/*									tab:4
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/*									tab:4
 *  IMPORTANT: READ BEFORE DOWNLOADING, COPYING, INSTALLING OR USING.  By
 *  downloading, copying, installing or using the software you agree to
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 *  install, copy or use the software.
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 *  Intel Open Source License 
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 *  Copyright (c) 2002 Intel Corporation 
 *  All rights reserved. 
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 *  modification, are permitted provided that the following conditions are
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 *      Neither the name of the Intel Corporation nor the names of its
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 *  this software without specific prior written permission.
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 *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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 *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 * 
 * 
 */
/*
 *
 * Authors:		Jason Hill, David Gay, Philip Levis
 * Date last modified:  6/25/02
 *
 */

// Message format

enum {
  TOS_BCAST_ADDR = 0xffff,
  TOS_UART_ADDR = 0x007e,
};

#ifndef DEF_TOS_AM_GROUP
#define DEF_TOS_AM_GROUP 0x7d
#endif

enum {
  TOS_DEFAULT_AM_GROUP = DEF_TOS_AM_GROUP
};

uint8_t TOS_AM_GROUP = TOS_DEFAULT_AM_GROUP;

#ifndef TOSH_DATA_LENGTH
#define TOSH_DATA_LENGTH 29
#endif

typedef struct TOS_Msg
{
  /* The following fields are transmitted/received on the radio. */
  uint16_t addr;
  uint8_t type;
  uint8_t group;
  uint8_t length;
  int8_t data[TOSH_DATA_LENGTH];
  uint16_t crc;

  /* The following fields are not actually transmitted or received 
   * on the radio! They are used for internal accounting only.
   * The reason they are in this structure is that the AM interface
   * requires them to be part of the TOS_Msg that is passed to
   * send/receive operations.
   */
  uint16_t strength;
  uint8_t ack;
  uint16_t time;
  uint16_t toneTime;
} TOS_Msg;

enum {
  MSG_DATA_SIZE = offsetof(struct TOS_Msg, crc) + sizeof(uint16_t), // 36 by default
  DATA_LENGTH = TOSH_DATA_LENGTH,
  LENGTH_BYTE_NUMBER = offsetof(struct TOS_Msg, length) + 1
};

typedef TOS_Msg *TOS_MsgPtr;

uint8_t TOS_MsgLength(uint8_t type)
{
#if 0
  uint8_t i;

  for (i = 0; i < MSGLEN_TABLE_SIZE; i++)
    if (msgTable[i].handler == type)
      return msgTable[i].length;
#endif

  return offsetof(TOS_Msg, strength);
}