DMA transfer from SDRAM to PIO

Altera_Forum · ‎11-24-2005

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 teach me how to use DMA ?

If possible, could you show me a simple example.

(I'm newbe for embedded system.

For me, This is first time to use DMA.)

Thank you.

Best regards.

Altera_Forum · ‎12-06-2005

To simplify life, I wouldn't use any eCos DMA stuff; I'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.

Altera_Forum · ‎12-07-2005

Thank you Mike.

Now, I can use DMA with IOWR.

And I use your FIFO interface now.

Thank you again.