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Initial version of new code for layer switch is added.

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tmk 2012-10-06 02:23:12 +09:00
parent 93e33fb8f6
commit 4ae979f6ef
19 changed files with 592 additions and 495 deletions
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16
common/util.c
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@ -17,19 +17,23 @@ along with this program. If not, see <http://www.gnu.org/licenses/>.
#include "util.h"
// bit population
int bitpop(uint8_t bits)
// bit population - return number of on-bit
uint8_t bitpop(uint8_t bits)
{
int c;
uint8_t c;
for (c = 0; bits; c++)
bits &= bits -1;
return c;
/*
const uint8_t bit_count[] = { 0, 1, 1, 2, 1, 2, 2, 3, 1, 2, 2, 3, 2, 3, 3, 4 };
return bit_count[bits>>4] + bit_count[bits&0x0F]
*/
}
// most significant on-bit
int biton(uint8_t bits)
// most significant on-bit - return highest location of on-bit
uint8_t biton(uint8_t bits)
{
int n = 0;
uint8_t n = 0;
if (bits >> 4) { bits >>= 4; n += 4;}
if (bits >> 2) { bits >>= 2; n += 2;}
if (bits >> 1) { bits >>= 1; n += 1;}