git.gag.com Git - debian/gnuradio/blob - gnuradio-examples/python/multi-antenna/multi_fft.py

   1 #!/usr/bin/env python
   2
   3 from gnuradio import gr, gru, eng_notation
   4 from gnuradio import usrp
   5 from gnuradio.eng_option import eng_option
   6 from gnuradio import eng_notation
   7 from gnuradio import optfir
   8 from optparse import OptionParser
   9 from gnuradio.wxgui import stdgui, fftsink, waterfallsink, scopesink, form, slider
  10 import wx
  11 import usrp_dbid
  12 import time
  13 import os.path
  14 import sys
  15
  16 # required FPGA that can do 4 rx channels.
  17
  18
  19 class my_graph(stdgui.gui_flow_graph):
  20
  21     def __init__(self, frame, panel, vbox, argv):
  22         stdgui.gui_flow_graph.__init__(self)
  23
  24         self.frame = frame
  25         self.panel = panel
  26
  27         parser = OptionParser (option_class=eng_option)
  28         #parser.add_option("-S", "--subdev", type="subdev", default=(0, None),
  29         #                  help="select USRP Rx side A or B (default=A)")
  30         parser.add_option("-d", "--decim", type="int", default=128,
  31                           help="set fgpa decimation rate to DECIM [default=%default]")
  32         parser.add_option("-f", "--freq", type="eng_float", default=146.585e6,
  33                           help="set frequency to FREQ [default=%default])", metavar="FREQ")
  34         parser.add_option("-g", "--gain", type="eng_float", default=20,
  35                           help="set gain in dB [default=%default]")
  36         parser.add_option("-F", "--filter", action="store_true", default=True,
  37                           help="Enable channel filter")
  38         (options, args) = parser.parse_args()
  39
  40         if len(args) != 0:
  41             parser.print_help()
  42             raise SystemExit
  43
  44         nchan = 4
  45
  46         if options.filter:
  47             sw_decim = 4
  48         else:
  49             sw_decim = 1
  50
  51         self.u = usrp.source_c(0, options.decim, fpga_filename="std_4rx_0tx.rbf")
  52         if self.u.nddc() < nchan:
  53             sys.stderr.write('This code requires an FPGA build with %d DDCs.  This FPGA has only %d.\n' % (
  54                 nchan, self.u.nddc()))
  55             raise SystemExit
  56
  57         if not self.u.set_nchannels(nchan):
  58             sys.stderr.write('set_nchannels(%d) failed\n' % (nchan,))
  59             raise SystemExit
  60
  61         input_rate = self.u.adc_freq() / self.u.decim_rate()
  62         print "USB data rate   = %s" % (eng_notation.num_to_str(input_rate),)
  63         print "Scope data rate = %s" % (eng_notation.num_to_str(input_rate/sw_decim),)
  64
  65         self.subdev = self.u.db[0] + self.u.db[1]
  66
  67         if (len (self.subdev) != 4 or
  68             self.u.db[0][0].dbid() != usrp_dbid.BASIC_RX or
  69             self.u.db[1][0].dbid() != usrp_dbid.BASIC_RX):
  70             sys.stderr.write('This code requires a Basic Rx board on Sides A & B\n')
  71             sys.exit(1)
  72
  73         self.u.set_mux(gru.hexint(0xf3f2f1f0))
  74
  75         # deinterleave four channels from FPGA
  76         di = gr.deinterleave(gr.sizeof_gr_complex)
  77
  78         self.connect(self.u, di)
  79
  80
  81
  82         # taps for channel filter
  83         chan_filt_coeffs = optfir.low_pass (1,           # gain
  84                                             input_rate,  # sampling rate
  85                                             80e3,        # passband cutoff
  86                                             115e3,       # stopband cutoff
  87                                             0.1,         # passband ripple
  88                                             60)          # stopband attenuation
  89         #print len(chan_filt_coeffs)
  90
  91         for i in range(nchan):
  92             scope = fftsink.fft_sink_c(self, panel, sample_rate=input_rate/sw_decim,
  93                                        title="Input %d" % (i,),
  94                                        ref_level=80, y_per_div=20)
  95             vbox.Add(scope.win, 10, wx.EXPAND)
  96
  97             if options.filter:
  98                 chan_filt = gr.fir_filter_ccf(sw_decim, chan_filt_coeffs)
  99                 self.connect((di, i), chan_filt, scope)
 100             else:
 101                 self.connect((di, i), scope)
 102
 103
 104         self.set_gain(options.gain)
 105         self.set_freq(options.freq)
 106
 107     def set_gain(self, gain):
 108         for i in range(len(self.subdev)):
 109             self.subdev[i].set_gain(gain)
 110
 111     def set_freq(self, target_freq):
 112         ok = True
 113         for i in range(len(self.subdev)):
 114             r = usrp.tune(self.u, i, self.subdev[i], target_freq)
 115             if not r:
 116                 ok = False
 117                 print "set_freq: failed to set subdev[%d] freq to %f" % (
 118                     i, target_freq)
 119
 120         return ok
 121
 122
 123 def main ():
 124     app = stdgui.stdapp(my_graph, "Multi Scope", nstatus=1)
 125     app.MainLoop()
 126
 127 if __name__ == '__main__':
 128     main ()