diff options
| author | jcorgan <jcorgan@221aa14e-8319-0410-a670-987f0aec2ac5> | 2006-08-03 04:51:51 +0000 |
|---|---|---|
| committer | jcorgan <jcorgan@221aa14e-8319-0410-a670-987f0aec2ac5> | 2006-08-03 04:51:51 +0000 |
| commit | 5d69a524f81f234b3fbc41d49ba18d6f6886baba (patch) | |
| tree | b71312bf7f1e8d10fef0f3ac6f28784065e73e72 /gnuradio-examples/python/usrp/usrp_wfm_rcv_nogui.py | |
Houston, we have a trunk.
git-svn-id: http://gnuradio.org/svn/gnuradio/trunk@3122 221aa14e-8319-0410-a670-987f0aec2ac5
Diffstat (limited to 'gnuradio-examples/python/usrp/usrp_wfm_rcv_nogui.py')
| -rwxr-xr-x | gnuradio-examples/python/usrp/usrp_wfm_rcv_nogui.py | 153 |
1 files changed, 153 insertions, 0 deletions
diff --git a/gnuradio-examples/python/usrp/usrp_wfm_rcv_nogui.py b/gnuradio-examples/python/usrp/usrp_wfm_rcv_nogui.py new file mode 100755 index 0000000000..69f810bba9 --- /dev/null +++ b/gnuradio-examples/python/usrp/usrp_wfm_rcv_nogui.py @@ -0,0 +1,153 @@ +#!/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 optparse import OptionParser +import usrp_dbid +import sys +import math + +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 (gr.flow_graph): + + def __init__(self): + gr.flow_graph.__init__(self) + + 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("-g", "--gain", type="eng_float", default=None, + help="set gain in dB (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") + + (options, args) = parser.parse_args() + if len(args) != 0: + parser.print_help() + sys.exit(1) + + self.vol = .1 + self.state = "FREQ" + self.freq = 0 + + # build graph + + self.u = usrp.source_c() # usrp is data source + + adc_rate = self.u.adc_rate() # 64 MS/s + usrp_decim = 200 + self.u.set_decim_rate(usrp_decim) + usrp_rate = adc_rate / usrp_decim # 320 kS/s + chanfilt_decim = 1 + demod_rate = usrp_rate / chanfilt_decim + audio_decimation = 10 + audio_rate = demod_rate / audio_decimation # 32 kHz + + + if options.rx_subdev_spec is None: + options.rx_subdev_spec = pick_subdevice(self.u) + + self.u.set_mux(usrp.determine_rx_mux_value(self.u, options.rx_subdev_spec)) + 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 + usrp_rate, # sampling rate + 80e3, # passband cutoff + 115e3, # stopband cutoff + 0.1, # passband ripple + 60) # stopband attenuation + #print len(chan_filt_coeffs) + chan_filt = gr.fir_filter_ccf (chanfilt_decim, chan_filt_coeffs) + + 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.u, chan_filt, self.guts, self.volume_control, audio_sink) + + + if options.gain is None: + # if no gain was specified, use the mid-point in dB + g = self.subdev.gain_range() + options.gain = float(g[0]+g[1])/2 + + if abs(options.freq) < 1e6: + options.freq *= 1e6 + + # set initial values + + self.set_gain(options.gain) + + if not(self.set_freq(options.freq)): + self._set_status_msg("Failed to set initial frequency") + + def set_vol (self, vol): + self.vol = vol + self.volume_control.set_k(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. + """ + r = self.u.tune(0, self.subdev, target_freq) + + if r: + self.freq = target_freq + 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.subdev.set_gain(gain) + + def update_status_bar (self): + msg = "Freq: %s Volume:%f Setting:%s" % ( + eng_notation.num_to_str(self.freq), self.vol, self.state) + self._set_status_msg(msg, 1) + + def _set_status_msg(self, msg, which=0): + print msg + + +if __name__ == '__main__': + fg = wfm_rx_graph() + try: + fg.run() + except KeyboardInterrupt: + pass |