Accessing EDMA3 & McBSP from ARM on OMAP3530

Girisha SG

Other Parts Discussed in Thread: OMAP3530

We are using OMAP3530 EVM, we need to use McBSP from ARM side and we would like to transfer data to McBSP using EDMA3, I have the following queries

1. Can we access EDMA3 from ARM ?

2. Where can I get examples and driver libraries for using McBSP from ARM ?

3. Where can I get examples for using EDMA3 from ARM ?

over 14 years ago

0 PaulM over 14 years ago

TI__Mastermind 27995 points

I have some low level code showing how to configure the ARM, SDMA, and McBSP using mutliple buffer for transmit and receive. EDMA is used with the DSP. The example can be found at http://e2e.ti.com/support/dsp/omap_applications_processors/f/447/p/47984/268998.aspx#268998

For Linux specific questions I would suggest that you try the embedded forum (http://e2e.ti.com/support/embedded/f/354.aspx).

Paul

0 Girisha SG over 14 years ago in reply to PaulM

Intellectual 970 points

Thanks for your reply.

Can you please provide me the path from where I can get the source code for complete example so that I can use your .c file with that and test for McBSP with DMA on ARM.

0 PaulM over 14 years ago in reply to Girisha SG

TI__Mastermind 27995 points

You file the original package earlier in the same thread:

http://e2e.ti.com/support/dsp/omap_applications_processors/f/447/p/47984/186317.aspx#186317

Paul

0 Girisha SG over 14 years ago in reply to PaulM

Intellectual 970 points

The below document syays that EDMA3 is accessible from both ARM & DSP

http://ti-wiki.com/wiki/images/5/5e/EDMA3_LLD.pdf

Page Number 5

0 Girisha SG over 14 years ago in reply to Girisha SG

Intellectual 970 points

In addition to above query, what is the difference between EDMA3 & SDMA ?

0 Girisha SG over 14 years ago in reply to Girisha SG

Intellectual 970 points

Along with the above 2 questions,

How can I get to know the functionalities of following functions like,

EDMA3_DRV_setSrcIndex, EDMA3_DRV_setOptField, EDMA3_DRV_getOptField, EDMA3_DRV_setDestParams, EDMA3_DRV_setSrcIndex etc ?

0 Sundaram over 14 years ago in reply to Girisha SG

TI__Prodigy 435 points

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Girisha,

Both SDMA and EDMA are DMA engines that can be usually controlled by multiple masters (processors) and hence used as system level DMA in many TI SoC.

They have differences in the architectural level but are very similar in usability from the user perspective.

In OMAP3530 SDMA is placed in the over all system level and strongly suggested for ARM usage.

EDMA as a specific case is placed inside the IVA2.2 subsystem in OMAP3530, for exclusive usage of DSP.

I do not think it is possible to use EDMA through ARM in OMAP3530 (The document you are referring to is a general one, not specific to OMAP3530 and it happens to be a special case here).

All the functions you have mentioned are for BIOS on DSP. They are available through the EDMA3LLD package for the use of servicing McBSP (or any peripheral) or Mem to Mem copy through DSP.

Regards,

Sundaram

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Accessing EDMA3 & McBSP from ARM on OMAP3530