mirror of https://github.com/ShaYmez/MMDVM_CM.git
292 lines
7.5 KiB
C++
292 lines
7.5 KiB
C++
/*
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* Copyright (C) 2016,2017 by Jonathan Naylor G4KLX
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*
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* This program 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 2 of the License, or
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* (at your option) any later version.
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*
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* This program 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 this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include "GPS.h"
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#include "YSFPayload.h"
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#include "YSFDefines.h"
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#include "Utils.h"
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#include "CRC.h"
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#include "Log.h"
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#include <cstdio>
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#include <cassert>
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#include <cstring>
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const unsigned char NULL_GPS[] = {0x47U, 0x63U};
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const unsigned char SHRT_GPS[] = {0x22U, 0x62U};
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const unsigned char LONG_GPS[] = {0x47U, 0x64U};
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CGPS::CGPS(const std::string& callsign, const std::string& suffix, const std::string& password, const std::string& address, unsigned int port) :
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m_writer(callsign, suffix, password, address, port),
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m_buffer(NULL),
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m_sent(false)
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{
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assert(!callsign.empty());
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assert(!password.empty());
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assert(!address.empty());
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assert(port > 0U);
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m_buffer = new unsigned char[300U];
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}
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CGPS::~CGPS()
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{
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delete[] m_buffer;
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}
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void CGPS::setInfo(unsigned int txFrequency, unsigned int rxFrequency, float latitude, float longitude, int height, const std::string& desc)
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{
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m_writer.setInfo(txFrequency, rxFrequency, latitude, longitude, height, desc);
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}
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bool CGPS::open()
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{
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return m_writer.open();
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}
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void CGPS::data(const unsigned char* source, const unsigned char* data, unsigned char fi, unsigned char dt, unsigned char fn, unsigned char ft)
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{
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if (m_sent)
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return;
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if (fi != YSF_FI_COMMUNICATIONS)
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return;
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CYSFPayload payload;
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if (dt == YSF_DT_VD_MODE1) {
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if (fn == 0U || fn == 1U || fn == 2U)
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return;
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bool valid = payload.readVDMode1Data(data, m_buffer + (fn - 3U) * 20U);
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if (!valid)
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return;
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if (fn == ft) {
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bool valid = false;
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// Find the end marker
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for (unsigned int i = (fn - 2U) * 20U; i > 0U; i--) {
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if (m_buffer[i] == 0x03U) {
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unsigned char crc = CCRC::addCRC(m_buffer, i + 1U);
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if (crc == m_buffer[i + 1U])
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valid = true;
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break;
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}
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}
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if (valid) {
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if (::memcmp(m_buffer + 1U, SHRT_GPS, 2U) == 0) {
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CUtils::dump("Short GPS data received", m_buffer, (fn - 2U) * 20U);
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transmitGPS(source);
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}
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if (::memcmp(m_buffer + 1U, LONG_GPS, 2U) == 0) {
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CUtils::dump("Long GPS data received", m_buffer, (fn - 2U) * 20U);
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transmitGPS(source);
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}
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m_sent = true;
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}
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}
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} else if (dt == YSF_DT_VD_MODE2) {
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if (fn != 6U && fn != 7U)
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return;
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bool valid = payload.readVDMode2Data(data, m_buffer + (fn - 6U) * 10U);
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if (!valid)
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return;
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// if end of frames
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if (fn == ft) {
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bool valid = false;
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// Find the end marker
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for (unsigned int i = (fn - 5U) * 10U; i > 0U; i--) {
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if (m_buffer[i] == 0x03U) {
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unsigned char crc = CCRC::addCRC(m_buffer, i + 1U);
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if (crc == m_buffer[i + 1U])
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valid = true;
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break;
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}
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}
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if (valid) {
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if (::memcmp(m_buffer + 1U, SHRT_GPS, 2U) == 0) {
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CUtils::dump("Short GPS data received", m_buffer, (fn - 5U) * 10U);
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transmitGPS(source);
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}
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if (::memcmp(m_buffer + 1U, LONG_GPS, 2U) == 0) {
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CUtils::dump("Long GPS data received", m_buffer, (fn - 5U) * 10U);
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transmitGPS(source);
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}
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m_sent = true;
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}
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}
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}
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}
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void CGPS::reset()
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{
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m_sent = false;
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}
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void CGPS::transmitGPS(const unsigned char* source)
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{
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// We don't know who its from!
