* New and improved lock LED callbacks

* Include stdbool

* Update documentation

* Use full function signatures and add keyboard-level example

* Convert Dynamic Macro to a Core Feature

This imports the code from Dynamic Macro into the core code, and handles it, as such.

This deprecates the old method but does not remove it, for legacy support. This way, no existing user files need to be touched.

Additionally, this reorganizes the documentation to better reflect the changes.

Also, it adds user hooks to the feature so users can customize the existing functionality.

Based heavily on and closes #2976

* Apply suggestions from code review

Co-Authored-By: fauxpark <fauxpark@gmail.com>
Co-Authored-By: noroadsleft <18669334+noroadsleft@users.noreply.github.com>

* Cleanup based on feedback

* Add short-form keycodes and document them

- add short-form keycodes to quantum/quantum_keycodes.h
- document the new aliases in docs/feature_dynamic_macros.md

* Add Dynamic Macros section and keycodes to docs/keycodes.md

* Make anti-nesting optional

* Add documentation for DYNAMIC_MACRO_NO_NESTING option

* Fix Merge artifacts

* Fix formatting typo in docs

Co-Authored-By: James Young <18669334+noroadsleft@users.noreply.github.com>

* Remove DYNAMIC_MACRO_RANGE as it's not needed

* Fix includes and layer var type

* Initial migration of software PWM backlight

* First pass at backlight driver docs

* Correct driver name in docs

* Run backlight_task when using BACKLIGHT_PINS

* Resolve backlight docs TODOs

* Add Dip Switches as a core feature

* Add documentation for Dip Switch feature

* Update Preonic Rev3 to use new feature and remove custom matrix

* Apply suggestions from code review

Co-Authored-By: noroadsleft <18669334+noroadsleft@users.noreply.github.com>

* Remove custom matrix line completely

Rather than just disabling it

Co-Authored-By: fauxpark <fauxpark@gmail.com>

* DIP changes

Co-Authored-By: fauxpark <fauxpark@gmail.com>

* Use better check for DIP Switch configuration

* Add to show features

* Add bitmask callback for dip switch

* Fix OLKB Boards dip switch config

* Update docs to include bitmask example

* Fix comments/documentation

Co-Authored-By: fauxpark <fauxpark@gmail.com>

* Fix issues with docs and use example from @tuzonghua

* Fix wording

Co-Authored-By: fauxpark <fauxpark@gmail.com>

* Fix example to use proper formatting

Bad, BAAAAAAD drashna!!!

* Handle dip switch initialization better

* A little easier to read the definition of the GPIO control macro for AVR.

No change in build result.

* Changed to not use GNU statement expression extension.

No change in build result.

* Modified split_common/serial.c to use qmk_firmware standard GPIO control macro.

No change in build result.

* fix PE6 -> E6

* remove some space

* add some comment to config_common.h

* Changed split_common/serial.c to use a newer version of qmk_firmware standard GPIO control macro.

* Additional changes for Layer State typedef compatibility

* Replace biton32 with get_highest_layer in docs

* Change additional layer structure code

* Fix uGFX reference issue

* Remove dynamic_keymap check

* Where did all these extra spaces come from

Co-Authored-By: fauxpark <fauxpark@gmail.com>

* Align sendstring LUTs to 9 characters wide

* Replace 0 with XXXXXXX

* Use decimal 128 for LUT size

* Align heading comments

* Add ASCII table comments

* Add missing AltGr LUTs and adjust keycode LUTs accordingly

* Use pragma once

* Correct a couple more keycodes

* Capitalise "BÉPO"

* Also clean up the default tables

* Tidy up Belgian and Norman LUTs

* Fix up GPIO macros

* Fix up send string macros

`string` arguments must not be parenthesized

* Fix up miscellaneous macros

* Make indentation uniform (4 spaces)

* Make #ifdef vs #if defined usage consistent

* Reorder standard includes

* Revert indentation changes as per review comments

* Revert #if defined(__AVR__) → #ifdef __AVR__ change

* Change 2 space indent to 4 spaces on a couple of lines

* Replace include guard with #pragma once

* Typedef'ed layer_state_t to uint32_t.

This enables future work with layer_state_t to uint8_t for optimization purposes.

* Removed accidental xeal60 commit

* Revert to egyptian brackets, added sizeof(layer_state_t) so when layer_state_t is redefined it will automagically work.

