rt-thread/bsp/hpmicro/libraries/hpm_sdk/utils/hpm_crc32.c

/*
 * Copyright (c) 2023 HPMicro
 *
 * SPDX-License-Identifier: BSD-3-Clause
 *
 */

#include "hpm_crc32.h"


uint32_t crc32(const uint8_t *buf, uint32_t len)
{
    uint8_t i;
    uint32_t crc = 0xFFFFFFFF;
    while (len--) {
        crc ^= *buf++;
        for (i = 0; i < 8; ++i) {
            if (crc & 1)
                crc = (crc >> 1) ^ 0xEDB88320;
            else
                crc = (crc >> 1);
        }
    }

    return ~crc;
}