X-Git-Url: https://git.donarmstrong.com/?a=blobdiff_plain;f=common%2Futil.c;h=7e0d542993a955be815c2dbb495793f40ed68dd1;hb=1f96edaed60def1f513ddd8adcdfa3e12b971006;hp=6d4d6bfda1801550c68e3d04c8a37d214a45f8c5;hpb=a8c465215fce3dad502da868ca49eb446deadc4e;p=tmk_firmware.git

diff --git a/common/util.c b/common/util.c
index 6d4d6bf..7e0d542 100644
--- a/common/util.c
+++ b/common/util.c
@@ -77,3 +77,25 @@ uint8_t biton32(uint32_t bits)
     if (bits >> 1) { bits >>= 1; n += 1;}
     return n;
 }
+
+
+
+uint8_t bitrev(uint8_t bits)
+{
+    bits = (bits & 0x0f)<<4 | (bits & 0xf0)>>4;
+    bits = (bits & 0b00110011)<<2 | (bits & 0b11001100)>>2;
+    bits = (bits & 0b01010101)<<1 | (bits & 0b10101010)>>1;
+    return bits;
+}
+
+uint16_t bitrev16(uint16_t bits)
+{
+    bits = bitrev(bits & 0x00ff)<<8 | bitrev((bits & 0xff00)>>8);
+    return bits;
+}
+
+uint32_t bitrev32(uint32_t bits)
+{
+    bits = (uint32_t)bitrev16(bits & 0x0000ffff)<<16 | bitrev16((bits & 0xffff0000)>>16);
+    return bits;
+}