Import of the contiki-2.x development code from the SICS internal CVS server

core/lib/me.h

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+/*
+ * 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.
+ *
+ * @(#)$Id: me.h,v 1.1 2006/06/17 22:41:18 adamdunkels Exp $
+ */
+
+/** \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__ */
+
+/** @} */
+/** @} */