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STM32F4xx grblHAL driver

A grblHAL driver for the STM32F401xC, STM32F407xx, STM32F411xE and STM32F446xx ARM processors.

Loosely based on code from robomechs 6-AXIS-USBCNC-GRBL port, updated for STM32CubeIDE and the latest STM HAL drivers where appropriate.

Quickstart

This driver can be built with the Web Builder. Alternatively it can be built with the STM32CubeIDE or PlatformIO.
For additional information on howto import the project, configure the driver and compile the firmware, see the Wiki-page compiling grblHAL.

Install PlatformIO Core and then:

# Clone this repository
git clone https://github.com/grblHAL/STM32F4xx.git
cd STM32F4

# List available environments:
pio run --list-targets

# Pick an environment name (left column) matching your board variant and kick off the build with:
pio run --environment nucleo_f411re_protoneer

# To build firmware for all supported board variants, simply skip the `--environment` option:
pio run

# For e.g. Nucleo boards you can upload the firmware (via USB) using the built-in ST-Link programmer:
pio run -e nucleo_f411re_protoneer --target upload

# For help with PlatformIO, try using `-h`:
pio run -h
pio -h

The built firmware is stored inside directories named .pio/build/<env name>/, as firmware.elf (executable) or firmware.bin (binary image).

If the board exposes a USB mass storage device or has a microSD card, simply copy the firmware.bin to the root of this filesystem and reset the board.

If you want to customize the build, take a look at platformio.ini where you can uncomment/customize additional build_flags and lib_deps in the [common] or [env:some_board_variant] sections.

Also see Inc/my_machine.h but beware that settings in this file are ignored by PlatformIO (via the -D OVERRIDE_MY_MACHINE= build flag). If they're not already present in the platformio.ini file, you will need to add them to the build_flags option in the appropriate section.

NOTE: As of Sep, 2021, the PlatformIO environments for the BigTreeTech SKR boards remain untested and might not work. Feel free to drop a note of your success or failure with these boards on https://github.com/grblHAL/STM32F4xx/issues.

Changelog

2021-19-09: Added build option to build a BTT SKR 2 bootloader compatible binary.

This can be built by selecting Release F407 8MHz 32K Bootloader from the build tool dropdown.

NOTE: A build configuration for a debug version has not been added as a programmer/debugger is required and flashing a "normal" debug build is usually appropriate when debugging. This overwrites the bootloader that later has to be restored if a bootloader version is to be flashed again. Alternatively a build configuration has to be added or modified to set the vector table offset by adding the symbol VECT_TAB_OFFSET with value 0x8008000 and configuring it to use the correct loader script.

Bootloader binaries for the SKR2 board can be found here. Be aware that the Bootloader_and_Firmware folder contains Marlin firmware, not grblHAL.

2021-08-10: Added support for BTT SKR 2, this is based on a STM32F407 processor with a 8MHz crystal.

2021-05-28: Added support for BTT SKR PRO, this is based on a STM32F407 processor with a 25MHz crystal.

Building grblHAL with Eclipse

Available driver options can be found here.

Select the processor to build for from the build tool dropdown to build. The .bin created file can be found in the folder with the same name as the menu name when the build is completed.
Config

Build configuration Targets Linker script
Release F401 Blackpill F401 Blackpill STM32F401CCUX_FLASH.ld
Release F407 25MHz BT SKR PRO STM32F407VGTX_FLASH.ld
Release F407 8MHz BTT SKR 2.0, STM32F407 Discovery STM32F407VGTX_FLASH.ld
Release F407 8MHz 32K Bootloader BTT SKR 2.0 STM32F407VGTX_BL32K_FLASH.ld
Release F411 Blackpill F411 Blackpill STM32F411CEUX_FLASH.ld
Release F411 Nucleo64 NUCLEO-F446RE STM32F411CEUX_FLASH.ld
Release F446 8 MHz Generic STM32F446RETX_FLASH.ld
Release F446 Nucleo64 NUCLEO-F446RE STM32F446RETX_FLASH.ld

If the oscillator frequency is different from the default 25 MHz then add the symbol HSE_VALUE and set the value to the frequency in Hz. E.g. 8000000 for 8 Mhz.

A method for flashing the Nucleo F411 and Nucleo F446 is to drop the .bin file on the NODE_F4xxRE flash drive. Note that the file can be dragged from the IDE Project Explorer.

NOTE: Internal flash page for parameters is not at the end of the flash memory due to size restrictions. This means each firmware upgrade will erase any saved parameters.


If compiling for debugging, edit symbols in project properties C/C++ General > Paths and Symbols > Symbols to match your processor/board.

Remove symbols starting with STM32F4, starting with NUCLEO_F4 and HSE_VALUE. Then add symbols:

STM32F401

  • Add STM32F401xC.

STM32F407

  • Add STM32F407xx.

STM32F411

STM32F446

See also

CNC breakout boards:

Minimal breakout for Blackpill by avizienis.

CNC breakout for Nucleo-64 by Terje Io.


2023-09-20

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