#!/usr/bin/env python from gnuradio import gr, gru, eng_notation, optfir from gnuradio import audio from gnuradio import cxadc 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 def pick_subdevice(u): """ The user didn't specify a subdevice on the command line. Try for one of these, in order: TV_RX, BASIC_RX, whatever is on side A. @return a subdev_spec """ return usrp.pick_subdev(u, (usrp_dbid.TV_RX, usrp_dbid.TV_RX_REV_2, usrp_dbid.BASIC_RX)) class wfm_rx_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=100.1e6, help="set frequency to FREQ", metavar="FREQ") parser.add_option("-i", "--if-freq", type="eng_float", default=5.75e6, help="give IF frequency of rf-frontend [default=5.75e6] set to zero, if you have no frontend.", metavar="FREQ") parser.add_option("-g", "--gain", type="eng_float", default=40, 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( "-u","--use-usrp-for-tuning", action="store_true", default=False, help="use an usrp to tune a TVRX tuner frontend (connect the IF-output to the video-in of the cx2388x capture card)") (options, args) = parser.parse_args() if len(args) != 0: parser.print_help() sys.exit(1) self.frame = frame self.panel = panel self.vol = 0 self.state = "FREQ" self.freq = 0 self.use_usrp_for_tuning=options.use_usrp_for_tuning # build graph if self.use_usrp_for_tuning: self.u = usrp.source_c() # usrp is only used for tuning TVRX of which you can connect the IF-output to the cx2388xx TV capture card video-in expected_crystal_freq=28.63636e6 actual_crystal_freq=32.0e6 #I modified my board with a 32 MHz crystal, default this is a 28.63636e6 crystal or oscillator default_resample_rate=27.0e6 resample_rate=default_resample_rate adc_rate= resample_rate * actual_crystal_freq/expected_crystal_freq #// public shared_ptr constructor #cxadc_source_sptr #cxadc_make_source (double sampling_freq = 27e6,//sampling_freq is ignored at the moment. TODO: implement sampling_freq # int do_avg_frame=1, # double frame_avg_alpha=0.01, # const std::string dev = "/dev/cxadc") throw (std::runtime_error); if True: #options.input_shorts: do_remove_dc=1 self.cxadc=cxadc.source (adc_rate,do_remove_dc,0.1,"/dev/cxadc") self.fsrc=gr.short_to_float() #self.csrc= gr.interleaved_short_to_complex() self.connect(self.cxadc,self.fsrc) else: self.fsrc= cxadc.source_f (sampling_freq = adc_rate,do_avg_frame=True,frame_avg_alpha=0.01,dev = "/dev/cxadc") #adc_rate = self.u.adc_rate() # 64 MS/s cxadc_rate = adc_rate #/ usrp_decim # 320 kS/s factor=1 chanfilt_decim = 100#100*factor demod_rate = cxadc_rate / chanfilt_decim audio_decimation = 10#10/factor audio_rate = demod_rate / (1*audio_decimation) # 32 kHz if self.use_usrp_for_tuning: if options.rx_subdev_spec is None: options.rx_subdev_spec = pick_subdevice(self.u) self.subdev = usrp.selected_subdev(self.u, options.rx_subdev_spec) print "Using RX d'board %s" % (self.subdev.side_and_name(),) #chan_filt_coeffs = optfir.low_pass (1, # gain # cxadc_rate, # sampling rate # 80e3, # passband cutoff # 115e3, # stopband cutoff # 0.1, # passband ripple # 60) # stopband attenuation use_firdes=False if use_firdes: chan_filt_coeffs = gr.firdes.low_pass ( 1, cxadc_rate, 125.0e3, #100.0e3 50.0e3 #20.0e3 ) else: chan_filt_coeffs = optfir.low_pass (1, # gain cxadc_rate, # sampling rate 80e3, # passband cutoff 1.5*115e3, # stopband cutoff 10*0.1, # passband ripple 60) # stopband attenuation #print len(chan_filt_coeffs) #chan_filt = gr.fir_filter_ccf (chanfilt_decim, chan_filt_coeffs) chan_filt = gr.freq_xlating_fir_filter_fcf (chanfilt_decim, chan_filt_coeffs, options.if_freq, adc_rate) #cxadc_rate) self.guts = blks.wfm_rcv (self, demod_rate, audio_decimation) self.volume_control = gr.multiply_const_ff(self.vol) # sound card as final sink audio_sink = audio.sink (int (audio_rate), options.audio_output, False) # ok_to_block # now wire it all together self.connect (self.fsrc, chan_filt, self.guts, self.volume_control, audio_sink) self._build_gui(vbox, cxadc_rate, demod_rate, audio_rate) if options.gain is None: # if no gain was specified, use the mid-point in dB if self.use_usrp_for_tuning: g = self.subdev.gain_range() options.gain = float(g[0]+g[1])/2 else: options.gain =0 if options.volume is None: g = self.volume_range() options.volume = float(g[0]+g[1])/2 if abs(options.freq) < 1e6: options.freq *= 1e6 # set initial values self.set_gain(options.gain) self.set_vol(options.volume) if not(self.set_freq(options.freq)): self._set_status_msg("Failed to set initial frequency") def _set_status_msg(self, msg, which=0): self.frame.GetStatusBar().SetStatusText(msg, which) def _build_gui(self, vbox, cxadc_rate, demod_rate, audio_rate): def _form_set_freq(kv): return self.set_freq(kv['freq']) if 1: self.src_fft = fftsink.fft_sink_f (self, self.panel, title="Data from CXADC", fft_size=512, sample_rate=cxadc_rate) self.connect (self.fsrc, self.src_fft) vbox.Add (self.src_fft.win, 4, wx.EXPAND) if 1: post_filt_fft = fftsink.fft_sink_f (self, self.panel, title="Post Demod", fft_size=1024, sample_rate=demod_rate, y_per_div=10, ref_level=0) self.connect (self.guts.fm_demod, post_filt_fft) vbox.Add (post_filt_fft.win, 4, wx.EXPAND) if 0: post_deemph_fft = fftsink.fft_sink_f (self, self.panel, title="Post Deemph", fft_size=512, sample_rate=audio_rate, y_per_div=10, ref_level=-20) self.connect (self.guts.deemph, post_deemph_fft) vbox.Add (post_deemph_fft.win, 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_vol) hbox.Add((5,0), 1) if self.use_usrp_for_tuning: self.gain_range=self.subdev.gain_range() else: self.gain_range=(0,0,1) myform['gain'] = \ form.quantized_slider_field(parent=self.panel, sizer=hbox, label="Gain", weight=3, range=self.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 + .1e6) self.rot -= 3 elif self.rot <=-3: self.set_freq(self.freq - .1e6) self.rot += 3 else: step = self.volume_range()[2] if self.rot >= 3: self.set_vol(self.vol + step) self.rot -= 3 elif self.rot <=-3: self.set_vol(self.vol - 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_vol (self, vol): g = self.volume_range() self.vol = max(g[0], min(g[1], vol)) self.volume_control.set_k(10**(self.vol/10)) self.myform['volume'].set_value(self.vol) self.update_status_bar () 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. """ if self.use_usrp_for_tuning: r = usrp.tune(self.u, 0, self.subdev, 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 else: print "Not implemented yet" self._set_status_msg("Failed", 0) return False def set_gain(self, gain): self.myform['gain'].set_value(gain) # update displayed value if self.use_usrp_for_tuning: self.subdev.set_gain(gain) else: print "Not implemented yet" def update_status_bar (self): msg = "Volume:%r Setting:%s" % (self.vol, self.state) self._set_status_msg(msg, 1) self.src_fft.set_baseband_freq(self.freq) def volume_range(self): return (-20.0, 0.0, 0.5) if __name__ == '__main__': app = stdgui.stdapp (wfm_rx_graph, "CXADC WFM RX") app.MainLoop ()