Subversion Repositories usb_fpga_2_14

/*%

   ZTEX Firmware Kit for EZ-USB FX2 Microcontrollers

   Copyright (C) 2009-2017 ZTEX GmbH.

   http://www.ztex.de

   This Source Code Form is subject to the terms of the Mozilla Public

   License, v. 2.0. If a copy of the MPL was not distributed with this file,

   You can obtain one at http://mozilla.org/MPL/2.0/.

   Alternatively, the contents of this file may be used under the terms

   of the GNU General Public License Version 3, as described below:

   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/.

%*/

/*

    Common functions for FPGA configuration from SPI flash

*/

__code BYTE fpga_flash_boot_id[] = {'Z','T','E', 'X', 'B', 'S', '\1', '\1'};

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

   ***** fpga_first_free_sector ****************************************

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

// First free sector. Returns 0 if no boot sector exeists.   

// Use the macro FLASH_FIRST_FREE_SECTOR instead of this function.

#ifeq[FLASH_ENABLED][1]

#define[FLASH_FIRST_FREE_SECTOR][fpga_first_free_sector()];

WORD fpga_first_free_sector() {

    BYTE i,j;

#ifdef[@CAPABILITY_MAC_EEPROM;]

    __xdata WORD buf[2];

    if ( config_data_valid ) {

        mac_eeprom_read ( (__xdata BYTE*) buf, 26, 4 );         // read actual and max bitstream size 

        if ( buf[1] != 0 ) {

            return ( ( ( buf[1] > buf[0] ? buf[1] : buf[0] ) - 1 ) >> ((flash_sector_size & 255) - 12) ) + 1;

        }

    }

#endif    

    flash_read_init( 0 );                                // prepare reading sector 0

    for ( i=0; i<8 && flash_read_byte()==fpga_flash_boot_id[i]; i++ );

    if ( i != 8 ) {

        flash_read_finish(flash_sector_size - i);       // dummy-read the rest of the sector + finish read opration

        return 0;

    }

    i=flash_read_byte();

    j=flash_read_byte();

    flash_read_finish(flash_sector_size - 10);          // dummy-read the rest of the sector + finish read opration

    return (i | (j<<8))+1;

}

#endif        

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

   ***** fpga_configure_from_flash_init ********************************

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

// this function is called by init_USB;

BYTE fpga_configure_from_flash_init() {

#ifneq[FLASH_BITSTREAM_FORCE_ENABLED][1]

#ifeq[FLASH_ENABLED][1]

    BYTE i;

#endif        

#ifdef[@CAPABILITY_MAC_EEPROM;]

    __xdata WORD buf[2];

    if ( config_data_valid ) {

        mac_eeprom_read ( (__xdata BYTE*) buf, 26, 4 );         // read actual and max bitstream size 

        if ( buf[1] != 0 ) {

            if ( buf[0] == 0 ) {

                return fpga_flash_result = 3;

            }

//          return 10;

            goto flash_config;

        }

//          return 15;

    }

#endif    

#ifeq[FLASH_ENABLED][1]

    // read the boot sector

    if ( flash_read_init( 0 ) )          // prepare reading sector 0

        return fpga_flash_result = 2;

    for ( i=0; i<8 && flash_read_byte()==fpga_flash_boot_id[i]; i++ );

    if ( i != 8 ) {

        flash_read_finish(flash_sector_size - i);       // dummy-read the rest of the sector + finish read opration

        return fpga_flash_result = 3;

    }

    i = flash_read_byte();

    i |= flash_read_byte();

    flash_read_finish(flash_sector_size - 10);          // dummy-read the rest of the sector + finish read opration

    if ( i==0 )

        return fpga_flash_result = 3;

#else

    return 2;

#endif        

#endif        

flash_config:

    fpga_flash_result = fpga_configure_from_flash(0);

    if ( fpga_flash_result == 1 ) {

        post_fpga_config();

    }

    else if ( fpga_flash_result == 4 ) {

        fpga_flash_result = fpga_configure_from_flash(0);        // up to two tries

    }

    return fpga_flash_result;

}

#define[INIT_CMDS;][INIT_CMDS;

fpga_flash_result= 255;

]