From 246ab986d67e177bb4e60046ad486947e1624774 Mon Sep 17 00:00:00 2001 From: Gregory Nutt Date: Tue, 9 Dec 2014 13:27:22 -0600 Subject: Add CRC8 support. From Ken Pettit --- nuttx/include/crc8.h | 84 ++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 84 insertions(+) create mode 100644 nuttx/include/crc8.h (limited to 'nuttx/include') diff --git a/nuttx/include/crc8.h b/nuttx/include/crc8.h new file mode 100644 index 000000000..df8434972 --- /dev/null +++ b/nuttx/include/crc8.h @@ -0,0 +1,84 @@ +/**************************************************************************** + * include/crc8.h + * + * Copyright (C) 2014 Ken Pettit. All rights reserved. + * Author: Ken Pettit + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * 3. Neither the name NuttX nor the names of its contributors may be + * used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS + * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE + * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, + * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS + * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED + * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN + * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. + * + ****************************************************************************/ + +#ifndef __INCLUDE_CRC8_H +#define __INCLUDE_CRC8_H + +/**************************************************************************** + * Included Files + ****************************************************************************/ + +#include +#include + +/**************************************************************************** + * Public Function Prototypes + ****************************************************************************/ + +#ifdef __cplusplus +#define EXTERN extern "C" +extern "C" +{ +#else +#define EXTERN extern +#endif + +/**************************************************************************** + * Name: crc8part + * + * Description: + * Continue CRC calculation on a part of the buffer. + * + ****************************************************************************/ + +uint8_t crc8part(FAR const uint8_t *src, size_t len, uint8_t crc8val); + +/**************************************************************************** + * Name: crc8 + * + * Description: + * Return an 8-bit CRC of the contents of the 'src' buffer, length 'len' + * using the polynomial x^8+x^6+x^3+x^2+1 (Koopman, et al. "0xA6" poly). + * + ****************************************************************************/ + +uint8_t crc8(FAR const uint8_t *src, size_t len); + +#undef EXTERN +#ifdef __cplusplus +} +#endif + +#endif /* __INCLUDE_CRC8_H */ -- cgit v1.2.3