[examples] Nucleo-F042K6: SPI-DMA example

examples/nucleo_f042k6/spi_dma/main.cpp

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+/*
+ * Copyright (c) 2020, Mike Wolfram
+ * 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>
+
+using Mosi = GpioOutputB5;
+using Miso = GpioInputB4;
+using Sck = GpioOutputB3;
+using DmaRx = Dma1::Channel2;
+using DmaTx = Dma1::Channel3;
+using Spi = SpiMaster1_Dma<DmaRx, DmaTx>;
+
+int main()
+{
+	Board::initialize();
+
+	Dma1::enable();
+	Spi::connect<Mosi::Mosi, Miso::Miso, Sck::Sck>();
+	Spi::initialize<Board::SystemClock, 12_MHz>();
+
+	while (true)
+	{
+		uint8_t sendBuffer[13] { "data to send" };
+		uint8_t receiveBuffer[13];
+
+		// send out 12 bytes, don't care about response
+		Spi::transferBlocking(sendBuffer, nullptr, 12);
+
+		// send out 12 bytes, read in 12 bytes
+		Spi::transferBlocking(sendBuffer, receiveBuffer, 12);
+	}
+
+	return 0;
+}

examples/nucleo_f042k6/spi_dma/project.xml

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+<library>
+  <extends>modm:nucleo-f042k6</extends>
+  <options>
+    <option name="modm:build:build.path">../../../build/nucleo_f042k6/spi_dma</option>
+  </options>
+  <modules>
+    <module>modm:platform:gpio</module>
+    <module>modm:platform:dma</module>
+    <module>modm:platform:spi:1</module>
+    <module>modm:build:scons</module>
+  </modules>
+</library>