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Altera_Forum's avatar
Altera_Forum
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15 years ago

Words are swapped after DMA transfer

Hello, I'm trying to copy data from one part of the DDR2 Memory via DMA to the other parts. First I fill a part of the DDR2 memory with data (a counter). Then I copy this part to a different...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
15 years ago

I fixed my problem by using the following addresses \o/:

dma_transfer_general((void*)ALTMEMDDR_1_BASE,(void*)(ALTMEMDDR_1_BASE+0x1500008),transfer_size);

dma_transfer_general((void*)(ALTMEMDDR_1_BASE+0x1500008),(void*)(ALTMEMDDR_1_BASE+0x3000008),transfer_size);

I'm not sure why it worked, but it did. Maybe it somehow uses 64 bits addressing in stead of 32, so I had to start at ALTMEMDDR_1_BASE+0x1500008 in stead of

ALTMEMDDR_1_BASE+0x1500004. (ALTMEMDDR_1_BASE being address 0xC000000).

Thanks for the ideas :).