#!/usr/bin/env python # # Copyright 2005,2006,2007 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, gru, eng_notation, optfir from gnuradio import audio from gnuradio import usrp 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 def pick_subdevice(u): """ The user didn't specify a subdevice on the command line. Try for one of these, in order: BASIC_RX,TV_RX, BASIC_RX, whatever is on side A. @return a subdev_spec """ return usrp.pick_subdev(u, (usrp_dbid.BASIC_RX, usrp_dbid.LF_RX, usrp_dbid.TV_RX, usrp_dbid.TV_RX_REV_2, usrp_dbid.TV_RX_REV_3, usrp_dbid.TV_RX_MIMO, usrp_dbid.TV_RX_REV_2_MIMO, usrp_dbid.TV_RX_REV_3_MIMO)) 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("-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=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 #TODO: add an AGC after the channel filter and before the AM_demod self.u = usrp.source_c() # usrp is data source adc_rate = self.u.adc_rate() # 64 MS/s usrp_decim = 250 self.u.set_decim_rate(usrp_decim) usrp_rate = adc_rate / usrp_decim # 256 kS/s chanfilt_decim = 4 demod_rate = usrp_rate / chanfilt_decim # 64 kHz audio_decimation = 2 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 8e3, # passband cutoff 12e3, # stopband cutoff 1.0, # passband ripple 60) # stopband attenuation #print len(chan_filt_coeffs) self.chan_filt = gr.fir_filter_ccf (chanfilt_decim, chan_filt_coeffs) 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.am_demod = gr.complex_to_mag() self.volume_control = gr.multiply_const_ff(self.vol) audio_filt_coeffs = optfir.low_pass (1, # gain demod_rate, # sampling rate 8e3, # passband cutoff 10e3, # stopband cutoff 0.1, # passband ripple 60) # stopband attenuation self.audio_filt=gr.fir_filter_fff(audio_decimation,audio_filt_coeffs) # 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, self.chan_filt, self.am_demod, self.audio_filt, self.volume_control, audio_sink) self._build_gui(vbox, usrp_rate, demod_rate, audio_rate) if options.gain is None: g = self.subdev.gain_range() if True: # if no gain was specified, use the maximum gain available # (usefull for Basic_RX which is relatively deaf and the most probable board to be used for AM) # TODO: check db type to decide on default gain. options.gain = float(g[1]) else: # if no gain was specified, use the mid-point in dB options.gain = float(g[0]+g[1])/2 if options.volume is None: g = self.volume_range() options.volume = float(g[0]*3+g[1])/4 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") 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 1: 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) myform['gain'] = \ form.quantized_slider_field(parent=self.panel, sizer=hbox, label="Gain", weight=3, range=self.subdev.gain_range(), 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 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 = usrp.tune(self.u, 0, self.subdev, target_freq + self.IF_freq) #TODO: check if db is inverting the spectrum or not to decide if we should do + self.IF_freq or - self.IF_freq 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.subdev.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 ()