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# QMK Breaking Change - 2020 Nov 28 Changelog
Four times a year QMK runs a process for merging Breaking Changes. A Breaking Change is any change which modifies how QMK behaves in a way that is incompatible or potentially dangerous. We limit these changes to 4 times per year so that users can have confidence that updating their QMK tree will not break their keymaps.
## Changes Requiring User Action :id=changes-requiring-user-action
### Relocated Keyboards :id-relocated-keyboards
#### Reduce Helix keyboard build variation ([#8669](https://github.com/qmk/qmk_firmware/pull/8669))
The build commands for the Helix keyboard are:
```
make <helix_build_name>:<keymap_name>
```
For `<helix_build_name>`, specify the one in the rightmost column of the table below, such as `helix`,` helix/pico`.
| before Oct 17 2019 | Oct 17 2019 | Mar 10 2020 | Nov 28 2020 |
| ---------------------|-------------------------|-------------------------| ------------------------|
| helix/rev1 | helix/rev1 | helix/rev1 | helix/rev1 |
| helix/pico | helix/pico | helix/pico | helix/pico |
| | helix/pico/back | helix/pico/back | helix/pico/back |
| | helix/pico/under | helix/pico/under | helix/pico/under |
| | | helix/pico/sc | -- |
| | | helix/pico/sc/back | helix/pico/sc |
| | | helix/pico/sc/under | -- |
| helix/rev2 (=helix) | helix/rev2 (=helix) | helix/rev2 (=helix) | -- |
| | helix/rev2/back | helix/rev2/back | -- |
| | helix/rev2/back/oled | helix/rev2/back/oled | ( --> helix/rev2/back) |
| | helix/rev2/oled | helix/rev2/oled | helix/rev2 (=helix) |
| | helix/rev2/oled/back | helix/rev2/oled/back | helix/rev2/back |
| | helix/rev2/oled/under | helix/rev2/oled/under | helix/rev2/under |
| | | helix/rev2/sc | -- |
| | | helix/rev2/sc/back | -- |
| | | helix/rev2/sc/oled | -- |
| | | helix/rev2/sc/oledback | helix/rev2/sc |
| | | helix/rev2/sc/oledunder | -- |
| | | helix/rev2/sc/under | -- |
| | helix/rev2/under | helix/rev2/under | -- |
| | helix/rev2/under/oled | helix/rev2/under/oled | ( --> helix/rev2/under) |
#### Update the Speedo firmware for v3.0 ([#10657](https://github.com/qmk/qmk_firmware/pull/10657))
The Speedo keyboard has moved to `cozykeys/speedo/v2` as the designer prepares to release the Speedo v3.0.
| Previous Name | New Name |
| :------------ | :------------------------- |
| speedo | cozykeys/speedo/v2 |
| -- | cozykeys/speedo/v3 **new** |
#### Maartenwut/Maarten name change to evyd13/Evy ([#10274](https://github.com/qmk/qmk_firmware/pull/10274))
Maartenwut has rebranded as @evyd13, and all released Maartenwut boards have moved.
| Previous Name | New Name |
| :--------------------- | :----------------- |
| maartenwut/atom47/rev2 | evyd13/atom47/rev2 |
| maartenwut/atom47/rev3 | evyd13/atom47/rev3 |
| maartenwut/eon40 | evyd13/eon40 |
| maartenwut/eon65 | evyd13/eon65 |
| maartenwut/eon75 | evyd13/eon75 |
| maartenwut/eon87 | evyd13/eon87 |
| maartenwut/eon95 | evyd13/eon95 |
| maartenwut/gh80_1800 | evyd13/gh80_1800 |
| maartenwut/gh80_3700 | evyd13/gh80_3700 |
| maartenwut/minitomic | evyd13/minitomic |
| maartenwut/mx5160 | evyd13/mx5160 |
| maartenwut/nt660 | evyd13/nt660 |
| maartenwut/omrontkl | evyd13/omrontkl |
| maartenwut/plain60 | evyd13/plain60 |
| maartenwut/pockettype | evyd13/pockettype |
| maartenwut/quackfire | evyd13/quackfire |
| maartenwut/solheim68 | evyd13/solheim68 |
| maartenwut/ta65 | evyd13/ta65 |
| maartenwut/wasdat | evyd13/wasdat |
| maartenwut/wasdat_code | evyd13/wasdat_code |
| maartenwut/wonderland | evyd13/wonderland |
#### Xelus Valor and Dawn60 Refactors ([#10512](https://github.com/qmk/qmk_firmware/pull/10512), [#10584](https://github.com/qmk/qmk_firmware/pull/10584))
The Valor and Dawn60 keyboards by Xelus22 both now require their revisions to be specified when compiling.
| Previous Name | New Name |
| :------------ | :---------------- |
| xelus/dawn60 | xelus/dawn60/rev1 |
| xelus/valor | xelus/valor/rev1 |
### Updated Keyboard Codebases :id=keyboard-updates
#### AEboards EXT65 Refactor ([#10820](https://github.com/qmk/qmk_firmware/pull/10820))
The EXT65 codebase has been reworked so keymaps can be used with either revision.
