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ZTEX |
/*!
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ZTEX Firmware Kit for EZ-USB FX2 Microcontrollers
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Copyright (C) 2009-2014 ZTEX GmbH.
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http://www.ztex.de
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License version 3 as
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published by the Free Software Foundation.
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This program is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, see http://www.gnu.org/licenses/.
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!*/
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/*
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Common functions for FPGA configuration from SPI flash
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*/
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__code BYTE fpga_flash_boot_id[] = {'Z','T','E', 'X', 'B', 'S', '\1', '\1'};
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/* *********************************************************************
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***** fpga_first_free_sector ****************************************
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********************************************************************* */
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// First free sector. Returns 0 if no boot sector exeists.
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// Use the macro FLASH_FIRST_FREE_SECTOR instead of this function.
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#define[FLASH_FIRST_FREE_SECTOR][fpga_first_free_sector()];
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WORD fpga_first_free_sector() {
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BYTE i,j;
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#ifdef[@CAPABILITY_MAC_EEPROM;]
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__xdata WORD buf[2];
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if ( config_data_valid ) {
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mac_eeprom_read ( (__xdata BYTE*) buf, 26, 4 ); // read actual and max bitstream size
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if ( buf[1] != 0 ) {
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return ( ( ( buf[1] > buf[0] ? buf[1] : buf[0] ) - 1 ) >> ((flash_sector_size & 255) - 12) ) + 1;
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}
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}
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#endif
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flash_read_init( 0 ); // prepare reading sector 0
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for ( i=0; i<8 && flash_read_byte()==fpga_flash_boot_id[i]; i++ );
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if ( i != 8 ) {
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flash_read_finish(flash_sector_size - i); // dummy-read the rest of the sector + finish read opration
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return 0;
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}
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i=flash_read_byte();
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j=flash_read_byte();
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flash_read_finish(flash_sector_size - 10); // dummy-read the rest of the sector + finish read opration
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return (i | (j<<8))+1;
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}
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/* *********************************************************************
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***** fpga_configure_from_flash_init ********************************
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********************************************************************* */
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// this function is called by init_USB;
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BYTE fpga_configure_from_flash_init() {
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BYTE i;
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#ifdef[@CAPABILITY_MAC_EEPROM;]
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__xdata WORD buf[2];
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if ( config_data_valid ) {
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mac_eeprom_read ( (__xdata BYTE*) buf, 26, 4 ); // read actual and max bitstream size
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if ( buf[1] != 0 ) {
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if ( buf[0] == 0 ) {
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return fpga_flash_result = 3;
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}
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// return 10;
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goto flash_config;
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}
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// return 15;
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}
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#endif
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// read the boot sector
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if ( flash_read_init( 0 ) ) // prepare reading sector 0
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return fpga_flash_result = 2;
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for ( i=0; i<8 && flash_read_byte()==fpga_flash_boot_id[i]; i++ );
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if ( i != 8 ) {
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flash_read_finish(flash_sector_size - i); // dummy-read the rest of the sector + finish read opration
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return fpga_flash_result = 3;
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}
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i = flash_read_byte();
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i |= flash_read_byte();
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flash_read_finish(flash_sector_size - 10); // dummy-read the rest of the sector + finish read opration
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if ( i==0 )
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return fpga_flash_result = 3;
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flash_config:
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fpga_flash_result = fpga_configure_from_flash(0);
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if ( fpga_flash_result == 1 ) {
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post_fpga_config();
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}
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else if ( fpga_flash_result == 4 ) {
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fpga_flash_result = fpga_configure_from_flash(0); // up to two tries
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}
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return fpga_flash_result;
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}
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#define[INIT_CMDS;][INIT_CMDS;
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fpga_flash_result= 255;
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]
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