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if (::memcmp(source, " ", YSF_CALLSIGN_LENGTH) == 0)
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return;
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for (unsigned int i = 5U; i < 11U; i++) {
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unsigned char b = m_buffer[i] & 0xF0U;
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if (b != 0x50U && b != 0x30U)
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return; // error/unknown
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}
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unsigned int tens = m_buffer[5U] & 0x0FU;
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unsigned int units = m_buffer[6U] & 0x0FU;
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unsigned int lat_deg = (tens * 10U) + units;
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if (tens > 9U || units > 9U || lat_deg > 89U)
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return; // error/unknown
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tens = m_buffer[7U] & 0x0FU;
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units = m_buffer[8U] & 0x0FU;
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unsigned int lat_min = (tens * 10U) + units;
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if (tens > 9U || units > 9U || lat_min > 59U)
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return; // error/unknown
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tens = m_buffer[9U] & 0x0FU;
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units = m_buffer[10U] & 0x0FU;
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unsigned int lat_min_frac = (tens * 10U) + units;
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if (tens > 9U || units > 10U || lat_min_frac > 99U) // units > 10 ??? .. more buggy Yaesu firmware ?
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return; // error/unknown
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int lat_dir;
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unsigned char b = m_buffer[8U] & 0xF0U; // currently a guess
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if (b == 0x50U)
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lat_dir = 1; // N
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else if (b == 0x30U)
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lat_dir = -1; // S
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else
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return; // error/unknown
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unsigned int lon_deg;
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b = m_buffer[9U] & 0xF0U;
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if (b == 0x50U) {
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// lon deg 0 to 9, and 100 to 179
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b = m_buffer[11U];
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if (b >= 0x76U && b <= 0x7FU)
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lon_deg = b - 0x76U; // 0 to 9
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else if (b >= 0x6CU && b <= 0x75U)
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lon_deg = 100U + (b - 0x6CU); // 100 to 109
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else if (b >= 0x26U && b <= 0x6BU)
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lon_deg = 110U + (b - 0x26U); // 110 to 179
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else
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return; // error/unknown
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} else if (b == 0x30U) {
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// lon deg 10 to 99
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b = m_buffer[11U];
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if (b >= 0x26U && b <= 0x7FU)
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lon_deg = 10U + (b - 0x26U); // 10 to 99
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else
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return; // error/unknown
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} else {
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return; // error/unknown
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}
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unsigned int lon_min;
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b = m_buffer[12U];
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if (b >= 0x58U && b <= 0x61U)
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lon_min = b - 0x58U; // 0 to 9
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else if (b >= 0x26U && b <= 0x57U)
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lon_min = 10U + (b - 0x26U); // 10 to 59
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else
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return; // error/unknown
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unsigned int lon_min_frac;
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b = m_buffer[13U];
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if (b >= 0x1CU && b <= 0x7FU)
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lon_min_frac = b - 0x1CU;
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else
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return; // error/unknown
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int lon_dir;
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b = m_buffer[10U] & 0xF0U;
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if (b == 0x30U)
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lon_dir = 1; // E
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else if (b == 0x50U)
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lon_dir = -1; // W
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else
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return; // error/unknown
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unsigned int lat_sec = lat_min_frac * 60U;
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lat_sec = (lat_sec + (lat_sec % 100U)) / 100U; // with rounding
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unsigned int lon_sec = lon_min_frac * 60U;
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lon_sec = (lon_sec + (lon_sec % 100U)) / 100U; // with rounding
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// >= 0 is north, < 0 is south
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float latitude = lat_deg + ((lat_min + ((float)lat_min_frac * 0.01F)) * (1.0F / 60.0F));
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latitude *= lat_dir;
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// >= 0 is east, < 0 is west
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float longitude = lon_deg + ((lon_min + ((float)lon_min_frac * 0.01F)) * (1.0F / 60.0F));
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longitude *= lon_dir;
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char radio[10U];
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switch (m_buffer[4U]) {
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case 0x24U:
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::strcpy(radio, "FT-1D");
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break;
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case 0x25U:
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::strcpy(radio, "FTM-400D");
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break;
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case 0x26U:
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::strcpy(radio, "DR-1X");
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break;
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case 0x28U:
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::strcpy(radio, "FT-2D");
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break;
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case 0x29U:
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::strcpy(radio, "FTM-100D");
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break;
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default:
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::sprintf(radio, "0x%02X", m_buffer[4U]);
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break;
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}
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LogMessage("GPS Position from %10.10s of radio=%s lat=%f long=%f", source, radio, latitude, longitude);
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m_writer.write(source, radio, m_buffer[4U], latitude, longitude);
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m_sent = true;
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}
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void CGPS::clock(unsigned int ms)
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{
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m_writer.clock(ms);
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}
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void CGPS::close()
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{
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m_writer.close();
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}
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