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author | Matt Johnston <matt@ucc.asn.au> |
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date | Thu, 26 Jun 2014 21:44:16 +0800 |
parents | 95043860e437 |
children |
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/* please read copyright-notice at EOF */ #include <stdint.h> #define CRC8INIT 0x00 #define CRC8POLY 0x18 //0X18 = X^8+X^5+X^4+X^0 uint8_t crc8( uint8_t *data, uint16_t number_of_bytes_in_data ) { uint8_t crc; uint16_t loop_count; uint8_t bit_counter; uint8_t b; uint8_t feedback_bit; crc = CRC8INIT; for (loop_count = 0; loop_count != number_of_bytes_in_data; loop_count++) { b = data[loop_count]; bit_counter = 8; do { feedback_bit = (crc ^ b) & 0x01; if ( feedback_bit == 0x01 ) { crc = crc ^ CRC8POLY; } crc = (crc >> 1) & 0x7F; if ( feedback_bit == 0x01 ) { crc = crc | 0x80; } b = b >> 1; bit_counter--; } while (bit_counter > 0); } return crc; } /* This code is from Colin O'Flynn - Copyright (c) 2002 only minor changes by M.Thomas 9/2004 Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */