| #!/usr/bin/env python |
| # -*- coding: utf-8 -*- |
| # @file |
| # @author Piotr Krysik <ptrkrysik@gmail.com> |
| # @section LICENSE |
| # |
| # Gr-gsm is free software; you can redistribute it and/or modify |
| # it under the terms of the GNU General Public License as published by |
| # the Free Software Foundation; either version 3, or (at your option) |
| # any later version. |
| # |
| # Gr-gsm is distributed in the hope that it will be useful, |
| # but WITHOUT ANY WARRANTY; without even the implied warranty of |
| # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| # GNU General Public License for more details. |
| # |
| # You should have received a copy of the GNU General Public License |
| # along with gr-gsm; see the file COPYING. If not, write to |
| # the Free Software Foundation, Inc., 51 Franklin Street, |
| # Boston, MA 02110-1301, USA. |
| # |
| # |
| |
| from gnuradio import gr |
| from fn_time import fn_time_delta |
| import pmt |
| import numpy |
| |
| class txtime_bursts_tagger(gr.basic_block): |
| """ |
| A block that adds txtime metadata to a burst |
| """ |
| def __init__(self, init_fn=0, init_time=0, time_hint=None, timing_advance=0, delay_correction=0): |
| gr.basic_block.__init__(self, |
| name="txtime_bursts_tagger", |
| in_sig=[], |
| out_sig=[]) |
| self.set_fn_time_reference(init_fn, init_time) |
| if time_hint is not None: |
| self.set_time_hint(time_hint) |
| |
| self.timing_advance = timing_advance |
| self.delay_correction = delay_correction |
| |
| self.message_port_register_in(pmt.intern("fn_time")) |
| self.message_port_register_in(pmt.intern("bursts")) |
| self.message_port_register_out(pmt.intern("bursts")) |
| |
| self.set_msg_handler(pmt.intern("fn_time"), self.process_fn_time_reference) |
| self.set_msg_handler(pmt.intern("bursts"), self.process_txtime_of_burst) |
| |
| def process_fn_time_reference(self, msg): |
| time_hint = pmt.to_python(pmt.dict_ref(msg, pmt.intern("time_hint"), pmt.PMT_NIL)) |
| fn_time = pmt.to_python(pmt.dict_ref(msg, pmt.intern("fn_time"), pmt.PMT_NIL)) |
| |
| if time_hint is not None: |
| self.time_hint = time_hint |
| elif fn_time is not None: |
| self.fn_ref = fn_time[0][0] |
| self.ts = fn_time[0][1] |
| full = fn_time[1][0] |
| frac = fn_time[1][1] |
| |
| self.time_ref = full+frac |
| self.time_hint = self.time_ref |
| |
| def process_txtime_of_burst(self, msg): |
| burst_with_header = pmt.to_python(pmt.cdr(msg)) |
| fn = burst_with_header[11]+burst_with_header[10]*2**8+burst_with_header[9]*2**16+burst_with_header[8]*2**24 |
| ts_num = burst_with_header[3] |
| if self.fn_ref is not None: |
| fn_delta, txtime = fn_time_delta(self.fn_ref, self.time_ref, fn, self.time_hint, ts_num) |
| txtime_corrected = txtime - self.delay_correction |
| txtime_final = txtime_corrected - self.timing_advance |
| |
| txtime_secs = int(txtime_final) |
| txtime_fracs = txtime_final-int(txtime_final) |
| #print "txtime_secs",txtime_secs,"txtime_fracs",txtime_fracs |
| tags_dict = pmt.dict_add(pmt.make_dict(), pmt.intern("tx_time"), pmt.make_tuple(pmt.from_uint64(txtime_secs),pmt.from_double(txtime_fracs))) |
| tags_dict = pmt.dict_add(tags_dict, pmt.intern("fn"), pmt.from_uint64(fn)) |
| new_msg = pmt.cons(tags_dict, pmt.cdr(msg)) |
| self.message_port_pub(pmt.intern("bursts"), new_msg) |
| |
| def set_fn_time_reference(self, init_fn, init_time): |
| self.fn_ref = init_fn |
| self.time_ref = init_time |
| self.set_time_hint(init_time) |
| |
| def set_time_hint(self, time_hint): |
| self.time_hint = time_hint |
| |
| def set_delay_correction(delay_correction): |
| self.delay_correction = delay_correction |
| |
| def set_timing_advance(timing_advance): |
| self.timing_advance = timing_advance |
| |