3 # Copyright 2005,2006,2007,2008,2009 Free Software Foundation, Inc.
5 # This file is part of GNU Radio
7 # GNU Radio is free software; you can redistribute it and/or modify
8 # it under the terms of the GNU General Public License as published by
9 # the Free Software Foundation; either version 3, or (at your option)
12 # GNU Radio is distributed in the hope that it will be useful,
13 # but WITHOUT ANY WARRANTY; without even the implied warranty of
14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 # GNU General Public License for more details.
17 # You should have received a copy of the GNU General Public License
18 # along with GNU Radio; see the file COPYING. If not, write to
19 # the Free Software Foundation, Inc., 51 Franklin Street,
20 # Boston, MA 02110-1301, USA.
23 from gnuradio import gr, gru, eng_notation, optfir
24 from gnuradio import audio
25 from gnuradio import usrp2
26 from gnuradio import blks2
27 from gnuradio.eng_option import eng_option
28 from gnuradio.wxgui import slider, powermate
29 from gnuradio.wxgui import stdgui2, fftsink2, form
30 from optparse import OptionParser
35 class wfm_rx_block (stdgui2.std_top_block):
36 def __init__(self,frame,panel,vbox,argv):
37 stdgui2.std_top_block.__init__ (self,frame,panel,vbox,argv)
39 parser = OptionParser(option_class=eng_option)
40 parser.add_option("-e", "--interface", type="string", default="eth0",
41 help="select Ethernet interface, default is eth0")
42 parser.add_option("-m", "--mac-addr", type="string", default="",
43 help="select USRP by MAC address, default is auto-select")
44 #parser.add_option("-A", "--antenna", default=None,
45 # help="select Rx Antenna (only on RFX-series boards)")
46 parser.add_option("-f", "--freq", type="eng_float", default=100.1,
47 help="set frequency to FREQ", metavar="FREQ")
48 parser.add_option("-g", "--gain", type="eng_float", default=None,
49 help="set gain in dB (default is midpoint)")
50 parser.add_option("-V", "--volume", type="eng_float", default=None,
51 help="set volume (default is midpoint)")
52 parser.add_option("-O", "--audio-output", type="string", default="",
53 help="pcm device name. E.g., hw:0,0 or surround51 or /dev/dsp")
55 (options, args) = parser.parse_args()
69 self.u = usrp2.source_32fc(options.interface, options.mac_addr)
71 adc_rate = self.u.adc_rate() # 100 MS/s
73 self.u.set_decim(usrp_decim)
74 usrp_rate = adc_rate / usrp_decim # ~320 kS/s
76 demod_rate = usrp_rate / chanfilt_decim
78 audio_rate = demod_rate / audio_decimation # ~32 kHz
80 #FIXME: need named constants and text descriptions available to (gr-)usrp2 even
81 #when usrp(1) module is not built. A usrp_common module, perhaps?
82 dbid = self.u.daughterboard_id()
83 print "Using RX d'board 0x%04X" % (dbid,)
84 if not (dbid == 0x0001 or #usrp_dbid.BASIC_RX
85 dbid == 0x0003 or #usrp_dbid.TV_RX
86 dbid == 0x000c or #usrp_dbid.TV_RX_REV_2
87 dbid == 0x0040): #usrp_dbid.TV_RX_REV_3
88 print "This daughterboard does not cover the required frequency range"
89 print "for this application. Please use a BasicRX or TVRX daughterboard."
90 raw_input("Press ENTER to continue anyway, or Ctrl-C to exit.")
