gain_range(),
+                                        callback=self.set_gain)
+        hbox.Add((5,0), 0)
+        vbox.Add(hbox, 0, wx.EXPAND)
+
+        try:
+            self.knob = powermate.powermate(self.frame)
+            self.rot = 0
+            powermate.EVT_POWERMATE_ROTATE (self.frame, self.on_rotate)
+            powermate.EVT_POWERMATE_BUTTON (self.frame, self.on_button)
+        except:
+            print "FYI: No Powermate or Contour Knob found"
+
+
+    def on_rotate (self, event):
+        self.rot += event.delta
+        if (self.state == "FREQ"):
+            if self.rot >= 3:
+                self.set_freq(self.freq + self.freq_step)
+                self.rot -= 3
+            elif self.rot <=-3:
+                self.set_freq(self.freq - self.freq_step)
+                self.rot += 3
+        else:
+            step = self.volume_range()[2]
+            if self.rot >= 3:
+                self.set_volume(self.rxpath.volume + step)
+                self.rot -= 3
+            elif self.rot <=-3:
+                self.set_volume(self.rxpath.volume - step)
+                self.rot += 3
+            
+    def on_button (self, event):
+        if event.value == 0:        # button up
+            return
+        self.rot = 0
+        if self.state == "FREQ":
+            self.state = "VOL"
+        else:
+            self.state = "FREQ"
+        self.update_status_bar ()
+        
+
+    def set_squelch(self, threshold_in_db):
+        self.rxpath.set_squelch(threshold_in_db)
+        self.myform['squelch'].set_value(self.rxpath.threshold())
+
+    def set_volume (self, vol):
+        self.rxpath.set_volume(vol)
+        self.myform['volume'].set_value(self.rxpath.volume)
+        self.update_status_bar ()
+                                        
+    def set_freq(self, target_freq):
+        r = self.rxpath.set_freq(target_freq)
+        if r:
+            self.freq = target_freq
+            self.myform['freq'].set_value(target_freq)         # update displayed value
+            #self.myform['freq_slider'].set_value(target_freq)  # update displayed value
+            self.update_status_bar()
+            self._set_status_msg("OK", 0)
+            return True
+
+        self._set_status_msg("Failed", 0)
+        return False
+
+    def set_gain(self, gain):
+        self.myform['gain'].set_value(gain)     # update displayed value
+        self.rxpath.set_gain(gain)
+
+    def update_status_bar (self):
+        msg = "Volume:%r  Setting:%s" % (self.rxpath.volume, self.state)
+        self._set_status_msg(msg, 1)
+        if self.src_fft:
+            self.src_fft.set_baseband_freq(self.freq)
+
+    def volume_range(self):
+        return (-20.0, 0.0, 0.5)
+        
+
+#////////////////////////////////////////////////////////////////////////
+#                           Receive Path
+#////////////////////////////////////////////////////////////////////////
+
+USE_SIMPLE_SQUELCH = False
+
+class receive_path(gr.hier_block):
+    def __init__(self, fg, subdev_spec, gain, audio_output):
+
+        self.u = usrp.source_c ()
+        adc_rate = self.u.adc_rate()
+
+        self.if_rate = 256e3                              # 256 kS/s
+        usrp_decim = int(adc_rate // self.if_rate)
+        if_decim = 4
+        self.u.set_decim_rate(usrp_decim)
+        self.quad_rate = self.if_rate // if_decim         #  64 kS/s
+        audio_decim = 2
+        self.audio_rate = self.quad_rate // audio_decim   #  32 kS/s
+
+
+        if subdev_spec is None:
+            subdev_spec = usrp.pick_rx_subdevice(self.u)
+        self.subdev = usrp.selected_subdev(self.u, subdev_spec)
+        print "Using RX d'board %s" % (self.subdev.side_and_name(),)
+
+        self.u.set_mux(usrp.determine_rx_mux_value(self.u, subdev_spec))
+
+        # Create filter to get actual channel we want
+        chan_coeffs = gr.firdes.low_pass (1.0,                # gain
+                                          self.if_rate,       # sampling rate
