| 1 | /*-----------------------------------------------------------------------------
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| 2 | * FTDI EEPROM emulation
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| 3 | *-----------------------------------------------------------------------------
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| 4 | * Copyright (C) 2007 Kolja Waschk, ixo.de
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| 5 | *-----------------------------------------------------------------------------
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| 6 | * This code is part of usbjtag. usbjtag is free software; you can redistribute
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| 7 | * it and/or modify it under the terms of the GNU General Public License as
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| 8 | * published by the Free Software Foundation; either version 2 of the License,
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| 9 | * or (at your option) any later version. usbjtag is distributed in the hope
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| 10 | * that it will be useful, but WITHOUT ANY WARRANTY; without even the implied
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| 11 | * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 12 | * GNU General Public License for more details. You should have received a
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| 13 | * copy of the GNU General Public License along with this program in the file
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| 14 | * COPYING; if not, write to the Free Software Foundation, Inc., 51 Franklin
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| 15 | * St, Fifth Floor, Boston, MA 02110-1301 USA
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| 16 | *-----------------------------------------------------------------------------
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| 17 | */
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| 18 |
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| 19 | #include "eeprom.h"
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| 20 | #include "usb_descriptors.h"
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| 21 |
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| 22 | xdata unsigned char eeprom[128];
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| 23 |
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| 24 | extern xdata char dscr_vidpidver[6];
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| 25 | extern xdata char dscr_attrpow[2];
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| 26 | extern xdata char dscr_usbver[2];
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| 27 | extern xdata char dscr_strorder[4];
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| 28 | extern xdata char str1[];
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| 29 | extern xdata char str2[];
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| 30 | extern xdata char str3[];
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| 31 |
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| 32 | static unsigned char ee_ptr;
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| 33 | static unsigned short ee_cksum;
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| 34 |
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| 35 | void eeprom_append(unsigned char nb)
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| 36 | {
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| 37 | unsigned char pree_ptr = ee_ptr & ~1;
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| 38 | if(pree_ptr != ee_ptr)
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| 39 | {
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| 40 | ee_cksum = ee_cksum ^((unsigned short)nb << 8);
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| 41 | ee_cksum = ee_cksum ^ eeprom[pree_ptr];
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| 42 | ee_cksum = (ee_cksum << 1) | (ee_cksum >> 15);
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| 43 | };
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| 44 | eeprom[ee_ptr++] = nb;
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| 45 | }
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| 46 |
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| 47 | void eeprom_init(void)
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| 48 | {
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| 49 | char j,sofs;
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| 50 | ee_ptr = 0;
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| 51 | ee_cksum = 0xAAAA;
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| 52 |
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| 53 | eeprom_append(0x00);
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| 54 | eeprom_append(0x00);
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| 55 | for(j=0;j<6;j++) eeprom_append(dscr_vidpidver[j]);
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| 56 | for(j=0;j<2;j++) eeprom_append(dscr_attrpow[j]);
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| 57 | eeprom_append(0x1C);
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| 58 | eeprom_append(0x00);
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| 59 | for(j=0;j<2;j++) eeprom_append(dscr_usbver[j]);
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| 60 | sofs = 0x80 + ee_ptr + 6;
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| 61 | eeprom_append(sofs);
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| 62 | eeprom_append(str1[0]);
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| 63 | sofs += str1[0];
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| 64 | eeprom_append(sofs);
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| 65 | eeprom_append(str2[0]);
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| 66 | sofs += str2[0];
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| 67 | eeprom_append(sofs);
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| 68 | eeprom_append(str3[0]);
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| 69 | for(j=0;j<str1[0];j++) eeprom_append(str1[j]);
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| 70 | for(j=0;j<str2[0];j++) eeprom_append(str2[j]);
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| 71 | for(j=0;j<str3[0];j++) eeprom_append(str3[j]);
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| 72 | for(j=0;j<4;j++) eeprom_append(dscr_strorder[j]);
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| 73 | while(ee_ptr < 126) eeprom_append(0);
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| 74 | eeprom[126] = ee_cksum&0xFF;
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| 75 | eeprom[127] = (ee_cksum>>8)&0xFF;
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| 76 | }
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| 77 |
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