Linux/AM5728: USB camera support

carolyn zhang

Part Number: AM5728

Tool/software: Linux

Hi,

Does Processor SDK support USB camera on AM5728?

I make a daughter card of YUV camera connecting to my own AM5728 board, and everything is ok, the command 'dmabuftest -s 27:640x480 -d /dev/video1 -c 640x480@YUYV' runs well.

Then I bought a USB camera, which uses uvcvideo driver. I plugged the camera in USB1, and I can get image by demo 'qt-opencv-opencl-opengl-multithreaded'.

When I used command 'dmabuftest -s 27:640x480 -d /dev/video3 -c 640x480@YUYV' , by kernel 4.4.12 (PSDK 03.00.00.04), I get "ERROR: v4l2_qbuf:453: VIDIOC_QBUF failed: Bad address (-1)".

When I used command 'dmabuftest -s 32:640x480 -d /dev/video3 -c 640x480@YUYV' , by kernel 4.9.28 (PSDK 04.00.00.04), I get "ERROR: v4l2_qbuf:457: VIDIOC_QBUF failed: Bad address (-1)".

Thanks.

over 8 years ago

0 Biser Gatchev-XID over 8 years ago

TI__Guru**** 393215 points

The software team have been notified. They will respond here.

0 Bin Liu over 8 years ago

TI__Guru**** 168411 points

carolyn zhang said:
Does Processor SDK support USB camera on AM5728?

Yes, Processor Linux SDK supports USB UVC cameras on AM5728.

carolyn zhang said:
When I used command 'dmabuftest -s 32:640x480 -d /dev/video3 -c 640x480@YUYV' , by kernel 4.9.28 (PSDK 04.00.00.04), I get "ERROR: v4l2_qbuf:457: VIDIOC_QBUF failed: Bad address (-1)".

I am not familiar with dmabuftest. We always use gstreamer or yavta to test UVC cameras.

0 carolyn zhang over 8 years ago in reply to Bin Liu

Expert 1020 points

Hi,
It seems yavta could get stream only, and it is ok. I just want to see the image synchronize with UVC camera, did I need to write an application by myself? Can any command such as dmabuftest or gst-launch-1.0 etc. be used?
Thanks.

0 Bin Liu over 8 years ago in reply to carolyn zhang

TI__Guru**** 168411 points

What do you mean by 'image synchronize with UVC camera'? Take one frame of the video stream? Both yavta and gstreamer can do it.

0 carolyn zhang over 8 years ago in reply to Bin Liu

Expert 1020 points

I don't want to take one frame or frames, I want to see the video that camera takes by HDMI.

0 Bin Liu over 8 years ago in reply to carolyn zhang

TI__Guru**** 168411 points

Your initial question was if AM57x supports USB camera in Linux, I don't understand how it is related to HDMI video, can you please provide more details on what exact issue you are trying to solve?

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Linux/AM5728: USB camera support