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Altera_Forum
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20 years ago

About DMA problem..please help me

hi all I have try the altera memory test project with Nios II IDE.. but always display "-Testing memory using DMA"... http://forum.niosforum.com/work2/style_emoticons/<#EMO_DIR#>/sad.gif the...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
16 years ago

You could have a cache problem. The CPU could be reading its data cache instead of the buffer in memory.

Try to create a second pointer:
alt_u8 *uncached_buffer = alt_remap_uncached(buffer,DEPTH);
and when you print the contents of the buffer, read the data with uncached_buffer[x], and see if you have different results.