AceCRC  1.1.0
Cyclic Redundancy Check (CRC) algorithms (e.g. crc16ccitt, crc32) programmatically converted from C99 code generated by pycrc (https://pycrc.org) to Arduino C++ using namespaces and PROGMEM flash memory.
crc16ccitt_bit.cpp
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1 
20 #include "crc16ccitt_bit.hpp" // header file converted by AceCRC
21 #include <stdlib.h>
22 #include <stdint.h>
23 #include <stdbool.h>
24 
25 namespace ace_crc {
26 namespace crc16ccitt_bit {
27 
28 
29 
30 crc_t crc_update(crc_t crc, const void *data, size_t data_len)
31 {
32  const unsigned char *d = (const unsigned char *)data;
33  uint8_t i;
34  crc_t bit;
35  unsigned char c;
36 
37  while (data_len--) {
38  c = *d++;
39  for (i = 0x80; i > 0; i >>= 1) {
40  bit = (crc & 0x8000) ^ ((c & i) ? 0x8000 : 0);
41  crc <<= 1;
42  if (bit) {
43  crc ^= 0x1021;
44  }
45  }
46  crc &= 0xffff;
47  }
48  return crc & 0xffff;
49 }
50 
51 } // crc16ccitt_bit
52 } // ace_crc
crc_t crc_update(crc_t crc, const void *data, size_t data_len)
Update the crc value with new data.
Functions and types for CRC checks.
uint16_t crc_t
The type of the CRC values.