crc16.h File Reference

#include <stdint.h>

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Functions
void	crc16 (uint16_t *crc, const void *const data, uint16_t cnt)

Function Documentation

crc16()

void crc16	(	uint16_t *	crc,
		const void *const	data,
		uint16_t	cnt
	)

Marlin 3D Printer Firmware Copyright (c) 2019 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]

Based on Sprinter and grbl. Copyright (c) 2011 Camiel Gubbels / Erik van der Zalm

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/.

                                                                 {
  uint8_t *ptr = (uint8_t *)data;
  while (cnt--) {
    *crc = (uint16_t)(*crc ^ (uint16_t)(((uint16_t)*ptr++) << 8));
    for (uint8_t i = 0; i < 8; i++)
      *crc = (uint16_t)((*crc & 0x8000) ? ((uint16_t)(*crc << 1) ^ 0x1021) : (*crc << 1));
  }
}