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

//

// Filename:    sdspisim.h

//

// Project:     Wishbone Controlled SD-Card Controller over SPI port

//

// Purpose:     This library simulates the operation of a SPI commanded SD-Card,

//              such as might be found on a XuLA2-LX25 board made by xess.com.

//

//      This simulator is for testing use in a Verilator/C++ environment, where

//      it would be used in place of the actual hardware.

//

// 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 SDSPISIM_H

#define SDSPISIM_H

#include <stdio.h>

typedef enum    eRESET_STATES {

        SDSPI_POWERUP_RESET,

        SDSPI_CMD0_IDLE,

        SDSPI_RCVD_CMD8,

        SDSPI_RCVD_ACMD41,

        SDSPI_RESET_COMPLETE,

        SDSPI_IN_OPERATION

} RESET_STATES;

#define SDSPI_RSPLEN    8

#define SDSPI_MAXBLKLEN (1+2048+2)

#define SDSPI_CSDLEN    (16)

#define SDSPI_CIDLEN    (16)

class   SDSPISIM {

        FILE            *m_dev;

        unsigned long   m_devblocks;

        int             m_last_sck, m_delay, m_mosi;

        bool            m_busy, m_debug, m_block_address, m_altcmd_flag,

                        m_syncd, m_host_supports_high_capacity, m_reading_data,

                        m_have_token;

        RESET_STATES    m_reset_state;

        int             m_cmdidx, m_bitpos, m_rspidx, m_rspdly, m_blkdly,

                                m_blklen, m_blkidx, m_last_miso, m_powerup_busy,

                                m_rxloc;

        char            m_cmdbuf[8], m_dat_out, m_dat_in;

        char            m_rspbuf[SDSPI_RSPLEN];

        char            m_block_buf[SDSPI_MAXBLKLEN];

        char            m_csd[SDSPI_CSDLEN], m_cid[SDSPI_CIDLEN];

public:

        SDSPISIM(const bool debug = false);

        void    load(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);

        unsigned cmdcrc(int ln, char *buf) const;

        bool    check_cmdcrc(char *buf) const;

        unsigned blockcrc(int ln, char *buf) const;

        void    add_block_crc(int ln, char *buf) const;

};

#endif