1 files changed, 14 insertions, 2 deletions

diff --git a/quantum/quantum.h b/quantum/quantum.h
index 7dc14e628..d03ba5942 100644
--- a/quantum/quantum.h
+++ b/quantum/quantum.h
@@ -211,9 +211,21 @@ typedef ioline_t pin_t;
 #define SEND_STRING(string) send_string_P(PSTR(string))
 #define SEND_STRING_DELAY(string, interval) send_string_with_delay_P(PSTR(string), interval)
 
-extern const bool    ascii_to_shift_lut[128];
-extern const bool    ascii_to_altgr_lut[128];
+// Look-Up Tables (LUTs) to convert ASCII character to keycode sequence.
 extern const uint8_t ascii_to_keycode_lut[128];
+extern const uint8_t ascii_to_shift_lut[16];
+extern const uint8_t ascii_to_altgr_lut[16];
+// clang-format off
+#define KCLUT_ENTRY(a, b, c, d, e, f, g, h) \
+    ( ((a) ? 1 : 0) << 0 \
+    | ((b) ? 1 : 0) << 1 \
+    | ((c) ? 1 : 0) << 2 \
+    | ((d) ? 1 : 0) << 3 \
+    | ((e) ? 1 : 0) << 4 \
+    | ((f) ? 1 : 0) << 5 \
+    | ((g) ? 1 : 0) << 6 \
+    | ((h) ? 1 : 0) << 7 )
+// clang-format on
 
 void send_string(const char *str);
 void send_string_with_delay(const char *str, uint8_t interval);