Subversion Repositories usb_fpga_1_2

/*!

   ZTEX Firmware Kit for EZ-USB Microcontrollers

   Copyright (C) 2008-2009 ZTEX e.K.

   http://www.ztex.de

   This program is free software; you can redistribute it and/or modify

   it under the terms of the GNU General Public License version 3 as

   published by the Free Software Foundation.

   This program is distributed in the hope that it will be useful, but

   WITHOUT ANY WARRANTY; without even the implied warranty of

   MERCHANTABILITY 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; if not, see http://www.gnu.org/licenses/.

!*/

/*

    supports AT45D* Flash on Port E

*/

#ifndef[ZTEX_FLASH_H]

#define[ZTEX_FLASH_H]

#define[FLASH_SI_BIT][6]

#define[FLASH_SO_BIT][4]

#define[FLASH_CLK_BIT][5]

#ifeq[PRODUCT_IS][UFM-1_1]

#define[FLASH_CS_BIT][3]

//#warning[FLASH_CS_BIT=3]

#else

#define[FLASH_CS_BIT][7]

//#warning[FLASH_CS_BIT=7]

#endif

xdata BYTE flash_buffer = 1;          // current buffer 1

xdata BYTE flash_bufferModified = 0;  // 1 indicates that the current flash page needs to be reprogrammeded

xdata WORD flash_page = 0xffff;       // current flash page

xdata WORD flash_nextPage = 0xffff;   // next flash page (usually flashPage+1)

xdata WORD flash_maxPage = 0;         // next flash page (usually flashPage+1)

xdata WORD flash_pageSize = 528;      // page size (512 or 528)

xdata BYTE flash_register[4];         // used to store register content 

/* *********************************************************************

   ***** flash_setPage *************************************************

   ********************************************************************* */

/* set the current page, i.e. executes the following steps

    1. wait if busy

    2. read the desired page from the falsh array into the new buffer

    3. write the old buffer to the flash array (if modified)

*/

static void flash_setPage(WORD page)

{

    flash_nextPage = page + 1;

}

/* *********************************************************************

   ***** flash_write ***************************************************

   ********************************************************************* */

/* writes <bytes> bytes at address <addr> to the current buffer starting at <offs>.

   If <setNextPage> = 1 the next page (defined by <flash_nextPage> is set automatically

*/

static void flash_write(WORD addr, WORD bytes, WORD offs, BYTE setNextPage)

{

    addr = 0;

    bytes = 0;

    offs = 0;

    setNextPage = 0;

}

/* *********************************************************************

   ***** flash_write ***************************************************

   ********************************************************************* */

static void flash_readRegister(BYTE cmd)

{

    BYTE oe,b,i,j;

    b = OEE & ( ~( (1 << FLASH_SO_BIT) | (1 << FLASH_SI_BIT) | (1 << FLASH_CLK_BIT) | (1 << FLASH_CS_BIT) ) );

    oe = IOE & b;

    IOE = oe | (1 << FLASH_CS_BIT);   // CS = 1

    OEE = b | (1 << FLASH_SI_BIT) | (1 << FLASH_CLK_BIT) | (1 << FLASH_CS_BIT);

    IOE = oe;                         // CS = 0

    // CLK=0

    for ( i=0; i<8; i++ ) {

        IOE = b = oe | ((cmd & 128) >> (7-FLASH_SI_BIT)); // CLK = 0, SI=x

        IOE = b | (1 << FLASH_CLK_BIT);                   // CLK = 1, SI=x

        cmd <<= 1;

    }

    for ( j=0; j<4; j++ ) {

        // CLK = 1

        b = 0;

        for ( i=0; i<8; i++ ) {

            IOE = oe;                          // CLK = 0, SO=x

            b = (b << 1) | ((IOE >> FLASH_SO_BIT) & 1);

            IOE = oe | (1 << FLASH_CLK_BIT);  // CLK = 1

        }

        flash_register[j]=b;

    }

    IOE = oe | (1 << FLASH_CS_BIT);   // CS = 1

}

/* *********************************************************************

   ***** EP0 vendor request 0x40 ***************************************

   ********************************************************************* */

ADD_EP0_VENDOR_REQUEST((0x40,,

    flash_readRegister(SETUPDAT[2]);

    EP0BUF[0] = flash_register[0];

    EP0BUF[1] = flash_register[1];

    EP0BUF[2] = flash_register[2];

    EP0BUF[3] = flash_register[3];

    EP0BCH = 0;

    EP0BCL = 4;

,,));;

#endif  /*ZTEX_DESCRIPTORS_H*/