You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
59 lines
1.6 KiB
59 lines
1.6 KiB
/* |
|
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 3 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/>. |
|
*/ |
|
/* |
|
collection of bitwise and array-wise operations. |
|
*/ |
|
|
|
|
|
#include "bitwise.h" |
|
|
|
void loadUint(uint8_t *b, uint16_t v, uint8_t bitCount, bool MSBfirst) |
|
{ |
|
const uint8_t last = bitCount/8; |
|
|
|
// count = 32 |
|
// last = 4 |
|
// MSBfirst = 1; |
|
|
|
for (uint8_t i=0; i<last; i++) { |
|
const uint8_t idx = MSBfirst ? last-1-i : i; |
|
// idx = 4-1-0 |
|
b[i] = v >> (8*idx); |
|
} |
|
} |
|
|
|
uint16_t fetchU16(const uint8_t *v, bool MSBfirst) |
|
{ |
|
if (MSBfirst) { |
|
return v[1] | (v[0]<<8); |
|
} |
|
return v[0] | (v[1]<<8); |
|
} |
|
|
|
uint32_t fetchU24(const uint8_t *v, bool MSBfirst) |
|
{ |
|
if (MSBfirst) { |
|
return v[2] | (v[1]<<8) | (v[0]<<16); |
|
} |
|
return v[0] | (v[1]<<8) | (v[2]<<16); |
|
} |
|
|
|
uint32_t fetchU32(const uint8_t *v, bool MSBfirst) |
|
{ |
|
if (MSBfirst) { |
|
return v[3] | (v[2]<<8) | (v[1]<<16) | (v[0]<<24); |
|
} |
|
return v[0] | (v[1]<<8) | (v[2]<<16) | (v[3]<<24); |
|
}
|
|
|