Marlin is a huge C++ program composed of many files, but among t
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Configuring Marlin
Marlin is a huge C++ program composed of many files, but among the most important are
the files that contain all of Marlin’s compile-time configuration options:
• Configuration.h contains the core settings for the hardware, language and
controller selection, and settings for the most common features and components.
• Configuration_adv.h contains more detailed customization options, add-ons,
experimental features, and other esoteric settings.
• config.ini may be included to modify the configuration at the start of a PlatformIO
build. See the Configuration with INI page for more information.
The two files contain all of Marlin’s build-time configuration options. Simply edit or replace
these files, then build and upload Marlin to the board. Hundreds of user-donated
configurations are posted at the Configurations repository to get you started. .h
Compiler Directives
Marlin is configured using C++ compiler directives. This allows Marlin to leverage the C++
preprocessor and include only the code and data needed for the enabled options. This
results in the smallest possible binary. A build of Marlin can range from 50K to over 230K in
size.
Settings can be enabled, disabled, and assigned values using C preprocessor syntax like
so:
Plaintext
#define THIS_IS_ENABLED // this switch is enabled
//#define THIS_IS_DISABLED // this switch is disabled
#define OPTION_VALUE 22 // this setting is "22"
Migration
To use configurations from an earlier version of Marlin, first try dropping them into the newer
Marlin, updating and , and building the firmware. As part of the build process, Marlin will
check for outdated options and show error messages that explain exactly what needs to be
changed. CONFIGURATION_H_VERSION CONFIGURATION_ADV_H_VERSION
To migrate your settings to a new Configuration you can use tools like Notepad++ or
Winmerge to compare old configurations with the newer (default) configurations and copy
settings over on a change-by-change basis. Most settings will come over without changes,
then you can review any tricky changes that remain.
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