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76 lines
2.7 KiB
C
76 lines
2.7 KiB
C
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/*
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* Copyright (c) 2005, Swedish Institute of Computer Science
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* This file is part of the Contiki operating system.
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*
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*/
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/** \addtogroup lib
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@{ */
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/**
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* \defgroup me Table-driven Manchester encoding and decoding
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*
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* Manchester encoding is a bit encoding scheme which translates each
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* bit into two bits: the original bit and the inverted bit.
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*
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* Manchester encoding is used for transmitting ones and zeroes
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* between two computers. The Manchester encoding reduces the receive
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* oscillator drift by making sure that no consecutive ones or zeroes
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* are ever transmitted.
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*
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* The table driven method of Manchester encoding and decoding uses
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* two tables with 256 entries. One table is a direct mapping of an
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* 8-bit byte into a 16-bit Manchester encoding of the byte. The
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* second table is a mapping of a Manchester encoded 8-bit byte to 4
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* decoded bits.
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*
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* @{
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*/
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/**
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* \file
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* Header file for the table-driven Manchester encoding and decoding
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* \author
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* Adam Dunkels <adam@sics.se>
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*
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*/
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#ifndef __ME_H__
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#define __ME_H__
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unsigned char me_valid(unsigned char m);
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unsigned short me_encode(unsigned char c);
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unsigned char me_decode16(unsigned short m);
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unsigned char me_decode8(unsigned char m);
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#endif /* __ME_H__ */
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/** @} */
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/** @} */
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