Configuring the DMA for the OMAP2430

DSPfilterer

I need to configure the DMA that comes on the OMAP2430 board to take a buffer of data from a specified location and move it to a different, specified, location. The locations will not be known till the DMA is called and it will be given the numbers of the registers and the size.

I just need a push in the right direction here. I'd like to know how/where to start this project. I've not worked with registers or configurations ever before and am feeling rather lost as to where to start.

Thanks.

over 15 years ago

0 BrandonAzbell over 15 years ago

TI__Guru 65050 points

The first place to look at is the Technical Reference Manual of the device. Since the OMAP2430 is a limited engagement type of device, I presume you already have access to this documentation.

0 DSPfilterer over 15 years ago in reply to BrandonAzbell

Prodigy 110 points

I do, and it's over 2,600 pages long...

The problem is when I read it I don't understand what is being said because I've not had any exposure to something like this before.

Thanks.

0 BrandonAzbell over 15 years ago in reply to DSPfilterer

TI__Guru 65050 points

Are you programming the DMA from the ARM or DSP?

Are you targeting the SDMA, or the EDMA which is part of the IVA (DSP) subsystem?

If SDMA, Chapter 9 in the TRM is a place to start.

0 DSPfilterer over 15 years ago in reply to BrandonAzbell

Prodigy 110 points

Programming from the DSP and targeting the EDMA.

0 Brad Griffis over 15 years ago in reply to DSPfilterer

TI__Guru*** 125430 points

Here's a wiki page with some very low level code showing the type of thing you want to do:

http://processors.wiki.ti.com/index.php/Programming_EDMA_without_EDMA3LLD_package

Look in a memory window to verify the registers are being programmed the way you think they are. In other words, if they all read back zero or something along those lines even after you program them with non-zero values then you probably don't have the clocks to the EDMA turned on, which would be a fairly common "getting started" mistake to make on OMAP.

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Configuring the DMA for the OMAP2430