On 27 Jun 2012 15:12:39 Pete Batard wrote:
>
> According to the error returned (LIBUSB_ERROR_NOT_FOUND) that seems to
> be the case. This is the error the Windows backend returns if it was
> unable to cache a config descriptor durin enum.
>
> Jach, if you're running a console application, can you please type the
> following in the command window where you run it:
>
> set LIBUSB_DEBUG=4
>
> This will enable debug logging, which will indicate how many
> configurations were detected or whether there was an error during the
> caching of the descriptors.
I run xusb.exe(compiled by BC++ Builder 5.0) under console, the first
run without set DEBUG. The result is:
----------------------------------
C:\Program Files\Borland\CBuilder5\Projects\LibUSBxTest>xusb 10c4:0001
Using libusbx v1.0.12.10532
Opening device...
libusbx: error [cache_config_descriptors] could not access configuration
descriptor (actu
l) for '\\.\USB#VID_10C4&PID_0001#10807001': [995] 秪俴髯磐旰麼蚚最宒
猁ㄛ垀眕眒笢
砦 I/O 紱釬﹝
bus: 3, port path from HCD: 2
speed: 12 Mbit/s (USB FullSpeed)
Reading device descriptor:
length: 18
device class: 0
S/N: 3
VID:PID: 10C4:0001
bcdDevice: 55AA
iMan:iProd:iSer: 1:2:3
nb confs: 1
Reading configuration descriptors:
LIBUSB_ERROR_NOT_FOUND
libusbx: warning [libusb_exit] application left some devices open
----------------------------------
The message of those strange characters roughly means "either
the thread ends or the application requests it, the I/O operation
was stopped"
The second run with LIBUSB_DEBUG=4. The result is a long list, so
I just list some around where that error happens:
---------------------------------
[ 0.578125] [0000069c] libusbx: debug [init_device] found 1
configurations (active conf: 1
)
[ 0.578125] [0000069c] libusbx: debug [cache_config_descriptors] cached
config descriptor
0 (bConfigurationValue=1, 34 bytes)
[ 0.578125] [0000069c] libusbx: debug [init_device] (bus: 1, addr: 2,
depth: 1, port: 2):
'\\.\USB#VID_046D&PID_C045#5&2E32EC62&0&2'
[ 0.578125] [0000069c] libusbx: debug [windows_get_device_list]
allocating new device for
session [361]
[ 0.593750] [0000069c] libusbx: debug [init_device] found 1
configurations (active conf: 1
)
[ 5.593750] [0000069c] libusbx: error [cache_config_descriptors] could
not access configur
ation descriptor (actual) for '\\.\USB#VID_10C4&PID_0001#10807001':
[995] 秪俴髯磐旰麼
蚚最宒猁ㄛ垀眕眒笢砦 I/O 紱釬﹝
[ 5.593750] [0000069c] libusbx: debug [init_device] (bus: 3, addr: 1,
depth: 1, port: 2):
'\\.\USB#VID_10C4&PID_0001#10807001'
[ 5.593750] [0000069c] libusbx: debug [windows_get_device_list]
allocating new device for
session [2E2]
[ 5.593750] [0000069c] libusbx: debug [init_device] found 1
configurations (active conf: 1
)
[ 5.609375] [0000069c] libusbx: debug [cache_config_descriptors] cached
config descriptor
0 (bConfigurationValue=1, 34 bytes)
----------------------------------------
Best Regards,
Jach
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