[examples] Add STM32F030 ADC example

examples/stm32f030f4p6_demo_board/adc/main.cpp

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+/*
+ * Copyright (c) 2020, 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>
+
+using namespace Board;
+
+int
+main()
+{
+	Board::initialize();
+
+	Adc::initialize<Board::SystemClock, Adc::ClockMode::Synchronous, 12_MHz>();
+	const uint16_t Vref = Adc::readInternalVoltageReference();
+
+	while (true)
+	{
+		int16_t Temp = Adc::readTemperature(Vref);
+		LedOrange::set(Temp > 30);
+		modm::delay(1s);
+	}
+
+	return 0;
+}

examples/stm32f030f4p6_demo_board/adc/openocd.cfg

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+# Replace this with your custom programmer
+source [find interface/stlink-v2.cfg]

examples/stm32f030f4p6_demo_board/adc/project.xml

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+<library>
+  <extends>modm:stm32f030_demo</extends>
+  <options>
+    <option name="modm:build:build.path">../../../build/stm32f030f4p6_demo/adc</option>
+    <option name="modm:build:openocd.cfg">openocd.cfg</option>
+  </options>
+  <modules>
+    <module>modm:build:scons</module>
+    <module>modm:platform:adc</module>
+  </modules>
+</library>