Merge remote-tracking branch 'upstream/develop' into xap

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Nick Brassel
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# QMK Breaking Changes - 2025 February 23 Changelog
## Notable Features
### Community Modules ([#24848](https://github.com/qmk/qmk_firmware/pull/24848))
Community Modules are a feature within QMK which allows code to be implemented by third parties, making it available for other people to import into their own builds.
These modules can provide implementations which override or enhance normal QMK processing; initialization, key processing, suspend, and shutdown are some of the provided hooks which modules may currently implement.
See the [Community Modules documentation](../features/community_modules) for more information, including the full list of available hooks.
First-class support for [External Userspace](../newbs_external_userspace) is included out of the box, so there's even more reason to take the plunge and convert your keymap builds to a userspace repository!
::: tip
An example with a new keycode and some debugging information in the QMK repository [lives here](https://github.com/qmk/qmk_firmware/tree/master/modules/qmk/hello_world), and a community module port of [getreuer's SOCD Cleaner](https://getreuer.info/posts/keyboards/socd-cleaner/) can be found in [tzarc's modules repo](https://github.com/tzarc/qmk_modules).
:::
### Chordal Hold ([#24560](https://github.com/qmk/qmk_firmware/pull/24560))
Chordal Hold implements, by default, an "opposite hands" rule. Suppose a tap-hold key is pressed and then, before the tapping term, another key is pressed. With Chordal Hold, the tap-hold key is settled as tapped if the two keys are on the same hand.
Chordal Hold may be useful to avoid accidental modifier activation with mod-taps, particularly in rolled keypresses when using home row mods.
See the [Chordal Hold documentation](../tap_hold#chordal-hold) for more information.
## Changes Requiring User Action
### Updated Keyboard Codebases
| Old Keyboard Name | New Keyboard Name |
|-------------------------|-----------------------------|
| cxt_studio | cxt_studio/12e4 |
| ergodox_stm32 | handwired/ergodox_stm32 |
| ploopyco/mouse | ploopyco/mouse/rev1_002 |
| ploopyco/trackball/rev1 | ploopyco/trackball/rev1_004 |
| ymdk/id75 | ymdk/id75/f103 |
## Deprecation Notices
In line with the [notice period](../support_deprecation_policy#how-much-advance-notice-will-be-given), deprecation notices for larger items are listed here.
### DEFAULT_FOLDER removal ([#24836](https://github.com/qmk/qmk_firmware/pull/24836))
`DEFAULT_FOLDER` was originally introduced to work around limitations within the build system.
Parent folders containing common configuration would create invalid build targets.
With the introduction of [`keyboard.json`](./20240526#keyboard-json) as a configuration file, the build system now has a consistent method to detect build targets.
The `DEFAULT_FOLDER` functionality is now redundant and the intent is for `rules.mk` to become pure configuration.
Backwards compatibility of build targets has been maintained where possible.
## Full changelist
Core:
* Chaining OSL and MO ([#23065](https://github.com/qmk/qmk_firmware/pull/23065))
* Add extra keymap for EurKEY layout ([#24241](https://github.com/qmk/qmk_firmware/pull/24241))
* Add leader_add_user callback ([#24266](https://github.com/qmk/qmk_firmware/pull/24266))
* always return audio pin to 0 on ARM ([#24503](https://github.com/qmk/qmk_firmware/pull/24503))
* Update Starlight matrix effects ([#24521](https://github.com/qmk/qmk_firmware/pull/24521))
* Refactor Hue Breathing matrix effect with runner ([#24525](https://github.com/qmk/qmk_firmware/pull/24525))
* Ensure timer_read() is safe to call from interrupt handlers on ARM ([#24529](https://github.com/qmk/qmk_firmware/pull/24529))
* Update Raindrops effect to respect LED range limits ([#24531](https://github.com/qmk/qmk_firmware/pull/24531))
