URGENT: Peripheral to Memory DMA Transaction

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My DMA work ok... I'm be able to copy from SDRAM to OnChip... I guess it could be a bug...

Sean

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Using HAL functions for mem-to-mem is easier i guess. but for per-to-mem, it is difficult

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Yes, I had the DMA drivers work in one direction, but not the other.

Whatever I tried, no luck.

Look in the Quartus Handbook DMA chapter (google for altera nios dma).

The registers are explained there.

You have a status register, read and write address, length and some control bits.

you program them like you did with your periereal: IOWR(AVALON_0_BASE,reg,val);

Adresses and length should be obvious.

You only need to select the correct control bits.

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Ok. thanks! I will try it now. I am trying to transfer from peripheral to sdram. if this works, then i think it should be enough. your code is transferring from peripheral to mem or mem to peripheral?

my code does both, with double DMA and interrupts.

But I don't have it here, because i'm already in the weekend ;-)))

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my code does both, with double DMA and interrupts.

But I don't have it here, because i'm already in the weekend ;-)))

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ok. thanks! i will try the dma register now

Dont forget to disable the DMA drivers in the BSP settings, or it won't work.

The HAL DMA init does something weird to the DMA...

IIRC: Right-click on the BSP project, ->Nios II->Edit BSP settings

Under drivers, all periphereals should be listed.

You should consider switching to the SBT (software build tools) flow. It has been the default for a number of Altera software releases now....soon the "classic/IDE" flow will go away.

Cheers,

slacker