RTOS: vision sdk VIP capture has no callback

Tool/software: TI-RTOS

hi all,

I read the question as following link on TI community website.

http://e2e.ti.com/support/processors/f/791/t/602559?RTOS-Vision-SDK-J6-Dra7XX-VPS-loopback-application-Porting

now I have the same problem, my board is dra76xp, and video decoder is also adv7182, it is connected to VIP2 SLICE2 POARTA.

I can not get the capture data too, I check the value of register VIP_OUTPUT_PORT_A_SRC0_SIZE is  0x00000000.

My adv7182 is work now, and video source can be detected by the value of register STATUS1 (0x10) is 0x5.

could anyone please help me to figure out the problem?

best regards!