* Add Chordal Hold, an "opposite hands rule" tap-hold option similar to Achordion, Bilateral Combinations. ([#24560](https://github.com/qmk/qmk_firmware/pull/24560))
* Azoteq - improve I2C behaviour while polling. ([#24611](https://github.com/qmk/qmk_firmware/pull/24611))
* macOS install: remove bad ARM toolchains ([#24637](https://github.com/qmk/qmk_firmware/pull/24637))
* small refactoring of TIMER_DIFF ([#24678](https://github.com/qmk/qmk_firmware/pull/24678))
* Subscript alef correction ([#24707](https://github.com/qmk/qmk_firmware/pull/24707))
* Created SH1107 driver for quantum painter ([#24724](https://github.com/qmk/qmk_firmware/pull/24724))
* [CI] Regenerate Files ([#24772](https://github.com/qmk/qmk_firmware/pull/24772))
* Patch up issue for inverted complementary output on Backlight ([#24794](https://github.com/qmk/qmk_firmware/pull/24794))
* Patch up issue when compile with APA102 driver ([#24800](https://github.com/qmk/qmk_firmware/pull/24800))
* Consolidate send_string implementations. ([#24817](https://github.com/qmk/qmk_firmware/pull/24817))
* Consolidate timer_elapsed implementations ([#24830](https://github.com/qmk/qmk_firmware/pull/24830))
* `i2c_master`: remove deprecated functions ([#24832](https://github.com/qmk/qmk_firmware/pull/24832))
* Resolve keyboard_aliases when processing keyboard make targets ([#24834](https://github.com/qmk/qmk_firmware/pull/24834))
* LED drivers: remove deprecated defines ([#24837](https://github.com/qmk/qmk_firmware/pull/24837))
* `ferris/0_1`: update I2C API usage ([#24839](https://github.com/qmk/qmk_firmware/pull/24839))
* Unify i2c_master headers ([#24846](https://github.com/qmk/qmk_firmware/pull/24846))
* Community modules ([#24848](https://github.com/qmk/qmk_firmware/pull/24848))
* Relocate base WS2812 code ([#24850](https://github.com/qmk/qmk_firmware/pull/24850))
* Unify UART headers ([#24855](https://github.com/qmk/qmk_firmware/pull/24855))
* Unify spi_master headers ([#24857](https://github.com/qmk/qmk_firmware/pull/24857))
* Invoke `process_record_via` after `_user`/`_kb` have a chance to handle it. ([#24879](https://github.com/qmk/qmk_firmware/pull/24879))
CLI:
* Extend lint to reject 'blank' files ([#23994](https://github.com/qmk/qmk_firmware/pull/23994))
* `qmk docs`: restore `--port` and `--browser` arguments ([#24623](https://github.com/qmk/qmk_firmware/pull/24623))
* Update via2json layout macro searching ([#24640](https://github.com/qmk/qmk_firmware/pull/24640))
* Change `new-keymap` keymap name prompt ([#24701](https://github.com/qmk/qmk_firmware/pull/24701))
* default_keyboard.h generation tweaks ([#24715](https://github.com/qmk/qmk_firmware/pull/24715))
* Ensure `qmk flash` rejects invalid files for uf2 compatible bootloaders ([#24802](https://github.com/qmk/qmk_firmware/pull/24802))
* Reject readme dummy content ([#24913](https://github.com/qmk/qmk_firmware/pull/24913))
Submodule updates:
* chibios: usb_main: remove OTG sof workaround ([#24259](https://github.com/qmk/qmk_firmware/pull/24259))
* Update ChibiOS to latest stable branch. ([#24651](https://github.com/qmk/qmk_firmware/pull/24651))
* Update ChibiOS `stable_21.11.x`. ([#24714](https://github.com/qmk/qmk_firmware/pull/24714))
* Update ChibiOS-Contrib. ([#24803](https://github.com/qmk/qmk_firmware/pull/24803))
Keyboards:
* refactor: move ymdk/id75 to revision ([#24590](https://github.com/qmk/qmk_firmware/pull/24590))
* skyloong/gk61: Remove overriding of core keycode behaviour ([#24655](https://github.com/qmk/qmk_firmware/pull/24655))
* moky/moky88: Remove use of deprecated defines ([#24656](https://github.com/qmk/qmk_firmware/pull/24656))
* Updating Promenade keyboard (Missing keys in matrix, other minor changes to keymap) ([#24705](https://github.com/qmk/qmk_firmware/pull/24705))
* Moving cxt_studio keyboard to own folder ([#24748](https://github.com/qmk/qmk_firmware/pull/24748))
* Add CXT Studio 12E3 keyboard ([#24749](https://github.com/qmk/qmk_firmware/pull/24749))
