[example] Add SAMV71 ADC example

examples/samv71_xplained_ultra/adc/main.cpp

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+/*
+ * Copyright (c) 2021, Jeff McBride
+ * Copyright (c) 2022, Christopher Durand
+ *
+ * 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/io/iostream.hpp>
+
+using namespace modm::platform;
+using namespace modm::literals;
+
+using Ad2 = GpioA19::Ad; // channel 0, pin AD2 on board
+using Ad3 = GpioD30::Ad; // channel 8, pin AD3 on board
+
+int main()
+{
+	Board::initialize();
+
+	Afec0::initialize<Board::SystemClock>();
+	Afec0::connect<Ad2::Ad, Ad3::Ad>();
+
+	while (true)
+	{
+		MODM_LOG_INFO << "ADC Readings: ";
+		MODM_LOG_INFO.printf("%5d ", Afec0::readChannel(Afec0::getPinChannel<Ad2>()));
+		MODM_LOG_INFO.printf("%5d ", Afec0::readChannel(Afec0::getPinChannel<Ad3>()));
+		MODM_LOG_INFO << modm::endl;
+
+		modm::delay(500ms);
+	}
+}

examples/samv71_xplained_ultra/adc/project.xml

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+<library>
+  <extends>modm:samv71-xplained-ultra</extends>
+  <options>
+    <option name="modm:build:build.path">../../../build/samv71_xplained_ultra/adc</option>
+  </options>
+  <modules>
+    <module>modm:build:scons</module>
+    <module>modm:platform:adc:0</module>
+  </modules>
+</library>