* Add additional typedefs

* Add checks for setting layer state

* Update tmk_core/common/action_layer.h

Co-Authored-By: alex-ong <the.onga@gmail.com>

* Revert commit.

* Simplifying and Extending Space Cadet to work on Ctrl and Alt keys

* PR Review feedback

* Reverting back to keycodes

With my XD60, I noticed that when typing the backlight was flickering.

The XD60 doesn't have the backlight wired to a hardware PWM pin.
I assumed it was a timing issue in the matrix scan that made the PWM
lit the LED a bit too longer. I verified it because the more keys that
were pressed, the more lighting I observed.

This patch makes the software PWM be called during CPU interruptions.
It works almost like the hardware PWM, except instead of using
the CPU waveform generation, the CPU will fire interruption
when the LEDs need be turned on or off.

Using the same timer system as for hardware PWM, when the counter
will reach OCRxx (the current backlight level), an Output Compare
match interrupt will be fired and we'll turn the LEDs off.
When the counter reaches its maximum value, an overflow interrupt
will be triggered in which we turn the LEDs on.
This way we replicate the hardware backlight PWM duty cycle.

This gives a better time stability of the PWM computation than pure
software PWM, leading to a flicker free backlight.

Since this is reusing the hardware PWM code, software PWM also supports
backlight breathing.

Note that if timer1 is used for audio, backlight will use timer3, and if
timer3 is used for audio backlight will use timer1.
If both timers are used for audio, then this feature is disabled and we
revert to the matrix scan based PWM computation.

Signed-off-by: Brice Figureau <brice@daysofwonder.com>

* Add customizable tapping terms

* Add Documentation

* Fix function

* Fixes

* It's not a pointer

* Add debugging output

* Update documentation to be at least vaguely accurate

* Use `get_tapping_term(tapping_key.event)` instead

`e` doesn't include column and row information, properly. It registers as 255, regardless of the actual keypress.

However `tapping_key.event` actually gives the correct column and row information.  It appears be the correct structure to use. 

In fact, it looks like the issue is that `e` is actually the "TICK" structure, as defined in keyboard.h

* Use variable tapping term value rather than define

* Silly drashna - tapping_key.event, not event

* add get_event_keycode() function

* Fix typo

Co-Authored-By: drashna <drashna@live.com>

* Remove post_process_record_quantum since it's the wrong PR

* Update quantum/quantum.c

Co-Authored-By: drashna <drashna@live.com>

* Better handle ifdef statement for permissive hold

Since we can't be sure that tapping term is actually 500

* Update quantum.c comments based on feedback

* Clean up get_tapping_term function

Clean up function so that users don't need to call the event function, and instead only check the keycode

* Add ability to run functionality on and off

* Make ifdef's more compact

* Update split_common to use standard i2c drivers

* Eliminate RGB_DIRTY/BACKLIT_DIRTY

* Fix avr i2c_master error handling

* Fix i2c_slave addressing

* Remove unneeded timeout on i2c_stop()

* Fix RGB I2C transfers

* Remove incorrect comment

* initial work to add eeprom to haptic feedback and decouple the feedback process from keyboards

* Haptic feedback enhancements: on/off toggle working, feedback order working
todo:
-work on modes switching
-get modes switching to save to eeprom

* haptic enhancement - eeprom and modes added

* Added set and get functions for haptic feedback

* initial implementation of solenoids under haptic feedback

* changed eeprom to 32 bits to reserve blocks for future features

* start documentation of haptic feedback

* change keycode per comment from reviewers

* typo fixes

* added eeprom for solenoid configs

* added solenoid and docs

* Add/fix default parameters configs, improve docs

* more doc cleanup

* add in solenoid buzz toggle, clean up doc

* some fixes for error in compiling solenoid

* fix a chibios specific i2c read function and added one for AVR controllers in DRV2605L.c

* fixes for avr side issues

* update keymap

* fix keymap compile error

* fix bugs found during solenoid testing

* set pin that is not powered during bootloader

* added warning about certain pins on the MCU may trip solenoid during DFU/bootloader

I think `quantum.h` should contain only API declarations that `quantum.c` provides externally. `rgb.h` contains function weak definitions. This should not be in `quantum.h`.

* Add delay in Tap Code to avoid issues

I think a few people have reporting issues with it working properly, and it may be a timing issue.  The 'register_code' uses this sort of delay in some of the functions, and
this is probably why.

