diff options
Diffstat (limited to 'tmk_core/common/util.c')
| -rw-r--r-- | tmk_core/common/util.c | 116 | 
1 files changed, 69 insertions, 47 deletions
| diff --git a/tmk_core/common/util.c b/tmk_core/common/util.c index 7e0d542993..f4f018de8d 100644 --- a/tmk_core/common/util.c +++ b/tmk_core/common/util.c @@ -18,84 +18,106 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.  #include "util.h"  // bit population - return number of on-bit -uint8_t bitpop(uint8_t bits) -{ +uint8_t bitpop(uint8_t bits) {      uint8_t c; -    for (c = 0; bits; c++) -        bits &= bits - 1; +    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] -*/ +    /* +        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] +    */  } -uint8_t bitpop16(uint16_t bits) -{ +uint8_t bitpop16(uint16_t bits) {      uint8_t c; -    for (c = 0; bits; c++) -        bits &= bits - 1; +    for (c = 0; bits; c++) bits &= bits - 1;      return c;  } -uint8_t bitpop32(uint32_t bits) -{ +uint8_t bitpop32(uint32_t bits) {      uint8_t c; -    for (c = 0; bits; c++) -        bits &= bits - 1; +    for (c = 0; bits; c++) bits &= bits - 1;      return c;  }  // 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 biton(uint8_t bits) {      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;} +    if (bits >> 4) { +        bits >>= 4; +        n += 4; +    } +    if (bits >> 2) { +        bits >>= 2; +        n += 2; +    } +    if (bits >> 1) { +        bits >>= 1; +        n += 1; +    }      return n;  } -uint8_t biton16(uint16_t bits) -{ +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;} +    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;  } -uint8_t biton32(uint32_t bits) -{ +uint8_t biton32(uint32_t bits) {      uint8_t n = 0; -    if (bits >>16) { bits >>=16; n +=16;} -    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;} +    if (bits >> 16) { +        bits >>= 16; +        n += 16; +    } +    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;  } - - -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; +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); +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); +uint32_t bitrev32(uint32_t bits) { +    bits = (uint32_t)bitrev16(bits & 0x0000ffff) << 16 | bitrev16((bits & 0xffff0000) >> 16);      return bits;  } | 