* Add Silakka54 keyboard ([#24757](https://github.com/qmk/qmk_firmware/pull/24757))
* Add more layout for skiller_sgk50_s4 ([#24784](https://github.com/qmk/qmk_firmware/pull/24784))
* Add watchdog service to RGBKB Sol 3 ([#24786](https://github.com/qmk/qmk_firmware/pull/24786))
* Migrate some DEFAULT_FOLDER to keyboard_aliases.hjson ([#24835](https://github.com/qmk/qmk_firmware/pull/24835))
* Remove DEFAULT_FOLDER where keyboard aliases already exists ([#24838](https://github.com/qmk/qmk_firmware/pull/24838))
* Migrate some DEFAULT_FOLDER to keyboard_aliases.hjson ([#24845](https://github.com/qmk/qmk_firmware/pull/24845))
* Update for 'A-JAZZ AKC084' ('A-JAZZ AKP846') ([#24868](https://github.com/qmk/qmk_firmware/pull/24868))
* handwired/xealous - Remove DEFAULT_FOLDER ([#24877](https://github.com/qmk/qmk_firmware/pull/24877))
* Updates to Ploopy Classic, Mouse, and Thumb for RP2040 hardware upgrade ([#24880](https://github.com/qmk/qmk_firmware/pull/24880))
* Move Ergodox STM32 to handwired folder ([#24903](https://github.com/qmk/qmk_firmware/pull/24903))
* Remove readme dummy content ([#24912](https://github.com/qmk/qmk_firmware/pull/24912))
* Migrate some DEFAULT_FOLDER to keyboard_aliases.hjson ([#24915](https://github.com/qmk/qmk_firmware/pull/24915))
* Migrate some DEFAULT_FOLDER to keyboard_aliases.hjson ([#24938](https://github.com/qmk/qmk_firmware/pull/24938))
Keyboard fixes:
* Fix up CI with `DEFAULT_FOLDER`. ([#24842](https://github.com/qmk/qmk_firmware/pull/24842))
* rgbkb/pan - Remove invalid build target ([#24844](https://github.com/qmk/qmk_firmware/pull/24844))
Others:
* Formally deprecate DEFAULT_FOLDER ([#24836](https://github.com/qmk/qmk_firmware/pull/24836))
* Correct I2C API reference ([#24840](https://github.com/qmk/qmk_firmware/pull/24840))
Bugs:
* Retro Tapping Re-Write; Key Roll Fix ([#23641](https://github.com/qmk/qmk_firmware/pull/23641))
* Fix Quantum Painter compiliation issues with heavy optimization ([#24667](https://github.com/qmk/qmk_firmware/pull/24667))
* Bugfix and update for AT32F415 ([#24807](https://github.com/qmk/qmk_firmware/pull/24807))
* Fix for Chordal Hold: stuck mods when mod-taps are pressed in a stuttered sequence. ([#24878](https://github.com/qmk/qmk_firmware/pull/24878))
* fix EEPROM driver for STM32L0/1 cat.1 devices ([#24928](https://github.com/qmk/qmk_firmware/pull/24928))
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"items": [
{ "text": "Customizing Functionality", "link": "/custom_quantum_functions" },
{ "text": "Driver Installation with Zadig", "link": "/driver_installation_zadig" },
{ "text": "Community Modules", "link": "/features/community_modules" },
{ "text": "Keymap Overview", "link": "/keymap" },
{
"text": "Development Environments",
@@ -207,7 +208,7 @@
{ "text": "My Pull Request Was Flagged", "link": "/breaking_changes_instructions" },
{
"text": "Most Recent ChangeLog",
"link": "/ChangeLog/20241124"
"link": "/ChangeLog/20250223"
},
{ "text": "Past Breaking Changes", "link": "/breaking_changes_history" },
{ "text": "Deprecation Policy", "link": "/support_deprecation_policy" }
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## What has been included in past Breaking Changes?
* [2025 Feb 23](ChangeLog/20250223)
* [2024 Nov 24](ChangeLog/20241124)
* [2024 Aug 25](ChangeLog/20240825)
* [2024 May 26](ChangeLog/20240526)
* [Older Breaking Changes](breaking_changes_history)
## When is the next Breaking Change?
The next Breaking Change is scheduled for February 23, 2025.
The next Breaking Change is scheduled for May 25, 2025.
### Important Dates
* 2024 Nov 24 - `develop` is tagged with a new release version. Each push to `master` is subsequently merged to `develop` by GitHub actions.
* 2025 Jan 26 - `develop` closed to new PRs.
* 2025 Jan 26 - Call for testers.
* 2025 Feb 9 - Last day for merges -- after this point `develop` is locked for testing and accepts only bugfixes
* 2025 Feb 16 - `develop` is locked, only critical bugfix PRs merged.
* 2024 Nov 21 - `master` is locked, no PRs merged.
