[examples] Add RTT with OpenOCD example

examples/stm32f469_discovery/rtt/main.cpp

@@ -0,0 +1,49 @@
+/*
+ * Copyright (c) 2021, 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/processing.hpp>
+
+using namespace Board;
+
+Rtt rtt(1);
+modm::IODeviceObjectWrapper< Rtt, modm::IOBuffer::DiscardIfFull > device(rtt);
+modm::IOStream stream(device);
+
+// ----------------------------------------------------------------------------
+int
+main()
+{
+	Board::initialize();
+
+	uint32_t counter(0);
+	modm::PeriodicTimer tmr(100ms);
+
+	char data;
+	while (true)
+	{
+		stream.get(data);
+		switch(data)
+		{
+			case '1'...'9':
+				tmr.restart(std::chrono::milliseconds((data - '0') * 100));
+				break;
+		}
+		if (tmr.execute())
+		{
+			LedBlue::toggle();
+
+			stream << "loop: " << counter++ << modm::endl;
+		}
+	}
+
+	return 0;
+}

examples/stm32f469_discovery/rtt/project.xml

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+<library>
+  <extends>modm:disco-f469ni</extends>
+  <options>
+    <option name="modm:build:build.path">../../../build/stm32f469_discovery/rtt</option>
+    <option name="modm:platform:rtt:buffer.rx">16</option>
+  </options>
+  <modules>
+    <module>modm:platform:rtt</module>
+    <module>modm:processing:timer</module>
+    <module>modm:build:scons</module>
+  </modules>
+</library>