[examples] Add Raspberry Pi GPIO example

examples/rpi/blinky/main.cpp

@@ -0,0 +1,28 @@
+/*
+ * Copyright (c) 2020, Erik Henriksson
+ *
+ * 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/debug/logger.hpp>
+#include <modm/board.hpp>
+
+using namespace Board;
+
+int main()
+{
+	Board::initialize();
+	GpioPin<0>::setOutput();
+	MODM_LOG_INFO << "Blink blink...";
+
+	for (int i = 0; i < 10; ++i)
+	{
+		GpioPin<0>::toggle();
+		modm::delay(500ms);
+	}
+	return 0;
+}

examples/rpi/blinky/project.xml

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+<library>
+  <extends>modm:raspberrypi</extends>
+  <options>
+    <option name="modm:build:build.path">../../../build/rpi/blinky</option>
+  </options>
+  <modules>
+    <module>modm:build:scons</module>
+  </modules>
+</library>