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grblHAL

  • Software
  • Robot arms and industry
  • Firmware

grblHAL is a high-performance G-code motion controller firmware for CNC machines, a port and rewrite of grbl 1.1f for 32-bit microcontrollers.

Made by grblHAL.

Source on GitHub: github.com/grblHAL/core (opens in a new tab). Facts read at commit 4ec1ae4 (opens in a new tab).

Licenses

Code
GPL-3.0-only (opens in a new tab)

Read by Robotheca from COPYING (opens in a new tab) (GPL-3.0-only) at commit 4ec1ae4 (opens in a new tab), on 16 Oct 2026.

Commercial use
Yes

Copyleft: Modified source must be published.

What it does

  • Runs on ARM and other 32-bit MCUs, with drivers for more than 15 processor families sharing one core codebase.
  • Produces precise control pulses, up to 300kHz depending on driver and processor.
  • Accepts standards-compliant G-code, including arcs, circles and helical motion, tested with several CAM tools.
  • Includes acceleration management with look-ahead for smooth motion and cornering.
  • Open plugin architecture allows adding M-codes, settings and event handling without changing core source.
  • Supports a broad set of G- and M-codes, some dependent on driver or configuration, plus lathe and tool-change modes.

Written by Robotheca from the project's README (opens in a new tab) at commit 4ec1ae4.

Getting started

Difficulty
Intermediate
Hardware it needs, as the project states it
32-bit microcontroller with ample RAM and flash (compared to AVR 328p), requiring a hardware driver for the target processor.

Maintenance

Status
Active: a commit in the last 90 days
Newest commit
15 Oct 2026 on master
Latest release
Build 20250518 (22 May 2025)

Checked on GitHub on 16 Oct 2026.

Links

Robots on Robotheca that use it

No robot on Robotheca is linked to it yet. Links come from a robot's robot.yaml, from its dependency files read as text, or from Robotheca's editors.

Robotheca lists software as a reference: nothing is hosted or run here, and every fact links to where it was read.