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Le Mardi 21 Juin 2005 02:58, Joe Lovick a =E9crit=A0:
> Hi just wondering what was happening about this particular chipset (i have
> a canon LIDE 35) and if their is anything i can do to help? i am a happy c
> coder but am new to SANE.
> if thier is something i can do to help even if it is just testing then
> please give me a shout.
> cheers
> joe
Hello,
I think that the first thing to do, is to have your scanner working
under=
=20
windows and install usbsniff. So you'll be able to get logs from scanning=20
sessions. Then you have to analyze data to understand what's going on, and=
=20
try to make the backend do the same. At first, it may be hard, but once you=
=20
gained enough momentum, it is much easier.
The raw logs can be simplified with awk scripts such as the one
attached.=
=20
Once you identify things in log, you can write another awk script that tur=
ns=20
data in a readable form. The motor.awk is a sample of what can be done. It=
=20
works on the file produced by parse1.awk. In the end, you have a script tha=
t=20
process logs through a bunch of awk files and produce a high level=20
representation of what is going on. The gl841_r17.pdf documents register us=
e=20
and values, and will help you in the process.
Next, you have to write code that tries to do the same. When testing
it, y=
ou=20
compare backend logs with decoded usb log, and fix differences until it=20
works.
Regards,
Stef
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# Hi! this script is a awk program script.
# Usage is: time awk -f parse1.awk usbsnoop.log > log1
#
# What does it do ?
# Extract usefull infos from sniffusb logs
#
# It works with sniffusb 1.8
# modified from Franck ZAGO's parse1.awk script which was
# loosely based on a script by Thomas SOUMARMON ([email protected]).
#
BEGIN {
action = "";
buffer[0] = 0;
rtype = 0;
request = 0;
value = 0;
rindex = 0;
ignore_urb = 0;
last_int_urb = -1;
}
{
if(NR==1)
urb = strtonum($5)-1;
if ($4 == "URB") {
# New URB
this_urb = strtonum($5);
if (this_urb == last_int_urb) {
# this interrupt URB is coming back
ignore_urb = 1;
next;
}
if (way == "down" && $7 == "down") {
# This URB is also an interrupt URB
printf "URB %5d skip\n", this_urb;
ignore_urb = 1;
last_int_urb = this_urb;
next;
}
old_way = way;
way = $7;
if (way == "back") {
if (urb != this_urb) {
printf "got URB back %d instead of %d at line
%d\n", this_urb, urb, NR;
exit;
}
}
else if (way == "down") {
ignore_urb = 0;
if (this_urb != urb+1 && this_urb != urb+2) {
printf "expected URB down %d instead of %d at
line %d\n", urb+1, this_urb, NR;
exit;
}
if (last_int_urb != urb) {
if (endpoint == "CONTROL") {
printf "URB %5d control 0x%02x 0x%02x
0x%02x 0x%02x len %5d", urb, rtype, request, value, rindex, buflen;
if (direction == "OUT") {
printf(" wrote ");
} else {
printf(" read ");
}
for (i=0; i<buflen; i++)
printf("0x%02x ", buffer[i]);
printf("\n");
}
else if (endpoint == "BULK_IN") {
printf "URB %5d bulk_in len %5d read
", urb, buflen;
for (i=0; i<buflen; i++)
printf("0x%02x ", buffer[i]);
printf("\n");
}
else if (endpoint == "BULK_OUT") {
printf "URB %5d bulk_out len %5d
wrote ", urb, buflen;
for (i=0; i<buflen; i++)
printf("0x%02x ", buffer[i]);
printf("\n");
}
}
}
else {
printf("BAD line %d", NR);
exit;
}
/* Next urb */
urb = strtonum($5);
}
if (ignore_urb) {
next;
}
if ($1 == "PipeHandle") {
if ($5 == "0x00000002]") endpoint = "BULK_OUT";
else if ($5 == "0x00000081]") endpoint = "BULK_IN";
else if ($5 == "0x00000083]") {
printf "URB %5d skip\n", urb;
ignore_urb = 1;
way = "back"; # do as if we got the answer
last_int_urb = urb;
next;
}
else endpoint = "CONTROL";
}
if ($1 == "TransferBufferLength") buflen=strtonum("0x"$3);
if ($1 == "RequestTypeReservedBits") rtype=strtonum("0x"$3);
if ($1 == "Request") request=strtonum("0x"$3);
if ($1 == "Value") value=strtonum("0x"$3);
if ($1 == "Index") {
rindex=strtonum("0x"$3);
get_data = 0;
}
if ($4 == "(USBD_TRANSFER_DIRECTION_IN,") direction="IN";
if ($4 == "(USBD_TRANSFER_DIRECTION_OUT,") direction="OUT";
if ($2 == "URB_FUNCTION_VENDOR_DEVICE:") action="vendor";
if ($2 == "URB_FUNCTION_BULK_OR_INTERRUPT_TRANSFER:") action="bulk";
if ($2 == "URB_FUNCTION_CONTROL_TRANSFER:") action="control";
# Take care of the data
if ($1 == "UrbLink") {
get_data = 0;
if (data_left != 0) {
printf("error line %d (data left)\n", NR);
exit;
}
}
if (get_data) {
if (data_left > 16)
data_len = 16;
else
data_len = data_left;
if (NF == (data_len+1)) {
data_left = data_left - data_len;
for (i=0; i<data_len; i++) {
buffer[data_index] = strtonum("0x"$(i+2));
data_index ++;
}
} else {
printf("error line %d (invalid data)\n", NR);
exit;
}
}
# We don't want to get data all the time.
if ($1 == "TransferBufferMDL") {
if ((direction == "OUT" && way == "down") ||
(direction == "IN" && way == "back")) {
get_data = 1;
data_left = buflen;
data_index = 0;
}
}
}
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#URB 251 bulk_out len 2 wrote 0x0f 0x01
BEGIN {
ex=""
}
{
if(($6=="wrote")&&($7=="0x0f")&&($8=="0x01")&&($5=="2"))
{
print "startMotor()"
getline
}
else
{
if(($6=="wrote")&&($7=="0x0f")&&($8=="0x00")&&($5=="2"))
{
print "stopMotor()"
getline
}
else
print ex
}
ex=$0
}
END {
print ex
}
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