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diff --git a/Marlin/src/HAL/TEENSY31_32/HAL.cpp b/Marlin/src/HAL/TEENSY31_32/HAL.cpp
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+++ b/Marlin/src/HAL/TEENSY31_32/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 3.2 (MK20DX256)
+ */
+
+#ifdef __MK20DX256__
+
+#include "HAL.h"
+#include "../shared/Delay.h"
+
+#include <Wire.h>
+
+DefaultSerial MSerial(false);
+USBSerialType USBSerial(false, SerialUSB);
+
+uint16_t HAL_adc_result;
+
+static const uint8_t pin2sc1a[] = {
+    5, 14, 8, 9, 13, 12, 6, 7, 15, 4, 0, 19, 3, 31, // 0-13, we treat them as A0-A13
+    5, 14, 8, 9, 13, 12, 6, 7, 15, 4, // 14-23 (A0-A9)
+    31, 31, 31, 31, 31, 31, 31, 31, 31, 31, // 24-33
+    0+64, 19+64, 3+64, 31+64, // 34-37 (A10-A13)
+    26, 22, 23, 27, 29, 30 // 38-43: temp. sensor, VREF_OUT, A14, bandgap, VREFH, VREFL. A14 isn't connected to anything in Teensy 3.0.
+};
+
+/*
+  // 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
+  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) { ADC0_SC1A = pin2sc1a[adc_pin]; }
+
+uint16_t HAL_adc_get_result() { return ADC0_RA; }
+
+#endif // __MK20DX256__