Velocikey: Match RGB animation speed to typing speed (#3754)

* Draft commit of typing speed RGB control

* More information in the readme

* Support all RGB animation modes (Fixes #1)

* Added support for all RGB light modes to use typing speed

Except christmas lights because that is seizure-inducing at high speeds!

* Introduced a value range specific to each RGB mode

Because some modes are a little too much when running at full speed!

* Update readme.md

* Update readme.md

* Re-arrange typing_speed definitions (Fixes #5) (#6)

* Re-arrange variable definitions to avoid including quantum.h from rgblight.c

* Fix a compilation error when trying to run make test:all

* Tweaks to the typing speed decay rate

* Renamed to momentum; moved implementation into dedicated files

* Groundwork for toggling momentum on/off (currently always on)

* Add EEPROM toggle for momentum-matching

* Moved momentum out of RGBLIGHT_ENABLE toggles so it's more generic

* Move momentum decay task out of rgblight_task()

* Fix missing momentum.h in lufa.c

* Experimental LED support (untested)

* Draft commit of typing speed RGB control

* More information in the readme

* Support all RGB animation modes (Fixes #1)

* Added support for all RGB light modes to use typing speed

Except christmas lights because that is seizure-inducing at high speeds!

* Introduced a value range specific to each RGB mode

Because some modes are a little too much when running at full speed!

* Update readme.md

* Update readme.md

* Re-arrange typing_speed definitions (Fixes #5) (#6)

* Re-arrange variable definitions to avoid including quantum.h from rgblight.c

* Fix a compilation error when trying to run make test:all

* Tweaks to the typing speed decay rate

* Renamed to momentum; moved implementation into dedicated files

* Groundwork for toggling momentum on/off (currently always on)

* Add EEPROM toggle for momentum-matching

* Moved momentum out of RGBLIGHT_ENABLE toggles so it's more generic

* Move momentum decay task out of rgblight_task()

* Fix missing momentum.h in lufa.c

* Added documentation

* Renamed feature to velocikey

* Reverted readme to original state

* Correct the readme title

* Updated feature name in the docs

* Update EECONFIG name

* Add compile-time toggles for velocikey

* Update feature documentation

* Revert "Merge branch 'led-support' into master"

This reverts commit e123ff5febf61639b9a9020748e1c2e2313460ff, reversing
changes made to df111a55b9d4929182e16108b1c0ead15b16df97.

* Move velocikey EECONFIG definition to depend on VELOCIKEY_ENABLE

* Rename decay_task function to decelerate

* Apply suggestions from code review

Co-Authored-By: chrislewisdev <chris@chrislewisdev.com>

* Re-order eeconfig definitions

* Apply coding conventions

* Apply #ifdef check in lufa.c

* Refactored interval time checks into one functionc

* Small rename

* Fix unused function error for layouts not using all rgb effects

* Only update EEPROM if Velocikey is enabled

* Incorporate code review feedback

* Small adjustment to top-end decay rate

* Add Velocikey documentation to table of contents

* Bring tetris:default keymap size down by disabling audio

11 files changed, 158 insertions, 6 deletions

diff --git a/common_features.mk b/common_features.mk
index 3d3b8506e4..f5bef3d5dd 100644
--- a/common_features.mk
+++ b/common_features.mk
@@ -266,6 +266,11 @@ ifeq ($(strip $(HD44780_ENABLE)), yes)
     OPT_DEFS += -DHD44780_ENABLE
 endif
 
+ifeq ($(strip $(VELOCIKEY_ENABLE)), yes)
+    OPT_DEFS += -DVELOCIKEY_ENABLE
+    SRC += $(QUANTUM_DIR)/velocikey.c
+endif
+
 ifeq ($(strip $(DYNAMIC_KEYMAP_ENABLE)), yes)
     OPT_DEFS += -DDYNAMIC_KEYMAP_ENABLE
     SRC += $(QUANTUM_DIR)/dynamic_keymap.c
diff --git a/docs/_summary.md b/docs/_summary.md
index 6bc7471896..09ea9e6e79 100644
--- a/docs/_summary.md
+++ b/docs/_summary.md
@@ -76,6 +76,7 @@
   * [Thermal Printer](feature_thermal_printer.md)
   * [Unicode](feature_unicode.md)
   * [Userspace](feature_userspace.md)
+  * [Velocikey](feature_velocikey.md)
 