Adding the 100ms delay should hopefully fix any issues with it.

* Make tap_code delay configurable

* Update documentation

* Bring tap_code16 inline with changes

* Fix type for tap_code16

Bad copy-paste job

* Just use the value check for the define

* Clarify timing in docs

Co-Authored-By: drashna <drashna@live.com>

* Wordsmithing

Co-Authored-By: drashna <drashna@live.com>

* Add standard ALGR defition, remove (re)definitions from language files

* Use ALGR(kc) consistently in ALTGR(kc) aliases

* Non-Nordic keymaps should not use NO_ALGR

* Add standard KC_ALGR definition

* Update docs with ALGR and KC_ALGR

* Update SS_ALGR and ALGR_T aliases

* add computed pins from mcu type

* update for atmega32a

* doc typo

* add atmega16 chips, link to references

* remove avr include from config

* exclude assembler in config.h includes

* consolodate options, add 646

* fix typo in pindef

* Preliminary additon of bootmagic lite functionality

* Cleanup code

* Clean up bootmagic code

* Add documentation and clean up code

* Make 'lite' an option for BOOTMAGIC_ENABLE

* Update Templates with note about Bootmagic Lite option

* Detect Debounce variable

* Make sure debounce is a non-zero number

* Capitalize Bootmagic

* Capitalize bootmagic

* Update wording

* Re-add EEPROM reset, by popular demand

And add eeprom-less version to drashna userspace for his sanity

* Fix spacing

* Set BOOTMAGIC_ENABLE to use full/lite/off

And default yes to "full" for compatibility

* Add Bootmagic lite info to templates

* Remove text from makefiles

* Cleanup of makefile

* mention yes in bootmagic docs

* Wordsmitthing the docs

* Fix white spaces

* Readd default bootmagic setting, because it's necessary

* Force require TAPPING_TERM if Tap Dance is enabled

* Handle lack of TAPPING_TERM more gracefully

* Update quantum matrix to support both AVR and Chibios ARM

- Addition of STM32 pin definitions
- Created abstruction layer defines to control GPIO (This is a bit pointless for Chibios as we are creating a PAL ontop of a PAL but it is necessary for uniformity with AVR)
- Modified matrix.c to use the above functions

* minor ifdef fix

* Rename of functions and docs

- Added documentation.
- Renamed functions according to Jack's spec.

* Massdrop fix

* Update matrix.c

* Update quantum.h

* Update quantum.h

* Update quantum.h

* Update internals_gpio_control.md

* Remove chording as it is not documented, not used, and needs work.

* Make Leader Key an optional feature.

* Switch from `PREVENT_STUCK_MODIFIERS` to `STRICT_LAYER_RELEASE`

* Remove `#define PREVENT_STUCK_MODIFIERS` from keymaps.

* add temporary test code rgblight-macro-test1.[ch]

* rgblight.h : mode auto numberring and auto generate mode name symbol

No change in build result.

* rgblight.c use RGBLIGHT_MODE_xxx symbols

No change in build result.

* quantum.c use RGBLIGHT_MODE_xxx symbols

No change in build result.

* fix build break. when RGB_MATRIX_ENABLE defined

* add temporary test code rgblight-macro-test2.[ch]

* modify rgblight_mode_eeprom_helper() and rgblight_sethsv_eeprom_helper()

* modify rgblight_task()

* configurable each effect compile on/off in config.h

* update docs/feature_rgblight.md

* fix conflict. docs/feature_rgblight.md

* remove temporary test code rgblight-macro-test*.[ch]

* fix comment typo.

* remove old mode number from comment

* update docs/feature_rgblight.md about effect mode

* Revert "update docs/feature_rgblight.md about effect mode"

This reverts commit 43890663fc.

* some change docs/feature_rgblight.md

* fix typo

* docs/feature_rgblight.md update: revise mode number table

* ISSI31FL3733 driver

- Addapted IS31 driver for the above driver

* fix my branch

* ISSI31FL3733 driver

- Inclusion of above ISSI led driver

* IS31fl3733 driver

- Added correct function for control registers

* Finalized support for ISSI31fl3733 led driver

- Finalized and tested driver.
- Modified i2c_master for arm due to declaration mistake.
- Fixed spaces/tabs in quantum.h file.
- Fixed spaces/tabs in common_features.mk file.
- Removed unnecessary includes from rgb_matrix.c file.
- Added local definitions for MIN and MAX macros in rgb_matrix.c file.
- Adjusted chevron effect.
- Added necessary define (RGB_3733_MATRIX_ENABLE) for makefile.
- Added necessary C define (ISSI3733) to aid with inclusion of the correct header file.
- Added documentation for the new driver.

