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/****************************************************************************
******* *******
******* P A C K E T H E A D E R F I L E
******* *******
****************************************************************************
Author : Ian Nandhra / Jeremy Rolls
Date :
*
* (C) 1990 - 2000 Specialix International Ltd., Byfleet, Surrey, UK.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
Version : 0.01
Mods
----------------------------------------------------------------------------
Date By Description
----------------------------------------------------------------------------
***************************************************************************/
#ifndef _pkt_h
#define _pkt_h 1
#ifdef SCCS_LABELS
#ifndef lint
/* static char *_rio_pkt_h_sccs = "@(#)pkt.h 1.8"; */
#endif
#endif
#define MAX_TTL 0xf
#define PKT_CMD_BIT ((ushort) 0x080)
#define PKT_CMD_DATA ((ushort) 0x080)
#define PKT_ACK ((ushort) 0x040)
#define PKT_TGL ((ushort) 0x020)
#define PKT_LEN_MASK ((ushort) 0x07f)
#define DATA_WNDW ((ushort) 0x10)
#define PKT_TTL_MASK ((ushort) 0x0f)
#define PKT_MAX_DATA_LEN 72
#define PKT_LENGTH sizeof(struct PKT)
#define SYNC_PKT_LENGTH (PKT_LENGTH + 4)
#define CONTROL_PKT_LEN_MASK PKT_LEN_MASK
#define CONTROL_PKT_CMD_BIT PKT_CMD_BIT
#define CONTROL_PKT_ACK (PKT_ACK << 8)
#define CONTROL_PKT_TGL (PKT_TGL << 8)
#define CONTROL_PKT_TTL_MASK (PKT_TTL_MASK << 8)
#define CONTROL_DATA_WNDW (DATA_WNDW << 8)
struct PKT {
BYTE dest_unit; /* Destination Unit Id */
BYTE dest_port; /* Destination POrt */
BYTE src_unit; /* Source Unit Id */
BYTE src_port; /* Source POrt */
BYTE len;
BYTE control;
BYTE data[PKT_MAX_DATA_LEN];
/* Actual data :-) */
WORD csum; /* C-SUM */
};
#endif
/*********** end of file ***********/
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