kopia lustrzana https://github.com/espressif/esp-idf
120 wiersze
2.7 KiB
C
120 wiersze
2.7 KiB
C
/*
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* SPDX-FileCopyrightText: 2022 Espressif Systems (Shanghai) CO LTD
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#ifndef ROM_CRC_H
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#define ROM_CRC_H
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#include <stdint.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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/** \defgroup crc_apis, uart configuration and communication related apis
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* @brief crc apis
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*/
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/** @addtogroup crc_apis
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* @{
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*/
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/* Standard CRC8/16/32 algorithms. */
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// CRC-8 x8+x2+x1+1 0x07
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// CRC16-CCITT x16+x12+x5+1 1021 ISO HDLC, ITU X.25, V.34/V.41/V.42, PPP-FCS
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// CRC32:
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//G(x) = x32 +x26 + x23 + x22 + x16 + x12 + x11 + x10 + x8 + x7 + x5 + x4 + x2 + x1 + 1
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//If your buf is not continuous, you can use the first result to be the second parameter.
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/**
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* @brief Crc32 value that is in little endian.
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*
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* @param uint32_t crc : init crc value, use 0 at the first use.
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*
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* @param uint8_t const *buf : buffer to start calculate crc.
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*
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* @param uint32_t len : buffer length in byte.
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*
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* @return None
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*/
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uint32_t crc32_le(uint32_t crc, uint8_t const *buf, uint32_t len);
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/**
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* @brief Crc32 value that is in big endian.
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*
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* @param uint32_t crc : init crc value, use 0 at the first use.
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*
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* @param uint8_t const *buf : buffer to start calculate crc.
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*
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* @param uint32_t len : buffer length in byte.
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*
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* @return None
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*/
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uint32_t crc32_be(uint32_t crc, uint8_t const *buf, uint32_t len);
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/**
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* @brief Crc16 value that is in little endian.
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*
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* @param uint16_t crc : init crc value, use 0 at the first use.
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*
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* @param uint8_t const *buf : buffer to start calculate crc.
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*
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* @param uint32_t len : buffer length in byte.
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*
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* @return None
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*/
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uint16_t crc16_le(uint16_t crc, uint8_t const *buf, uint32_t len);
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/**
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* @brief Crc16 value that is in big endian.
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*
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* @param uint16_t crc : init crc value, use 0 at the first use.
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*
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* @param uint8_t const *buf : buffer to start calculate crc.
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*
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* @param uint32_t len : buffer length in byte.
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*
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* @return None
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*/
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uint16_t crc16_be(uint16_t crc, uint8_t const *buf, uint32_t len);
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/**
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* @brief Crc8 value that is in little endian.
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*
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* @param uint8_t crc : init crc value, use 0 at the first use.
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*
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* @param uint8_t const *buf : buffer to start calculate crc.
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*
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* @param uint32_t len : buffer length in byte.
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*
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* @return None
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*/
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uint8_t crc8_le(uint8_t crc, uint8_t const *buf, uint32_t len);
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/**
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* @brief Crc8 value that is in big endian.
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*
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* @param uint32_t crc : init crc value, use 0 at the first use.
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*
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* @param uint8_t const *buf : buffer to start calculate crc.
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*
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* @param uint32_t len : buffer length in byte.
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*
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* @return None
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*/
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uint8_t crc8_be(uint8_t crc, uint8_t const *buf, uint32_t len);
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/**
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* @}
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*/
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#ifdef __cplusplus
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}
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#endif
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#endif
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