[examples] Add ADS868x example

examples/nucleo_f429zi/adc_ads868x/main.cpp

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+/*
+ * Copyright (c) 2021, Raphael Lehmann
+ *
+ * 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/platform/spi/spi_master_1.hpp>
+#include <modm/driver/adc/ads868x.hpp>
+
+using namespace Board;
+
+using SpiMaster = SpiMaster1;
+using Mosi = GpioB5;
+using Miso = GpioB4;
+using Sck = GpioB3;
+using Cs = GpioA4;
+using Rst = GpioF12;
+
+using Ads868x = modm::Ads868x<SpiMaster, Cs, Rst>;
+
+Ads868x adc{};
+
+int
+main()
+{
+	Board::initialize();
+	Leds::setOutput();
+
+	MODM_LOG_INFO << "ADS868X Demo on Nucleo-F429ZI\n" << modm::endl;
+
+	SpiMaster::initialize<Board::SystemClock, 10_MHz>();
+	SpiMaster::connect<Sck::Sck, Mosi::Mosi, Miso::Miso>();
+
+	Rst::setOutput();
+	Cs::setOutput(true);
+
+	MODM_LOG_INFO << "Initializing ADC..." << modm::endl;
+	adc.initialize();
+
+	uint32_t counter(0);
+
+	while (true)
+	{
+		Leds::write(counter % ((1 << (Leds::width+1)) - 1));
+
+		uint16_t result = RF_CALL_BLOCKING(adc.singleConversion());
+		MODM_LOG_INFO.printf("ADC Manual: %05u\n", result);
+
+		modm::delay(Button::read() ? 1ms : 500ms);
+	}
+
+	return 0;
+}

examples/nucleo_f429zi/adc_ads868x/project.xml

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+<library>
+  <extends>modm:nucleo-f429zi</extends>
+  <options>
+    <option name="modm:build:build.path">../../../build/nucleo_f429zi/adc_ads868x</option>
+  </options>
+  <modules>
+    <module>modm:build:scons</module>
+    <module>modm:platform:spi:1</module>
+    <module>modm:driver:ads868x</module>
+  </modules>
+</library>