Re: [Nw802-main] Black screen

[Sylvain M. <tn...@24...>]

Camille HUOT wrote:

>On Mon, 24 Mar 2003 09:10:46 +0100
>Sylvain Munaut <tn...@24...> wrote:
>
>  
>
>>Camille HUOT wrote:
>>
>>    
>>
>>>Hi
>>>
>>>I got a "Mustek Wcam 300 mini", the device informations in
>>>/proc/bus/usb/devices are:
>>>
>>>C:* #Ifs= 1 Cfg#= 1 Atr=40 MxPwr=  0mA
>>>I:  If#= 0 Alt= 0 #EPs= 1 Cls=09(hub  ) Sub=00 Prot=00 Driver=hub
>>>E:  Ad=81(I) Atr=03(Int.) MxPS=   8 Ivl=255ms
>>>T:  Bus=01 Lev=01 Prnt=01 Port=00 Cnt=01 Dev#=  7 Spd=12  MxCh= 0
>>>D:  Ver= 1.00 Cls=00(>ifc ) Sub=00 Prot=00 MxPS=64 #Cfgs=  1
>>>P:  Vendor=055f ProdID=d001 Rev= 1.00
>>>
>>>So the Vendor and ProdID are the same as the Mustek Wcam300.
>>>
>>>The driver is well recognizing the webcam at the webcam plug:
>>>
>>>hub.c: USB new device connect on bus1/1, assigned device number 7
>>>nw802.c: Compatible DivIO NW80x based webcam found ! [Mustek WCam 300
>>>/ PCLine PCL-W300]
>>>
>>>and the /dev/video0 is well created in my devfs.
>>> 
>>>
>>>      
>>>
>>This cam should be OK ... several people reported it to work.
>>Is this  the last release of the CVS version ? You may try CVS .
>>    
>>
>
>Of course it is.
>
>  
>
>>>And in the dmesg (for the driver debug):
>>>
>>>Mar 22 16:57:27 poseidon kernel: usbvideo.c: Packet Statistics:
>>>Total=64. Empty=64. Usage=0%% Mar 22 16:57:27 poseidon kernel:
>>>usbvideo.c: Transfer Statistics: Transferred=0 B Usage=0%% Mar 22
>>>16:57:27 poseidon kernel: usbvideo.c: Packet Statistics: Total=64.
>>>Empty=64. Usage=0%% Mar 22 16:57:27 poseidon kernel: usbvideo.c:
>>>Transfer Statistics: Transferred=0 B Usage=0%% Mar 22 16:57:27
>>>poseidon kernel: usbvideo.c: Packet Statistics: Total=64. Empty=64.
>>>Usage=0%% Mar 22 16:57:27 poseidon kernel: usbvideo.c: Transfer
>>>Statistics: Transferred=0 B Usage=0%%
>>>
>>>Et voila.
>>>
>>>The mustek wcam 300 should work (as it is reported to do), do you
>>>have any clue, advice, experience report concerning this problem ?
>>> 
>>>
>>>      
>>>
>>Try loading the module with option debug=5 it may give a clue ....
>>    
>>
>
>the dmesg during the insmod:
>
>
>nw802.c: nw802_probe(...)
>nw802.c: Compatible DivIO NW80x based webcam found ! [Mustek WCam 300 /
>PCLine PCL-W300] nw802.c: Number of alternate settings : 8
>nw802.c: Active setting=1 maxPS=960
>usbvideo.c: nw802 on /dev/video0: canvas=320x240 videosize=320x240
>nw802.c: Module loaded
>
>with xawtv launched (same debug as before), I got nearly 64 lines every
>seconds in the desmg like this:
>
>Mar 24 09:20:19 poseidon kernel: nw802.c: nw802_processIsocData
>Mar 24 09:20:19 poseidon kernel: nw802.c: Frame ready for decoding
>  
>
... If a frame is ready for decoding then it's decoded and displayed 
...But usbvideo report 0b tranfered so no header should be found ... HTH 
is this possible ...
I may have an idea ... may be when the packet is empty the 
nw802_processIsocData don't work well, it doesn't check for data 
availibility for performance. But a single test as the start should be 
OK  ( to test if the packet is empty ).

I'm working ( planning ) on a driver that would dump the raw stream to a 
char device ... I'm afraid you'll have to wait for this one to check the 
raw datastream content. If you have any experience in kernel/char device 
programming you can help, because I never wroted a char device ...

>I think this is ok :(
>
>Do you think an usb sniff under Windows can help ?
>  
>
Well It wasn't a so great idea after all ... ;)

Sylvain Munaut