USB superspeed peripherals Forum Discussions

[bk]

hello,

I'm using cx3, and having a trouble with host application.

Window10 Camera application is okay. but AMCap (or e-cam viewer) displays black screen.

 all applications display 720(1284x720) 60fps well

but, 1080(1920x1080) 60fps is black screen (except window10 Camera Application).

Currently, I think it is Associated with Dma Buffer size. Because it depends on image size.

          #define CX3_UVC_DATA_BUF_SIZE (0x8FD0)
          #define CX3_UVC_DATA_NUM_BYTE 0x00, 0x90, 0x00, 0x00  

Could you tell me why and how to fix it?

thank you

[JayakrishnaT_76]

Hello,

Can you please share the complete UART debug logs for us to check? It looks like the issue is due to commit buffer failures which is caused due to a slow host (host application being slow in issuing IN tokens). This can be confirmed by looking into the UART debug logs. So, kindly share the logs for us to check.

[bk · Accepted solution]

Hello, 

i've fixed the bug.

and it's because wrong response to "UVC GET_DEF Request"

Thanks for your help