TMS320F28388D: Question about MemCfg_setGSRAMControllerSel function usage

Hello,

In your debug session, are you making sure you select the correct core when trying to view that memory? You need to make sure that you select CPU2 in the Debug window that appears with your debug session, this does not happen automatically.

If you've done so already, can you show me what values you're storing to these variables in your code and what is appearing in the Memory Browser (i.e. the hex values)?

Hello, engineer.

Yes, my debugging window is in CPU2 with the following variables as an example

I set the initial values of these variables as follows

Memory Browser：

Thank you very much！

Looking forward to your reply！

Unfortunately since I don't have a working F2838xD device on hand I can't replicate this on my side.

Can you try to use the float64_t datatype in place of the double datatype? Does this happen with other variables, arrays, or datatypes (i.e. int, char, etc.)? does adding the 'volatile' keyword affect this?

My algorithm requires high precision and I have to use double variables during the calculation. Do you have any colleagues who have used F28388D, could you please contact them? Also, can you share me a few use cases of MemCfg_setGSRAMControllerSel function?
Thanks a lot!
Looking forward to your reply!

Hello Zhou,

I have used the F2838xD and am familiar with the device (it is not too drastically different then using any of the other newer devices we have).

Zhou xiaojun said:

Also, can you share me a few use cases of MemCfg_setGSRAMControllerSel function?

This function is used to configure which CPU has access to the GSRAM used in the parameter. You should set this at the beginning of the code and not switch it back and forth between one CPU and the other (if you need to do something like communicating data between the two CPUs, you should use IPC).

Hi Engineer, My CPU1 is used for data communication and CPU2 is used for data processing, I have used IPC to accomplish the task of sending data from CPU1 to CPU2, and my MemCfg_setGSRAMControllerSel function is working fine! Yesterday one of the engineers told me that in order to load the code in flash, the flash API needs to be loaded into RAM, so some values are changed to assign some GSxRAM to CPU2. the garbage values are actually the flash API code that is loaded into these RAMs. Please how can I solve this kind of problem
Thanks a lot!
Looking forward to your reply!

Zhou xiaojun said:

Yesterday one of the engineers told me that in order to load the code in flash, the flash API needs to be loaded into RAM

That is correct, Flash API must be run from RAM only.

Zhou xiaojun said:

the garbage values are actually the flash API code that is loaded into these RAMs.

The engineer will need to look at the linker command file and allocate the global variables to one of the RAMs that are not likely to be overwritten, that way the variables retain their values. To do this, you can look at what memory is assigned to the .bss section (which holds the global variables per the Linker Command File page). Either this, or the engineer can use a pragma statement to locate the global variable to a specific memory location: #pragma DATA_SECTION(var_name, "ramgs##").

Is this where you are referring to modifying the .bss, as shown below, I modified it from RAMLS3 to RAMGS4, but it didn't do the trick!

Subsequently, I used #pragma DATA_SECTION(qnb, "RAMGS4") (as an example of qnb) The value in qnb was restored to normal, but after editing the following alarm occurs, will this alarm have any effect on the program operation?

I was able to fix the memory issue and the variable no longer shows the garbage count, but there is the warning I mentioned earlier!
Hello, the last thing you sent me was an image and I can't access the URL above, can you send me the text?
Thank you very much!
Merry Christmas!

Hello Zhou,

The link above should work fine, the text for the warning is included entirely above; for the link within that screenshot, there is too much text for me to include in a single screenshot. I will put both URLs below, let me know if you have trouble accessing them:

https://software-dl.ti.com/ccs/esd/documents/sdto_ccs_build-errors.html

https://software-dl.ti.com/ccs/esd/documents/sdto_cgt_Linker-Command-File-Primer.html

Merry Christmas!

Thank you, I've solved the problem