27 lines
559 B
C
27 lines
559 B
C
/*
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* Copyright (c) 2017 Nordic Semiconductor ASA
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* Copyright (c) 2015 Runtime Inc
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include <crc.h>
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static const u8_t crc8_ccitt_small_table[16] = {
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0x00, 0x07, 0x0e, 0x09, 0x1c, 0x1b, 0x12, 0x15,
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0x38, 0x3f, 0x36, 0x31, 0x24, 0x23, 0x2a, 0x2d
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};
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u8_t crc8_ccitt(u8_t val, const void *buf, size_t cnt)
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{
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int i;
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const u8_t *p = buf;
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for (i = 0; i < cnt; i++) {
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val ^= p[i];
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val = (val << 4) ^ crc8_ccitt_small_table[val >> 4];
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val = (val << 4) ^ crc8_ccitt_small_table[val >> 4];
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}
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return val;
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}
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