mirror of
https://github.com/DarkFlippers/unleashed-firmware
synced 2024-11-24 05:23:06 +00:00
389ff92cc1
* Makefile, Scripts: new linter * About: remove ID from IC * Firmware: remove double define for DIVC/DIVR * Scripts: check folder names too. Docker: replace syntax check with make lint. * Reformat Sources and Migrate to new file naming convention * Docker: symlink clang-format-12 to clang-format * Add coding style guide
82 lines
2.5 KiB
C
82 lines
2.5 KiB
C
|
|
/******************************************************************************
|
|
* \attention
|
|
*
|
|
* <h2><center>© COPYRIGHT 2020 STMicroelectronics</center></h2>
|
|
*
|
|
* Licensed under ST MYLIBERTY SOFTWARE LICENSE AGREEMENT (the "License");
|
|
* You may not use this file except in compliance with the License.
|
|
* You may obtain a copy of the License at:
|
|
*
|
|
* www.st.com/myliberty
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied,
|
|
* AND SPECIFICALLY DISCLAIMING THE IMPLIED WARRANTIES OF MERCHANTABILITY,
|
|
* FITNESS FOR A PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
|
|
* See the License for the specific language governing permissions and
|
|
* limitations under the License.
|
|
*
|
|
******************************************************************************/
|
|
|
|
/*
|
|
* PROJECT: ST25R391x firmware
|
|
* Revision:
|
|
* LANGUAGE: ISO C99
|
|
*/
|
|
|
|
/*! \file rfal_crc.c
|
|
*
|
|
* \author Oliver Regenfelder
|
|
*
|
|
* \brief CRC calculation implementation
|
|
*
|
|
*/
|
|
|
|
/*
|
|
******************************************************************************
|
|
* INCLUDES
|
|
******************************************************************************
|
|
*/
|
|
#include "rfal_crc.h"
|
|
|
|
/*
|
|
******************************************************************************
|
|
* LOCAL FUNCTION PROTOTYPES
|
|
******************************************************************************
|
|
*/
|
|
static uint16_t rfalCrcUpdateCcitt(uint16_t crcSeed, uint8_t dataByte);
|
|
|
|
/*
|
|
******************************************************************************
|
|
* GLOBAL FUNCTIONS
|
|
******************************************************************************
|
|
*/
|
|
uint16_t rfalCrcCalculateCcitt(uint16_t preloadValue, const uint8_t* buf, uint16_t length) {
|
|
uint16_t crc = preloadValue;
|
|
uint16_t index;
|
|
|
|
for(index = 0; index < length; index++) {
|
|
crc = rfalCrcUpdateCcitt(crc, buf[index]);
|
|
}
|
|
|
|
return crc;
|
|
}
|
|
|
|
/*
|
|
******************************************************************************
|
|
* LOCAL FUNCTIONS
|
|
******************************************************************************
|
|
*/
|
|
static uint16_t rfalCrcUpdateCcitt(uint16_t crcSeed, uint8_t dataByte) {
|
|
uint16_t crc = crcSeed;
|
|
uint8_t dat = dataByte;
|
|
|
|
dat ^= (uint8_t)(crc & 0xFFU);
|
|
dat ^= (dat << 4);
|
|
|
|
crc = (crc >> 8) ^ (((uint16_t)dat) << 8) ^ (((uint16_t)dat) << 3) ^ (((uint16_t)dat) >> 4);
|
|
|
|
return crc;
|
|
}
|