TDA4VM: The video stream already exists, and while TDA4 is continuously receiving the video stream, it is unable to obtain images during initialization and graph creation.

Jia xuening

Prodigy 60 points

Part Number: TDA4VM

Tool/software:

Hi Ti Experts:

We have a requirement to open the camera's video stream in advance, so we conducted some experiments:

(1) create graph → verify graph → start video stream (images can be obtained);

(2) start video stream → create graph → verify graph (images cannot be obtained; through code analysis, we found that the UDMA interrupt cannot be triggered at this point).

Therefore, we have the following two questions:

(1) Can our second test approach be implemented?

(2) If it can be implemented, what modifications would be necessary?

Thanks and best regards.

11 months ago

0 Fabiana Jaimes 11 months ago

TI__Mastermind 19680 points

Hi,

Which HLOS and SDK version are you using?

Thank you,

Fabiana

0 Jia xuening 11 months ago in reply to Fabiana Jaimes

Prodigy 60 points

HI,

Our testing is conducted on a Linux system, and the SDK version we are using is 08.04.00.06

Thanks and best regards.

0 Jia xuening 11 months ago in reply to Fabiana Jaimes

Prodigy 60 points

HI,

Our testing is conducted on a Linux system, and the SDK version we are using is 08.04.00.06

Thanks and best regards.

0 Brijesh Jadav 11 months ago

TI__Guru**** 478345 points

Hi Jia xuening,

We need to follow this sequence, essentially streaming needs to be started only after graph verification to support initial handshake. If streaming is started before CSIRX PHY is configured, handshake would be missed and then it would not be able to capture the frames.. Its ok to keep clock running, but data must be enabled/started only after PHY is configured, ie after graph verification.

Regards,

Brijesh

Processors

Processors forum

TDA4VM: The video stream already exists, and while TDA4 is continuously receiving the video stream, it is unable to obtain images during initialization and graph creation.