IDF Component Manager¶
The IDF Component manager is a tool that downloads dependencies for any ESP-IDF CMake project. The download happens automatically during a run of CMake. It can source components either from the component registry or from a git repository.
A list of components can be found on https://components.espressif.com/
Activating the Component Manager¶
If CMake is started using
idf.py or ESP-IDF VSCode Extension then the component manager will be activated by default.
If CMake is used directly or with some CMake-based IDE like CLion, it’s necessary to set the
IDF_COMPONENT_MANAGER environment variable to
1 to enable the component manager integration with the build system.
Using with a project¶
Dependencies for each component in the project are defined in a separate manifest file named
idf_component.yml placed in the root of the component. The manifest file template can be created for a component by running
idf.py create-manifest --component=my_component. When a new manifest is added to one of the components in the project it’s necessary to reconfigure it manually by running
idf.py reconfigure. Then build will track changes in
idf_component.yml manifests and automatically triggers CMake when necessary.
There is an example application: example:build_system/cmake/component_manager that uses components installed by the component manager.
It’s not necessary to have a manifest for components that don’t need any managed dependencies.
When CMake configures the project (e.g.
idf.py reconfigure) component manager does a few things:
idf_component.ymlmanifests for every component in the project and recursively solves dependencies
dependencies.lockfile in the root of the project with a full list of dependencies
Downloads all dependencies to the
dependencies.lock and content of
managed_components directory is not supposed to be modified by a user. When the component manager runs it always make sure they are up to date. If these files were accidentally modified it’s possible to re-run the component manager by triggering CMake with
Defining dependencies in the manifest¶
dependencies: # Required IDF version idf: ">=4.1" # Defining a dependency from the registry: # https://components.espressif.com/component/example/cmp example/cmp: ">=1.0.0" # # Other ways to define dependencies # # # For components maintained by Espressif only name can be used. # # Same as `espressif/cmp` # component: "~1.0.0" # # # Or in a longer form with extra parameters # component2: # version: ">=2.0.0" # # # For transient dependencies `public` flag can be set. # # `public` flag doesn't affect the `main` component. # # All dependencies of `main` are public by default. # public: true # # # For components hosted on non-default registry: # service_url: "https://componentregistry.company.com" # # # For components in git repository: # test_component: # path: test_component # git: ssh://firstname.lastname@example.org/user/components.git # # # For test projects during component development # # components can be used from a local directory # # with relative or absolute path # some_local_component: # path: ../../projects/component