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-rwxr-xr-xgsm-receiver/src/python/gsm_receive_usrp2.py148
1 files changed, 148 insertions, 0 deletions
diff --git a/gsm-receiver/src/python/gsm_receive_usrp2.py b/gsm-receiver/src/python/gsm_receive_usrp2.py
new file mode 100755
index 0000000..a5ca75e
--- /dev/null
+++ b/gsm-receiver/src/python/gsm_receive_usrp2.py
@@ -0,0 +1,148 @@
+#!/usr/bin/env python
+#this file isn't ready to use now - gsm-receiver lacks realtime processing capability
+#there are many underruns of buffer for samples from usrp's, many blocks of samples get lost and
+#receiver isn't prepared for this situation too well
+
+from gnuradio import gr, gru, blks2
+#, gsm
+from gnuradio import usrp2
+from gnuradio.eng_option import eng_option
+from optparse import OptionParser
+from os import sys
+
+for extdir in ['../../debug/src/lib','../../debug/src/lib/.libs','../lib','../lib/.libs']:
+ if extdir not in sys.path:
+ sys.path.append(extdir)
+import gsm
+
+def pick_subdevice(u):
+ if u.db[0][0].dbid() >= 0:
+ return (0, 0)
+ if u.db[1][0].dbid() >= 0:
+ return (1, 0)
+ return (0, 0)
+
+class tuner(gr.feval_dd):
+ def __init__(self, top_block):
+ gr.feval_dd.__init__(self)
+ self.top_block = top_block
+ def eval(self, freq_offet):
+ self.top_block.set_center_frequency(freq_offet)
+ return freq_offet
+
+class synchronizer(gr.feval_dd):
+ def __init__(self, top_block):
+ gr.feval_dd.__init__(self)
+ self.top_block = top_block
+
+ def eval(self, timing_offset):
+ self.top_block.set_timing(timing_offset)
+ return freq_offet
+
+class gsm_receiver_first_blood(gr.top_block):
+ def __init__(self):
+ gr.top_block.__init__(self)
+ (options, args) = self._process_options()
+ self.tuner_callback = tuner(self)
+ self.synchronizer_callback = synchronizer(self)
+ self.options = options
+ self.args = args
+ self._set_rates()
+ self.source = self._set_source()
+ self.filtr = self._set_filter()
+ self.interpolator = self._set_interpolator()
+ self.receiver = self._set_receiver()
+ self.converter = self._set_converter()
+ self.sink = self._set_sink()
+
+ self.connect(self.source, self.filtr, self.interpolator, self.receiver, self.converter, self.sink)
+
+ def _set_sink(self):
+ nazwa_pliku_wy = self.options.outputfile
+ ujscie = gr.file_sink(gr.sizeof_float, nazwa_pliku_wy)
+ return ujscie
+
+ def _set_source(self):
+ options = self.options
+ self.usrp = usrp2.source_32fc(options.interface, options.mac_addr)
+ self.usrp.set_decim(options.decim)
+
+ # determine the daughterboard subdevice
+ input_rate = self.usrp.adc_rate() / options.decim
+
+ # set initial values
+ if options.gain is None:
+ # if no gain was specified, use the mid-point in dB
+ g = self.usrp.gain_range()
+ options.gain = float(g[0]+g[1])/2
+
+ r = self.usrp.set_center_freq(options.freq)
+ self.usrp.set_gain(options.gain)
+ return self.usrp
+
+ def _set_rates(self):
+ options = self.options
+ clock_rate = 100e6
+ self.clock_rate = clock_rate
+ self.input_rate = clock_rate / options.decim
+ self.gsm_symb_rate = 1625000.0 / 6.0
+ self.sps = self.input_rate / self.gsm_symb_rate / self.options.osr
+
+ def _set_filter(self):
+ filter_cutoff = 145e3
+ filter_t_width = 10e3
+ offset = 0
+# print "input_rate:", self.input_rate, "sample rate:", self.sps, " filter_cutoff:", filter_cutoff, " filter_t_width:", filter_t_width
+ filter_taps = gr.firdes.low_pass(1.0, self.input_rate, filter_cutoff, filter_t_width, gr.firdes.WIN_HAMMING)
+ filtr = gr.freq_xlating_fir_filter_ccf(1, filter_taps, offset, self.input_rate)
+ return filtr
+
+ def _set_converter(self):
+ v2s = gr.vector_to_stream(gr.sizeof_float, 142)
+ return v2s
+
+ def _set_interpolator(self):
+ interpolator = gr.fractional_interpolator_cc(0, self.sps)
+ return interpolator
+
+ def _set_receiver(self):
+ receiver = gsm.receiver_cf(self.tuner_callback, self.synchronizer_callback, self.options.osr, "0000000000000000")
+ return receiver
+
+ def _process_options(self):
+ parser = OptionParser(option_class=eng_option)
+ parser.add_option("-e", "--interface", type="string", default="eth0",
+ help="select Ethernet interface, default is eth0")
+ parser.add_option("-m", "--mac-addr", type="string", default="",
+ help="select USRP by MAC address, default is auto-select")
+ parser.add_option("-d", "--decim", type="int", default=112,
+ help="Set USRP decimation rate to DECIM [default=%default]")
+ parser.add_option("-I", "--inputfile", type="string", default="cfile",
+ help="Input filename")
+ parser.add_option("-O", "--outputfile", type="string", default="cfile2.out",
+ help="Output filename")
+ parser.add_option("-r", "--osr", type="int", default=4,
+ help="Oversampling ratio [default=%default]")
+ parser.add_option("-f", "--freq", type="eng_float", default="950.4M",
+ 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)")
+ (options, args) = parser.parse_args ()
+ return (options, args)
+
+ def set_center_frequency(self, center_freq):
+ self.filtr.set_center_freq(center_freq)
+
+ def set_timing(self, timing_offset):
+ pass
+
+def main():
+ try:
+ gsm_receiver_first_blood().run()
+ except KeyboardInterrupt:
+ pass
+
+if __name__ == '__main__':
+ main()
+
+
personal git repositories of Harald Welte. Your mileage may vary