X-Git-Url: https://git.friedersdorff.com/?a=blobdiff_plain;f=common%2Futil.c;h=ff1926d7d14e0c58cb35249ebd5f03b430b7cfbf;hb=de8ef18a534163b40e307418b3af603142d5d6b0;hp=9d8fb93219d97d725ec19410033b5cd86647c348;hpb=8c80deb775ac151001dc1592a2e94e8677b49964;p=max%2Ftmk_keyboard.git

diff --git a/common/util.c b/common/util.c
index 9d8fb932..ff1926d7 100644
--- a/common/util.c
+++ b/common/util.c
@@ -39,6 +39,7 @@ uint8_t bitpop16(uint16_t bits)
 }
 
 // most significant on-bit - return highest location of on-bit
+// NOTE: return 0 when bit0 is on or all bits are off
 uint8_t biton(uint8_t bits)
 {
     uint8_t n = 0;
@@ -47,3 +48,13 @@ uint8_t biton(uint8_t bits)
     if (bits >> 1) { bits >>= 1; n += 1;}
     return n;
 }
+
+uint8_t biton16(uint16_t bits)
+{
+    uint8_t n = 0;
+    if (bits >> 8) { bits >>= 8; n += 8;}
+    if (bits >> 4) { bits >>= 4; n += 4;}
+    if (bits >> 2) { bits >>= 2; n += 2;}
+    if (bits >> 1) { bits >>= 1; n += 1;}
+    return n;
+}