Add support for RGB LEDs wired directly to each half's controller (#5392)

* Add support for wiring RGB LEDs for both halves directly to their respective controllers

RGB LEDs for each half don't need to be chained together across the TRRS cable with this

* Add split RGB LED support for serial

* Update config/rules for bakingpy layout

* Un-nest ifdefs for hand detection

* Read RGB config state from memory instead of EEPROM for serial updates

* Reuse existing LED pointer instead of creating new one

2 files changed, 14 insertions, 6 deletions

diff --git a/docs/config_options.md b/docs/config_options.md
index a8a106459..ad42e9780 100644
--- a/docs/config_options.md
+++ b/docs/config_options.md
@@ -171,11 +171,15 @@ If you define these options you will enable the associated feature, which may in
 ## RGB Light Configuration
 
 * `#define RGB_DI_PIN D7`
-  * pin the DI on the ws2812 is hooked-up to
+  * pin the DI on the WS2812 is hooked-up to
 * `#define RGBLIGHT_ANIMATIONS`
   * run RGB animations
-* `#define RGBLED_NUM 15`
+* `#define RGBLED_NUM 12`
   * number of LEDs
+* `#define RGBLED_SPLIT { 6, 6 }`
+  * number of LEDs connected that are directly wired to `RGB_DI_PIN` on each half of a split keyboard
+  * First value indicates number of LEDs for left half, second value is for the right half
+  * Needed if both halves of the board have RGB LEDs wired directly to the RGB output pin on the controllers instead of passing the output of the left half to the input of the right half
 * `#define RGBLIGHT_HUE_STEP 12`
   * units to step when in/decreasing hue
 * `#define RGBLIGHT_SAT_STEP 25`
@@ -236,6 +240,9 @@ There are a few different ways to set handedness for split keyboards (listed in
 * `#define MATRIX_COL_PINS_RIGHT { <col pins> }`
   * If you want to specify a different pinout for the right half than the left half, you can define `MATRIX_ROW_PINS_RIGHT`/`MATRIX_COL_PINS_RIGHT`. Currently, the size of `MATRIX_ROW_PINS` must be the same as `MATRIX_ROW_PINS_RIGHT` and likewise for the definition of columns.
 
+* `#define RGBLED_SPLIT { 6, 6 }`
+  * See [RGB Light Configuration](#rgb-light-configuration)
+
 * `#define SELECT_SOFT_SERIAL_SPEED <speed>` (default speed is 1)
   * Sets the protocol speed when using serial communication
   * Speeds:
diff --git a/docs/feature_rgblight.md b/docs/feature_rgblight.md
index 800e59738..9ecc0deb5 100644
--- a/docs/feature_rgblight.md
+++ b/docs/feature_rgblight.md
@@ -23,10 +23,11 @@ RGBLIGHT_ENABLE = yes
 
 At minimum you must define the data pin your LED strip is connected to, and the number of LEDs in the strip, in your `config.h`. If your keyboard has onboard RGB LEDs, and you are simply creating a keymap, you usually won't need to modify these.
 
-|Define      |Description                                  |
-|------------|---------------------------------------------|
-|`RGB_DI_PIN`|The pin connected to the data pin of the LEDs|
-|`RGBLED_NUM`|The number of LEDs connected                 |
+|Define         |Description                                                                                              |
+|---------------|---------------------------------------------------------------------------------------------------------|
+|`RGB_DI_PIN`   |The pin connected to the data pin of the LEDs                                                            |
+|`RGBLED_NUM`   |The number of LEDs connected                                                                             |
+|`RGBLED_SPLIT` |(Optional) For split keyboards, the number of LEDs connected on each half directly wired to `RGB_DI_PIN` |
 
 Then you should be able to use the keycodes below to change the RGB lighting to your liking.