diff options
Diffstat (limited to 'gr-uhd/examples/usrp_am_mw_rcv.py')
| -rwxr-xr-x | gr-uhd/examples/usrp_am_mw_rcv.py | 312 |
1 files changed, 312 insertions, 0 deletions
diff --git a/gr-uhd/examples/usrp_am_mw_rcv.py b/gr-uhd/examples/usrp_am_mw_rcv.py new file mode 100755 index 000000000..130bdcf56 --- /dev/null +++ b/gr-uhd/examples/usrp_am_mw_rcv.py @@ -0,0 +1,312 @@ +#!/usr/bin/env python +# +# Copyright 2005-2007,2011 Free Software Foundation, Inc. +# +# This file is part of GNU Radio +# +# GNU Radio is free software; you can redistribute it and/or modify +# it under the terms of the GNU General Public License as published by +# the Free Software Foundation; either version 3, or (at your option) +# any later version. +# +# GNU Radio is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +# GNU General Public License for more details. +# +# You should have received a copy of the GNU General Public License +# along with GNU Radio; see the file COPYING. If not, write to +# the Free Software Foundation, Inc., 51 Franklin Street, +# Boston, MA 02110-1301, USA. +# + +from gnuradio import gr, eng_notation, optfir +from gnuradio import audio +from gnuradio import uhd +from gnuradio import blks2 +from gnuradio.eng_option import eng_option +from gnuradio.wxgui import slider, powermate +from gnuradio.wxgui import stdgui2, fftsink2, form +from optparse import OptionParser +from usrpm import usrp_dbid +import sys +import math +import wx + +class wfm_rx_block (stdgui2.std_top_block): + def __init__(self, frame, panel, vbox, argv): + stdgui2.std_top_block.__init__ (self, frame, panel, vbox, argv) + + parser=OptionParser(option_class=eng_option) + parser.add_option("-a", "--address", type="string", + default="addr=192.168.10.2", + help="Address of UHD device, [default=%default]") + parser.add_option("-A", "--antenna", type="string", default=None, + help="select Rx Antenna where appropriate") + parser.add_option("-s", "--samp-rate", type="eng_float", default=1e6, + help="set sample rate (bandwidth) [default=%default]") + parser.add_option("-f", "--freq", type="eng_float", default=1008.0e3, + help="set frequency to FREQ", metavar="FREQ") + parser.add_option("-I", "--use-if-freq", action="store_true", default=False, + help="use intermediate freq (compensates DC problems in quadrature boards)" ) + parser.add_option("-g", "--gain", type="eng_float", default=None, + help="set gain in dB (default is maximum)") + 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") + + (options, args) = parser.parse_args() + if len(args) != 0: + parser.print_help() + sys.exit(1) + + self.frame = frame + self.panel = panel + self.use_IF=options.use_if_freq + if self.use_IF: + self.IF_freq=64000.0 + else: + self.IF_freq=0.0 + + self.vol = 0 + self.state = "FREQ" + self.freq = 0 + + # build graph + self.u = uhd.usrp_source(device_addr=options.address, + io_type=uhd.io_type.COMPLEX_FLOAT32, + num_channels=1) + + usrp_rate = 256e3 + demod_rate = 64e3 + audio_rate = 32e3 + chanfilt_decim = int(usrp_rate // demod_rate) + audio_decim = int(demod_rate // audio_rate) + + self.u.set_samp_rate(usrp_rate) + dev_rate = self.u.get_samp_rate() + + # Resample signal to exactly self.usrp_rate + # FIXME: make one of the follow-on filters an arb resampler + rrate = usrp_rate / dev_rate + self.resamp = blks2.pfb_arb_resampler_ccf(rrate) + + chan_filt_coeffs = gr.firdes.low_pass_2 (1, # gain + usrp_rate, # sampling rate + 8e3, # passband cutoff + 4e3, # transition bw + 60) # stopband