Hi fellows,

I'm implementing a UVC device with user-specific commands. I enabled controls in extension unit in UVC device and try to send commands from host via DirectX.

My questions are,

1. Does the generic UVC driver on Windows XP support sending user commands or I should implement my own driver to send them to device? 

2. What's the behavior when the user controls in extension unit are enabled? What requests will I recevie when UVC setup and how to reply them?

Any comments are welcome and appreciated.

BR, Wallace

When you say user-specific commands are you talking about vendor requests or class specific requests which allow you to change the parameters of the feed dynamically?

Regards,

Anand

Sorry I didn't state clearly. What I meant is vendor-specific controls.

The UVC driver is inbox to Windows and we've not really tried playing with its features. Let me see if I'm able to pull-up content on this topic and post here.

Regards,

Anand

 Hi Anand,

Thank you. I'd like to share what I found for now.

I enabled a control in extension unit. During enumeration UVC device will receive GET_LEN request only. 

I found discussion regarding this as below, it says UVC device should apply an iterrupt endpoint thus Windows will send requests such as GET_INFO, GET_MIN, GET_MAX.,etc.

http://social.technet.microsoft.com/Forums/en-US/itproxpsp/thread/f2490343-92b4-42c7-ae17-ff79665372b7/

Unfortunately I still couldn't get the requests after adding the interrupt to UVC descriptor.

Here's what I added to descriptor

/* VideoControl Status Interrupt Endpoint Descriptor */

0x07,                           /* Descriptor size */

CY_U3P_USB_ENDPNT_DESCR,        /* Endpoint Descriptor Type */

0x82,        /* Endpoint address and description */

0x03,             /* Interrupt End point Type */

0x00,0x04,                      /* Max packet size = 1024 bytes */

0x01,                           /* Servicing interval */

/* Super Speed Endpoint Companion Descriptor */

0x06,                           /* Descriptor size */

 CY_U3P_SS_EP_COMPN_DESCR,       /* SS Endpoint Companion Descriptor Type */

0x00,                           /* Max no. of packets in a Burst : 1 */

0x00,                           /* Attribute: N.A. */

0x00,                           /* Bytes per interval:1024 */

0x04, 

 /* Class Specific Interrupt Endpoint Descriptor */

0x05,                           /* Descriptor size */

0x25,                           /* Class Specific Endpoint Descriptor Type */

0x03,             /* End point Sub Type */

0x40,0x00,                      /* Max packet size = 64 bytes */   

BR, Wallace

 Hi Wallace,

Generic UVC driver of XP will not support the UVC exetension unit commands. To support UVC extension unit commands, you have to develope a UVC extension unit plug-in for Windows XP and register it with OS.

Please check the following link:

http://msdn.microsoft.com/en-us/library/windows/hardware/ff568656(v=VS.85).aspx

BTW, are you able to stream the UVC frames in FX3, if it so at what resolution and what is the frame rate?

Thanks

Subbarao.