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Altera_Forum
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20 years ago

DMA transfer from SDRAM to PIO

Hello. I'm now trying to use DMA for transferring data from SDRAM to PIO. But I don't know how to use DMA in eCos. (I searched this forum, but I couldn't find.) Can someone...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
20 years ago

To simplify life, I wouldn&#39;t use any eCos DMA stuff; I&#39;d talk right to the DMA hardware with IORD/IOWR (in <cyg/hal/io.h>). Read the Altera documentation on the DMA peripheral and its registers. Starting the DMA should amount to four IOWR()s; one each to set source and destination addresses and word count, and another to set the transfer-type flags and start the DMA.