chepo92

Marlin HAL

Hardware Abstraction Layer

A Hardware Abstraction Layer allows applications to discover and use the hardware of the host system through a simple, portable and abstract API, regardless of the type of the underlying hardware. (Pennington H., 2003)

Marlin 1.0 was originally derived from Sprinter and GRBL which could only run on 8-bit AVR boards. With the proliferation of new boards based on a variety of processor architectures, for Marlin 2.0 we decided to keep the existing code, but add architecture-specific HALs (AVR, SAM, STM, ESP) as a bridge between Marlin’s high-level code and the low-level functions that control the microcontroller’s pins, ports, timers, etc.

This way all the existing high-level Marlin code can work on any platform without needing to be concerned about the details. Retaining AVR compatibility and a single codebase is important to us, because we want to make sure that features and patches get as much testing and attention as possible, and that all platforms always benefit from the latest improvements.

Current Marlin HALs

AVR (8-bit)

board processor speed flash sram logic fpu
Arduino AVR ATmega, ATTiny, etc. 16-20MHz 64-256k 2-16k 5V no

DUE

boards processor speed flash sram logic fpu
Arduino Due, RAMPS-FD, etc. SAM3X8E ARM-Cortex M3 84MHz 512k 64+32k 3.3V no

ESP32

board processor speed flash sram logic fpu
ESP32 Tensilica Xtensa LX6 240MHz 3.3V

LPC1768 / LPC1769

boards processor speed flash sram logic fpu
Re-ARM LPC1768 ARM-Cortex M3 100MHz 512k 32+16+16k 3.3-5V no
MKS SBASE LPC1768 ARM-Cortex M3 100MHz 512k 32+16+16k 3.3-5V no
Selena Compact LPC1768 ARM-Cortex M3 100MHz 512k 32+16+16k 3.3-5V no
Azteeg X5 GT LPC1769 ARM-Cortex M3 120MHz 512k 32+16+16k 3.3-5V no
Smoothieboard LPC1769 ARM-Cortex M3 120MHz 512k 64k 3.3-5V no

SAMD51

boards processor speed flash sram logic fpu
Adafruit Grand Central M4 SAMD51P20A ARM-Cortex M4 120MHz 1M 256k 3.3V yes

STM32F1

boards processor speed flash sram logic fpu
Arduino STM32 STM32F1 ARM-Cortex M3 72MHz 256-512k 48-64k 3.3V no
Geetech GTM32 STM32F1 ARM-Cortex M3 72MHz 256-512k 48-64k 3.3V no

STM32F4

boards processor speed flash sram logic fpu
STEVAL-3DP001V1 STM32F401VE Arm-Cortex M4 84MHz 512k 64+32k 3.3-5V yes

Teensy++ 2.0

boards processor speed flash sram logic fpu
Teensy++ 2.0 AT90USB1286 16MHz 128k 8k 5V no

Teensy 3.1 / 3.2

boards processor speed flash sram logic fpu
Teensy 3.2 MK20DX256VLH7 ARM-Cortex M4 72MHz 256k 32k 3.3V-5V yes

Teensy 3.5 / 3.6

boards processor speed flash sram logic fpu
Teensy 3.5 MK64FX512VMD12 ARM-Cortex M4 120MHz 512k 192k 3.3-5V yes
Teensy 3.6 MK66FX1M0VMD18 ARM-Cortex M4 180MHz 1M 256k 3.3V yes