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[/] [w11/] [tags/] [w11a_V0.61/] [tools/] [fx2/] [src/] [eeprom.c] - Rev 26
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/* $Id: eeprom.c 395 2011-07-17 22:02:55Z mueller $ */ /*----------------------------------------------------------------------------- * FTDI EEPROM emulation *----------------------------------------------------------------------------- * Copyright (C) 2007 Kolja Waschk, ixo.de *----------------------------------------------------------------------------- * This code is part of usbjtag. usbjtag is free software; 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 2 of the License, * or (at your option) any later version. usbjtag 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 in the file * COPYING; if not, write to the Free Software Foundation, Inc., 51 Franklin * St, Fifth Floor, Boston, MA 02110-1301 USA *----------------------------------------------------------------------------- */ #include "eeprom.h" #include "usb_descriptors.h" xdata unsigned char eeprom[128]; extern xdata char dscr_vidpidver[6]; extern xdata char dscr_attrpow[2]; extern xdata char dscr_usbver[2]; extern xdata char dscr_strorder[4]; extern xdata char str1[]; extern xdata char str2[]; extern xdata char str3[]; static unsigned char ee_ptr; static unsigned short ee_cksum; void eeprom_append(unsigned char nb) { unsigned char pree_ptr = ee_ptr & ~1; if(pree_ptr != ee_ptr) { ee_cksum = ee_cksum ^((unsigned short)nb << 8); ee_cksum = ee_cksum ^ eeprom[pree_ptr]; ee_cksum = (ee_cksum << 1) | (ee_cksum >> 15); }; eeprom[ee_ptr++] = nb; } void eeprom_init(void) { char j,sofs; ee_ptr = 0; ee_cksum = 0xAAAA; eeprom_append(0x00); eeprom_append(0x00); for(j=0;j<6;j++) eeprom_append(dscr_vidpidver[j]); for(j=0;j<2;j++) eeprom_append(dscr_attrpow[j]); eeprom_append(0x1C); eeprom_append(0x00); for(j=0;j<2;j++) eeprom_append(dscr_usbver[j]); sofs = 0x80 + ee_ptr + 6; eeprom_append(sofs); eeprom_append(str1[0]); sofs += str1[0]; eeprom_append(sofs); eeprom_append(str2[0]); sofs += str2[0]; eeprom_append(sofs); eeprom_append(str3[0]); for(j=0;j<str1[0];j++) eeprom_append(str1[j]); for(j=0;j<str2[0];j++) eeprom_append(str2[j]); for(j=0;j<str3[0];j++) eeprom_append(str3[j]); for(j=0;j<4;j++) eeprom_append(dscr_strorder[j]); while(ee_ptr < 126) eeprom_append(0); eeprom[126] = ee_cksum&0xFF; eeprom[127] = (ee_cksum>>8)&0xFF; }