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////////////////////////////////////////////////////////////////////////////////

//

// Filename:    deppi.h

//

// Project:     CMod S6 System on a Chip, ZipCPU demonstration project

//

// Purpose:     This package attempts to convet a DEPP over USB based

//              communication system into something similar to a serial port

//      based communication system.  Some differences include the fact that,

//      if the DEPP port isn't polled, nothing comes out of the port.  Hence,

//      on connecting (or polling for the first time) ... there might be a 

//      bunch of stuff to (initially) ignore.

//

// 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 DEPPI_H

#define DEPPI_H

#include "dpcdecl.h"

#include "dmgr.h"

// #include "devbus.h"

//

#define PKTLEN  32

#define RCV_BUFLEN      512

#define RCV_BUFMASK     (RCV_BUFLEN-1)

#include "llcomms.h"

class   DEPPI : public LLCOMMSI { // DEPP Interface

private:

        HIF     m_dev;

        bool    m_int, m_err;

        char    m_rbuf[RCV_BUFLEN];

        char    m_txbuf[2*PKTLEN], m_rxbuf[2*PKTLEN];

        int     m_rbeg, m_rend;

        virtual int     pop_fifo(char *buf, int len);

        virtual void    push_fifo(char *buf, int len);

        virtual void    raw_read(int len, int timeout_ms);

        virtual void    flush_read(void);

        void    depperr(void);

public:

        DEPPI(char *szSel);

        ~DEPPI(void);

        virtual void    close(void);

        virtual int     read(char *buf, int len);

        virtual int     read(char *buf, int len, int timeout_ms);

        virtual void    write(char *buf, int len);

        virtual bool    poll(unsigned ms);

};

#endif // DEPPI_H