* Driver structure update

- Changed rule includes to be more condensed (RGB_MATRIX_ENABLE = IS31FL3731) and (RGB_MATRIX_ENABLE = IS31FL3733)
- Updated documentation
- Reverted to the use of differently named functions for each driver and selecting the needed ones within rgb_matrix.c

* ISSI Drivers refractoring

- Moved issi drivers in a dedicated folder
- Updated documentation

* I2C library fix

I released the special pins incorrectly before. It is now fixed.

* Make sure Planck light calls user suspend functions

* Add suspend.h include to quantum.h for kb/user function compatibility

* Bocaj Layout Revamp

* Pull in Upstream (#1)

* Various tweaks for some Input:Club build processes

* change KEYMAP to LAYOUT for all new keyboards made using this script

* Add support for rev3 of the Atom47 (#2672)

* Added support for rev3 of the Atom47

* Updated Atom47 readme's

* Fix redefine error on rev2 and add maartenwut's keymap

* Fix redefine error on LEdiodes keymap

* Add Nyquist keymap (#2692)

* nyquist

* danielhklein nyquist setup

* shift left controls

* remove readme

* cleanup before pr

* ready for pr

* Adds Phantom TKL support (#2696)

* Add an info.json to phantom keyboard

* Add layouts

 - KEYMAP_WINKEYLESS
 - KEYMAP_7BIT
 - KEYMAP_ISO
 - KEYMAP_ISO_WINKEYLESS

* Add key_counts

* Add 2 missing F-Row keys

* Add TKC1800 info.json

Created an info.json for the tkc1800.

* Clueboard 60 info.json

 - adds
   - LAYOUT_60_ansi
   - LAYOUT_60_iso
   - KEYMAP_AEK
   - KEYMAP
   - LAYOUT_60_ansi_split_bs_rshift

* Add the Speedo keyboard

* Fix KC60 info.json file (#2707)

* change KEYMAP to LAYOUT in all the KC60 files

* Redo the info.json file

* Small fixes to TKC1800

 - adjust F-row to use 0.25 spacing
 - split left shift
 - add key_count

* Fix some Configurator Warnings regarding LAYOUT vs KEYMAP (#2708)

* change diverge 3 KC_KEYMAP to LAYOUT

* Change KEYMAP to LAYOUT for handwired arrow pad

* change M10A to LAYOUT for m10-a

* Change KC_KEYMAP to LAYOUT_kc and KEYMAP to LAYOUT for mf68

* change KC_KEYMAP to LAYOUT for nano

* Refactor to LAYOUT

* refactor to LAYOUT-ansi and LAYOUT_iso for s65

* LAYOUT conversions for lfkkeyboards

* missed a few renames

* mini1800 for lfkeyobards support of LAYOUT

* Improve state/chord handling and clean up namespace

Some values that can never, ever, change were held in local
variables, rather than in PROGMEM. Fixed.

Change "pressed" to a signed int so the test for < 0 makes
sense, and to avoid possible weird failure modes in the
case where a key release comes in when pressed is already
zero. (Shouldn't happen, sure, but computers are weird.)

A lot of things in process_steno had external linkage for no
particular reason. They've been marked static. Stuff still
builds.

Distinguish between currently-held keys and keys that have
been held, and expose these values through a nicely-named API
so other code could, say, check on the current set of steno
chording in order to make displays. Also in passing fix up the
"state" value having external linkage so it could clash with
other people's variable declarations.

The API also provides hooks for key processing and steno chord
events, so you can monitor those events without having to
run in matrix_scan_user and recheck the values directly. Also
document these.

There is no path through processing a key that doesn't
end with a return false, so the nested return foo() are
gone and we just return false.

