diff --git a/NXDNGateway/GPSHandler.cpp b/NXDNGateway/GPSHandler.cpp index 696f5ff..650d1f7 100644 --- a/NXDNGateway/GPSHandler.cpp +++ b/NXDNGateway/GPSHandler.cpp @@ -1,5 +1,5 @@ /* -* Copyright (C) 2018 by Jonathan Naylor G4KLX +* Copyright (C) 2018,2020 by Jonathan Naylor G4KLX * * 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 @@ -64,7 +64,9 @@ void CGPSHandler::processData(const unsigned char* data) m_length += NXDN_DATA_LENGTH; if (data[0U] == 0x00U) { - processNMEA(); + bool ret = processIcom(); + if (!ret) + processKenwood(); reset(); } } @@ -81,23 +83,25 @@ void CGPSHandler::reset() m_source.clear(); } -void CGPSHandler::processNMEA() +bool CGPSHandler::processIcom() { if (m_data[0U] != NXDN_DATA_TYPE_GPS) - return; + return false; if (::memcmp(m_data + 1U, "$G", 2U) != 0) - return; + return false; if (::strchr((char*)(m_data + 1U), '*') == NULL) - return; + return false; + + // From here onwards we have something that looks like Icom GPS data if (!checkXOR()) - return; + return true; if (::memcmp(m_data + 4U, "RMC", 3U) != 0) { CUtils::dump("Unhandled NMEA sentence", (unsigned char*)(m_data + 1U), m_length - 1U); - return; + return true; } // Parse the $GxRMC string into tokens @@ -114,11 +118,11 @@ void CGPSHandler::processNMEA() // Is there any position data? if (pRMC[3U] == NULL || pRMC[4U] == NULL || pRMC[5U] == NULL || pRMC[6U] == NULL || ::strlen(pRMC[3U]) == 0U || ::strlen(pRMC[4U]) == 0U || ::strlen(pRMC[5U]) == 0 || ::strlen(pRMC[6U]) == 0) - return; + return true; // Is it a valid GPS fix? if (::strcmp(pRMC[2U], "A") != 0) - return; + return true; double latitude = ::atof(pRMC[3U]); double longitude = ::atof(pRMC[5U]); @@ -142,6 +146,8 @@ void CGPSHandler::processNMEA() } m_writer->write(output); + + return true; } bool CGPSHandler::checkXOR() const @@ -158,3 +164,95 @@ bool CGPSHandler::checkXOR() const return ::memcmp(buffer, p2 + 1U, 2U) == 0; } + +void CGPSHandler::processKenwood() +{ + enum { + GPS_FULL, + GPS_SHORT, + GPS_VERY_SHORT + } type; + + switch (m_data[0U]) { + case 0x00U: + type = GPS_FULL; + break; + case 0x01U: + type = GPS_SHORT; + break; + case 0x02U: + type = GPS_VERY_SHORT; + break; + default: + return; + } + + unsigned char UTCss = m_data[1U] & 0x3FU; + unsigned char UTCmm = ((m_data[1U] & 0xC0U) >> 2) | (m_data[2U] & 0x0FU); + unsigned char UTChh = ((m_data[3U] & 0x01U) << 4) | (m_data[2U] & 0xF0U) >> 4; + + unsigned char UTCday = 0x1FU; + unsigned char UTCmonth = 0x0FU; + unsigned char UTCyear = 0x7FU; + if (type == GPS_FULL) { + UTCday = m_data[15U] & 0x1FU; + UTCmonth = ((m_data[15U] & 0xE0U) >> 3) | (m_data[16] & 0x01U); + UTCyear = (m_data[16U] & 0xFEU) >> 1; + } + + unsigned char north = 'N'; + unsigned int latAfter = 0x7FFFU; + unsigned int latBefore = 0xFFFFU; + unsigned char east = 'E'; + unsigned int longAfter = 0x7FFFU; + unsigned int longBefore = 0xFFFFU; + if (type == GPS_VERY_SHORT) { + north = (m_data[5U] & 0x01U) == 0x00U ? 'N' : 'S'; + latAfter = ((m_data[5U] & 0xFEU) >> 1) | (m_data[6U] << 7); + latBefore = (m_data[8U] << 8) | m_data[7U]; + + east = (m_data[9U] & 0x01U) == 0x00U ? 'E' : 'W'; + longAfter = ((m_data[9U] & 0xFEU) >> 1) | (m_data[10U] << 7); + longBefore = (m_data[12U] << 8) | m_data[11U]; + } else { + north = (m_data[7U] & 0x01U) == 0x00U ? 'N' : 'S'; + latAfter = ((m_data[7U] & 0xFEU) >> 1) | (m_data[8U] << 7); + latBefore = (m_data[10U] << 8) | m_data[9U]; + + east = (m_data[11U] & 0x01U) == 0x00U ? 'E' : 'W'; + longAfter = ((m_data[11U] & 0xFEU) >> 1) | (m_data[12U] << 7); + longBefore = (m_data[14U] << 8) | m_data[13U]; + } + + if (latAfter == 0x7FFFU || latBefore == 0xFFFFU || longAfter == 0x7FFFU || longBefore == 0xFFFFU) + return; + + unsigned int course = 0xFFFFU; + unsigned int speedBefore = 0x3FFU; + unsigned int speedAfter = 0x0FU; + if (type == GPS_FULL) { + course = (m_data[21U] << 4) | (m_data[22U] & 0x0FU); + speedBefore = ((m_data[23U] & 0xF0U) << 2) | (m_data[24U] & 0x3FU); + speedAfter = m_data[23U] & 0x0FU; + } + + std::string source = m_source; + if (!m_suffix.empty()) { + source.append("-"); + source.append(m_suffix.substr(0U, 1U)); + } + + char output[300U]; + if (course != 0xFFFFU && speedBefore != 0x3FFU && speedAfter != 0x0FU) { + ::sprintf(output, "%s>APDPRS,NXDN*,qAR,%s:!%07u.%02lu%c/%08u.%02u%cr%03d/%03d via MMDVM", + source.c_str(), m_callsign.c_str(), latBefore, latAfter, north, longBefore, longAfter, east, course / 10U, speedBefore); + } + else { + ::sprintf(output, "%s>APDPRS,NXDN*,qAR,%s:!%07u.%02u%c/%08u.%02u%cr via MMDVM", + source.c_str(), m_callsign.c_str(), latBefore, latAfter, north, longBefore, longAfter, east); + } + + LogMessage("Kenwood APRS message = %s", output); + + // m_writer->write(output); +} diff --git a/NXDNGateway/GPSHandler.h b/NXDNGateway/GPSHandler.h index 44cdb34..cd46936 100644 --- a/NXDNGateway/GPSHandler.h +++ b/NXDNGateway/GPSHandler.h @@ -1,5 +1,5 @@ /* -* Copyright (C) 2018 by Jonathan Naylor G4KLX +* Copyright (C) 2018,2020 by Jonathan Naylor G4KLX * * 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 @@ -42,7 +42,8 @@ private: std::string m_source; std::string m_suffix; - void processNMEA(); + bool processIcom(); + void processKenwood(); bool checkXOR() const; void reset(); }; diff --git a/NXDNGateway/Version.h b/NXDNGateway/Version.h index 0ebde8d..96e2fee 100644 --- a/NXDNGateway/Version.h +++ b/NXDNGateway/Version.h @@ -19,6 +19,6 @@ #if !defined(VERSION_H) #define VERSION_H -const char* VERSION = "20200409"; +const char* VERSION = "20200429"; #endif