| #!/usr/bin/env python2 |
| # -*- coding: utf-8 -*- |
| |
| # GR-GSM based transceiver |
| # Follow graph implementation |
| # |
| # (C) 2016-2017 by Vadim Yanitskiy <axilirator@gmail.com> |
| # |
| # All Rights Reserved |
| # |
| # This program 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 2 of the License, or |
| # (at your option) any later version. |
| # |
| # This program 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 this program; if not, write to the Free Software Foundation, Inc., |
| # 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
| |
| import pmt |
| import time |
| import grgsm |
| import osmosdr |
| |
| from math import pi |
| |
| from gnuradio import blocks |
| from gnuradio import gr |
| |
| class radio_if(gr.top_block): |
| # PHY specific variables |
| shiftoff = 400e3 |
| fc = 941.6e6 # TODO: set ARFCN to 0? |
| |
| # Application state flags |
| trx_started = False |
| fc_set = False |
| |
| def __init__(self, phy_args, phy_sample_rate, |
| phy_rx_gain, phy_tx_gain, phy_ppm, |
| phy_rx_antenna, phy_tx_antenna, |
| trx_remote_addr, trx_base_port): |
| |
| print("[i] Init Radio interface") |
| |
| # PHY specific variables |
| self.rx_gain = phy_rx_gain |
| self.tx_gain = phy_tx_gain |
| |
| gr.top_block.__init__(self, "GR-GSM TRX") |
| shift_fc = self.fc - self.shiftoff |
| |
| ################################################## |
| # PHY Definition |
| ################################################## |
| self.phy = osmosdr.source(args = "numchan=%d %s" % (1, phy_args)) |
| |
| self.phy.set_bandwidth(250e3 + abs(self.shiftoff), 0) |
| self.phy.set_center_freq(shift_fc, 0) |
| self.phy.set_sample_rate(phy_sample_rate) |
| self.phy.set_freq_corr(phy_ppm, 0) |
| self.phy.set_iq_balance_mode(2, 0) |
| self.phy.set_dc_offset_mode(2, 0) |
| self.phy.set_gain_mode(False, 0) |
| self.phy.set_gain(self.rx_gain, 0) |
| self.phy.set_if_gain(20, 0) |
| self.phy.set_bb_gain(20, 0) |
| self.phy.set_antenna(phy_rx_antenna, 0) |
| |
| ################################################## |
| # GR-GSM Magic |
| ################################################## |
| self.blocks_rotator = blocks.rotator_cc( |
| -2 * pi * self.shiftoff / phy_sample_rate) |
| |
| self.gsm_input = grgsm.gsm_input( |
| ppm = phy_ppm, osr = 4, fc = self.fc, |
| samp_rate_in = phy_sample_rate) |
| |
| self.gsm_receiver = grgsm.receiver(4, ([0]), ([])) |
| |
| self.gsm_clck_ctrl = grgsm.clock_offset_control( |
| shift_fc, phy_sample_rate, osr = 4) |
| |
| self.gsm_ts_filter = grgsm.burst_timeslot_filter(0) |
| self.gsm_ts_filter.set_policy(grgsm.FILTER_POLICY_DROP_ALL) |
| |
| self.gsm_trx_burst_if = grgsm.trx_burst_if( |
| trx_remote_addr, str(trx_base_port)) |
| |
| ################################################## |
| # Connections |
| ################################################## |
| self.connect((self.phy, 0), (self.blocks_rotator, 0)) |
| self.connect((self.blocks_rotator, 0), (self.gsm_input, 0)) |
| self.connect((self.gsm_input, 0), (self.gsm_receiver, 0)) |
| |
| self.msg_connect((self.gsm_receiver, 'measurements'), |
| (self.gsm_clck_ctrl, 'measurements')) |
| |
| self.msg_connect((self.gsm_clck_ctrl, 'ctrl'), |
| (self.gsm_input, 'ctrl_in')) |
| |
| self.msg_connect((self.gsm_receiver, 'C0'), |
| (self.gsm_ts_filter, 'in')) |
| |
| self.msg_connect((self.gsm_ts_filter, 'out'), |
| (self.gsm_trx_burst_if, 'bursts')) |
| |
| def check_available(self): |
| return self.fc_set |
| |
| def shutdown(self): |
| print("[i] Shutdown Radio interface") |
| self.stop() |
| self.wait() |
| |
| def set_fc(self, fc): |
| self.phy.set_center_freq(fc - self.shiftoff, 0) |
| self.gsm_input.set_fc(fc) |
| self.fc_set = True |
| self.fc = fc |
| |
| def set_rx_gain(self, gain): |
| self.phy.set_gain(gain, 0) |
| self.rx_gain = gain |
| |
| def set_tx_gain(self, gain): |
| # TODO: TX chain not implemented yet |
| self.tx_gain = gain |