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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