attenuation + + if self.use_IF: + # Turn If to baseband and filter. + self.chan_filt = gr.freq_xlating_fir_filter_ccf (chanfilt_decim, + chan_filt_coeffs, + self.IF_freq, + usrp_rate) + else: + self.chan_filt = gr.fir_filter_ccf (chanfilt_decim, chan_filt_coeffs) + + self.agc = gr.agc_cc(0.1, 1, 1, 100000) + self.am_demod = gr.complex_to_mag() + self.volume_control = gr.multiply_const_ff(self.vol) + + audio_filt_coeffs = gr.firdes.low_pass_2 (1, # gain + demod_rate, # sampling rate + 8e3, # passband cutoff + 2e3, # transition bw + 60) # stopband attenuation + self.audio_filt=gr.fir_filter_fff(audio_decim, audio_filt_coeffs) + + # sound card as final sink + self.audio_sink = audio.sink (int (audio_rate), + options.audio_output, + False) # ok_to_block + + # now wire it all together + self.connect (self.u, self.resamp, self.chan_filt, self.agc, + self.am_demod, self.audio_filt, + self.volume_control, self.audio_sink) + + self._build_gui(vbox, usrp_rate, demod_rate, audio_rate) + + if options.gain is None: + g = self.u.get_gain_range() + if True: + # if no gain was specified, use the mid gain + options.gain = (g.start() + g.stop())/2.0 + options.gain = g.stop() + + if options.volume is None: + v = self.volume_range() + options.volume = float(v[0]*3+v[1])/4.0 + + if abs(options.freq) < 1e3: + options.freq *= 1e3 + + # 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") + + if(options.antenna): + self.u.set_antenna(options.antenna, 0) + + def _set_status_msg(self, msg, which=0): + self.frame.GetStatusBar().SetStatusText(msg, which) + + + def _build_gui(self, vbox, usrp_rate, demod_rate, audio_rate): + + def _form_set_freq(kv): + return self.set_freq(kv['freq']) + + + if 0: + self.src_fft = fftsink2.fft_sink_c(self.panel, title="Data from USRP", + fft_size=512, sample_rate=usrp_rate, + ref_scale=32768.0, ref_level=0.0, y_divs=12) + self.connect (self.u, self.src_fft) + vbox.Add (self.src_fft.win, 4, wx.EXPAND) + + if 0: + self.post_filt_fft = fftsink2.fft_sink_c(self.panel, title="Post Channel filter", + fft_size=512, sample_rate=demod_rate) + self.connect (self.chan_filt, self.post_filt_fft) + vbox.Add (self.post_filt_fft.win, 4, wx.EXPAND) + + if 0: + post_demod_fft = fftsink2.fft_sink_f(self.panel, title="Post Demod", + fft_size=1024, sample_rate=demod_rate, + y_per_div=10, ref_level=0) + self.connect (self.am_demod, post_demod_fft) + vbox.Add (post_demod_fft.win, 4, wx.EXPAND) + + if 1: + audio_fft = fftsink2.fft_sink_f(self.panel, title="Audio", + fft_size=512, sample_rate=audio_rate, + y_per_div=10, ref_level=20) + self.connect (self.audio_filt, audio_fft) + vbox.Add (audio_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=(520.0e3, 1611.0e3, 1.0e3), + 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) + + g = self.u.get_gain_range() + myform['gain'] = \ + form.quantized_slider_field(parent=self.panel, sizer=hbox, label="Gain", + weight=3, range=(g.start(), g.stop(), g.step()), + 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 + """ + r = self.u.set_center_freq(target_freq + self.IF_freq, 0) + + 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.u.set_gain(gain) + + def update_status_bar (self): + msg = "Volume:%r Setting:%s" % (self.vol, self.state) + self._set_status_msg(msg, 1) + try: + self.src_fft.set_baseband_freq(self.freq) + except: + None + + def volume_range(self): + return (-40.0, 0.0, 0.5) + + +if __name__ == '__main__': + app = stdgui2.stdapp (wfm_rx_block, "USRP Broadcast AM MW RX") + app.MainLoop () |