def __init__(self, options):
        gr.top_block.__init__(self)

	# Create a USRP source with GPIO FPGA build, then configure
        u = usrp.source_s(decim_rate=options.decim,fpga_filename=gpio.fpga_filename)

        if options.force_complex_RXA:
           # This is a dirty hack to force complex mode (receive both I and Q) on basicRX or LFRX
           # This forces the receive board in RXA (side A) to be used 
           # FIXME: This has as a side effect that the gain for Q is not set. So only use with gain 0 (--gain 0)
           options.rx_subdev_spec=(0,0)
           u.set_mux(0x10)
           if not (0==options.gain):
             print "WARNING, you should set the gain to 0 with --gain 0 when using --force-complex-RXA"
             print "The gain for Q will now still be zero while the gain for I is not" 
             #options.gain=0
        else:
          if options.rx_subdev_spec is None:
            options.rx_subdev_spec = usrp.pick_rx_subdevice(u)
          u.set_mux(usrp.determine_rx_mux_value(u, options.rx_subdev_spec))

        subdev = usrp.selected_subdev(u, options.rx_subdev_spec)
        print "Using RX d'board %s" % (subdev.side_and_name(),)
        input_rate = u.adc_freq()/u.decim_rate()
        print "USB sample rate %s" % (eng_notation.num_to_str(input_rate))

        if options.gain is None:
            # if no gain was specified, use the mid-point in dB
            g = subdev.gain_range()
            options.gain = float(g[0]+g[1])/2


        #TODO setting gain on basicRX only sets the I channel, use a second subdev to set gain of Q channel
        #see gnuradio-examples/multi-antenna for possible solutions
        subdev.set_gain(options.gain)

        #TODO check if freq has same problem as gain when trying to use complex mode on basicRX
        r = u.tune(0, subdev, options.freq)
        if not r:
            sys.stderr.write('Failed to set frequency\n')
            raise SystemExit, 1

	# Connect pipeline
	src = u
	if options.nsamples is not None:
	    head = gr.head(gr.sizeof_short, int(options.nsamples)*2)
	    self.connect(u, head)
	    src = head

	ana_strip = gpio.and_const_ss(0xFFFE)
	dig_strip = gpio.and_const_ss(0x0001)
        ana_sink = gr.file_sink(gr.sizeof_short, options.ana_filename)
	dig_sink = gr.file_sink(gr.sizeof_short, options.dig_filename)
    
	self.connect(src, ana_strip, ana_sink)
	self.connect(src, dig_strip, dig_sink)
    def __init__(self, frame, panel, vbox, argv):
        stdgui2.std_top_block.__init__(self, frame, panel, vbox, argv)

        self.frame = frame
        self.panel = panel
        
        parser = OptionParser(option_class=eng_option)
        parser.add_option("-w", "--which", type="int", default=0,
                          help="select which USRP (0, 1, ...) default is %default",
			  metavar="NUM")
#        parser.add_option("-R", "--rx-subdev-spec", type="subdev", default=None,
#                          help="select USRP Rx side A or B (default=first one with a daughterboard)")
        parser.add_option("-A", "--antenna", default=None,
                          help="select Rx Antenna (only on RFX-series boards)")
        parser.add_option("-d", "--decim", type="int", default=32,
                          help="set fgpa decimation rate to DECIM [default=%default]")
        parser.add_option("-f", "--freq", type="eng_float", default=0.0,
                          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("-W", "--waterfall", action="store_true", default=False,
                          help="Enable waterfall display")
        parser.add_option("-8", "--width-8", action="store_true", default=False,
                          help="Enable 8-bit samples across USB")
#        parser.add_option( "--no-hb", action="store_true", default=False,
#                          help="don't use halfband filter in usrp")
        parser.add_option("-S", "--oscilloscope", action="store_true", default=False,
                          help="Enable oscilloscope display (default)")
        parser.add_option("-F", "--fft", action="store_true", default=False,
                          help="Enable FFT display")
        parser.add_option("-n", "--frame-decim", type="int", default=1,
                          help="set oscope frame decimation factor to n [default=1]")
        parser.add_option("-v", "--v-scale", type="eng_float", default=1,
                          help="set oscope initial V/div to SCALE [default=%default]")
        parser.add_option("-t", "--t-scale", type="eng_float", default=10e-6,
                          help="set oscope initial s/div to SCALE [default=10us]")
        parser.add_option ("--digital", action="store_true", default=False, 
                       help="show (only) the digital wave on lsb (will be input from gpio pins with special usrp firmware)")
        parser.add_option ("--analog", action="store_true", default=False, 
                       help="show (only) the analog wave on msbs (will be input from analog inputs)")
        parser.add_option ("--file",  default=None, 
                       help="input from file FILE in stead of USRP (will be input from raw file in interleaved short format)")
        (options, args) = parser.parse_args()
        if len(args) != 0:
            parser.print_help()
            sys.exit(1)
	self.options = options
        self.show_debug_info = True

