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Altera_Forum's avatar
Altera_Forum
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12 years ago

setting an RX and TX channels on the same DMA

Hi

In my current system there are 2 DMAs for transferring data between a peripheral and an SRAM.

one DMA is dedicated for RX and the other is for RX.

for a better resource usage I'm trying to merge the 2 DMAs into one, the idea is to define 2 DMA channels to get the same functionality with half the resource.

for some reason I fail to define that in software.

I'm using Q12.0 sp2 with SOPC builder, and a NIOS processor.

the software uses the uCOS II operating system and I'm using the HAL functions.

can any one point me to a reference design a tutorial on how to achieve my goal?

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  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    12 years ago

    Some more info:

    I forgot to add that both the peripheral and the SRAM are MM avalon.

    Today I found out that if I run my software on a DMA that has it's read master connected to SRAM and write master connected to the peripheral the DMA works.

    when I connect the both the read and write masters to the SRAM the DMA (configured by the same software) stops to work.