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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
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15 years ago

How about your txrxDone function?

Ensure that the txrx_done variable is declared as volatile to prevent any optimisations from reading the value properly.

Check that tx_data and rx_buffer are pointed to valid memory areas, and memories the DMA's avalon masters are actually connected to.

If it still doesn't work, put some Signaltap probes on the DMA component to see what it is doing and if/where it gets stuck.