grbl/grbl
Grbl
Grbl is a CNC motion control firmware and G-code parser designed for milling machines. It serves as a hardware control layer running on ATmega328 microcontrollers to translate G-code instructions into precise motor movements.
The system manages stepper motor acceleration and coordinated multi-axis motion to drive milling hardware. It includes a tool probing system for automating workpiece alignment and calculating tool length offsets, as well as homing cycles that use limit switches to establish a precise coordinate origin.
The firmware covers broader machine management including spindle and coolant speed modulation, software limit enforcement to prevent physical crashes, and input pin mapping for hardware functions. It also provides real-time status reporting and position updates to external controlling software.
Features
- Embedded G-Code Firmware - Implements embedded real-time control firmware that parses G-code commands to drive CNC milling hardware.
- CNC Machine Controllers - Provides a high-performance software platform for managing mechanical movement in subtractive manufacturing.
- Homing Cycles - Implements automated sequences to align machine axes by referencing limit switches to establish a coordinate origin.
- Stepper Motor Controllers - Controls velocity and acceleration for each axis to ensure smooth motion and reduce mechanical vibration.
- Motion Coordination Controllers - Translates movement instructions into precisely timed electrical pulses for multi-axis milling hardware.
- Hardware Register Timing - Provides low-level manipulation of microcontroller hardware registers for precise signal timing and pin control.
- Motion Planning Interrupts - Uses high-frequency timer interrupts to generate precise pulse trains for stepper motor control.
- G-Code Interpreters - Implements a state machine to parse and execute G-code manufacturing instructions for hardware control.
- Coordinate System Mappings - Implements a virtual offset layer to translate G-code coordinates into physical motor step counts.
- Soft Limit Enforcers - Enforces software-defined boundary limits to prevent the machine from moving beyond safe zones.
- Tool Length Offset Compensations - Grbl calculates and applies dynamic offsets to compensate for different tool lengths during machine operation.
- Tool Probing Calibrations - Uses electronic probes to determine the exact position of a tool relative to the workpiece for automated alignment.
- Lookup Table Acceleration - Calculates velocity changes using pre-computed arrays to reduce floating point math overhead.
- Motion Planning Buffers - Stores a sequence of upcoming moves in a circular buffer to prevent pauses between motion blocks.
- Machine Status Reporters - Streams real-time internal machine state and positional data to external controlling software.
- System Status Feedback - Provides real-time status updates and command execution feedback to the controlling software.
- G-code Software - High-performance G-code interpreting firmware for microcontrollers.
- Printer Firmware - Optimized CNC milling controller for Arduino hardware.
