[example] Add MCP3008 SPI ADC example for SAMV71 Xplained Ultra

examples/samv71_xplained_ultra/mcp3008/main.cpp

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+/*
+ * Copyright (c) 2023, 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/driver/adc/mcp3008.hpp>
+#include <utility>
+
+using namespace Board;
+using namespace modm::platform;
+
+using SpiMaster = SpiMaster0;
+using Sck = GpioD22;
+using Mosi = GpioD21;
+using Miso = GpioD20;
+using Cs = GpioD25;
+
+int main()
+{
+	Board::initialize();
+
+	MODM_LOG_INFO << "MCP3004/8 ADC example" << modm::endl;
+
+	SpiMaster::connect<Sck::Spck, Mosi::Mosi, Miso::Miso>();
+	Cs::setOutput(true);
+
+	SpiMaster::initialize<SystemClock, 1500_kHz, 10_pct>();
+
+	modm::Mcp3008<SpiMaster, Cs> adc;
+	adc.initialize();
+
+	constexpr std::array channels = {
+		std::make_pair(0, modm::mcp3008::Channel::Ch0),
+		std::make_pair(1, modm::mcp3008::Channel::Ch1),
+		std::make_pair(2, modm::mcp3008::Channel::Ch2),
+		std::make_pair(3, modm::mcp3008::Channel::Ch3)
+	};
+
+	while (true) {
+		for (auto [i, ch] : channels) {
+			const auto value = RF_CALL_BLOCKING(adc.read(ch));
+			MODM_LOG_INFO << "channel " << i << ": " << value << '\n';
+		}
+
+		Led0::toggle();
+		Led1::toggle();
+		modm::delay(1s);
+	}
+
+	return 0;
+}

examples/samv71_xplained_ultra/mcp3008/project.xml

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+<library>
+  <extends>modm:samv71-xplained-ultra</extends>
+  <options>
+    <option name="modm:build:build.path">../../../build/samv71_xplained_ultra/mcp3008</option>
+  </options>
+  <modules>
+    <module>modm:build:scons</module>
+    <module>modm:driver:mcp3008</module>
+    <module>modm:platform:spi:0</module>
+  </modules>
+</library>