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/* $Id: eeprom.c 395 2011-07-17 22:02:55Z mueller $ */
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/*-----------------------------------------------------------------------------
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* FTDI EEPROM emulation
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*-----------------------------------------------------------------------------
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* Copyright (C) 2007 Kolja Waschk, ixo.de
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*-----------------------------------------------------------------------------
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* This code is part of usbjtag. usbjtag is free software; you can redistribute
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* it and/or modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the License,
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* or (at your option) any later version. usbjtag is distributed in the hope
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* that it will be useful, but WITHOUT ANY WARRANTY; without even the implied
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* warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details. You should have received a
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* copy of the GNU General Public License along with this program in the file
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* COPYING; if not, write to the Free Software Foundation, Inc., 51 Franklin
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* St, Fifth Floor, Boston, MA 02110-1301 USA
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*-----------------------------------------------------------------------------
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*/
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#include "eeprom.h"
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#include "usb_descriptors.h"
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xdata unsigned char eeprom[128];
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extern xdata char dscr_vidpidver[6];
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extern xdata char dscr_attrpow[2];
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extern xdata char dscr_usbver[2];
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extern xdata char dscr_strorder[4];
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extern xdata char str1[];
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extern xdata char str2[];
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extern xdata char str3[];
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static unsigned char ee_ptr;
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static unsigned short ee_cksum;
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void eeprom_append(unsigned char nb)
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{
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unsigned char pree_ptr = ee_ptr & ~1;
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if(pree_ptr != ee_ptr)
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{
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ee_cksum = ee_cksum ^((unsigned short)nb << 8);
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ee_cksum = ee_cksum ^ eeprom[pree_ptr];
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ee_cksum = (ee_cksum << 1) | (ee_cksum >> 15);
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};
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eeprom[ee_ptr++] = nb;
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}
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void eeprom_init(void)
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{
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char j,sofs;
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ee_ptr = 0;
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ee_cksum = 0xAAAA;
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eeprom_append(0x00);
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eeprom_append(0x00);
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for(j=0;j<6;j++) eeprom_append(dscr_vidpidver[j]);
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for(j=0;j<2;j++) eeprom_append(dscr_attrpow[j]);
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eeprom_append(0x1C);
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eeprom_append(0x00);
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for(j=0;j<2;j++) eeprom_append(dscr_usbver[j]);
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sofs = 0x80 + ee_ptr + 6;
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eeprom_append(sofs);
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eeprom_append(str1[0]);
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sofs += str1[0];
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eeprom_append(sofs);
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eeprom_append(str2[0]);
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sofs += str2[0];
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eeprom_append(sofs);
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eeprom_append(str3[0]);
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for(j=0;j<str1[0];j++) eeprom_append(str1[j]);
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for(j=0;j<str2[0];j++) eeprom_append(str2[j]);
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for(j=0;j<str3[0];j++) eeprom_append(str3[j]);
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for(j=0;j<4;j++) eeprom_append(dscr_strorder[j]);
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while(ee_ptr < 126) eeprom_append(0);
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eeprom[126] = ee_cksum&0xFF;
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eeprom[127] = (ee_cksum>>8)&0xFF;
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}
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