        self.u = usrp.source_s(which=options.which, decim_rate=options.decim, fpga_filename=gpio.fpga_filename)

        print "Warning: This script only supports boards on RXA, change the script if you want otherwise"
        #options.rx_subdev_spec=(0, 0)#force the use of RXA 
        options.rx_subdev_spec=None   #force the use of RXA      

        if options.rx_subdev_spec is None:
            options.rx_subdev_spec = pick_subdevice(self.u)

        #This hardcoded mux setting is why this script only supports RXA
        #We want both I and Q active, even when using basicRX
        #set to 0x10 for RXA
        #set to 0x32 for RXB
        self.u.set_mux(0x10) #usrp.determine_rx_mux_value(self.u, options.rx_subdev_spec))

        if options.width_8:
            width = 8
            shift = 8
            format = self.u.make_format(width, shift)
            print "format =", hex(format)
            r = self.u.set_format(format)
            print "set_format =", r
            
        # determine the daughterboard subdevice we're using
        self.subdev = usrp.selected_subdev(self.u, options.rx_subdev_spec)
        #if options.rx_subdev_spec==(0,0):
        #  rx_subdev_spec2=(0,1)
        #  self.subdev2 = usrp.selected_subdev(self.u, rx_subdev_spec2)
        input_rate = self.u.adc_freq() / self.u.decim_rate()

        if options.waterfall:
            self.scope = \
              waterfallsink2.waterfall_sink_c (panel, fft_size=1024, sample_rate=input_rate)
        elif options.fft:
            self.scope = fftsink2.fft_sink_c (panel, fft_size=1024, sample_rate=input_rate)
        else: # options.oscilloscope:
            #self.scope = scopesink2.scope_sink_c(panel, sample_rate=input_rate)
            self.scope = scopesink2.scope_sink_c(panel, sample_rate=input_rate,
                                            frame_decim=options.frame_decim,
                                            v_scale=options.v_scale,
                                            t_scale=options.t_scale)

        self.is2c = gr.interleaved_short_to_complex()
        if not (options.file is None):
          self.filesrc=gr.file_source(gr.sizeof_short, options.file, True)
          thr = gr.throttle(gr.sizeof_short, input_rate)
          self.connect(self.filesrc,thr,self.is2c,self.scope)
        elif options.digital:
          self.select_dig=gpio.and_const_ss(0x0001)
          self.connect(self.u, self.select_dig,self.is2c,self.scope)
        elif options.analog:
          self.select_ana=gpio.and_const_ss(0xFFFE)
          self.connect(self.u, self.select_ana,self.is2c,self.scope)
        else:
          self.connect(self.u,self.is2c,self.scope)

        self._build_gui(vbox)
	self._setup_events()
	
        # set initial values

        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 options.freq is None:
            # if no freq was specified, use the mid-point
            r = self.subdev.freq_range()
            options.freq = float(r[0]+r[1])/2

        self.set_gain(options.gain)

	if options.antenna is not None:
            print "Selecting antenna %s" % (options.antenna,)
            self.subdev.select_rx_antenna(options.antenna)

        if self.show_debug_info:
            self.myform['decim'].set_value(self.u.decim_rate())
            self.myform['fs@usb'].set_value(self.u.adc_freq() / self.u.decim_rate())
            self.myform['dbname'].set_value(self.subdev.name())
            self.myform['baseband'].set_value(0)
            self.myform['ddc'].set_value(0)

        if not(self.set_freq(options.freq)):
            self._set_status_msg("Failed to set initial frequency")