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author | QMK Bot <hello@qmk.fm> | 2021-02-07 23:16:47 +0000 |
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committer | QMK Bot <hello@qmk.fm> | 2021-02-07 23:16:47 +0000 |
commit | 3a98bd75c88c5cc64aed72b9d2e3a8857d949fed (patch) | |
tree | 7edcbbfa0c0efd16e456d6012f90833922d3bb3c /tmk_core/common/util.c | |
parent | b8031a1613290ada50f4cb746216fcae90d8935d (diff) | |
parent | 99bffc2a21ebed07fd767ad2a9a7e1aadd491ef3 (diff) |
Merge remote-tracking branch 'origin/master' into develop
Diffstat (limited to 'tmk_core/common/util.c')
-rw-r--r-- | tmk_core/common/util.c | 123 |
1 files changed, 0 insertions, 123 deletions
diff --git a/tmk_core/common/util.c b/tmk_core/common/util.c deleted file mode 100644 index 861cca0054..0000000000 --- a/tmk_core/common/util.c +++ /dev/null @@ -1,123 +0,0 @@ -/* -Copyright 2011 Jun Wako <wakojun@gmail.com> - -This program is free software: you can redistribute it and/or modify -it under the terms of the GNU General Public License as published by -the Free Software Foundation, either version 2 of the License, or -(at your option) any later version. - -This program is distributed in the hope that it will be useful, -but WITHOUT ANY WARRANTY; without even the implied warranty of -MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -GNU General Public License for more details. - -You should have received a copy of the GNU General Public License -along with this program. If not, see <http://www.gnu.org/licenses/>. -*/ - -#include "util.h" - -// bit population - return number of on-bit -__attribute__((noinline)) uint8_t bitpop(uint8_t bits) { - 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] - */ -} - -uint8_t bitpop16(uint16_t bits) { - uint8_t c; - for (c = 0; bits; c++) bits &= bits - 1; - return c; -} - -uint8_t bitpop32(uint32_t bits) { - uint8_t c; - 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 -__attribute__((noinline)) 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; - } - 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; -} - -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; - } - return n; -} - -__attribute__((noinline)) 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; -} |