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Altera_Forum's avatar
Altera_Forum
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13 years ago

UP core: DMA Controller for video -- How to swap to the back buffer address

Hello there,

I am working on a video system with soft processing on Nios II.

Hardware: Camera MT9P001 (TRDB-D5M), Board DE2-70, LCD (TRDB-LTM).

I developped a SOPC with the following structure:

Camera -> ... -> DMA Controller for video (altera_up_avalon_video_dma_controller)

-> SSRAM -> Pixel Buffer DMA Controller (altera_up_avalon_video_pixel_buffer_dma) -> ... -> LCD.

Question:

The entire system functions now. And I'm trying to develop a C program doing some optimizations using the Eclipse.

I found that it is possible to do a dynamic swapping between the starting buffer and the back buffer for the Pixel Buffer DMA Controller, using the functions defined in "altera_up_avalon_video_pixel_buffer_dma.h" in the BSP project.

Now I would like to do the same swapping for the DMA Controller so that I can save the video stream in different parts of the SSRAM. But I cant find the same kind ".h" file for DMA Controller.

Can you help me please?

!!!: The DMA Controller I'm using is not the /bridges/DMA/DMA Controller, it is the one in the /University Program/Audio & Video

Thank you very much! :)

1 Reply

  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    13 years ago

    Adonis, what are you using as Reset Vector/Exception Vector for your Nios II processor? On my project when I use "on_chip_memory" it works, but when I use sdram it does not work. Do you have any ideas?

    Sorry, I cannot help you with your question.