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jnagy
Level 5
Level 5
250 sign-ins 50 questions asked 5 solutions authored

I am modifying my UVC descriptors to enable MJPEG streaming in addition to uncompressed but am encountering an error where the device cannot enumerate. Using USB Tree View, I cannot see the specific error being encountered, only that it is not enumerating. This started occuring once I started modifying the wTotalLength field of my Class-specific VS Interface Input Header Descriptor so I think my calculation for this value is correct. My current way to calculate that value is the following:

...
VC-Specific VS Video Input Header Descriptor (size=0x0F)
    0x01 larger than with 1 format b/c 1 extra format
VS Uncompressed Format Type Descriptor (size=0x1B)
VS Uncompressed Frame Type Descriptor (size=0x1E)
VS Color Matching Descriptor Descriptor (size=0x06)
Video Streaming MJPEG Format Type Descriptor (size=0x0B)
Video Streaming MJPEG Frame Type Descriptor (size=0x1E)
VS Color Matching Descriptor Descriptor (size=0x06)
...

 So I am calculating that the wTotalLength field should be 7D. Is this correct? I am not sure if the Color Matching descriptors should be included in wTotalLength field.

Thanks

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8 Replies
MallikaK_22
Moderator
Moderator
Moderator
50 likes received 750 replies posted 250 solutions authored

Hi,

Could you let us know what all changes were made to the descriptor files?

Could you share your descriptor file with us?

Regards,

Mallika

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Is there an email I can send the files to?

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MallikaK_22
Moderator
Moderator
Moderator
50 likes received 750 replies posted 250 solutions authored

Hi,

Kindly send them to mallika.khare@infineon.com

Regards,

Mallika

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Ive sent an email regarding descriptor issues Ive been seeing.

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MallikaK_22
Moderator
Moderator
Moderator
50 likes received 750 replies posted 250 solutions authored

Hi,

Apologies but I didn't get the email. When did you send it?

Regards,

Mallika

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I sent it 2 days ago. I resent it just now.

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jnagy
Level 5
Level 5
250 sign-ins 50 questions asked 5 solutions authored

Here is my project. It is password protected and I PMed you the password.

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MallikaK_22
Moderator
Moderator
Moderator
50 likes received 750 replies posted 250 solutions authored

Hi,

I don't know why is this issue happening but I'm not receiving your email.

There is a private message option in the community. Please either use that option as it will be directly sent to me or if possible you can share only your descriptor file for now here.

Regards,

Mallika

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