[example] Added watchdog example for Nucleo-F072RB

Co-authored-by: Victor Costa <victor.houriecosta@zuehlke.com>

examples/nucleo_f072rb/independend_watchdog/main.cpp

@@ -0,0 +1,57 @@
+/*
+ * Copyright (c) 2023, Zühlke Engineering (Austria) GmbH
+ *
+ * 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/platform.hpp>
+
+using namespace Board;
+
+/**
+ * If the button is pressed for more than 4 seconds, the MCU will be reset by the Watchdog.
+ * This can be observed by the faster blinking LED after startup.
+ */
+
+int
+main()
+{
+	Board::initialize();
+	LedD13::setOutput();
+	// set the watchdog timeout to 4 seconds
+	Iwdg::initialize(Iwdg::Prescaler::Div32, 0x0FFFu);
+
+	// 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 (counter < 10)
+	{
+		LedD13::toggle();
+		modm::delay(100ms);
+		MODM_LOG_INFO << "loop: " << counter++ << modm::endl;
+	}
+
+	Iwdg::enable();
+
+	while (1)
+	{
+		LedD13::toggle();
+		modm::delay(500ms);
+		if (!Button::read()) { Iwdg::trigger(); }
+		MODM_LOG_INFO << "loop: " << counter++ << modm::endl;
+	}
+
+	return 0;
+}

examples/nucleo_f072rb/independend_watchdog/project.xml

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+<library>
+  <extends>modm:nucleo-f072rb</extends>
+  <options>
+    <option name="modm:build:build.path">../../../build/nucleo_f072rb/independend_watchdog</option>
+  </options>
+  <modules>
+    <module>modm:build:scons</module>
+    <module>modm:platform:iwdg</module>
+  </modules>
+</library>