EDMA3_LLD memory requirement

serdar

Other Parts Discussed in Thread: ADS8332, OMAPL138

Hi,

I use DSPBIOS 5.42.01.09 and developed driver for ADS8332 (SPI interface). I used EDMA3_LLD from pspdriver 1.30 and compiler version is 7.4.2.

My code works good. I can use EDMA without problem. But the thing I couldn't understand is memory requirement of EDMA3_LLD. I give map file below and as you can see, it requires almost 90KBytes for text and far sections. Do you believe that it is normal, 90K for basic EDMA processes? How can I reduce memory usage or what can I use to replace EDMA3_LLD? I checked some threads in the forum and simply common idea is using LLD is better than using CSL.

Thanks Regards,

Serdar

over 12 years ago

0 Leonardo Trierveiler over 12 years ago

Intellectual 385 points

I'm having the same problem. The EDMA driver here requires over 140kB. The C6746 only has 256k L2SRAM, it'll be impossible to run anything with this. Is there another solution for this? Or I'll need to program de EDMA without the driver?

0 Sivaraj Kuppuraj over 12 years ago

TI__Mastermind 35645 points

Hi Serdar,

Thanks for your post.

To get a better overview of LLD & optimization tips, you shall refer the DSP/BIOS Integration Workshop on EDMA3 Low Level Driver as below:

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

Please refer the below wiki to program the EDMA3 using the LLD:

http://processors.wiki.ti.com/index.php/Programming_the_EDMA3_using_the_Low-Level_Driver_(LLD)

You shall refer the below E2E thread for optimizing the memory cycles between external memory and L2.

http://e2e.ti.com/support/embedded/bios/f/355/t/131801.aspx

Hope it helps!!!

Thanks & regards,

Sivaraj K

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0 Norman Wong over 12 years ago in reply to Leonardo Trierveiler

Guru 26430 points

Wow. I checked my old map file and EDMA does use up a lot of memory. I think TI assumes that you have lots of DDR memory. I eventually had to abandon the ARM/Linux - DSPLink and DSP - BIOS -DSPLink - EDMA_LLD -PSP model with DDR for a DSP - StarterWare model without DDR. StarterWare has it's own problems with quality but it's more in the spirit of a small embedded system.

0 serdar over 12 years ago in reply to Sivaraj Kuppuraj

Intellectual 390 points

Sivaraj,

Thanks for your answer. I had already checked all the sources.

I wonder that if I use CSL what will be the memory requirement? I've been looking for CSL EDMA examle for C6748 but I couldn't find good one. If you reach an example code, could you please share it?

Serdar

0 Sivaraj Kuppuraj over 12 years ago in reply to serdar

TI__Mastermind 35645 points

Hi Serdar,

Thanks for your update.

There is a QuickStartOMAPL1x rCSL package available for EDMA examples which can be downloaded from the below wiki:

http://processors.wiki.ti.com/index.php/QuickStartOMAPL1x_rCSL#Downloads

The above examples are developed on OMAPL138 EVM but the DSP side examples of OMAPL138 should be compatible with C6748 SOM. The following are the rCSL EDMA examples included in the package:

EDMA_event_trig

EDMA_manual_trig

EDMA_ping_pong

EDMA_self_chain

You can also download the CSL example codes for all C6000 devices in the below wiki:

http://processors.wiki.ti.com/index.php/Chip_support_library#Chip_Support_Library_for_C6747_and_C6748

Please refer the CSL API reference guide for C6000 devices in which you can see EDMA module (Chapter 7) listing the API functions and macros as below:

http://www.ti.com/lit/ug/spru401j/spru401j.pdf

Thanks & regards,

Sivaraj K

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EDMA3_LLD memory requirement