From 4f78ef5b3ab7d4ff864b7ad6d31e0184d1aa0872 Mon Sep 17 00:00:00 2001
From: Thomas Schmucker <ts@its1.de>
Date: Fri, 14 Aug 2026 14:05:35 +0200
Subject: automatischer Download von minmea

---
 .gitignore        |  5 +++++
 compile_flags.txt |  5 +----
 config.mk         |  5 +++--
 makefile          | 20 ++++++++++++++++----
 src/main.cpp      | 27 ++++++++++++++++++---------
 5 files changed, 43 insertions(+), 19 deletions(-)

diff --git a/.gitignore b/.gitignore
index cd42ee3..ca1f238 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,7 @@
+minmea.tgz
+src/minmea.c
+src/minmea.h
+src/.minmea.stamp
 bin/
 obj/
+
diff --git a/compile_flags.txt b/compile_flags.txt
index 3ea2c1a..cccab63 100644
--- a/compile_flags.txt
+++ b/compile_flags.txt
@@ -4,7 +4,4 @@
 -Wconversion
 -Wdouble-promotion
 -pedantic
--std=c++17
--Iinclude
--I../minmea/include
--I/usr/local/include
+-std=c++23
diff --git a/config.mk b/config.mk
index 29f8ca1..aa17664 100644
--- a/config.mk
+++ b/config.mk
@@ -1,2 +1,3 @@
-CPPFLAGS=-Wall -Werror -pedantic -std=c++17 -O2 -Iinclude -I../minmea/include -I/usr/local/include -DNDEBUG
-LDFLAGS=-L../minmea/lib -lminmea -L/usr/local/lib -lpthread
+CPPFLAGS=-Wall -Wno-gnu-anonymous-struct -pedantic -std=c++23 -O2 -DNDEBUG
+CFLAGS=-Wall -pedantic -std=c11 -O2 -DNDEBUG
+LDFLAGS=-lpthread
diff --git a/makefile b/makefile
index 3f481bc..a8742bf 100644
--- a/makefile
+++ b/makefile
@@ -1,15 +1,27 @@
 include config.mk
 
-bin/app: obj/main.o | bin
+bin/app: obj/main.o obj/minmea.o | bin
 	c++ $(LDFLAGS) $^ -o $@
 
-obj/%.o: src/%.cpp | obj
+obj/%.o: src/%.cpp src/minmea.h | obj
 	c++ $(CPPFLAGS) -c $< -o $@
 
+obj/%.o: src/%.c src/minmea.h | obj
+	cc $(CFLAGS) -c $< -o $@
+
+minmea.tgz:
+	curl -s -o $@ https://codeload.github.com/kosma/minmea/tar.gz/refs/tags/v1.0.0
+
+src/.minmea.stamp: minmea.tgz | src
+	tar -xzvf $< --strip-components=1 -C src/ minmea-1.0.0/minmea.h minmea-1.0.0/minmea.c
+	touch $@
+
+src/minmea.h src/minmea.c: src/.minmea.stamp
+
 clean:
-	rm -rf bin obj
+	rm -rf bin obj minmea.tgz
 
 bin obj:
-	mkdir $@
+	mkdir -p $@
 
 .PHONY: all clean
diff --git a/src/main.cpp b/src/main.cpp
index e699c6a..ed98cb4 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -1,15 +1,22 @@
-#include <asio.hpp>
+// Standard C++
+#include <array>
 #include <ctime>
+#include <exception>
+#include <format>
 #include <iostream>
 #include <string>
 
+// Asio
+#include <asio.hpp>
+
+// minmea
 #include "minmea.h"
 
 using namespace std;
 
-// constexpr auto PORT     = "/dev/cuaU0";
-constexpr auto PORT     = "/dev/ugen0.14";
-constexpr auto BAUDRATE = 9600;
+constexpr auto PORT         = "/dev/cuaU0";
+constexpr auto BAUDRATE     = 9600;
+constexpr auto KNOTS_TO_KMH = 1.852F;
 
 namespace {
 
@@ -32,7 +39,7 @@ read_line(asio::serial_port& com)
 }
 
 string
-get_gps_timestamp(const minmea_time& time, const minmea_date& date)
+get_gps_datetime(const minmea_time& time, const minmea_date& date)
 {
 	tm tm_utc{};
 	::minmea_getdatetime(&tm_utc, &date, &time);
@@ -73,11 +80,13 @@ main()
 				continue;
 			}
 
-			auto timestamp = get_gps_timestamp(frame.time, frame.date);
+			auto timestamp = get_gps_datetime(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';
+			cout << format("{}: $RMC floating point degree coordinates and speed: ({},{}) {} km/h\n",
+			               timestamp,
+			               ::minmea_tocoord(&frame.latitude),
+			               ::minmea_tocoord(&frame.longitude),
+			               ::minmea_tofloat(&frame.speed) * KNOTS_TO_KMH);
 		}
 	}
 	catch ( exception& e ) {
-- 
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