TMS320C6678: How to use DMA to transfer data from DDR3 to MSMC, L2SRAM, or L1SRAM ? Where can I find good simple examples ?

Feng P.

Part Number: TMS320C6678
Other Parts Discussed in Thread: SYSBIOS

Hi All,

I need to use DMA to speed up my code and I potentially need to transfer data from and to DDR3, MSMC, L2SRAM, or L1SRAM on a TMDSEVM6678LE.

I very generally know the concept of DMA and I found some good general introduction Multicore Fixed and Floating-Point Digital Signal Processor.

Please let me know where I can find and learn more about C libraries for that matter and good examples because I guess I just need to know the software API side of it and probably don't need to know that much hardware related details.

Do I need to write assembly code for that ?

Please let me know your valuable comments.

Thank you,

over 5 years ago

0 Feng P. over 5 years ago

Intellectual 570 points

I found a good manual below under installation folder:

file:///C:/ti/edma3_lld_2_12_05_30E/release_notes_edma3_lld.html#Introduction

I am not sure if that is all I need or there more ... ??!!

0 Victor Kazmirenko over 5 years ago in reply to Feng P.

Guru 13202 points

Hello!

LLD is recommended way to deal with EDMA3. Nevertheless, we use CSL based in-house implementation just because our environment is static and we could plan everything in advance. My approach is do all initialization, prepare transfers configurations, save them to variables and then trigger transfers with preconfigured settings. There is example in PDK somewhere like pdk_C6678_1_1_2_6\packages\ti\csl\example\edma\edma_test.c . Also not that C6678 is supported in latest Processor SDK, so you might find some examples there.

0 lding over 5 years ago in reply to Victor Kazmirenko

TI__Guru* 95265 points

Thanks rrlagic!

There are several ways as pointed out:

1. Use EDMA LLD: edma3_lld_2_12_05_30E\examples\edma3_driver\src\main.c

2. Use CSL: pdk_c667x_2_0_16 or pdk_C6678_1_1_2_6\packages\ti\csl\example\edma\edma_test.c

You don't need to write assembly code.

Regards, Eric

0 Feng P. over 5 years ago in reply to lding

Intellectual 570 points

I only see two examples ... none seem to use "edma3_lld_2_12_05_30E\examples\edma3_driver\src\main.c"

I'd like to study a complete project examples if any ...

let me read through the code I get back to you if I have any question.

Thanks

0 lding over 5 years ago in reply to Feng P.

TI__Guru* 95265 points

Hi,

Please refer to https://e2e.ti.com/support/processors/f/791/t/934188. There are either CSL baremetal examples or EDMA LLD SYSBIOS examples, no has CCS project, all use makefile.

Regards, Eric

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TMS320C6678: How to use DMA to transfer data from DDR3 to MSMC, L2SRAM, or L1SRAM ? Where can I find good simple examples ?