OpenModem/util/CRC-CCIT.h
2018-03-28 22:17:53 +02:00

18 lines
396 B
C
Executable File

// CRC-CCIT Implementation based on work by Francesco Sacchi
#ifndef CRC_CCIT_H
#define CRC_CCIT_H
#include <stdint.h>
#include <avr/pgmspace.h>
#define CRC_CCIT_INIT_VAL ((uint16_t)0xFFFF)
extern const uint16_t crc_ccit_table[256];
inline uint16_t update_crc_ccit(uint8_t c, uint16_t prev_crc) {
return (prev_crc >> 8) ^ pgm_read_word(&crc_ccit_table[(prev_crc ^ c) & 0xff]);
}
#endif