How can I store image frames to DDR2 DM6437?

Ahmet,

I am not able to understand what exactly you are trying to do. Please rephrase or clarify.

By DACD, do you mean one of the DAC output? DAC-3? Are you doing some kind of background subtraction? or are you simply processing the difference between every two consecutive frames?

For now, with limited knowledge on what you are trying to do, I think you just need to keep two buffers in the DDR. keep updating them in a pingpong fashion. VPFE has its internal DMA that grabs data from the CCDC and store it into DDR. Please read the user guide for more information.

Firstly,thank for your help Paul.I'm MsC student.My final project is about video stabilization on DM6437.And I have no experience about DM6437.

I mean one of the DAC output.I have code example about video preview.I used the example in here:

http://processors.wiki.ti.com/index.php/Accessing_pixels_in_a_frame_on_DM643x

In this example I can access pixels in VPSS .And I can send it to the DACD output.But my aim is firstly to find motion vectors between video frames according to my project.So I must acess past frames and I compare current and past frame.Therefore,Dsp will capture frame and will send the frame to DDR2 or another register that is possible.After second capture,Dsp will read frame in DDR2,and CCS will compare between frame in the buffer and in the DDR2 to find motion vector.And this will go on during grab 100 frame from CCDC.

Could you advise me simple code example or useful guides about this topic?

Best Regards..

Hello Ahmet,

Are you using BIOS & DVSDK? Because that's what that wiki was based on.
I am not aware of any example code like this, at least nothing simple.

You should think carefully about your application, define threads and processes. If you have specific question, we'd be glad to help.

Some quick pointers on something you can try. In your application, you will need 2 buffers that stores the current & most recent past frame. Each time FVID_exchange returns with the current buffer, whatever your process does, which most likely is running in another thread, needs to start. The next time FVID_exchange is called, use the other buffer as the argument (ping-pong). This needs to be done in a while(1) loop.

Doing this application using based on the BIOS&DVSDK framework might be quite time consuming if you are not familiar with the APIs. If your metion detection/estimation/tracking algorithm is not difficult, you should just do it in a simple CCS application without BIOS & DVSDK.

Let me know whether you want to stick with BIOS & DVSDK

Hello Paul,

Yes I'm using BIOS& DVSDK in this example .

But of course I could use different methods about dsp that you advise and I want to implement  this aplication with less time consuming.

My motion dedection algorithm is based on mean absolute differences between current and past frame.

You mention that  I wil need 2 buffers and FVID_exchange returns with the current buffer.How can I use two buffer on DM6437 and should I store different frames at different registers?

Could you give me  detailed information please?