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diff --git a/Marlin/src/HAL/TEENSY35_36/HAL.cpp b/Marlin/src/HAL/TEENSY35_36/HAL.cpp
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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/>.
+ *
+ */
+
+/**
+ * HAL for Teensy 3.5 (MK64FX512) and Teensy 3.6 (MK66FX1M0)
+ */
+
+#if defined(__MK64FX512__) || defined(__MK66FX1M0__)
+
+#include "HAL.h"
+#include "../shared/Delay.h"
+
+#include <Wire.h>
+
+DefaultSerial MSerial(false);
+USBSerialType USBSerial(false, SerialUSB);
+
+uint16_t HAL_adc_result, HAL_adc_select;
+
+static const uint8_t pin2sc1a[] = {
+  5, 14, 8, 9, 13, 12, 6, 7, 15, 4, 3, 19+128, 14+128, 15+128, // 0-13 -> A0-A13
+  5, 14, 8, 9, 13, 12, 6, 7, 15, 4, // 14-23 are A0-A9
+  255, 255, 255, 255, 255, 255, 255, // 24-30 are digital only
+  14+128, 15+128, 17, 18, 4+128, 5+128, 6+128, 7+128, 17+128,  // 31-39 are A12-A20
+  255, 255, 255, 255, 255, 255, 255, 255, 255,  // 40-48 are digital only
+  10+128, 11+128, // 49-50 are A23-A24
+  255, 255, 255, 255, 255, 255, 255, // 51-57 are digital only
+  255, 255, 255, 255, 255, 255, // 58-63 (sd card pins) are digital only
+  3, 19+128, // 64-65 are A10-A11
+  23, 23+128,// 66-67 are A21-A22 (DAC pins)
+  1, 1+128,  // 68-69 are A25-A26 (unused USB host port on Teensy 3.5)
+  26,        // 70 is Temperature Sensor
+  18+128     // 71 is Vref
+};
+
+/*
+  // disable interrupts
+  void cli() { noInterrupts(); }
+
+  // enable interrupts
+  void sei() { interrupts(); }
+*/
+
+void HAL_adc_init() {
+  analog_init();
+  while (ADC0_SC3 & ADC_SC3_CAL) {}; // Wait for calibration to finish
+  while (ADC1_SC3 & ADC_SC3_CAL) {}; // Wait for calibration to finish
+  NVIC_ENABLE_IRQ(IRQ_FTM1);
+}
+
+void HAL_clear_reset_source() { }
+
+uint8_t HAL_get_reset_source() {
+  switch (RCM_SRS0) {
+    case 128: return RST_POWER_ON; break;
+    case 64: return RST_EXTERNAL; break;
+    case 32: return RST_WATCHDOG; break;
+    // case 8: return RST_LOSS_OF_LOCK; break;
+    // case 4: return RST_LOSS_OF_CLOCK; break;
+    // case 2: return RST_LOW_VOLTAGE; break;
+  }
+  return 0;
+}
+
+extern "C" {
+  extern char __bss_end;
+  extern char __heap_start;
+  extern void* __brkval;
+
+  int freeMemory() {
+    int free_memory;
+    if ((int)__brkval == 0)
+      free_memory = ((int)&free_memory) - ((int)&__bss_end);
+    else
+      free_memory = ((int)&free_memory) - ((int)__brkval);
+    return free_memory;
+  }
+}
+
+void HAL_adc_start_conversion(const uint8_t adc_pin) {
+  const uint16_t pin = pin2sc1a[adc_pin];
+  if (pin == 0xFF) {
+    // Digital only
+    HAL_adc_select = -1;
+  }
+  else if (pin & 0x80) {
+    HAL_adc_select = 1;
+    ADC1_SC1A = pin & 0x7F;
+  }
+  else {
+    HAL_adc_select = 0;
+    ADC0_SC1A = pin;
+  }
+}
+
+uint16_t HAL_adc_get_result() {
+  switch (HAL_adc_select) {
+    case 0: return ADC0_RA;
+    case 1: return ADC1_RA;
+  }
+  return 0;
+}
+
+#endif // __MK64FX512__ || __MK66FX1M0__