#!/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 ()