 * For Makers and Modders
   * [Hand Wiring Guide](hand_wire.md)
diff --git a/docs/feature_velocikey.md b/docs/feature_velocikey.md
new file mode 100644
index 0000000000..5d98410735
--- /dev/null
+++ b/docs/feature_velocikey.md
@@ -0,0 +1,30 @@
+# Velocikey
+
+Velocikey is a feature that lets you control the speed of lighting effects (like the Rainbow Swirl effect) with the speed of your typing. The faster you type, the faster the lights will go!
+
+## Usage
+For Velocikey to take effect, there are two steps. First, when compiling your keyboard, you'll need to set `VELOCIKEY_ENABLE=yes` in `rules.mk`, e.g.:
+
+```
+BOOTMAGIC_ENABLE = no
+MOUSEKEY_ENABLE = no
+STENO_ENABLE = no
+EXTRAKEY_ENABLE = yes
+VELOCIKEY_ENABLE = yes
+```
+
+Then, while using your keyboard, you need to also turn it on with the VLK_TOG keycode, which toggles the feature on and off.
+
+The following light effects will all be controlled by Velocikey when it is enabled:
+ - RGB Breathing
+ - RGB Rainbow Mood
+ - RGB Rainbow Swirl
+ - RGB Snake
+ - RGB Knight
+
+Support for LED breathing effects is planned but not available yet.
+
+ As long as Velocikey is enabled, it will control the speed regardless of any other speed setting that your RGB lights are currently on.
+
+ ## Configuration
+ Velocikey doesn't currently support any configuration via keyboard settings. If you want to adjust something like the speed increase or decay rate, you would need to edit `velocikey.c` and adjust the values there to achieve the kinds of speeds that you like.
diff --git a/quantum/quantum.c b/quantum/quantum.c
index cb4d5ee806..46d404029f 100644
--- a/quantum/quantum.c
+++ b/quantum/quantum.c
@@ -47,6 +47,10 @@ extern backlight_config_t backlight_config;
 #include "process_midi.h"
 #endif
 
+#ifdef VELOCIKEY_ENABLE
+#include "velocikey.h"
+#endif
+
 #ifdef HAPTIC_ENABLE
     #include "haptic.h"
 #endif
@@ -251,6 +255,10 @@ bool process_record_quantum(keyrecord_t *record) {
     //   return false;
     // }
 
+  #ifdef VELOCIKEY_ENABLE
+    if (velocikey_enabled() && record->event.pressed) { velocikey_accelerate(); }
+  #endif
+
   #ifdef TAP_DANCE_ENABLE
     preprocess_tap_dance(keycode, record);
   #endif
@@ -568,7 +576,14 @@ bool process_record_quantum(keyrecord_t *record) {
   #endif
     return false;
   #endif // defined(RGBLIGHT_ENABLE) || defined(RGB_MATRIX_ENABLE)
-    #ifdef PROTOCOL_LUFA
+  #ifdef VELOCIKEY_ENABLE
+    case VLK_TOG:
+      if (record->event.pressed) {
+        velocikey_toggle();
+      }
+      return false;
+  #endif
+  #ifdef PROTOCOL_LUFA
     case OUT_AUTO:
       if (record->event.pressed) {
         set_output(OUTPUT_AUTO);
diff --git a/quantum/quantum_keycodes.h b/quantum/quantum_keycodes.h
index 00c84cbf53..1ced6ae37e 100644
--- a/quantum/quantum_keycodes.h
+++ b/quantum/quantum_keycodes.h
@@ -422,6 +422,9 @@ enum quantum_keycodes {
     RGB_MODE_GRADIENT,
     RGB_MODE_RGBTEST,
 
+    //Momentum matching toggle
+    VLK_TOG,
+
     // Left shift, open paren
     KC_LSPO,
 
diff --git a/quantum/rgblight.c b/quantum/rgblight.c
index 45d521786e..57de56df70 100644
--- a/quantum/rgblight.c
+++ b/quantum/rgblight.c
@@ -30,6 +30,9 @@
 #include "rgblight.h"
 #include "debug.h"
 #include "led_tables.h"
+#ifdef VELOCIKEY_ENABLE
+  #include "velocikey.h"
+#endif
 
 #define _RGBM_SINGLE_STATIC(sym)   RGBLIGHT_MODE_ ## sym,
 #define _RGBM_SINGLE_DYNAMIC(sym)
@@ -607,6 +610,19 @@ void rgblight_sethsv_at(uint16_t hue, uint8_t sat, uint8_t val, uint8_t index) {
   rgblight_setrgb_at(tmp_led.r, tmp_led.g, tmp_led.b, index);
 }
 