* 2025 Feb 23 - Merge `develop` to `master`.
* 2025 Feb 23 - `master` is unlocked. PRs can be merged again.
* 2025 Feb 23 - `develop` is tagged with a new release version. Each push to `master` is subsequently merged to `develop` by GitHub actions.
* 2025 Apr 27 - `develop` closed to new PRs.
* 2025 Apr 27 - Call for testers.
* 2025 May 11 - Last day for merges -- after this point `develop` is locked for testing and accepts only bugfixes
* 2025 May 18 - `develop` is locked, only critical bugfix PRs merged.
* 2025 May 23 - `master` is locked, no PRs merged.
* 2025 May 25 - Merge `develop` to `master`.
* 2025 May 25 - `master` is unlocked. PRs can be merged again.
## What changes will be included?
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This page links to all previous changelogs from the QMK Breaking Changes process.
* [2025 Feb 23](ChangeLog/20250223) - version 0.28.0
* [2024 Nov 24](ChangeLog/20241124) - version 0.27.0
* [2024 Aug 25](ChangeLog/20240825) - version 0.26.0
* [2024 May 26](ChangeLog/20240526) - version 0.25.0
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We have structured QMK as a hierarchy:
* Core (`_quantum`)
* Community Module (`_<module>`)
* Community Module -> Keyboard/Revision (`_<module>_kb`)
* Community Module -> Keymap (`_<module>_user`)
* Keyboard/Revision (`_kb`)
* Keymap (`_user`)
Each of the functions described below can be defined with a `_kb()` suffix or a `_user()` suffix. We intend for you to use the `_kb()` suffix at the Keyboard/Revision level, while the `_user()` suffix should be used at the Keymap level.
When defining functions at the Keyboard/Revision level it is important that your `_kb()` implementation call `_user()` before executing anything else- otherwise the keymap level function will never be called.
When defining functions at the Keyboard/Revision level it is important that your `_kb()` implementation call `_user()` at an appropriate location, otherwise the keymap level function will never be called.
Functions at the `_<module>_xxx()` level are intended to allow keyboards or keymaps to override or enhance the processing associated with a [community module](/features/community_modules).
When defining module overrides such as `process_record_<module>()`, the same pattern should be used; the module must invoke `process_record_<module>_kb()` as appropriate.
# Custom Keycodes
@@ -99,7 +106,7 @@ These are the three main initialization functions, listed in the order that they
* `keyboard_post_init_*` - Happens at the end of the firmware's startup process. This is where you'd want to put "customization" code, for the most part.
::: warning
For most people, the `keyboard_post_init_user` function is what you want to call. For instance, this is where you want to set up things for RGB Underglow.
For most people, the `keyboard_post_init_user` function is what you want to implement. For instance, this is where you want to set up things for RGB Underglow.
:::
## Keyboard Pre Initialization code
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# Community Modules
Community Modules are a feature within QMK which allows code to be implemented by third parties, making it available for other people to import into their own builds.
These modules can provide implementations which override or enhance normal QMK processing; initialization, key processing, suspend, and shutdown are some of the provided hooks which modules may implement.
## Adding a Community Module to your build
Community Modules have first-class support for [External Userspace](/newbs_external_userspace), and QMK strongly recommends using External Userspace for hosting keymaps and Community Modules together.
Modules must live in either of two locations:
* `<QMK_USERSPACE>/modules/`
* `<QMK_FIRMWARE>/modules/`
A basic module is provided within QMK itself -- `qmk/hello_world` -- which prints out a notification over [HID console](/faq_debug) after 10 seconds, and adds a new keycode, `COMMUNITY_MODULE_HELLO` (aliased to `CM_HELO`) which types `Hello there.` to the active application when the corresponding key is pressed.
To add this module to your build, in your keymap's directory create a `keymap.json` with the following content:
```json
{
"modules": [
"qmk/hello_world"
]
}
```
If you already have a `keymap.json`, you'll need to manually merge the `modules` section into your keymap.
::: warning
Community Modules are not supported by QMK Configurator. If you wish to use Community Modules, you must build your own firmware.
:::
## Adding a Community Module to your External Userspace
Module authors are encouraged to provide a git repository on GitHub which may be imported into a user's external userspace. If a user wishes to import a module repository, they can do the following:
```sh
cd /path/to/your/external/userspace
mkdir -p modules
# Replace the following {user} and {repo} with the author's community module repository
git submodule add https://github.com/{user}/{repo}.git modules/{user}
git submdule update --init --recursive
```
This will ensure the copy of the module is made in your userspace.
