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If you want to use TMK for your own keyboard project, you've got three options for embedding the core.
The recommended option is subtrees.
After adding the embed you'll need to modify the Makefile of your project to point to the core correctly.
1. git subtree
In order to set up the subtree in your project, first add the core repository as a remote:
git remote add -f core https://github.com/tmk/tmk_core
Then add the core as a subtree (directory) in your local repository:
git subtree add -P tmk_core core master --squash
And that's it!
When you want to update the subtree in your repository to match the master on tmk_core, do this:
git subtree pull -P tmk_core core master --squash
2. git submodule
In order to set up the submodule in your project, first add a new submodule:
git submodule add https://github.com/tmk/tmk_core tmk_core
Then pull, sync and update the submodule:
git pull
git submodule sync --recursive
git submodule update --init --recursive
And that's it!
When you want to update the subtree in your repository to match the master on tmk_core, follow the same steps as above.
If you want to clone a repository from GitHub that has submodule(s) in it, pass --recursive when cloning, like so:
git clone --recursive https://github.com/<username>/<repository>
3. Manually (without git)
Note: This is not recommended in any way, but it's still possible.
Download a zipped version of the tmk_core repository using this link:
https://github.com/tmk/tmk_core/archive/master.zip
Extract the zip in your project's directory, then rename the folder to tmk_core.
Modifications to the Makefile
The one thing you have to make sure to change in the Makefile (compared to tmk_keyboard drivers' Makefile) is the "TMK_DIR" variable, which needs to point to the embed directory:
TMK_DIR = ./tmk_core