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-rwxr-xr-xsrc/python/gsm_receive.py108
1 files changed, 108 insertions, 0 deletions
diff --git a/src/python/gsm_receive.py b/src/python/gsm_receive.py
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+++ b/src/python/gsm_receive.py
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+#!/usr/bin/env python
+#!/usr/bin/env python
+
+from gnuradio import gr, gru, blks2
+#, gsm
+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']:
+ if extdir not in sys.path:
+ sys.path.append(extdir)
+import gsm
+
+class tune(gr.feval_dd):
+ def __init__(self, top_block):
+ gr.feval_dd.__init__(self)
+ self.top_block = top_block
+ # self.center_freq = 0
+ def eval(self, freq_offet):
+ # self.center_freq = self.center_freq - freq_offet
+ self.top_block.set_frequency(freq_offet)
+ return freq_offet
+
+class gsm_receiver_first_blood(gr.top_block):
+ def __init__(self):
+ gr.top_block.__init__(self)
+ (options, args) = self._przetworz_opcje()
+ self.tune_callback = tune(self)
+ self.options = options
+ self.args = args
+ self._ustaw_taktowanie()
+ self.zrodlo = self._ustaw_zrodlo()
+ self.filtr = self._ustaw_filtr()
+ self.interpolator = self._ustaw_interpolator()
+ self.odbiornik = self._ustaw_odbiornik()
+ self.konwerter = self._ustaw_konwerter()
+ self.ujscie = self._ustaw_ujscie()
+
+ self.connect(self.zrodlo, self.filtr, self.interpolator, self.odbiornik, self.konwerter, self.ujscie)
+# self.connect(self.zrodlo, self.ujscie)
+
+ def _ustaw_ujscie(self):
+ nazwa_pliku_wy = self.options.outputfile
+ ujscie = gr.file_sink(gr.sizeof_float, nazwa_pliku_wy)
+ return ujscie
+
+ def _ustaw_zrodlo(self):
+ nazwa_pliku = self.options.inputfile
+ zrodlo = gr.file_source(gr.sizeof_gr_complex, nazwa_pliku, False)
+ return zrodlo
+
+ def _ustaw_taktowanie(self):
+ options = self.options
+ clock_rate = 64e6
+ 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 _ustaw_filtr(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 _ustaw_konwerter(self):
+ v2s = gr.vector_to_stream(gr.sizeof_float, 142)
+ return v2s
+
+ def _ustaw_interpolator(self):
+ interpolator = gr.fractional_interpolator_cc(0, self.sps)
+# interpolator = blks2.rational_resampler_ccf(13, 6)
+ return interpolator
+
+ def _ustaw_odbiornik(self):
+ odbiornik = gsm.receiver_cf(self.tune_callback, self.options.osr)
+ return odbiornik
+
+ def _przetworz_opcje(self):
+ parser = OptionParser(option_class=eng_option)
+ parser.add_option("-d", "--decim", type="int", default=128,
+ help="Set USRP decimation rate to DECIM [default=%default]")
+ parser.add_option("-r", "--osr", type="int", default=4,
+ help="Oversampling ratio [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")
+ (options, args) = parser.parse_args ()
+ return (options, args)
+
+ def set_frequency(self, center_freq):
+ self.filtr.set_center_freq(center_freq)
+
+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