[examples] Add rp2040 Pico simple ADC

examples/rp_pico/adc_simple/main.cpp

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+/*
+ * Copyright (c) 2022, Nikolay Semenov
+ *
+ * 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>
+#include <modm/platform.hpp>
+
+int
+main()
+{
+	Board::initialize();
+
+	using Led = Board::LedGreen;
+	Led::setOutput(true);
+
+	Uart0::connect<GpioOutput0::Tx>();
+	Uart0::initialize<Board::SystemClock, 115200_Bd>();
+
+	modm::IODeviceWrapper<Uart0, modm::IOBuffer::BlockIfFull> loggerDevice;
+	modm::IOStream out(loggerDevice);
+
+	Adc::connect<GpioInput26::In0, GpioInput27::In1, GpioInput28::In2, GpioInput29::In3>();
+	Adc::initialize();
+	Adc::enableTemperatureSensor();
+
+	while (true)
+	{
+		out.printf("---\r\n");
+		for (uint8_t ch = 0; ch < (uint8_t)Adc::Channel::Ch3; ++ch)
+		{
+			auto value = Adc::readChannel((Adc::Channel)ch);
+			out.printf("ADC Channel %u %f V | 0x%04x %u\r\n", ch, Adc::convertToVoltage(value),
+					   value, value);
+		}
+		{
+			auto value = Adc::readChannel(Adc::Channel::Ch3);
+			out.printf("ADC VSYS      %f V | 0x%04x %u\r\n", 3.f * Adc::convertToVoltage(value),
+					   value, value);
+		}
+		{
+			auto value = Adc::readChannel(Adc::Channel::Temperature);
+			out.printf("ADC Int Temp  %.4f C | 0x%04x %u\r\n", Adc::convertToTemperature(value),
+					   value, value);
+		}
+		modm::delay(250ms);
+		Led::toggle();
+	}
+
+	return 0;
+}

examples/rp_pico/adc_simple/project.xml

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+<library>
+  <extends>modm:rp-pico</extends>
+  <options>
+    <option name="modm:build:build.path">../../../build/rp_pico/adc_simple</option>
+  </options>
+  <modules>
+    <module>modm:io</module>
+    <module>modm:platform:adc</module>
+    <module>modm:platform:uart:0</module>
+    <module>modm:build:scons</module>
+  </modules>
+</library>