[examples] Add Nucleo-G431RB blink example

examples/nucleo_g431rb/blink/main.cpp

@@ -0,0 +1,39 @@
+/*
+ * Copyright (c) 2020, Raphael Lehmann
+ *
+ * This file is part of the modm project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+#include <modm/board.hpp>
+
+using namespace Board;
+
+int
+main()
+{
+	Board::initialize();
+	LedD13::setOutput();
+
+	// Use the logging streams to print some messages.
+	// Change MODM_LOG_LEVEL above to enable or disable these messages
+	MODM_LOG_DEBUG   << "debug"   << modm::endl;
+	MODM_LOG_INFO    << "info"    << modm::endl;
+	MODM_LOG_WARNING << "warning" << modm::endl;
+	MODM_LOG_ERROR   << "error"   << modm::endl;
+
+	uint32_t counter(0);
+
+	while (true)
+	{
+		LedD13::toggle();
+		modm::delay(Button::read() ? 100ms : 500ms);
+
+		MODM_LOG_INFO << "loop: " << counter++ << modm::endl;
+	}
+
+	return 0;
+}

examples/nucleo_g431rb/blink/project.xml

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+<library>
+  <extends>modm:nucleo-g431rb</extends>
+  <options>
+    <option name="modm:build:build.path">../../../build/nucleo_g431rb/blink</option>
+  </options>
+  <modules>
+    <module>modm:build:scons</module>
+  </modules>
+</library>