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qmk_firmware/util.c

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C
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2010-10-27 11:51:45 +00:00
#include "util.h"
// bit population
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int bitpop(uint8_t bits)
{
int c;
for (c = 0; bits; c++)
bits &= bits -1;
return c;
}
// most significant on-bit
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int biton(uint8_t bits)
{
int n = 0;
if (bits >> 4) { bits >>= 4; n += 4;}
if (bits >> 2) { bits >>= 2; n += 2;}
if (bits >> 1) { bits >>= 1; n += 1;}
return n;
}