Forum Discussion

Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
13 years ago

ALT_AVALON_DMA_NSLOTS - how to increase FIFO size for DMA scheduler

Looking into HAL driver code for DMA I've found, that scheduler array is limited by ALT_AVALON_DMA_NSLOTS macro, which is defined in altera_avalon_dma.h as (4). This apparently means, that no...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
13 years ago

I'll answer myself:

after quite a lot of messing around the ALT_AVALON_DMA_NSLOTS must be setup in BSP editor in bsp_cflags_optimization.

So in my case this contains:

-Os -DALT_AVALON_DMA_NSLOTS=16

this can be setup as well in TCL script used to generate BSP:

set_setting hal.make.bsp_cflags_optimization "-Os -DALT_AVALON_DMA_NSLOTS=16"

Recompile BSP and you get support for 15 DMA records. Apparently this works.