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diff --git a/Marlin/src/HAL/TEENSY40_41/fastio.h b/Marlin/src/HAL/TEENSY40_41/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 Teensy 4.0 (IMXRT1062DVL6A) / 4.1 (IMXRT1062DVJ6A)
+ * These use GPIO functions instead of Direct Port Manipulation, as on AVR.
+ */
+
+#ifndef PWM
+  #define PWM OUTPUT
+#endif
+
+#define READ(IO)                digitalRead(IO)
+#define WRITE(IO,V)             digitalWrite(IO,V)
+
+#define _GET_MODE(IO)           !is_output(IO)
+#define _SET_MODE(IO,M)         pinMode(IO, M)
+#define _SET_OUTPUT(IO)         pinMode(IO, OUTPUT)                               /*!< Output Push Pull Mode & GPIO_NOPULL   */
+
+#define OUT_WRITE(IO,V)         do{ _SET_OUTPUT(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 TOGGLE(IO)              OUT_WRITE(IO, !READ(IO))
+
+#define IS_INPUT(IO)            !is_output(IO)
+#define IS_OUTPUT(IO)           is_output(IO)
+
+#define PWM_PIN(P)            digitalPinHasPWM(P)
+
+// digitalRead/Write wrappers
+#define extDigitalRead(IO)    digitalRead(IO)
+#define extDigitalWrite(IO,V) digitalWrite(IO,V)