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diff --git a/Marlin/src/HAL/STM32/fastio.h b/Marlin/src/HAL/STM32/fastio.h
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+++ b/Marlin/src/HAL/STM32/fastio.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
+ * Copyright (c) 2017 Victor Perez
+ *
+ * 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
+
+/**
+ * Fast I/O interfaces for STM32
+ * These use GPIO register access for fast port manipulation.
+ */
+
+// ------------------------
+// Public Variables
+// ------------------------
+
+extern GPIO_TypeDef * FastIOPortMap[];
+
+// ------------------------
+// Public functions
+// ------------------------
+
+void FastIO_init(); // Must be called before using fast io macros
+
+// ------------------------
+// Defines
+// ------------------------
+
+#define _BV32(b) (1UL << (b))
+
+#ifndef PWM
+  #define PWM OUTPUT
+#endif
+
+#if defined(STM32F0xx) || defined(STM32F1xx) || defined(STM32F3xx) || defined(STM32L0xx) || defined(STM32L4xx)
+  #define _WRITE(IO, V) do { \
+    if (V) FastIOPortMap[STM_PORT(digitalPinToPinName(IO))]->BSRR = _BV32(STM_PIN(digitalPinToPinName(IO))) ; \
+    else   FastIOPortMap[STM_PORT(digitalPinToPinName(IO))]->BRR  = _BV32(STM_PIN(digitalPinToPinName(IO))) ; \
+  }while(0)
+#else
+  #define _WRITE(IO, V) (FastIOPortMap[STM_PORT(digitalPinToPinName(IO))]->BSRR = _BV32(STM_PIN(digitalPinToPinName(IO)) + ((V) ? 0 : 16)))
+#endif
+
+#define _READ(IO)               bool(READ_BIT(FastIOPortMap[STM_PORT(digitalPinToPinName(IO))]->IDR, _BV32(STM_PIN(digitalPinToPinName(IO)))))
+#define _TOGGLE(IO)             TBI32(FastIOPortMap[STM_PORT(digitalPinToPinName(IO))]->ODR, STM_PIN(digitalPinToPinName(IO)))
+
+#define _GET_MODE(IO)
+#define _SET_MODE(IO,M)         pinMode(IO, M)
+#define _SET_OUTPUT(IO)         pinMode(IO, OUTPUT)                               //!< Output Push Pull Mode & GPIO_NOPULL
+#define _SET_OUTPUT_OD(IO)      pinMode(IO, OUTPUT_OPEN_DRAIN)
+
+#define WRITE(IO,V)             _WRITE(IO,V)
+#define READ(IO)                _READ(IO)
+#define TOGGLE(IO)              _TOGGLE(IO)
+
+#define OUT_WRITE(IO,V)         do{ _SET_OUTPUT(IO); WRITE(IO,V); }while(0)
+#define OUT_WRITE_OD(IO,V)      do{ _SET_OUTPUT_OD(IO); WRITE(IO,V); }while(0)
+
+#define SET_INPUT(IO)           _SET_MODE(IO, INPUT)                              //!< Input Floating Mode
+#define SET_INPUT_PULLUP(IO)    _SET_MODE(IO, INPUT_PULLUP)                       //!< Input with Pull-up activation
+#define SET_INPUT_PULLDOWN(IO)  _SET_MODE(IO, INPUT_PULLDOWN)                     //!< Input with Pull-down activation
+#define SET_OUTPUT(IO)          OUT_WRITE(IO, LOW)
+#define SET_PWM(IO)             _SET_MODE(IO, PWM)
+
+#define IS_INPUT(IO)
+#define IS_OUTPUT(IO)
+
+#define PWM_PIN(P)              digitalPinHasPWM(P)
+#define NO_COMPILE_TIME_PWM
+
+// digitalRead/Write wrappers
+#define extDigitalRead(IO)    digitalRead(IO)
+#define extDigitalWrite(IO,V) digitalWrite(IO,V)