mirror of
https://github.com/oliverschmidt/contiki.git
synced 2024-11-17 05:10:54 +00:00
76 lines
2.7 KiB
C
76 lines
2.7 KiB
C
/*
|
|
* Copyright (c) 2005, Swedish Institute of Computer Science
|
|
* All rights reserved.
|
|
*
|
|
* 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 of the Institute 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 INSTITUTE 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 INSTITUTE 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.
|
|
*
|
|
* This file is part of the Contiki operating system.
|
|
*
|
|
*/
|
|
|
|
/** \addtogroup lib
|
|
@{ */
|
|
|
|
/**
|
|
* \defgroup me Table-driven Manchester encoding and decoding
|
|
*
|
|
* Manchester encoding is a bit encoding scheme which translates each
|
|
* bit into two bits: the original bit and the inverted bit.
|
|
*
|
|
* Manchester encoding is used for transmitting ones and zeroes
|
|
* between two computers. The Manchester encoding reduces the receive
|
|
* oscillator drift by making sure that no consecutive ones or zeroes
|
|
* are ever transmitted.
|
|
*
|
|
* The table driven method of Manchester encoding and decoding uses
|
|
* two tables with 256 entries. One table is a direct mapping of an
|
|
* 8-bit byte into a 16-bit Manchester encoding of the byte. The
|
|
* second table is a mapping of a Manchester encoded 8-bit byte to 4
|
|
* decoded bits.
|
|
*
|
|
* @{
|
|
*/
|
|
|
|
/**
|
|
* \file
|
|
* Header file for the table-driven Manchester encoding and decoding
|
|
* \author
|
|
* Adam Dunkels <adam@sics.se>
|
|
*
|
|
*/
|
|
|
|
#ifndef __ME_H__
|
|
#define __ME_H__
|
|
|
|
unsigned char me_valid(unsigned char m);
|
|
unsigned short me_encode(unsigned char c);
|
|
unsigned char me_decode16(unsigned short m);
|
|
unsigned char me_decode8(unsigned char m);
|
|
|
|
#endif /* __ME_H__ */
|
|
|
|
/** @} */
|
|
/** @} */
|