From 46c9893607ecd32f8d9e2e6b7c3afa38bfc7e324 Mon Sep 17 00:00:00 2001
From: Thomas Schmucker <ts@its1.de>
Date: Thu, 13 Aug 2026 22:16:05 +0200
Subject: erster import

---
 src/main.cpp | 86 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 86 insertions(+)
 create mode 100644 src/main.cpp

(limited to 'src')

diff --git a/src/main.cpp b/src/main.cpp
new file mode 100644
index 0000000..e699c6a
--- /dev/null
+++ b/src/main.cpp
@@ -0,0 +1,86 @@
+#include <asio.hpp>
+#include <ctime>
+#include <iostream>
+#include <string>
+
+#include "minmea.h"
+
+using namespace std;
+
+// constexpr auto PORT     = "/dev/cuaU0";
+constexpr auto PORT     = "/dev/ugen0.14";
+constexpr auto BAUDRATE = 9600;
+
+namespace {
+
+auto
+read_line(asio::serial_port& com)
+{
+	for ( string result;; ) {
+		char chr = 0;
+
+		asio::read(com, asio::buffer(&chr, 1));
+		switch ( chr ) {
+		case '\r':
+			break;
+		case '\n':
+			return result;
+		default:
+			result += chr;
+		}
+	}
+}
+
+string
+get_gps_timestamp(const minmea_time& time, const minmea_date& date)
+{
+	tm tm_utc{};
+	::minmea_getdatetime(&tm_utc, &date, &time);
+
+	auto timestamp = ::timegm(&tm_utc);
+
+	tm tm_local{};
+	(void) ::localtime_r(&timestamp, &tm_local);
+
+	static const auto        buffer_size = 100;
+	array<char, buffer_size> buffer{};
+
+	(void) ::strftime(buffer.data(), buffer.size(), "%Y-%m-%d %H:%M:%S", &tm_local);
+
+	return buffer.data();
+}
+
+} // namespace
+
+int
+main()
+{
+	try {
+		asio::io_context  io_context{};
+		asio::serial_port com(io_context, PORT);
+		com.set_option(asio::serial_port::baud_rate(BAUDRATE));
+
+		for ( ;; ) {
+			const auto line    = read_line(com);
+			const auto nmea_id = ::minmea_sentence_id(line.c_str(), true);
+
+			if ( nmea_id != MINMEA_SENTENCE_RMC ) {
+				continue;
+			}
+
+			minmea_sentence_rmc frame{};
+			if ( !::minmea_parse_rmc(&frame, line.c_str()) || !frame.valid ) {
+				continue;
+			}
+
+			auto timestamp = get_gps_timestamp(frame.time, frame.date);
+
+			cout << timestamp << ": $RMC floating point degree coordinates and speed: ("
+			     << ::minmea_tocoord(&frame.latitude) << "," << ::minmea_tocoord(&frame.longitude) << ") "
+			     << ::minmea_tofloat(&frame.speed) << '\n';
+		}
+	}
+	catch ( exception& e ) {
+		cerr << "io-error: " << e.what() << '\n';
+	}
+}
-- 
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