git.gag.com Git - debian/gnuradio/blob - gnuradio-examples/python/multi-antenna/multi_file.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(gr.flow_graph):
  20
  21     def __init__(self):
  22         gr.flow_graph.__init__(self)
  23
  24         parser = OptionParser (option_class=eng_option)
  25         #parser.add_option("-S", "--subdev", type="subdev", default=(0, None),
  26         #                  help="select USRP Rx side A or B (default=A)")
  27         parser.add_option("-d", "--decim", type="int", default=128,
  28                           help="set fgpa decimation rate to DECIM [default=%default]")
  29         parser.add_option("-f", "--freq", type="eng_float", default=146.585e6,
  30                           help="set frequency to FREQ [default=%default])", metavar="FREQ")
  31         parser.add_option("-g", "--gain", type="eng_float", default=20,
  32                           help="set gain in dB [default=%default]")
  33         parser.add_option("-F", "--filter", action="store_true", default=True,
  34                           help="Enable channel filter")
  35         parser.add_option("-o", "--output", type="string", default=None,
  36                           help="set output basename")
  37         (options, args) = parser.parse_args()
  38
  39         if len(args) != 0:
  40             parser.print_help()
  41             raise SystemExit
  42
  43         if options.output is None:
  44             parser.print_help()
  45             sys.stderr.write("You must provide an output filename base with -o OUTPUT\n")
  46             raise SystemExit
  47         else:
  48             basename = options.output
  49
  50         nchan = 4
  51         nsecs = 4.0
  52
  53         if options.filter:
  54             sw_decim = 4
  55         else:
  56             sw_decim = 1
  57
  58         self.u = usrp.source_c(0, options.decim, fpga_filename="std_4rx_0tx.rbf")
  59         if self.u.nddc() < nchan:
  60             sys.stderr.write('This code requires an FPGA build with %d DDCs.  This FPGA has only %d.\n' % (
  61                 nchan, self.u.nddc()))
  62             raise SystemExit
  63
  64         if not self.u.set_nchannels(nchan):
  65             sys.stderr.write('set_nchannels(%d) failed\n' % (nchan,))
  66             raise SystemExit
  67
  68         input_rate = self.u.adc_freq() / self.u.decim_rate()
  69         print "USB data rate   = %s" % (eng_notation.num_to_str(input_rate),)
  70         sink_data_rate = input_rate/sw_decim
  71         print "Scope data rate = %s" % (eng_notation.num_to_str(sink_data_rate),)
  72
  73         self.subdev = self.u.db[0] + self.u.db[1]
  74
  75         if (len(self.subdev) != 4 or
  76             self.u.db[0][0].dbid() != usrp_dbid.BASIC_RX or
  77             self.u.db[1][0].dbid() != usrp_dbid.BASIC_RX):
  78             sys.stderr.write('This code requires a Basic Rx board on Sides A & B\n')
  79             sys.exit(1)
  80
  81         self.u.set_mux(gru.hexint(0xf3f2f1f0))
  82
  83         # collect 1 second worth of data
  84         limit = int(nsecs * input_rate * nchan)
  85         print "limit = ", limit
  86         head = gr.head(gr.sizeof_gr_complex, limit)
  87
  88         # deinterleave four channels from FPGA
  89         di = gr.deinterleave(gr.sizeof_gr_complex)
  90
  91         self.connect(self.u, head, di)
  92
  93         # taps for channel filter
  94         chan_filt_coeffs = optfir.low_pass (1,           # gain
  95                                             input_rate,  # sampling rate
  96                                             80e3,        # passband cutoff
  97                                             115e3,       # stopband cutoff
  98                                             0.1,         # passband ripple
  99                                             60)          # stopband attenuation
 100         #print len(chan_filt_coeffs)
 101
 102         for i in range(nchan):
 103
 104             sink = gr.file_sink(gr.sizeof_gr_complex,
 105                                 basename + ("-%s-%d.dat" % (eng_notation.num_to_str(sink_data_rate), i)))
 106             if options.filter:
 107                 chan_filt = gr.fir_filter_ccf(sw_decim, chan_filt_coeffs)
 108                 self.connect((di, i), chan_filt, sink)
 109             else:
 110                 self.connect((di, i), sink)
 111
 112
 113         self.set_gain(options.gain)
 114         self.set_freq(options.freq)
 115
 116     def set_gain(self, gain):
 117         for i in range(len(self.subdev)):
 118             self.subdev[i].set_gain(gain)
 119
 120     def set_freq(self, target_freq):
 121         ok = True
 122         for i in range(len(self.subdev)):
 123             r = usrp.tune(self.u, i, self.subdev[i], target_freq)
 124             if not r:
 125                 ok = False
 126                 print "set_freq: failed to set subdev[%d] freq to %f" % (
 127                     i, target_freq)
 128
 129         return ok
 130
 131
 132 def main ():
 133     my_graph().run()
 134
 135 if __name__ == '__main__':
 136     main ()