+#if defined(RGBLIGHT_EFFECT_BREATHING) || defined(RGBLIGHT_EFFECT_RAINBOW_MOOD) || defined(RGBLIGHT_EFFECT_RAINBOW_SWIRL) \
+  || defined(RGBLIGHT_EFFECT_SNAKE) || defined(RGBLIGHT_EFFECT_KNIGHT)
+
+static uint8_t get_interval_time(const uint8_t* default_interval_address, uint8_t velocikey_min, uint8_t velocikey_max) {
+  return 
+#ifdef VELOCIKEY_ENABLE
+    velocikey_enabled() ? velocikey_match_speed(velocikey_min, velocikey_max) :
+#endif
+    pgm_read_byte(default_interval_address);
+}
+
+#endif
+
 void rgblight_setrgb_range(uint8_t r, uint8_t g, uint8_t b, uint8_t start, uint8_t end) {
   if (!rgblight_config.enable || start < 0 || start >= end || end > RGBLED_NUM) { return; }
 
@@ -707,6 +723,7 @@ void rgblight_show_solid_color(uint8_t r, uint8_t g, uint8_t b) {
 }
 
 void rgblight_task(void) {
+
   if (rgblight_timer_enabled) {
     // static light mode, do nothing here
     if ( 1 == 0 ) { //dummy
@@ -778,7 +795,9 @@ void rgblight_effect_breathing(uint8_t interval) {
   static uint16_t last_timer = 0;
   float val;
 
-  if (timer_elapsed(last_timer) < pgm_read_byte(&RGBLED_BREATHING_INTERVALS[interval])) {
+  uint8_t interval_time = get_interval_time(&RGBLED_RAINBOW_SWIRL_INTERVALS[interval / 2], 1, 100);
+  
+  if (timer_elapsed(last_timer) < interval_time) {
     return;
   }
   last_timer = timer_read();
@@ -798,7 +817,9 @@ void rgblight_effect_rainbow_mood(uint8_t interval) {
   static uint16_t current_hue = 0;
   static uint16_t last_timer = 0;
 
-  if (timer_elapsed(last_timer) < pgm_read_byte(&RGBLED_RAINBOW_MOOD_INTERVALS[interval])) {
+  uint8_t interval_time = get_interval_time(&RGBLED_RAINBOW_MOOD_INTERVALS[interval], 5, 100);
+
+  if (timer_elapsed(last_timer) < interval_time) {
     return;
   }
   last_timer = timer_read();
@@ -820,7 +841,10 @@ void rgblight_effect_rainbow_swirl(uint8_t interval) {
   static uint16_t last_timer = 0;
   uint16_t hue;
   uint8_t i;
-  if (timer_elapsed(last_timer) < pgm_read_byte(&RGBLED_RAINBOW_SWIRL_INTERVALS[interval / 2])) {
+
+  uint8_t interval_time = get_interval_time(&RGBLED_RAINBOW_SWIRL_INTERVALS[interval / 2], 1, 100);
+
+  if (timer_elapsed(last_timer) < interval_time) {
     return;
   }
   last_timer = timer_read();
@@ -855,7 +879,10 @@ void rgblight_effect_snake(uint8_t interval) {
   if (interval % 2) {
     increment = -1;
   }
-  if (timer_elapsed(last_timer) < pgm_read_byte(&RGBLED_SNAKE_INTERVALS[interval / 2])) {
+
+  uint8_t interval_time = get_interval_time(&RGBLED_SNAKE_INTERVALS[interval / 2], 1, 200);
+
+  if (timer_elapsed(last_timer) < interval_time) {
     return;
   }
   last_timer = timer_read();
@@ -892,7 +919,10 @@ const uint8_t RGBLED_KNIGHT_INTERVALS[] PROGMEM = {127, 63, 31};
 
