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////////////////////////////////////////////////////////////////////////////////
//
// Filename: 	llcomms.h
//
// Project:	CMod S6 System on a Chip, ZipCPU demonstration project
//
// Purpose:	This defines a C++ interface on the command side that can
//		interact with an FPGA, both sending and receiving characters.
//		Any bus interaction will call routines from this lower level
//		library to accomplish the actual connection to and
//		transmission to/from the board.
//
// Creator:	Dan Gisselquist, Ph.D.
//		Gisselquist Technology, LLC
//
////////////////////////////////////////////////////////////////////////////////
//
// Copyright (C) 2015-2016, Gisselquist Technology, LLC
//
// This program is free software (firmware): 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 3 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 MERCHANTIBILITY 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.  (It's in the $(ROOT)/doc directory, run make with no
// target there if the PDF file isn't present.)  If not, see
// <http://www.gnu.org/licenses/> for a copy.
//
// License:	GPL, v3, as defined and found on www.gnu.org,
//		http://www.gnu.org/licenses/gpl.html
//
//
////////////////////////////////////////////////////////////////////////////////
//
//
#ifndef	LLCOMMS_H
#define	LLCOMMS_H
 
class	LLCOMMSI {
protected:
	int	m_fdw, m_fdr;
	LLCOMMSI(void);
public:
	unsigned long	m_total_nread, m_total_nwrit;
 
	virtual	~LLCOMMSI(void) { close(); }
	virtual	void	kill(void)  { this->close(); };
	virtual	void	close(void);
	virtual	void	write(char *buf, int len);
	virtual int	read(char *buf, int len);
	virtual	bool	poll(unsigned ms);
 
	// Tests whether or not bytes are available to be read, returns a 
	// count of the bytes that may be immediately read
	virtual	int	available(void); // { return 0; };
};
 
class	TTYCOMMS : public LLCOMMSI {
public:
	TTYCOMMS(const char *dev);
};
 
class	NETCOMMS : public LLCOMMSI {
public:
	NETCOMMS(const char *dev, const int port);
};
 
#endif