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

//

// Filename:    spiflashsim.h

//

// Project:     Wishbone Controlled Quad SPI Flash Controller

//

// Purpose:     This library simulates the operation of a Quad-SPI commanded

//              flash, such as the S25FL032P used on the Basys-3 development

//              board by Digilent.  As such, it is defined by 32 Mbits of

//              memory (4 Mbyte).

//

// Creator:     Dan Gisselquist

//              Gisselquist Technology, LLC

//

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

//

// Copyright (C) 2015, 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 QSPIFLASHSIM_H

#define QSPIFLASHSIM_H

#define QSPIF_WIP_FLAG                  0x0001

#define QSPIF_WEL_FLAG                  0x0002

#define QSPIF_DEEP_POWER_DOWN_FLAG      0x0200

class   QSPIFLASHSIM {

        typedef enum {

                QSPIF_IDLE,

                QSPIF_QUAD_READ_IDLE,

                QSPIF_RDSR,

                QSPIF_RDCR,

                QSPIF_WRSR,

                QSPIF_CLSR,

                QSPIF_RDID,

                QSPIF_RELEASE,

                QSPIF_FAST_READ,

                QSPIF_QUAD_READ_CMD,

                QSPIF_QUAD_READ,

                QSPIF_SECTOR_ERASE,

                QSPIF_PP,

                QSPIF_QPP,

                QSPIF_BULK_ERASE,

                QSPIF_DEEP_POWER_DOWN,

                QSPIF_INVALID

        } QSPIF_STATE;

        QSPIF_STATE     m_state;

        char            *m_mem, *m_pmem;

        int             m_last_sck;

        unsigned        m_write_count, m_ireg, m_oreg, m_sreg, m_addr,

                        m_count, m_config, m_mode_byte, m_creg;

        bool            m_quad_mode, m_debug;

public:

        QSPIFLASHSIM(void);

        void    load(const char *fname) { load(0, fname); }

        void    load(const unsigned addr, const char *fname);

        void    debug(const bool dbg) { m_debug = dbg; }

        bool    debug(void) const { return m_debug; }

        int     operator()(const int csn, const int sck, const int dat);

};

#endif