Marlin Custom Variants

This buildroot/share/PlatformIO/variants folder contains Marlin custom variants for both generic and custom boards.

Marlin specifies board variants in PlatformIO INI files in one of two ways:

• The board_build.variant = VARIANT_NAME field specifies the variant subfolder name directly.
• The board = board_name field names a custom board JSON file that contains a build.variant field.

Variant File Naming

With the latest STM32 platform (17.x) the variant.h and variant.cpp files are required to have more unique names. If the variant is based on a generic board definition the name variant_generic.h/.cpp should be used. Otherwise, the capitalized name of the board should be used.

Examples

board	board file	variant	Variant Files
marlin_STM32F407VGT6_CCM	marlin_STM32F407VGT6_CCM.json	MARLIN_BTT_E3_RRF	variants/MARLIN_BTT_E3_RRF/variant.*
genericSTM32F103VE	n/a	MARLIN_F103Vx	variants/MARLIN_F103Vx/variant_generic.*
marlin_STM32F407ZE	marlin_STM32F407ZE.json	MARLIN_F407ZE	variants/MARLIN_F407ZE/variant_MARLIN_F407ZE.*

Marlin Custom Boards

The buildroot/share/PlatformIO/boards folder contains Marlin's custom board definition JSON files. These files provide hardware IDs, board statistics, additional build flags, custom variant name, linker definition filename, remote debug options, upload devices, etc.