Re: How to use the Nios DMA?

Altera_Forum · ‎02-17-2005

Hi, in order to improve the performance, I hope use the Nios DMA (Not Nios II) module to increase the transfer speed. But now I don't know how to use it. I simply use its subroutine on my original circuit, but it does not work. So, can anybody send a simple exaple to me?? Thus, let me understand the design method of DMA module between the software and the hardware. And I will very appreciate your kindness. Thanks.

Altera_Forum · ‎02-18-2005

sorry, my email address is pipiwau@yahoo.com.tw

Altera_Forum · ‎02-20-2005

Why not NIOS2 ?

I where made DMA to speed up transfer between 2 memory's using nios2 and it not very dificault

And i use HAL for that

I can give examle to you

if it's exactly that what you want.

Altera_Forum · ‎02-21-2005

Here is soft for using DMA on NIOS2

void memcpy_my(int *where,int * from,int howmurch)

{

while ((IORD_ALTERA_AVALON_DMA_STATUS(WR_DMA_BASE) & ALTERA_AVALON_DMA_STATUS_BUSY_MSK));

IOWR_ALTERA_AVALON_DMA_CONTROL(WR_DMA_BASE,0);

IOWR_ALTERA_AVALON_DMA_STATUS(WR_DMA_BASE, 0);

IOWR_ALTERA_AVALON_DMA_LENGTH(WR_DMA_BASE, howmurch);

IOWR_ALTERA_AVALON_DMA_RADDRESS(WR_DMA_BASE, from);

IOWR_ALTERA_AVALON_DMA_WADDRESS(WR_DMA_BASE, where);

IOWR_ALTERA_AVALON_DMA_CONTROL(WR_DMA_BASE,ALTERA_AVALON_DMA_CONTROL_GO_MSK |

ALTERA_AVALON_DMA_CONTROL_BYTE_MSK|

ALTERA_AVALON_DMA_CONTROL_WEEN_MSK|

ALTERA_AVALON_DMA_CONTROL_LEEN_MSK);

while ((IORD_ALTERA_AVALON_DMA_STATUS(WR_DMA_BASE) & ALTERA_AVALON_DMA_STATUS_BUSY_MSK));# ifdef DEBUG

printf("\nDMA packet\nfrom 0x%x\nwhere - 0x%x\nhowmurch - %d",from,where,howmurch);

short status=0;# endif

}

Altera_Forum · ‎07-21-2009

But what headers are required ? Does it work under uClinux (I have read this (http://www.altera.com/literature/hb/nios2/n2sw_nii52010.pdf), is it enough ?) ? Do I have to use nios-ide ? Can I use only the nios2-toolchain ? Sorry for the many question.

Altera_Forum · ‎08-03-2009

Hi All,

I'm trying to use NIOS2 DMA too, but actually I have to transfer data to/from an external device from/to my NIOS2 cpu. Please,

what's your impression on this, does anyone have some suggestion to me in the architecture definition? I should have some kind of input/output

device to connect to the dma avalon master, maybe a PIO? and how to manage FLOW control trough the PIO, for DMA and my external

device?

Thanks a Lot Massy