[Docs] added the description of the reading order of the config.h files. (#8545)
* added the description of the reading order of the config.h files. * Update docs/hardware_keyboard_guidelines.md * Update docs/hardware_keyboard_guidelines.md * Added a description of post_config.h. * sample bug fix * sample update * Update docs/hardware_keyboard_guidelines.md * Update docs/hardware_keyboard_guidelines.md * update docs/hardware_keyboard_guidelines.md * Update docs/hardware_keyboard_guidelines.md
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		| @@ -61,6 +61,57 @@ This file is used by the [QMK API](https://github.com/qmk/qmk_api). It contains | ||||
|  | ||||
| All projects need to have a `config.h` file that sets things like the matrix size, product name, USB VID/PID, description and other settings. In general, use this file to set essential information and defaults for your keyboard that will always work. | ||||
|  | ||||
| The `config.h` files can also be placed in sub-folders, and the order in which they are read is as follows: | ||||
|  | ||||
| * `keyboards/top_folder/config.h` | ||||
|   * `keyboards/top_folder/sub_1/config.h` | ||||
|     * `keyboards/top_folder/sub_1/sub_2/config.h` | ||||
|       * `keyboards/top_folder/sub_1/sub_2/sub_3/config.h` | ||||
|         * `keyboards/top_folder/sub_1/sub_2/sub_3/sub_4/config.h` | ||||
|           * `users/a_user_folder/config.h` | ||||
|           * `keyboards/top_folder/keymaps/a_keymap/config.h` | ||||
|         * `keyboards/top_folder/sub_1/sub_2/sub_3/sub_4/post_config.h` | ||||
|       * `keyboards/top_folder/sub_1/sub_2/sub_3/post_config.h` | ||||
|     * `keyboards/top_folder/sub_1/sub_2/post_config.h` | ||||
|   * `keyboards/top_folder/sub_1/post_config.h` | ||||
| * `keyboards/top_folder/post_config.h` | ||||
|  | ||||
| The `post_config.h` file can be used for additional post-processing, depending on what is specified in the `config.h` file. For example, if you define the `IOS_DEVICE_ENABLE` macro in your keymap-level `config.h` file as follows, you can configure more detailed settings accordingly in the `post_config.h` file: | ||||
|  | ||||
| * `keyboards/top_folder/keymaps/a_keymap/config.h` | ||||
|   ```c | ||||
|   #define IOS_DEVICE_ENABLE | ||||
|   ``` | ||||
| * `keyboards/top_folder/post_config.h` | ||||
|   ```c | ||||
|   #ifndef IOS_DEVICE_ENABLE | ||||
|     // USB_MAX_POWER_CONSUMPTION value for this keyboard | ||||
|     #define USB_MAX_POWER_CONSUMPTION 400 | ||||
|   #else | ||||
|     // fix iPhone and iPad power adapter issue | ||||
|     // iOS device need lessthan 100 | ||||
|     #define USB_MAX_POWER_CONSUMPTION 100 | ||||
|   #endif | ||||
|    | ||||
|   #ifdef RGBLIGHT_ENABLE | ||||
|     #ifndef IOS_DEVICE_ENABLE | ||||
|       #define RGBLIGHT_LIMIT_VAL 200 | ||||
|       #define RGBLIGHT_VAL_STEP 17 | ||||
|     #else | ||||
|       #define RGBLIGHT_LIMIT_VAL 35 | ||||
|       #define RGBLIGHT_VAL_STEP 4 | ||||
|     #endif | ||||
|     #ifndef RGBLIGHT_HUE_STEP | ||||
|       #define RGBLIGHT_HUE_STEP 10 | ||||
|     #endif | ||||
|     #ifndef RGBLIGHT_SAT_STEP | ||||
|       #define RGBLIGHT_SAT_STEP 17 | ||||
|     #endif | ||||
|   #endif | ||||
|   ``` | ||||
|  | ||||
| ?> If you define options using `post_config.h` as in the above example, you should not define the same options in the keyboard- or user-level `config.h`. | ||||
|  | ||||
| ### `rules.mk` | ||||
|  | ||||
| The presence of this file means that the folder is a keyboard target and can be used in `make` commands. This is where you setup the build environment for your keyboard and configure the default set of features. | ||||
|   | ||||
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