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
---
.../python/usrp/usrp_wfm_rcv_nogui.py | 153 +++++++++++++++++++++
1 file changed, 153 insertions(+)
create mode 100755 gnuradio-examples/python/usrp/usrp_wfm_rcv_nogui.py
(limited to 'gnuradio-examples/python/usrp/usrp_wfm_rcv_nogui.py')
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
--
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