[examples] Add STM32F4 disco board example with encoder output

examples/stm32f4_discovery/encoder_output/main.cpp

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+/*
+ * Copyright (c) 2011, Georgi Grinshpun
+ * Copyright (c) 2011-2012, Fabian Greif
+ * Copyright (c) 2012, 2014, Sascha Schade
+ * Copyright (c) 2013, Kevin Läufer
+ * Copyright (c) 2013, 2015-2017, Niklas Hauser
+ *
+ * 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>
+#include <modm/driver/encoder/encoder_output.hpp>
+
+using namespace Board;
+
+// ----------------------------------------------------------------------------
+int
+main()
+{
+
+	initialize();
+
+	LedBlue::set();
+	LedGreen::set();
+
+	using TestEncoder = modm::EncoderOutput<LedBlue, LedGreen, int32_t, modm::LongPrecisionPeriodicTimer, 500'000>;
+	TestEncoder testEncoder{0};
+
+	testEncoder.setPosition(1 << 31);
+	while (1)
+	{
+		testEncoder.update();
+		LedRed::toggle();
+	}
+
+	return 0;
+}

examples/stm32f4_discovery/encoder_output/project.xml

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+<library>
+  <extends>modm:board:disco-f407vg</extends>
+  <options>
+    <option name="modm:build:build.path">../../../build/stm32f4_discovery/encoder_output</option>
+  </options>
+  <modules>
+    <module>modm:driver:encoder.output</module>
+    <module>modm:build:scons</module>
+  </modules>
+</library>