92 chan_filt_coeffs = optfir.low_pass (1, # gain
93 usrp_rate, # sampling rate
94 80e3, # passband cutoff
95 115e3, # stopband cutoff
96 0.1, # passband ripple
97 60) # stopband attenuation
98 #print len(chan_filt_coeffs)
99 chan_filt = gr.fir_filter_ccf (chanfilt_decim, chan_filt_coeffs)
101 self.guts = blks2.wfm_rcv (demod_rate, audio_decimation)
103 self.volume_control = gr.multiply_const_ff(self.vol)
105 # sound card as final sink
106 audio_sink = audio.sink (int (audio_rate),
107 options.audio_output,
110 # now wire it all together
111 self.connect (self.u, chan_filt, self.guts, self.volume_control, audio_sink)
113 self._build_gui(vbox, usrp_rate, demod_rate, audio_rate)
115 if options.gain is None:
116 # if no gain was specified, use the mid-point in dB
117 g = self.u.gain_range()
118 options.gain = float(g[0]+g[1])/2
120 if options.volume is None:
121 g = self.volume_range()
122 options.volume = float(g[0]+g[1])/2
124 if abs(options.freq) < 1e6:
129 self.set_gain(options.gain)
130 self.set_vol(options.volume)
131 if not(self.set_freq(options.freq)):
132 self._set_status_msg("Failed to set initial frequency")
135 def _set_status_msg(self, msg, which=0):
136 self.frame.GetStatusBar().SetStatusText(msg, which)
139 def _build_gui(self, vbox, usrp_rate, demod_rate, audio_rate):
141 def _form_set_freq(kv):
142 return self.set_freq(kv['freq'])
146 self.src_fft = fftsink2.fft_sink_c(self.panel, title="Data from USRP2",
147 fft_size=512, sample_rate=usrp_rate,
148 ref_scale=1.0, ref_level=0, y_divs=12)
149 self.connect (self.u, self.src_fft)
150 vbox.Add (self.src_fft.win, 4, wx.EXPAND)
153 post_filt_fft = fftsink2.fft_sink_f(self.panel, title="Post Demod",
154 fft_size=1024, sample_rate=usrp_rate,
155 y_per_div=10, ref_level=0)
156 self.connect (self.guts.fm_demod, post_filt_fft)
157 vbox.Add (post_filt_fft.win, 4, wx.EXPAND)
160 post_deemph_fft = fftsink2.fft_sink_f(self.panel, title="Post Deemph",
161 fft_size=512, sample_rate=audio_rate,
162 y_per_div=10, ref_level=-20)
163 self.connect (self.guts.deemph, post_deemph_fft)
164 vbox.Add (post_deemph_fft.win, 4, wx.EXPAND)
167 # control area form at bottom
168 self.myform = myform = form.form()
170 hbox = wx.BoxSizer(wx.HORIZONTAL)
172 myform['freq'] = form.float_field(
173 parent=self.panel, sizer=hbox, label="Freq", weight=1,
174 callback=myform.check_input_and_call(_form_set_freq, self._set_status_msg))
177 myform['freq_slider'] = \
178 form.quantized_slider_field(parent=self.panel, sizer=hbox, weight=3,
179 range=(87.9e6, 108.1e6, 0.1e6),
180 callback=self.set_freq)
182 vbox.Add(hbox, 0, wx.EXPAND)
184 hbox = wx.BoxSizer(wx.HORIZONTAL)
188 form.quantized_slider_field(parent=self.panel, sizer=hbox, label="Volume",
189 weight=3, range=self.volume_range(),
190 callback=self.set_vol)
194 form.quantized_slider_field(parent=self.panel, sizer=hbox, label="Gain",
195 weight=3, range=self.u.gain_range(),
196 callback=self.set_gain)
198 vbox.Add(hbox, 0, wx.EXPAND)
201 self.knob = powermate.powermate(self.frame)
203 powermate.EVT_POWERMATE_ROTATE (self.frame, self.on_rotate)
204 powermate.EVT_POWERMATE_BUTTON (self.frame, self.on_button)
207 #print "FYI: No Powermate or Contour Knob found"
210 def on_rotate (self, event):
211 self.rot += event.delta
212 if (self.state == "FREQ"):
214 self.set_freq(self.freq + .1e6)
217 self.set_freq(self.freq - .1e6)
220 step = self.volume_range()[2]
222 self.set_vol(self.vol + step)
225 self.set_vol(self.vol - step)
228 def on_button (self, event):
229 if event.value == 0: # button up
232 if self.state == "FREQ":
236 self.update_status_bar ()
239 def set_vol (self, vol):
240 g = self.volume_range()
241 self.vol = max(g[0], min(g[1], vol))
242 self.volume_control.set_k(10**(self.vol/10))
243 self.myform['volume'].set_value(self.vol)
244 self.update_status_bar ()
246 def set_freq(self, target_freq):
248 Set the center frequency we're interested in.
250 @param target_freq: frequency in Hz
253 Tuning is a two step process. First we ask the front-end to
254 tune as close to the desired frequency as it can. Then we use
255 the result of that operation and our target_frequency to
256 determine the value for the digital down converter.
258 r = self.u.set_center_freq(target_freq)
260 self.freq = target_freq
261 self.myform['freq'].set_value(target_freq) # update displayed value
262 self.myform['freq_slider'].set_value(target_freq) # update displayed value
263 self.update_status_bar()
264 self._set_status_msg("OK", 0)
267 self._set_status_msg("Failed", 0)
270 def set_gain(self, gain):
271 self.myform['gain'].set_value(gain) # update displayed value
272 self.u.set_gain(gain)
274 def update_status_bar (self):
275 msg = "Volume:%r Setting:%s" % (self.vol, self.state)
276 self._set_status_msg(msg, 1)
277 self.src_fft.set_baseband_freq(self.freq)
279 def volume_range(self):
280 return (-20.0, 0.0, 0.5)
283 if __name__ == '__main__':
284 app = stdgui2.stdapp (wfm_rx_block, "USRP2 WFM RX")