* Pull information from config.h and rules.mk (#2711)

* Pull information from config.h and rules.mk

* Readd the kbd75 maintainer

* Remove obsolete info.json entries (#2712)

* Clean up some long-standing errors when populating the API (#2715)

* More Configurator Warning Fixes (#2716)

* mf68_ble did not have the correct .c and .h files

* Fix JC65 KEYMAP to LAYOUT

* Change KEYMAP to LAYOUT for s60_x

* Convert KEYMAP to LAYOUT for lets_split boards

* Convert KEYMAP to LAYOUT

* more fixes to keymap for iris

* convert KEYMAP to LAYOUT for levinson keyboard

* change losinggeneration's KEYMAP to LAYOUT

* convert KEYMAP to LAYOUT

* convert KEYMAP to LAYOUT for nyquist

* convert KEYMAP to LAYOUT

* convert KEYMAP to LAYOUT for viterbi

* convert KEYMAP to LAYOUT

* convert KEYMAP and its subsidiries to the LAYOUT standard

* convert KEYMAP and its subsidiries to the new LAYOUT standard

* Normacos keymap for let's split keyboard (#2691)

* Cheers let's split keymap

* fixed typo on norman layer of cheers keymap for let's split

* fixed right handed mappings for home row

* cheers keymap for let's split redefinition

* updated Cheers keymap for let's split

* cheers keymap for let's split updated with some terminal macros

* renamed cheers let's split keymap to a more appropriate normacos

* updated normacos keymap doc / removed non functional keys

* reset let's split rules to default values

* added more spotlight search macros

* normalized keymap comments

* Moved numpad on lower layer

* hhkb jp personal keymap (#2698)

* Add JJ40 Cockpit personal keymap (#2713)

* Add JJ40 Cockpit keymap

* Fix lower layer symbols

* Add readme for "major" keyboards to eliminate more QMK Configurator errors (#2718)

* add readme to ktype keyboard

* add readme to m10a

* add readme to mini1800

* add readme to parent directory

* Revert "Pull in Upstream (#1)"

This reverts commit eeba0cec17.

* Updates to Bocaj Files

- Gave up on Tap Dance for ' -> '
+ Added another 'Secret'
+ Add ' -> ' to the Swap Hands key
+ Add Swap Hands to the ' -> ' key
+ Made Hand Swapping a momentary toggle
- Removed Auto Shift
+ Added Layer Toggle to KC_QUOTE for the _TOOLS layer
- Disabled Tap Dance

* Merge remote-tracking branch 'upstream/master'

* Updates to Bocaj

Added Game Layers, Removed Unused Macros

* Removed 'secrets.h'

* Updates to Bocaj

Remove 'secrets'.
Remove 'sendstring_workman.h' and set related layer back to qwerty due to macro compatibility issues

* Total revisioning of keymap and layout structure

* Missed readme.md file

* Bocaj - Permissive Hold setting enabled

* Line ending stuff again

* Added Let's Split Eh? Files and updated #USE_IC2 checks to also include th EH revision (can only be used in I2C)

* Added personal keymap, updated some of the EH files

* Created new keyboard file for testing "lets_split_eh" will merge into lets_split once fully functional

* Added split code from lets_split, removed pro micro imports and LED code

THIS IS WORKING CODE, WITHOUT RGB AND BACKLIGHT

* Took back original Lets Slit files for the lets_split keyboard, working in the lets_split_eh folder for now

* Updated eh.c

* More rework of the I2C code, added global flags for split boards.

* Introduced RGB over I2C, having weird edge case issues at the moment though

* Fixed weird I2C edgecase with RGB, although still would like to track down route cause..

* Changed RGB keycodes (static ones) to activate on key-up instead of key-down to elimate weird ghosting issue over I2C

* Lots of changes, mainly externalized the Split keyboard code and added logic for only including when needed.

- Added makefile option "SPLIT_KEYBOARD" that when = yes will include the split keyboard files and custom matrix
- Split keyboard files placed into quantum/split_common/
- Added define option for config files "SPLIT_HAND_PIN" FOr using high/low pin to determine handedness, low = right hand, high = left hand
- Cleaned up split logic for RGB and Backlight so it is only exectuted / included when needed

* Updated documentation for the new makefile options and #defines specific to split keyboards

* Added a bit more info to docs, so people aren't confused

* Modifed Let's Split to use externalized code, also added left and right hand eeprom files to the split_common folder

* Removed some debugging from eh.c

* Small changes to keyboard configs. Also added a default keymap (just a copy of my that_canadian keymap).

* Added a README file to the Let's Split Eh?

