1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
|
/*-----------------------------------------------------------------------------
* 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;
}
|
