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grbl_stm32f4

Purpose

This a port of the grbl 0.8c g-code interpreter to the STM32F4 SoC

The STM32F4 SoC has attractive features for a realtime G-Code interpreter and machine controller.

  • Lot's of IO - it's possible to run more stepper motors, more limit switches, etc.
  • A Floating Point Unit - good for doing the linear/circular interpolation math.
  • Fast (168MHz 32-bit versus 16MHz 8-bit for the atmega328p).

Target Platform

STM32F4Discovery Board

Build tools:

GCC Toolchain

STLink Programming Tool

Target CNC Machine

This code is a straight port of grbl and is adaptable to many stepper drivers and CNC machines.

My test and development has used:

Gecko Drives G540 4-Axis Digital Step Drive

KRMx01 CNC Router

Additions

  • Support for XYZY axes operation has been added. ie- Two stepper motors, controlled in the same way, are used to drive the Y-axis.
  • All input signals (homing switches, e-stop, etc.) are debounced in software.

Status

  • Non-volatile EEPROM storage of configuration parameters is not currently supported. The EEPROM facility is being faked with RAM based storage. The desired machine parameters should be compiled into the firmware.
  • The CDC USB serial device implemented on the board is not as reliable as it needs to be. Pending bug fixes the option of a normal serial port using the USART hardware has been implemented. This can be enabled in the makefile by setting "USB_SERIAL = 0".

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The grbl g-code interpreter ported to the STM32F4

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