1 files changed, 86 insertions, 0 deletions

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';
+        }
+}