// $Id: garmin_link.h,v 1.1.1.1 2000/02/21 06:17:23 decouto Exp $// garmin_link.h// Douglas S. J. De Couto// May 26, 1998// Copyright (C) 1998 Douglas S. J. De Couto// <decouto@lcs.mit.edu>//// 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.// Class for handling garmin link level protocol L000/1 for gps receivers// Based on information in ``Garmin GPS Interface Specification'' , from // Garmin tech support, May 6 1998.  Handles handshaking, checksumming, // and data escaping.#ifndef _garlink#define _garlink#include "garmin_phys.h"#include "garmin_packet.h"#include "garmin_types.h"namespace garmin {	class link_layer {public:		link_layer() : m_init(false) { }	link_layer(const link_layer &) : m_init(false) { }		link_layer(physical_layer *pl, int retries = 3) 	: m_init(true), m_pl(pl), m_retries(retries) { }		void init(physical_layer *pl, int retries = 5) 	{ m_init = true, m_pl = pl; m_retries = retries; }		packet_id get_packet(uint8 *data, uint8 &sz) throw (not_possible, timeout);	// return the packet ID of the next available packet; packet	// payload goes into DATA, which must point to at least 255 bytes	// of storage.  The number of data bytes goes into SZ.		void put_packet(packet_id id, uint8 *data, uint8 sz) throw (not_possible, timeout);	// send a packet.	private:		bool m_init;	physical_layer *m_pl;	uint8 m_buf[256];	int m_retries;};} // namespace#endif // _garlink