Allow expanding from 8 to 32 RGB Lighting Layers (#8941)

* Allow 16 lighting layers

* Require #define RGBLIGHT_LAYERS_16 to enable 16 layers

* Override RGBLIGHT_MAX_LAYERS to set maximum number of lighting layers

* Enforce lower bound on RGBLIGHT_MAX_LAYERS

Co-Authored-By: Takeshi ISHII <2170248+mtei@users.noreply.github.com>

* Fix an error in the check for valid RGBLIGHT_MAX_LAYERS

* Don't use bitfield / PACKED, as it causes bloat

* Update documentation re: up to 32 lighting layers

* Run cformat

* Add note about increasing FW size in docs/config_options.md

Co-authored-by: Drashna Jaelre <drashna@live.com>

* Remove no-longer-valid comment

* Add doc note that split sync will be slower

Co-authored-by: Takeshi ISHII <2170248+mtei@users.noreply.github.com>
Co-authored-by: Drashna Jaelre <drashna@live.com>

1 files changed, 15 insertions, 2 deletions

diff --git a/quantum/rgblight.h b/quantum/rgblight.h
index f93a30c5a..6fc3b6f17 100644
--- a/quantum/rgblight.h
+++ b/quantum/rgblight.h
@@ -196,7 +196,20 @@ typedef struct {
 #        define RGBLIGHT_END_SEGMENT_INDEX (255)
 #        define RGBLIGHT_END_SEGMENTS \
             { RGBLIGHT_END_SEGMENT_INDEX, 0, 0, 0 }
-#        define RGBLIGHT_MAX_LAYERS 8
+#        ifndef RGBLIGHT_MAX_LAYERS
+#            define RGBLIGHT_MAX_LAYERS 8
+#        endif
+#        if RGBLIGHT_MAX_LAYERS <= 0
+#            error invalid RGBLIGHT_MAX_LAYERS value (must be >= 1)
+#        elif RGBLIGHT_MAX_LAYERS <= 8
+typedef uint8_t rgblight_layer_mask_t;
+#        elif RGBLIGHT_MAX_LAYERS <= 16
+typedef uint16_t rgblight_layer_mask_t;
+#        elif RGBLIGHT_MAX_LAYERS <= 32
+typedef uint32_t rgblight_layer_mask_t;
+#        else
+#            error invalid RGBLIGHT_MAX_LAYERS value (must be <= 32)
+#        endif
 #        define RGBLIGHT_LAYER_SEGMENTS(...) \
             { __VA_ARGS__, RGBLIGHT_END_SEGMENTS }
 #        define RGBLIGHT_LAYERS_LIST(...) \
@@ -247,7 +260,7 @@ typedef struct _rgblight_status_t {
     uint8_t change_flags;
 #    endif
 #    ifdef RGBLIGHT_LAYERS
-    uint8_t enabled_layer_mask;
+    rgblight_layer_mask_t enabled_layer_mask;
 #    endif
 } rgblight_status_t;