Add a new entry into your `keymap.json` with the desired modules, replacing `{user}` and `{module_name}` as appropriate:
```json
{
"modules": [
"qmk/hello_world",
"{user}/{module_name}"
]
}
```
::: info
The module listed in `keymap.json` is the relative path within the `modules/` directory. So long as the module is present _somewhere_ under `modules/`, then the `keymap.json` can refer to that path.
:::
## Writing a QMK Community Module
As stated earlier, Community Module authors are strongly encouraged to provide their modules through git, allowing users to leverage submodules to import functionality.
### `qmk_module.json`
A Community Module is denoted by a `qmk_module.json` file such as the following:
```json
{
"module_name": "Hello World",
"maintainer": "QMK Maintainers",
"features": {
"deferred_exec": true
},
"keycodes": [
{
"key": "COMMUNITY_MODULE_HELLO",
"aliases": ["CM_HELO"]
}
]
}
```
At minimum, the module must provide the `module_name` and `maintainer` fields.
The use of `features` matches the definition normally provided within `keyboard.json` and `info.json`, allowing a module to signal to the build system that it has its own dependencies. In the example above, it enables the _deferred executor_ feature whenever the above module is used in a build.
The `keycodes` array allows a module to provide new keycodes (as well as corresponding aliases) to a keymap.
### `rules.mk` / `post_rules.mk`
These two files follows standard QMK build system logic, allowing for `Makefile`-style customisation as if it were present in the keyboard or keymap.
### `<module>.c`
This file will be automatically added to the build if the filename matches the directory name. For example, the `qmk/hello_world` module contains a `hello_world.c` file, which is automatically added to the build.
::: info
Other files intended to be included must use the normal method of `SRC += my_file.c` inside `rules.mk`.
:::
::: tip
This file should use `ASSERT_COMMUNITY_MODULES_MIN_API_VERSION(1,0,0);` to enforce a minimum version of the API that it requires, ensuring the Community Module is built with a compatible version of QMK. The list of APIs and corresponding version is given at the bottom of this document. Note the use of commas instead of periods.
:::
### `introspection.c` / `introspection.h`
These two files hook into the keymap introspection logic -- the header is prepended before the user keymap, and the C source file is appended after the user keymap.
The header may provide definitions which are useful to the user's `keymap.c`.
The source file may provide functions which allow access to information specified in the user's `keymap.c`.
::: warning
Introspection is a relatively advanced topic within QMK, and existing patterns should be followed. If you need help please [open an issue](https://github.com/qmk/qmk_firmware/issues/new) or [chat with us on Discord](https://discord.gg/qmk).
:::
### Compatible APIs
Community Modules may provide specializations for the following APIs:
| Base API | API Format | Example (`hello_world` module) | API Version |
|----------------------------|-------------------------------------|----------------------------------------|-------------|
| `keyboard_pre_init` | `keyboard_pre_init_<module>` | `keyboard_pre_init_hello_world` | `0.1.0` |
| `keyboard_post_init` | `keyboard_post_init_<module>` | `keyboard_post_init_hello_world` | `0.1.0` |
| `pre_process_record` | `pre_process_record_<module>` | `pre_process_record_hello_world` | `0.1.0` |
| `process_record` | `process_record_<module>` | `process_record_hello_world` | `0.1.0` |
| `post_process_record` | `post_process_record_<module>` | `post_process_record_hello_world` | `0.1.0` |
| `housekeeping_task` | `housekeeping_task_<module>` | `housekeeping_task_hello_world` | `1.0.0` |
| `suspend_power_down` | `suspend_power_down_<module>` | `suspend_power_down_hello_world` | `1.0.0` |
| `suspend_wakeup_init` | `suspend_wakeup_init_<module>` | `suspend_wakeup_init_hello_world` | `1.0.0` |
| `shutdown` | `shutdown_<module>` | `shutdown_hello_world` | `1.0.0` |
| `process_detected_host_os` | `process_detected_host_os_<module>` | `process_detected_host_os_hello_world` | `1.0.0` |
::: info
An unspecified API is disregarded if a Community Module does not provide a specialization for it.
:::
Each API has an equivalent `_<module>_kb()` and `_<module>_user()` hook, as per the normal QMK [`_quantum`, `_kb`, and `_user` functions](/custom_quantum_functions#a-word-on-core-vs-keyboards-vs-keymap).