From 5d69a524f81f234b3fbc41d49ba18d6f6886baba Mon Sep 17 00:00:00 2001
From: jcorgan <jcorgan@221aa14e-8319-0410-a670-987f0aec2ac5>
Date: Thu, 3 Aug 2006 04:51:51 +0000
Subject: Houston, we have a trunk.
git-svn-id: http://gnuradio.org/svn/gnuradio/trunk@3122 221aa14e-8319-0410-a670-987f0aec2ac5
---
gnuradio-examples/python/usrp/usrp_nbfm_rcv.py | 362 +++++++++++++++++++++++++
1 file changed, 362 insertions(+)
create mode 100755 gnuradio-examples/python/usrp/usrp_nbfm_rcv.py
(limited to 'gnuradio-examples/python/usrp/usrp_nbfm_rcv.py')
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 0000000000..018a5b76e8
--- /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 ()
--
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