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diff --git a/Marlin/src/HAL/ESP32/fastio.h b/Marlin/src/HAL/ESP32/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
+ *
+ * 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
+
+#include "i2s.h"
+
+/**
+ * Utility functions
+ */
+
+// I2S expander pin mapping.
+#define IS_I2S_EXPANDER_PIN(IO) TEST(IO, 7)
+#define I2S_EXPANDER_PIN_INDEX(IO) (IO & 0x7F)
+
+// Set pin as input
+#define _SET_INPUT(IO)          pinMode(IO, INPUT)
+
+// Set pin as output
+#define _SET_OUTPUT(IO)         pinMode(IO, OUTPUT)
+
+// Set pin as input with pullup mode
+#define _PULLUP(IO, v)          pinMode(IO, v ? INPUT_PULLUP : INPUT)
+
+// Read a pin wrapper
+#define READ(IO)                (IS_I2S_EXPANDER_PIN(IO) ? i2s_state(I2S_EXPANDER_PIN_INDEX(IO)) : digitalRead(IO))
+
+// Write to a pin wrapper
+#define WRITE(IO, v)            (IS_I2S_EXPANDER_PIN(IO) ? i2s_write(I2S_EXPANDER_PIN_INDEX(IO), v) : digitalWrite(IO, v))
+
+// Set pin as input wrapper
+#define SET_INPUT(IO)           _SET_INPUT(IO)
+
+// Set pin as input with pullup wrapper
+#define SET_INPUT_PULLUP(IO)    do{ _SET_INPUT(IO); _PULLUP(IO, HIGH); }while(0)
+
+// Set pin as input with pulldown (substitution)
+#define SET_INPUT_PULLDOWN      SET_INPUT
+
+// Set pin as output wrapper
+#define SET_OUTPUT(IO)          do{ _SET_OUTPUT(IO); }while(0)
+
+// Set pin as PWM
+#define SET_PWM                 SET_OUTPUT
+
+// Set pin as output and init
+#define OUT_WRITE(IO,V)         do{ _SET_OUTPUT(IO); WRITE(IO,V); }while(0)
+
+// digitalRead/Write wrappers
+#define extDigitalRead(IO)      digitalRead(IO)
+#define extDigitalWrite(IO,V)   digitalWrite(IO,V)
+
+// PWM outputs
+#define PWM_PIN(P)              (P < 34 || P > 127) // NOTE Pins >= 34 are input only on ESP32, so they can't be used for output.
+
+// Toggle pin value
+#define TOGGLE(IO)              WRITE(IO, !READ(IO))
+
+//
+// Ports and functions
+//
+
+// UART
+#define RXD        3
+#define TXD        1
+
+// TWI (I2C)
+#define SCL        5
+#define SDA        4