88 lines
2.2 KiB
C
88 lines
2.2 KiB
C
// Copyright 2015-2016 Espressif Systems (Shanghai) PTE LTD
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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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 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 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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* @}
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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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