[example] Add generic RTC for most STM32 boards

examples/generic/rtc/main.cpp

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+// coding: utf-8
+/*
+ * Copyright (c) 2023, Rasmus Kleist Hørlyck Sørensen
+ * Copyright (c) 2024, 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>
+
+int
+main()
+{
+	Board::initialize();
+	Board::Leds::setOutput();
+#ifdef MODM_BOARD_HAS_LOGGER
+	MODM_LOG_INFO << "Initialize RTC" << modm::endl;
+#endif
+	const bool inited = Rtc::initialize<Board::SystemClock>();
+#ifdef MODM_BOARD_HAS_LOGGER
+	if (not inited) { MODM_LOG_INFO << "RTC was already initialized." << modm::endl; }
+#endif
+
+	constexpr auto cdt = modm::DateTime::fromBuildTime();
+	if (Rtc::dateTime() < cdt) Rtc::setDateTime(cdt);
+#ifdef MODM_BOARD_HAS_LOGGER
+	MODM_LOG_INFO << "Compile DateTime: " << cdt << modm::endl;
+	MODM_LOG_INFO << "YMD: " << cdt.year_month_day() << modm::endl;
+	MODM_LOG_INFO << "HMS: " << cdt.hh_mm_ss() << modm::endl;
+	MODM_LOG_INFO << "Weekday: " << cdt.weekday() << modm::endl;
+#endif
+
+
+	while (true)
+	{
+		const auto dt = Rtc::dateTime();
+#ifdef MODM_BOARD_HAS_LOGGER
+		const auto now = Rtc::now();
+		MODM_LOG_INFO << dt << " (" << dt.weekday() << ") = " << now << " since 1970" << modm::endl;
+		modm::delay(1.1s);
+#else
+		static uint8_t prev_second{};
+		if (prev_second != dt.seconds().count())
+		{
+			prev_second = dt.seconds().count();
+			Board::Leds::toggle();
+		}
+		modm::delay(10ms);
+#endif
+
+	}
+
+	return 0;
+}

examples/generic/rtc/openocd.cfg

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+# Replace this with your custom programmer
+source [find interface/stlink.cfg]

examples/generic/rtc/project.xml

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+<library>
+	<!-- <extends>modm:nucleo-c031c6</extends> -->
+
+	<!-- <extends>modm:nucleo-g071rb</extends> -->
+
+	<!-- <extends>modm:stm32f030_demo</extends> -->
+	<!-- <extends>modm:disco-f051r8</extends> -->
+	<!-- <extends>modm:disco-f072rb</extends> -->
+	<!-- <extends>modm:nucleo-f072rb</extends> -->
+	<!-- <extends>modm:nucleo-f091rc</extends> -->
+
+	<!-- <extends>modm:nucleo-l053r8</extends> -->
+	<!-- <extends>modm:nucleo-l152re</extends> -->
+	<!-- <extends>modm:disco-l152rc</extends> -->
+	<!-- <extends>modm:nucleo-l476rg</extends> -->
+	<!-- <extends>modm:disco-l476vg</extends> -->
+
+	<!-- <extends>modm:disco-f303vc</extends> -->
+	<!-- <extends>modm:nucleo-f334r8</extends> -->
+
+
+	<!-- <extends>modm:black-pill-f401</extends> -->
+	<!-- <extends>modm:nucleo-f401re</extends> -->
+	<!-- <extends>modm:disco-f407vg</extends> -->
+	<!-- <extends>modm:black-pill-f411</extends> -->
+	<!-- <extends>modm:nucleo-f411re</extends> -->
+	<!-- <extends>modm:nucleo-f429zi</extends> -->
+	<!-- <extends>modm:disco-f429zi</extends> -->
+	<!-- <extends>modm:nucleo-f446re</extends> -->
+	<!-- <extends>modm:disco-f469ni</extends> -->
+
+	<!-- <extends>modm:nucleo-g474re</extends> -->
+
+	<!-- <extends>modm:disco-f746ng</extends> -->
+	<!-- <extends>modm:nucleo-h723zg</extends> -->
+	<!-- <extends>modm:nucleo-h743zi</extends> -->
+	<extends>modm:nucleo-u575zi-q</extends>
+	<options>
+		<option name="modm:build:build.path">../../../build/generic/rtc</option>
+		<!-- <option name="modm:build:openocd.cfg">openocd.cfg</option> -->
+	</options>
+	<modules>
+		<module>modm:platform:rtc</module>
+		<module>modm:build:scons</module>
+	</modules>
+</library>