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diff --git a/Marlin/src/HAL/STM32/HAL.h b/Marlin/src/HAL/STM32/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
+ * 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
+
+#define CPU_32_BIT
+
+#include "../../core/macros.h"
+#include "../shared/Marduino.h"
+#include "../shared/math_32bit.h"
+#include "../shared/HAL_SPI.h"
+#include "fastio.h"
+#include "Servo.h"
+#include "watchdog.h"
+#include "MarlinSerial.h"
+
+#include "../../inc/MarlinConfigPre.h"
+
+#include <stdint.h>
+
+#ifdef USBCON
+  #include <USBSerial.h>
+  #include "../../core/serial_hook.h"
+  typedef ForwardSerial0Type< decltype(SerialUSB) > DefaultSerial;
+  extern DefaultSerial MSerial;
+#endif
+
+// ------------------------
+// Defines
+// ------------------------
+#define _MSERIAL(X) MSerial##X
+#define MSERIAL(X) _MSERIAL(X)
+
+#if SERIAL_PORT == -1
+  #define MYSERIAL0 MSerial
+#elif WITHIN(SERIAL_PORT, 1, 6)
+  #define MYSERIAL0 MSERIAL(SERIAL_PORT)
+#else
+  #error "SERIAL_PORT must be -1 or from 1 to 6. Please update your configuration."
+#endif
+
+#ifdef SERIAL_PORT_2
+  #if SERIAL_PORT_2 == -1
+    #define MYSERIAL1 MSerial
+  #elif WITHIN(SERIAL_PORT_2, 1, 6)
+    #define MYSERIAL1 MSERIAL(SERIAL_PORT_2)
+  #else
+    #error "SERIAL_PORT_2 must be -1 or from 1 to 6. Please update your configuration."
+  #endif
+#endif
+
+#ifdef MMU2_SERIAL_PORT
+  #if MMU2_SERIAL_PORT == -1
+    #define MMU2_SERIAL MSerial
+  #elif WITHIN(MMU2_SERIAL_PORT, 1, 6)
+    #define MMU2_SERIAL MSERIAL(MMU2_SERIAL_PORT)
+  #else
+    #error "MMU2_SERIAL_PORT must be -1 or from 1 to 6. Please update your configuration."
+  #endif
+#endif
+
+#ifdef LCD_SERIAL_PORT
+  #if LCD_SERIAL_PORT == -1
+    #define LCD_SERIAL MSerial
+  #elif WITHIN(LCD_SERIAL_PORT, 1, 6)
+    #define LCD_SERIAL MSERIAL(LCD_SERIAL_PORT)
+  #else
+    #error "LCD_SERIAL_PORT must be -1 or from 1 to 6. Please update your configuration."
+  #endif
+  #if HAS_DGUS_LCD
+    #define SERIAL_GET_TX_BUFFER_FREE() LCD_SERIAL.availableForWrite()
+  #endif
+#endif
+
+/**
+ * TODO: review this to return 1 for pins that are not analog input
+ */
+#ifndef analogInputToDigitalPin
+  #define analogInputToDigitalPin(p) (p)
+#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()
+#define cli() __disable_irq()
+#define sei() __enable_irq()
+
+// On AVR this is in math.h?
+#define square(x) ((x)*(x))
+
+// ------------------------
+// Types
+// ------------------------
+
+typedef int16_t pin_t;
+
+#define HAL_SERVO_LIB libServo
+#define PAUSE_SERVO_OUTPUT() libServo::pause_all_servos()
+#define RESUME_SERVO_OUTPUT() libServo::resume_all_servos()
+
+// ------------------------
+// Public Variables
+// ------------------------
+
+// result of last ADC conversion
+extern uint16_t HAL_adc_result;
+
+// ------------------------
+// Public functions
+// ------------------------
+
+// Memory related
+#define __bss_end __bss_end__
+
+// Enable hooks into  setup for HAL
+void HAL_init();
+#define HAL_IDLETASK 1
+void HAL_idletask();
+
+// 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
+
+void _delay_ms(const int delay);
+
+extern "C" char* _sbrk(int incr);
+
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wunused-function"
+
+static inline int freeMemory() {
+  volatile char top;
+  return &top - reinterpret_cast<char*>(_sbrk(0));
+}
+
+#pragma GCC diagnostic pop
+
+//
+// ADC
+//
+
+#define HAL_ANALOG_SELECT(pin) pinMode(pin, INPUT)
+
+#define HAL_ADC_VREF         3.3
+#define HAL_ADC_RESOLUTION  ADC_RESOLUTION // 12
+#define HAL_START_ADC(pin)  HAL_adc_start_conversion(pin)
+#define HAL_READ_ADC()      HAL_adc_result
+#define HAL_ADC_READY()     true
+
+inline void HAL_adc_init() { analogReadResolution(HAL_ADC_RESOLUTION); }
+
+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)
+
+#ifdef STM32F1xx
+  #define JTAG_DISABLE() AFIO_DBGAFR_CONFIG(AFIO_MAPR_SWJ_CFG_JTAGDISABLE)
+  #define JTAGSWD_DISABLE() AFIO_DBGAFR_CONFIG(AFIO_MAPR_SWJ_CFG_DISABLE)
+#endif
+
+#define PLATFORM_M997_SUPPORT
+void flashFirmware(const int16_t);
+
+// Maple Compatibility
+typedef void (*systickCallback_t)(void);
+void systick_attach_callback(systickCallback_t cb);
+void HAL_SYSTICK_Callback();
+extern volatile uint32_t systick_uptime_millis;
+
+#define HAL_CAN_SET_PWM_FREQ   // This HAL supports PWM Frequency adjustment
+
+/**
+ * set_pwm_frequency
+ *  Set the frequency of the timer corresponding to the provided pin
+ *  All Timer PWM pins run at the same frequency
+ */
+void set_pwm_frequency(const pin_t pin, int f_desired);
+
+/**
+ * set_pwm_duty
+ *  Set the PWM duty cycle of the provided pin to the provided value
+ *  Optionally allows inverting the duty cycle [default = false]
+ *  Optionally allows changing the maximum size of the provided value to enable finer PWM duty control [default = 255]
+ */
+void set_pwm_duty(const pin_t pin, const uint16_t v, const uint16_t v_size=255, const bool invert=false);