## Core Changes :id=core-changes
### Fixes :id=core-fixes
* Reconnect the USB if users wake up a computer from the keyboard to restore the USB state ([#10088](https://github.com/qmk/qmk_firmware/pull/10088))
* Fix cursor position bug in oled_write_raw functions ([#10800](https://github.com/qmk/qmk_firmware/pull/10800))
### Additions and Enhancements :id=core-additions
* Allow MATRIX_ROWS to be greater than 32 ([#10183](https://github.com/qmk/qmk_firmware/pull/10183))
* Add support for soft serial to ATmega32U2 ([#10204](https://github.com/qmk/qmk_firmware/pull/10204))
* Allow direct control of MIDI velocity value ([#9940](https://github.com/qmk/qmk_firmware/pull/9940))
* Joystick 16-bit support ([#10439](https://github.com/qmk/qmk_firmware/pull/10439))
* Allow encoder resolutions to be set per encoder ([#10259](https://github.com/qmk/qmk_firmware/pull/10259))
* Share button state from mousekey to pointing_device ([#10179](https://github.com/qmk/qmk_firmware/pull/10179))
* Add advanced/efficient RGB Matrix Indicators ([#8564](https://github.com/qmk/qmk_firmware/pull/8564))
* OLED display update interval support ([#10388](https://github.com/qmk/qmk_firmware/pull/10388))
* Per-Key Retro Tapping ([#10622](https://github.com/qmk/qmk_firmware/pull/10622))
* Allow backlight duty cycle limit ([#10260](https://github.com/qmk/qmk_firmware/pull/10260))
* Add step sequencer feature ([#9703](https://github.com/qmk/qmk_firmware/pull/9703))
* Added `add_oneshot_mods` & `del_oneshot_mods` ([#10549](https://github.com/qmk/qmk_firmware/pull/10549))
* Add AT90USB support for serial.c ([#10706](https://github.com/qmk/qmk_firmware/pull/10706))
* Auto shift: support repeats and early registration (#9826)
### Clean-ups and Optimizations :id=core-optimizations
* Haptic and solenoid cleanup ([#9700](https://github.com/qmk/qmk_firmware/pull/9700))
* XD75 cleanup ([#10524](https://github.com/qmk/qmk_firmware/pull/10524))
* Minor change to behavior allowing display updates to continue between task ticks ([#10750](https://github.com/qmk/qmk_firmware/pull/10750))
* Change some GPIO manipulations in matrix.c to be atomic ([#10491](https://github.com/qmk/qmk_firmware/pull/10491))
* combine repeated lines of code for ATmega32U2, ATmega16U2, ATmega328 and ATmega328P ([#10837](https://github.com/qmk/qmk_firmware/pull/10837))
* Remove references to HD44780 ([#10735](https://github.com/qmk/qmk_firmware/pull/10735))
## QMK Infrastructure and Internals :id=qmk-internals
* Add ability to build a subset of all keyboards based on platform. ([#10420](https://github.com/qmk/qmk_firmware/pull/10420))
* Initialise EEPROM drivers at startup, instead of upon first execution ([#10438](https://github.com/qmk/qmk_firmware/pull/10438))
* Make bootloader_jump weak for ChibiOS ([#10417](https://github.com/qmk/qmk_firmware/pull/10417))
* Support for STM32 GPIOF,G,H,I,J,K ([#10206](https://github.com/qmk/qmk_firmware/pull/10206))
* Add milc as a dependency and remove the installed milc ([#10563](https://github.com/qmk/qmk_firmware/pull/10563))
* ChibiOS upgrade: early init conversions ([#10214](https://github.com/qmk/qmk_firmware/pull/10214))
* ChibiOS upgrade: configuration file migrator ([#9952](https://github.com/qmk/qmk_firmware/pull/9952))
* Add definition based on currently-selected serial driver. ([#10716](https://github.com/qmk/qmk_firmware/pull/10716))
* Allow for modification of output RGB values when using rgblight/rgb_matrix. ([#10638](https://github.com/qmk/qmk_firmware/pull/10638))
* Allow keyboards/keymaps to execute code at each main loop iteration ([#10530](https://github.com/qmk/qmk_firmware/pull/10530))
* qmk cformat ([#10767](https://github.com/qmk/qmk_firmware/pull/10767))
* Add a Make variable to easily enable DEBUG_MATRIX_SCAN_RATE on the command line ([#10824](https://github.com/qmk/qmk_firmware/pull/10824))
* update Chibios OS USB for the OTG driver ([#8893](https://github.com/qmk/qmk_firmware/pull/8893))
* Fixup version.h writing when using `SKIP_VERSION=yes` ([#10972](https://github.com/qmk/qmk_firmware/pull/10972), [#10974](https://github.com/qmk/qmk_firmware/pull/10974))
* Rename ledmatrix.h to match .c file ([#7949](https://github.com/qmk/qmk_firmware/pull/7949))
* Split RGB_MATRIX_ENABLE into _ENABLE and _DRIVER ([#10231](https://github.com/qmk/qmk_firmware/pull/10231))
* Split LED_MATRIX_ENABLE into _ENABLE and _DRIVER ([#10840](https://github.com/qmk/qmk_firmware/pull/10840))
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