UVC for STM32F429I Discovery Board

Hi,

Maybe you have problems with the descriptor.

I do not know if there is something similar in windows, but you can plug your board to an android device (ICS or higher) over the usb, or usb otg an take the information of your board with an app like this:

https://play.google.com/store/apps/details?id=aws.apps.usbDeviceEnumerator&hl=es

or any other similar, and check if this information (taken from your usb descriptor) is like you expected, PID, VID, classes, interfaces, endpoints....

If you find an app to do this in windows, even better.

If the info is not correct try to change to an usb descriptor from an existing comercial product, this topic talks about it https://my.st.com/public/STe2ecommunities/mcu/Lists/cortex_mx_stm32/Flat.aspx?RootFolder=https%3a%2f%2fmy%2est%2ecom%2fpublic%2fSTe2ecommunities%2fmcu%2fLists%2fcortex_mx_stm32%2fAny%20example%20on%20STM32F2xx%20with%20UVC&FolderCTID=0x01200200770978C69A1141439FE559EB459D7580009C4E14902C3CDE46A77F0FFD06506F5B&currentviews=3768

And be patient, usb is not trivial

I don't think that the 429 Discovery board supports High Speed USB - I've looked at the schematics and there is no High Speed PHY on the board.

MK

I'm sorry  -  I have no idea what your last question means but I'll guess:

Read the datasheet for the processor page 39 of Rev 5 data sheet:

The devices embed a USB OTG high-speed (up to 480 Mb/s) device/host/OTG peripheral.

The USB OTG HS supports both full-speed and high-speed operations. It integrates the

transceivers for full-speed operation (12 MB/s) and features a UTMI low-pin interface (ULPI)

for high-speed operation (480 MB/s). When using the USB OTG HS in HS mode, an

external PHY device connected to the ULPI is required.

MK

Hi,

Which is your status?

How did you get that the PC recognize the board as an imaging device?

STM32F4Cube code changing the usb descriptor file?

regards,

yes the PC showing my board as an imaging device.

I have used STM32CUBE code only, but instead of existing class i have taken custom class and changed the descriptor according to UVC class.

Now i am using isochronous data transmission to send my image data to PC.

But i am not able to send the data.

http://www.beyondlogic.org/usbnutshell/usb4.shtml So you do not mind a few dropped frames and will only send data one way? Why not bulked transfers?

http://www.beyondlogic.org/usbnutshell/usb4.shtml So you do not mind a few dropped frames and will only send data one way? Why not bulked transfers?

Either is okay for me. Ultimately my goal is to get video streaming.

You need updated PC driver to have matching endpoints. Did you do?

I have the PC drivers, that's how the PC detected my board as an UVC device(Imaging device).

Hi,

You need a software in the PC reading the same endpoints.

Which one are you using?

You can try VLC media player to connect to the imagging device detected, and see what happens.

But I think it is not just sending video from the board to the PC, I think that first there is a a deal between PC and the imaging device to stablish, resolution, video format, frame per second... And the functions that deal these issues are should be defined in the usb class (in this case your custom class). I have never used before uvc class, so sory for no further details

Regards,

Miguel

I am using device monitoring studio software to read the data through the endpoints.

and i have a GUI which can initiate the transfer from board to PC.

It showing as length is zero as shown in attachment.

I have already programmed resolution format and frames per second in descriptors.

Not sure of software you use, but I bet you need to push data not pull data

My board is in device mode, and PC is in host mode. So PC should initiate the communication and ofcourse my board need to push data whenever it get a call from PC

Hi,

How is it going your project?

About the last issues, which is your video source?

If your problem is the video source, maybe you can try send get the code (rgb, yuv...) for a picture of the supposed video size, put into your code and keep on sending it as it is a video streaming.

By other way, are you sure you are sending the YUV, RGB or whatever data to the same endpoint that the software in the PC is reading?

Regards,

Miguel

Hi,

I am sending a static image to my PC now. If that transmitted then i will send the image data continuously.

But i am not able to send anything to my PC through end points.

Hi.I am having the same exact problem. Did you find a work around or solution&