[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
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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.
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The `config.h` files can also be placed in sub-folders, and the order in which they are read is as follows:
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* `keyboards/top_folder/config.h`
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  * `keyboards/top_folder/sub_1/config.h`
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    * `keyboards/top_folder/sub_1/sub_2/config.h`
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      * `keyboards/top_folder/sub_1/sub_2/sub_3/config.h`
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        * `keyboards/top_folder/sub_1/sub_2/sub_3/sub_4/config.h`
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          * `users/a_user_folder/config.h`
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          * `keyboards/top_folder/keymaps/a_keymap/config.h`
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        * `keyboards/top_folder/sub_1/sub_2/sub_3/sub_4/post_config.h`
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      * `keyboards/top_folder/sub_1/sub_2/sub_3/post_config.h`
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    * `keyboards/top_folder/sub_1/sub_2/post_config.h`
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  * `keyboards/top_folder/sub_1/post_config.h`
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* `keyboards/top_folder/post_config.h`
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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:
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* `keyboards/top_folder/keymaps/a_keymap/config.h`
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  ```c
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  #define IOS_DEVICE_ENABLE
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  ```
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* `keyboards/top_folder/post_config.h`
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  ```c
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  #ifndef IOS_DEVICE_ENABLE
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    // USB_MAX_POWER_CONSUMPTION value for this keyboard
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    #define USB_MAX_POWER_CONSUMPTION 400
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  #else
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    // fix iPhone and iPad power adapter issue
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    // iOS device need lessthan 100
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    #define USB_MAX_POWER_CONSUMPTION 100
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  #endif
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  #ifdef RGBLIGHT_ENABLE
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    #ifndef IOS_DEVICE_ENABLE
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      #define RGBLIGHT_LIMIT_VAL 200
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      #define RGBLIGHT_VAL_STEP 17
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    #else
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      #define RGBLIGHT_LIMIT_VAL 35
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      #define RGBLIGHT_VAL_STEP 4
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    #endif
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    #ifndef RGBLIGHT_HUE_STEP
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      #define RGBLIGHT_HUE_STEP 10
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    #endif
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    #ifndef RGBLIGHT_SAT_STEP
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      #define RGBLIGHT_SAT_STEP 17
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    #endif
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  #endif
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  ```
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?> 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`.
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### `rules.mk`
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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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