mirror of https://github.com/gnss-sdr/gnss-sdr
154 lines
4.3 KiB
C++
154 lines
4.3 KiB
C++
/*!
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* \file rtl_tcp_dongle_info.cc
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* \brief Defines methods for retrieving and validating rtl_tcp donle
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* info.
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* \author Anthony Arnold, 2015. anthony.arnold(at)uqconnect.edu.au
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*
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* This file contains information taken from librtlsdr:
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* https://git.osmocom.org/rtl-sdr
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* -------------------------------------------------------------------------
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*
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* Copyright (C) 2010-2019 (see AUTHORS file for a list of contributors)
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*
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* GNSS-SDR is a software defined Global Navigation
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* Satellite Systems receiver
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*
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* This file is part of GNSS-SDR.
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*
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* GNSS-SDR is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* GNSS-SDR is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GNSS-SDR. If not, see <https://www.gnu.org/licenses/>.
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*
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* -------------------------------------------------------------------------
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*/
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#include "rtl_tcp_dongle_info.h"
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#include <boost/foreach.hpp>
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#include <string>
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#include <vector>
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using boost::asio::ip::tcp;
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Rtl_Tcp_Dongle_Info::Rtl_Tcp_Dongle_Info() : tuner_type_(0), tuner_gain_count_(0)
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{
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std::memset(magic_, 0, sizeof(magic_));
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}
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boost::system::error_code Rtl_Tcp_Dongle_Info::read(boost::asio::ip::tcp::socket &socket)
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{
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boost::system::error_code ec;
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unsigned char data[sizeof(char) * 4 + sizeof(uint32_t) * 2];
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socket.receive(boost::asio::buffer(data), 0, ec);
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if (!ec)
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{
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std::memcpy(magic_, data, 4);
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uint32_t type;
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std::memcpy(&type, &data[4], 4);
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tuner_type_ = boost::asio::detail::socket_ops::network_to_host_long(type);
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uint32_t count;
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std ::memcpy(&count, &data[8], 4);
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tuner_gain_count_ = boost::asio::detail::socket_ops::network_to_host_long(count);
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}
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return ec;
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}
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const char *Rtl_Tcp_Dongle_Info::get_type_name() const
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{
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switch (get_tuner_type())
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{
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default:
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return "UNKNOWN";
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case TUNER_E4000:
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return "E4000";
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case TUNER_FC0012:
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return "FC0012";
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case TUNER_FC0013:
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return "FC0013";
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case TUNER_FC2580:
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return "FC2580";
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case TUNER_R820T:
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return "R820T";
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case TUNER_R828D:
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return "R828D";
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}
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}
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double Rtl_Tcp_Dongle_Info::clip_gain(int gain) const
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{
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// the following gain values have been copied from librtlsdr
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// all gain values are expressed in tenths of a dB
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std::vector<double> gains;
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switch (get_tuner_type())
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{
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case TUNER_E4000:
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gains = {-10, 15, 40, 65, 90, 115, 140, 165, 190, 215,
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240, 290, 340, 420};
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break;
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case TUNER_FC0012:
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gains = {-99, -40, 71, 179, 192};
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break;
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case TUNER_FC0013:
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gains = {-99, -73, -65, -63, -60, -58, -54, 58, 61,
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63, 65, 67, 68, 70, 71, 179, 181, 182,
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184, 186, 188, 191, 197};
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break;
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case TUNER_R820T:
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gains = {0, 9, 14, 27, 37, 77, 87, 125, 144, 157,
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166, 197, 207, 229, 254, 280, 297, 328,
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338, 364, 372, 386, 402, 421, 434, 439,
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445, 480, 496};
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break;
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default:
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// no gains
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break;
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}
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// clip
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if (gains.empty())
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{
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// no defined gains to clip to
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return gain;
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}
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double last_stop = gains.front();
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BOOST_FOREACH (double g, gains)
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{
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g /= 10.0;
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if (gain < g)
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{
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if (std::abs(gain - g) < std::abs(gain - last_stop))
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{
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return g;
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}
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return last_stop;
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}
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last_stop = g;
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}
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return last_stop;
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}
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bool Rtl_Tcp_Dongle_Info::is_valid() const
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{
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return std::memcmp(magic_, "RTL0", 4) == 0;
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}
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