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diff --git a/Marlin/src/HAL/TEENSY35_36/HAL.h b/Marlin/src/HAL/TEENSY35_36/HAL.h
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+++ b/Marlin/src/HAL/TEENSY35_36/HAL.h
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+/**
+ * Marlin 3D Printer Firmware
+ *
+ * Copyright (c) 2020 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
+ * Copyright (c) 2016 Bob Cousins bobcousins42@googlemail.com
+ * Copyright (c) 2015-2016 Nico Tonnhofer wurstnase.reprap@gmail.com
+ *
+ * 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 for Teensy 3.5 (MK64FX512) and Teensy 3.6 (MK66FX1M0)
+ */
+
+#define CPU_32_BIT
+
+#include "../shared/Marduino.h"
+#include "../shared/math_32bit.h"
+#include "../shared/HAL_SPI.h"
+
+#include "fastio.h"
+#include "watchdog.h"
+
+#include <stdint.h>
+#include <util/atomic.h>
+
+#define ST7920_DELAY_1 DELAY_NS(600)
+#define ST7920_DELAY_2 DELAY_NS(750)
+#define ST7920_DELAY_3 DELAY_NS(750)
+
+// ------------------------
+// Defines
+// ------------------------
+
+#define IS_32BIT_TEENSY 1
+#define IS_TEENSY_35_36 1
+#ifdef __MK66FX1M0__
+  #define IS_TEENSY36 1
+#else // __MK64FX512__
+  #define IS_TEENSY35 1
+#endif
+
+#include "../../core/serial_hook.h"
+typedef Serial0Type<decltype(Serial)> DefaultSerial;
+extern DefaultSerial MSerial;
+typedef ForwardSerial0Type<decltype(SerialUSB)> USBSerialType;
+extern USBSerialType USBSerial;
+
+#define _MSERIAL(X) MSerial##X
+#define MSERIAL(X) _MSERIAL(X)
+#define MSerial0 MSerial
+
+#if SERIAL_PORT == -1
+  #define MYSERIAL0 USBSerial
+#elif WITHIN(SERIAL_PORT, 0, 3)
+  #define MYSERIAL0 MSERIAL(SERIAL_PORT)
+#endif
+
+#define HAL_SERVO_LIB libServo
+
+typedef int8_t pin_t;
+
+#ifndef analogInputToDigitalPin
+  #define analogInputToDigitalPin(p) ((p < 12U) ? (p) + 54U : -1)
+#endif
+
+#define CRITICAL_SECTION_START()  uint32_t primask = __get_primask(); __disable_irq()
+#define CRITICAL_SECTION_END()    if (!primask) __enable_irq()
+#define ISRS_ENABLED() (!__get_primask())
+#define ENABLE_ISRS()  __enable_irq()
+#define DISABLE_ISRS() __disable_irq()
+
+#undef sq
+#define sq(x) ((x)*(x))
+
+inline void HAL_init() {}
+
+// Clear reset reason
+void HAL_clear_reset_source();
+
+// Reset reason
+uint8_t HAL_get_reset_source();
+
+inline void HAL_reboot() {}  // reboot the board or restart the bootloader
+
+FORCE_INLINE void _delay_ms(const int delay_ms) { delay(delay_ms); }
+
+#if GCC_VERSION <= 50000
+  #pragma GCC diagnostic push
+  #pragma GCC diagnostic ignored "-Wunused-function"
+#endif
+
+extern "C" int freeMemory();
+
+#if GCC_VERSION <= 50000
+  #pragma GCC diagnostic pop
+#endif
+
+// ADC
+
+void HAL_adc_init();
+
+#define HAL_ADC_VREF         3.3
+#define HAL_ADC_RESOLUTION  10
+#define HAL_START_ADC(pin)  HAL_adc_start_conversion(pin)
+#define HAL_READ_ADC()      HAL_adc_get_result()
+#define HAL_ADC_READY()     true
+
+#define HAL_ANALOG_SELECT(pin)
+
+void HAL_adc_start_conversion(const uint8_t adc_pin);
+uint16_t HAL_adc_get_result();
+
+#define GET_PIN_MAP_PIN(index) index
+#define GET_PIN_MAP_INDEX(pin) pin
+#define PARSED_PIN_INDEX(code, dval) parser.intval(code, dval)