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Altera_Forum
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13 years ago

use descriptor chain in SGDMA

Hi all My current goal is to use SGDMA (ST-to-MM) to transfer video data to a memory. Later on, I'll replace the memory by PCIE IP. My problem is how to use descriptor chain in SGDMA. ...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
13 years ago

Hi Daixiwen

Thank you for the suggestions.

My design works perfect when I use the function alt_uncached_malloc() to allocate two buffers. Correct data are printed out even if I access buffers without using IORD.

By the way, I declare these two buffers outside all functions in my previous program so I think they are global variables.

I guess using the global variables may not solve this problem.