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Move crc16 function to libs

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This commit is contained in:
Scott Lahteine
2019-06-11 07:41:54 -05:00
parent 2a96d4e23a
commit 356410dcfc
8 changed files with 69 additions and 38 deletions
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32
Marlin/src/libs/crc16.cpp Normal file
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/**
* 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/>.
*
*/
#include "crc16.h"
void crc16(uint16_t *crc, const void * const data, uint16_t cnt) {
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));
}
}

26
Marlin/src/libs/crc16.h Normal file
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/**
* 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/>.
*
*/
#pragma once
#include <stdint.h>
void crc16(uint16_t *crc, const void * const data, uint16_t cnt);