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, 36 insertions, 19 deletions

diff --git a/quantum/split_common/split_util.c b/quantum/split_common/split_util.c
index da870f8775..09a307b8ed 100644
--- a/quantum/split_common/split_util.c
+++ b/quantum/split_common/split_util.c
@@ -11,25 +11,25 @@
 #   include "eeconfig.h"
 #endif
 
+#if defined(RGBLIGHT_ENABLE) && defined(RGBLED_SPLIT)
+#include "rgblight.h"
+#endif
+
 volatile bool isLeftHand = true;
 
 __attribute__((weak))
 bool is_keyboard_left(void) {
-  #ifdef SPLIT_HAND_PIN
+  #if defined(SPLIT_HAND_PIN)
     // Test pin SPLIT_HAND_PIN for High/Low, if low it's right hand
     setPinInput(SPLIT_HAND_PIN);
     return readPin(SPLIT_HAND_PIN);
-  #else
-    #ifdef EE_HANDS
-      return eeprom_read_byte(EECONFIG_HANDEDNESS);
-    #else
-      #ifdef MASTER_RIGHT
-        return !is_keyboard_master();
-      #else
-        return is_keyboard_master();
-      #endif
-    #endif
+  #elif defined(EE_HANDS)
+    return eeprom_read_byte(EECONFIG_HANDEDNESS);
+  #elif defined(MASTER_RIGHT)
+    return !is_keyboard_master();
   #endif
+
+  return is_keyboard_master();
 }
 
 bool is_keyboard_master(void)
@@ -71,6 +71,16 @@ void matrix_setup(void)
 {
   isLeftHand = is_keyboard_left();
 
+#if defined(RGBLIGHT_ENABLE) && defined(RGBLED_SPLIT)
+  uint8_t num_rgb_leds_split[2] = RGBLED_SPLIT;
+  if (isLeftHand) {
+    rgblight_set_clipping_range(0, num_rgb_leds_split[0]);
+  }
+  else {
+    rgblight_set_clipping_range(num_rgb_leds_split[0], num_rgb_leds_split[1]);
+  }
+#endif
+
   if (is_keyboard_master())
   {
     keyboard_master_setup();
diff --git a/quantum/split_common/transport.c b/quantum/split_common/transport.c
index 631d913f70..8d408f6fdc 100644
--- a/quantum/split_common/transport.c
+++ b/quantum/split_common/transport.c
@@ -92,12 +92,13 @@ typedef struct _Serial_m2s_buffer_t {
 #  ifdef BACKLIGHT_ENABLE
   uint8_t           backlight_level;
 #  endif
-#  if defined(RGBLIGHT_ENABLE) && defined(RGBLIGHT_SPLIT)
+#  if defined(RGBLIGHT_ENABLE) && defined(RGBLED_SPLIT)
   rgblight_config_t rgblight_config;  // not yet use
   //
   // When MCUs on both sides drive their respective RGB LED chains,
   // it is necessary to synchronize, so it is necessary to communicate RGB
-  // information. In that case, define the RGBLIGHT_SPLIT macro.
+  // information. In that case, define RGBLED_SPLIT with info on the number
+  // of LEDs on each half.
   //
   // Otherwise, if the master side MCU drives both sides RGB LED chains,
   // there is no need to communicate.
@@ -132,15 +133,20 @@ bool transport_master(matrix_row_t matrix[]) {
     matrix[i] = serial_s2m_buffer.smatrix[i];
   }
 
-#  if defined(RGBLIGHT_ENABLE) && defined(RGBLIGHT_SPLIT)
-  // Code to send RGB over serial goes here (not implemented yet)
-#  endif
-
 #  ifdef BACKLIGHT_ENABLE
   // Write backlight level for slave to read
   serial_m2s_buffer.backlight_level = backlight_config.enable ? backlight_config.level : 0;
 #  endif
 
+#  if defined(RGBLIGHT_ENABLE) && defined(RGBLED_SPLIT)
+  static rgblight_config_t prev_rgb = {~0};
+  uint32_t rgb = rgblight_read_dword();
+  if (rgb != prev_rgb.raw) {
+    serial_m2s_buffer.rgblight_config.raw = rgb;
+    prev_rgb.raw = rgb;
+  }
+#  endif
+
   return true;
 }
 
@@ -152,8 +158,9 @@ void transport_slave(matrix_row_t matrix[]) {
 #  ifdef BACKLIGHT_ENABLE
   backlight_set(serial_m2s_buffer.backlight_level);
 #  endif
-#  if defined(RGBLIGHT_ENABLE) && defined(RGBLIGHT_SPLIT)
-// Add serial implementation for RGB here
+#  if defined(RGBLIGHT_ENABLE) && defined(RGBLED_SPLIT)
+  // Update RGB config with the new data
+  rgblight_update_dword(serial_m2s_buffer.rgblight_config.raw);
 #  endif
 }