+                                          13e3,               # low pass cutoff freq
+                                          4e3,                # width of trans. band
+                                          gr.firdes.WIN_HANN) # filter type 
+
+        print "len(rx_chan_coeffs) =", len(chan_coeffs)
+
+        # Decimating Channel filter with frequency translation
+        # complex in and out, float taps
+        self.ddc = gr.freq_xlating_fir_filter_ccf(if_decim,       # decimation rate
+                                                  chan_coeffs,    # taps
+                                                  0,              # frequency translation amount
+                                                  self.if_rate)   # input sample rate
+
+        if USE_SIMPLE_SQUELCH:
+            self.squelch = gr.simple_squelch_cc(20)
+        else:
+            self.squelch = blks.standard_squelch(fg, self.audio_rate)
+
+        # instantiate the guts of the single channel receiver
+        self.fmrx = blks.nbfm_rx(fg, self.audio_rate, self.quad_rate)
+
+        # audio gain / mute block
+        self._audio_gain = gr.multiply_const_ff(1.0)
+
+        # sound card as final sink
+        audio_sink = audio.sink (int(self.audio_rate), audio_output)
+        
+        # now wire it all together
+        if USE_SIMPLE_SQUELCH:
+            fg.connect (self.u, self.ddc, self.squelch, self.fmrx,
+                        self._audio_gain, audio_sink)
+        else:
+            fg.connect (self.u, self.ddc, self.fmrx, self.squelch,
+                        self._audio_gain, audio_sink)
+
+        gr.hier_block.__init__(self, fg, self.u, audio_sink)
+
+        if gain is None:
+            # if no gain was specified, use the mid-point in dB
+            g = self.subdev.gain_range()
+            gain = float(g[0]+g[1])/2
+
+        self.set_gain(gain)
+
+        v = self.volume_range()
+        self.set_volume((v[0]+v[1])/2)
+        s = self.squelch_range()
+        self.set_squelch((s[0]+s[1])/2)
+
+    def volume_range(self):
+        return (-20.0, 0.0, 0.5)
+
+    def set_volume (self, vol):
+        g = self.volume_range()
+        self.volume = max(g[0], min(g[1], vol))
+        self._update_audio_gain()
+
+    def _update_audio_gain(self):
+        self._audio_gain.set_k(10**(self.volume/10))
+        
+    def squelch_range(self):
+        r = self.squelch.squelch_range()
+        #print "squelch_range: ", r
+        return r
+    
+    def set_squelch(self, threshold):
+        #print "SQL =", threshold
+        self.squelch.set_threshold(threshold)
+
+    def threshold(self):
+        t = self.squelch.threshold()
+        #print "t =", t
+        return t
+
+    def set_freq(self, target_freq):
+        """
+        Set the center frequency we're interested in.
+
+        @param target_freq: frequency in Hz
+        @rypte: bool
+
+        Tuning is a two step process.  First we ask the front-end to
+        tune as close to the desired frequency as it can.  Then we use
+        the result of that operation and our target_frequency to
+        determine the value for the digital down converter in the
+        FPGA.  Finally, we feed any residual_freq to the s/w freq
+        translator.
+        """
+
+        r = usrp.tune(self.u, 0, self.subdev, target_freq)
+        if r:
+            # Use residual_freq in s/w freq translater
+            # print "residual_freq =", r.residual_freq
+            self.ddc.set_center_freq(-r.residual_freq)
+            return True
+
+        return False
+
+    def set_gain(self, gain):
+        self.gain = gain
+        self.subdev.set_gain(gain)
+
+
+# ////////////////////////////////////////////////////////////////////////
+#                                Main
+# ////////////////////////////////////////////////////////////////////////
+
+if __name__ == '__main__':
+    app = stdgui.stdapp (my_graph, "USRP NBFM RX")
+    app.MainLoop ()