Loading external array directly to RAM instead of shared memory

Jacob Gontmacher

Other Parts Discussed in Thread: OMAP-L138

I'm using OMAP-L138. I have an external array that I need to load. When this array is small enough it fits into shared memory but then it's huge, I get 'Out of memory' error as expected. I'm looking for a way to load the external array directly to 128MB mDDR.

To load my array into shared RAM i wrote:
const float YN[]={
#include "MYDATA.txt"
};

Is it possible?

Thanks.

over 13 years ago

0 Uday over 13 years ago

TI__Expert 4920 points

Hi Jacob

This is the C64x Multicore DSP forum and is for high-performance multicore DSP support. For questions on OMAP-L13x, please post your query to http://e2e.ti.com/support/dsp/omap_applications_processors/f/42.aspx

Here is a general way this can be done on the DSP side:

If not already present, define a RTSC configuration and platform for your CCS project as highlighted here http://e2e.ti.com/support/embedded/bios/f/355/t/178610.aspx

Next you need to specify a memory section. From SPRAAS7D: "Memory sections in SYS/BIOS 6 are specified to load into Memory segments using the Program module’s sectMap[ ] array. This array maps section name strings to the Memory segments into which that section is to be loaded. This pseudo-configuration code shows a mapping: Program.sectMap[“<section name>”] = <Memory segment>.name; You should replace <section name> above with the string name of the section to be mapped. Also, replace <Memory segment> with the Memory segment name to load that section into."

As an example, in your BIOS cfg file, say bios6.cfg, you would add:
Program.sectMap[".arraybuff"] = "DDR3";

In your C code, you would place your buffer in this section as:
#ifdef __TI_COMPILER_VERSION__
#pragma DATA_SECTION(pUserArray, ".arraybuff");
#pragma DATA_ALIGN(pUserArray, 8);
#endif
int_least16_t pUserArray[MAXSIZE];

You can then populate your array with the contents of the .txt file.

Hope that helps. For any future queries, please post your question to the OMAP-L1 e2e forum at http://e2e.ti.com/support/dsp/omap_applications_processors/f/42.aspx

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Loading external array directly to RAM instead of shared memory