/*----------------------------------------------------------------------------- * 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;}