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