 void rgblight_effect_knight(uint8_t interval) {
   static uint16_t last_timer = 0;
-  if (timer_elapsed(last_timer) < pgm_read_byte(&RGBLED_KNIGHT_INTERVALS[interval])) {
+
+  uint8_t interval_time = get_interval_time(&RGBLED_KNIGHT_INTERVALS[interval], 5, 100);
+
+  if (timer_elapsed(last_timer) < interval_time) {
     return;
   }
   last_timer = timer_read();
diff --git a/quantum/velocikey.c b/quantum/velocikey.c
new file mode 100644
index 0000000000..550c3b70a6
--- /dev/null
+++ b/quantum/velocikey.c
@@ -0,0 +1,46 @@
+#include "velocikey.h"
+#include "timer.h"
+#include "eeconfig.h"
+#include "eeprom.h"
+
+#ifndef MIN
+#define MIN(a,b) (((a)<(b))?(a):(b))
+#endif
+#ifndef MAX
+#define MAX(a,b) (((a)>(b))?(a):(b))
+#endif
+
+#define TYPING_SPEED_MAX_VALUE 200
+uint8_t typing_speed = 0;
+
+bool velocikey_enabled(void) {
+    return eeprom_read_byte(EECONFIG_VELOCIKEY) == 1;
+}
+
+void velocikey_toggle(void) {
+    if (velocikey_enabled()) 
+        eeprom_update_byte(EECONFIG_VELOCIKEY, 0);
+    else 
+        eeprom_update_byte(EECONFIG_VELOCIKEY, 1);
+}
+
+void velocikey_accelerate(void) {
+    if (typing_speed < TYPING_SPEED_MAX_VALUE) typing_speed += (TYPING_SPEED_MAX_VALUE / 100);
+}
+
+void velocikey_decelerate(void) {
+  static uint16_t decay_timer = 0;
+
+  if (timer_elapsed(decay_timer) > 500 || decay_timer == 0) {
+    if (typing_speed > 0) typing_speed -= 1;
+    //Decay a little faster at half of max speed
+    if (typing_speed > TYPING_SPEED_MAX_VALUE / 2) typing_speed -= 1;
+    //Decay even faster at 3/4 of max speed
+    if (typing_speed > TYPING_SPEED_MAX_VALUE / 4 * 3) typing_speed -= 2;
+    decay_timer = timer_read();
+  }
+}
+
+uint8_t velocikey_match_speed(uint8_t minValue, uint8_t maxValue) {
+  return MAX(minValue, maxValue - (maxValue - minValue) * ((float)typing_speed / TYPING_SPEED_MAX_VALUE));
+}
diff --git a/quantum/velocikey.h b/quantum/velocikey.h
new file mode 100644
index 0000000000..1910f0f4e9
--- /dev/null
+++ b/quantum/velocikey.h
@@ -0,0 +1,13 @@
+#ifndef VELOCIKEY_H
+#define VELOCIKEY_H
+
+#include <stdint.h>
+#include <stdbool.h>
+
+bool velocikey_enabled(void);
+void velocikey_toggle(void);
+void velocikey_accelerate(void);
+void velocikey_decelerate(void);
+uint8_t velocikey_match_speed(uint8_t minValue, uint8_t maxValue);
+
+#endif
\ No newline at end of file
diff --git a/tmk_core/common/eeconfig.c b/tmk_core/common/eeconfig.c
index ded27e599f..9c1e3520ee 100644
--- a/tmk_core/common/eeconfig.c
+++ b/tmk_core/common/eeconfig.c
@@ -46,6 +46,7 @@ void eeconfig_init_quantum(void) {
   eeprom_update_dword(EECONFIG_RGBLIGHT,      0);
   eeprom_update_byte(EECONFIG_STENOMODE,      0);
   eeprom_update_dword(EECONFIG_HAPTIC,        0);
+  eeprom_update_byte(EECONFIG_VELOCIKEY,      0);
 
   eeconfig_init_kb();
 }
diff --git a/tmk_core/common/eeconfig.h b/tmk_core/common/eeconfig.h
index d576634f57..0ac3dff079 100644
--- a/tmk_core/common/eeconfig.h
+++ b/tmk_core/common/eeconfig.h
@@ -40,6 +40,7 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #define EECONFIG_HANDEDNESS         			        	(uint8_t *)14
 #define EECONFIG_KEYBOARD                          (uint32_t *)15
 #define EECONFIG_USER                              (uint32_t *)19
+#define EECONFIG_VELOCIKEY                          (uint8_t *)23
 
 #define EECONFIG_HAPTIC                            (uint32_t*)24
 
diff --git a/tmk_core/common/keyboard.c b/tmk_core/common/keyboard.c
index 849d74aa1b..52546866eb 100644
--- a/tmk_core/common/keyboard.c
+++ b/tmk_core/common/keyboard.c
@@ -75,6 +75,9 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #ifdef QWIIC_ENABLE
 #   include "qwiic.h"
 #endif
+#ifdef VELOCIKEY_ENABLE
+  #include "velocikey.h"
+#endif
 
 #ifdef MATRIX_HAS_GHOST
 extern const uint16_t keymaps[][MATRIX_ROWS][MATRIX_COLS];
@@ -336,6 +339,10 @@ MATRIX_LOOP_END:
     midi_task();
 #endif
 
+#ifdef VELOCIKEY_ENABLE
+    if (velocikey_enabled()) { velocikey_decelerate();  }
+#endif
+
     // update LED
     if (led_status != host_keyboard_leds()) {
         led_status = host_keyboard_leds();