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Reword the `config.h` section 

This section didn't include the possibility of a user `config.h`, and it
wasn't clear exactly how the settings override works.
This commit is contained in:
Evan Travers 2018-07-14 15:33:50 -05:00 committed by Jack Humbert
parent b4f4576631
commit b666921e25
1 changed files with 16 additions and 5 deletions
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21
docs/getting_started_introduction.md
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@ -25,23 +25,34 @@ In every keymap folder, the following files may be found. Only `keymap.c` is req
# The `config.h` File
There are 2 `config.h` locations:
There are 3 possible `config.h` locations:
* keyboard (`/keyboards/<keyboard>/config.h`)
* userspace (`/users/<user>/config.h`)
* keymap (`/keyboards/<keyboard>/keymaps/<keymap>/config.h`)
If the keymap `config.h` exists, that file is included by the build system and the keyboard `config.h` is not included. If you wish to override settings in your keymap's `config.h` you will need to include some glue code:
The build system automatically picks up the config files in the above order. If you wish to override any setting set by a previous `config.h` you will need to first include some boilerplate code around the settings you wish to change.
```
#ifndef CONFIG_USER_H
#define CONFIG_USER_H
#include "config_common.h"
// overrides go here!
#endif
```
If you want to override a setting from the parent `config.h` file, you need to `#undef` and then `#define` the setting again, like this:
Then to override a setting from the previous `config.h` file you must `#undef` and then `#define` the setting again.
```c
The boilerplate code and setting look like this together:
```
#ifndef CONFIG_USER_H
#define CONFIG_USER_H
// overrides go here!
#undef MY_SETTING
#define MY_SETTING 4
#endif
```