* Changed it so RGB static updates are done on key-up ONLY for split boards rather than all boards. Also fixed leftover un-used variable in rgblight.c

* Updated default keymap and my keymap for Let's Split Eh? Updated the comments so it reflects RGB control, and removed audio functions.

* Fixed lets_split_eh not having a default version

* Removed "eh" references from lets_split folder for now

* Took lets_split folder from master to fix travis build errors, weird my local was overriding.

* Changed LAYOUT_ortho_4x12_kc -> LAYOUT_kc_ortho_4x12 to match bakingpy and others

* Removed rules.mk from my lets_split keymap, not needed

* Updated the config_options doc to better explain the usage of "#define SPLIT_HAND_PIN"

* integrated Peter Fleury's LCD library for HD44780 LCDs

* fixed typo

* cleanup finished

* add documentation

* added HD44780 documentation

* removed keyboard from .gitmodules

* resolved merge conflict

* removed edit of kira75s rules.mk made by merge

* moved hd44780 to drivers/avr

* Added licence info to hd44780 files

* Added link to hd44780 docs.

* adds is31fl3731 rgb matrix implementation

* fix build script for force pushes

* allow bootloader size to be overwritten

* adds planck light implementation

* split led config into 2 arrays

* idk

* betterize register handling

* update planck implementation

* update planck

* refine rgb interface

* cleanup names, rgb matrix

* start documentation

* finish up docs

* add effects list

* clean-up merge

* add RGB_MATRIX_SKIP_FRAMES

* add support for at90usb1286 to bootloader options

* Change handling of adjust layer to make it more LT(...) friendly.

* Update based on feedback from drashna.

* Change handling of adjust layer to make it more LT(...) friendly.  This reworks handling to make it a little more friendly to include in keymaps.

* Fix Audio Clicky feature

* Add to features

* Move lufa descriptor to protocol/usb_descriptor

* Try to compile usb_descriptor on ChibiOS

* Add lufa_utils for ChibiOS

Lufa USB descriptors for ChibiOS

* More lufa_util compatibility fixes

* First compiling version of shared USB descriptor

* Send the usb descriptors

* Fix the CONSOLE output on ChibiOS

* Add errors for unsupported interfaces

* Enable support for vitual serial port USB descriptors

* Implement virtual serial port for ChibiOS

* Cleanup the lufa_utils

Use the default lufa header files

* Add raw hid support for ChibiOS

This is completely untested

* Enable midi compilation on ChibiOS

* Move midi functionality out of lufa.c

* Don't register sysex callback when not needed

* ChibiOS compilation fixes

* Update ChibiOS submodule

* Fix the Midi USB descriptor

It didn't work properly when both Midi and Virtual serial port was enabled.

* Add MIDI support for ChibiOS

* Fix USB descriptor strings on ChibiOS

* Use serial usb driver for raw hid

* Generalize the ChibiOS stream like drivers

This makes the initialization much more simple and eliminates a lot of
the code duplication.

* Convert console output to chibios stream driver

* Fixes for ChibiOS update

* Update the ChibiOS contrib submodule

To include the usb data toggle synchronization fixes

* Fix duplicate reset enumeration on ChibiOS

* Add missing include

* Add number of endpoints check for ChibiOS

* Enable serial USB driver on all keyboards

* Add missing includes when API is enabled withot midi

* Add another missing inlcude

* add breathing to bananasplit

* backlight breathing overhaul

* fix the backlight_tick thing.

* fix for vision_division backlight

* fix a few keymaps and probably break breathing for some weirdly set-up boards.

* remove BL_x keycodes because they made unreasonable assumptions

* some fixes for BL keycodes

* integer cie lightness scaling

* use cie lightness for non-breathing backlight and make breathing able to reach true max brightness

* implement basic terminal stuff

* modify send_string to read normal strings too

* add files bc yeah. working pgm detected

* pgm detection apparently not working

* adds send string keycodes, additional keycode support in send string

* implement arguments

* [terminal] add help command

* [terminal] adds keycode and keymap functions

* [terminal] adds nop.h, documentation

* update macro docs

Requires virtser; Allows QMK to speak the TX BOlt protocol used by stenography machines and software (such as Plover). The upside is that Plover can be configured to listen only to TX Bolt allow the keyboard to switch layers without need to enable/disable the Plover software, or to have a second non-Steno keyboard work concurrently.