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diff --git a/Marlin/src/HAL/shared/HAL_SPI.h b/Marlin/src/HAL/shared/HAL_SPI.h
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+/**
+ * Marlin 3D Printer Firmware
+ * Copyright (c) 2020 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
+ *
+ * Based on Sprinter and grbl.
+ * Copyright (c) 2011 Camiel Gubbels / Erik van der Zalm
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ *
+ */
+#pragma once
+
+/**
+ * HAL/shared/HAL_SPI.h
+ * Core Marlin definitions for SPI, implemented in the HALs
+ */
+
+#include "Marduino.h"
+#include <stdint.h>
+
+/**
+ * SPI speed where 0 <= index <= 6
+ *
+ * Approximate rates :
+ *
+ *  0 :  8 - 10 MHz
+ *  1 :  4 - 5 MHz
+ *  2 :  2 - 2.5 MHz
+ *  3 :  1 - 1.25 MHz
+ *  4 :  500 - 625 kHz
+ *  5 :  250 - 312 kHz
+ *  6 :  125 - 156 kHz
+ *
+ *  On AVR, actual speed is F_CPU/2^(1 + index).
+ *  On other platforms, speed should be in range given above where possible.
+ */
+
+#define SPI_FULL_SPEED      0   // Set SCK to max rate
+#define SPI_HALF_SPEED      1   // Set SCK rate to half of max rate
+#define SPI_QUARTER_SPEED   2   // Set SCK rate to quarter of max rate
+#define SPI_EIGHTH_SPEED    3   // Set SCK rate to 1/8 of max rate
+#define SPI_SIXTEENTH_SPEED 4   // Set SCK rate to 1/16 of max rate
+#define SPI_SPEED_5         5   // Set SCK rate to 1/32 of max rate
+#define SPI_SPEED_6         6   // Set SCK rate to 1/64 of max rate
+
+//
+// Standard SPI functions
+//
+
+// Initialize SPI bus
+void spiBegin();
+
+// Configure SPI for specified SPI speed
+void spiInit(uint8_t spiRate);
+
+// Write single byte to SPI
+void spiSend(uint8_t b);
+
+// Read single byte from SPI
+uint8_t spiRec();
+
+// Read from SPI into buffer
+void spiRead(uint8_t* buf, uint16_t nbyte);
+
+// Write token and then write from 512 byte buffer to SPI (for SD card)
+void spiSendBlock(uint8_t token, const uint8_t* buf);
+
+// Begin SPI transaction, set clock, bit order, data mode
+void spiBeginTransaction(uint32_t spiClock, uint8_t bitOrder, uint8_t dataMode);
+
+//
+// Extended SPI functions taking a channel number (Hardware SPI only)
+//
+
+// Write single byte to specified SPI channel
+void spiSend(uint32_t chan, byte b);
+
+// Write buffer to specified SPI channel
+void spiSend(uint32_t chan, const uint8_t* buf, size_t n);
+
+// Read single byte from specified SPI channel
+uint8_t spiRec(uint32_t chan);