TMS320F28379D: CLA memcpy

vincent liebart

Intellectual 510 points

Part Number: TMS320F28379D
Other Parts Discussed in Thread: SYSCONFIG, C2000WARE

Tool/software:

Hello,

I want to use the CLA in the FLASH configuration

I expected to copy the CLA code from FLASH to RAM.

I saw that this copy request is asked by the Init function generated by SysConfig:

So, I asked to SysConfig to generate the needed Symbols into the Command Linker File, that I use for my project:

As you can see, the CMD file generates loadStart_cla1Prog, but the CLA_init() function needs Cla1funcsRunStart, and so on ...

What surprised me is that my example seems to work anyway:

- cla_led_control is a variable declared in cla1ToCpuMsgRAM

- in the task 1 of CLA I toggle the boolean value of this variable

- in the CLA_Task1 ISR of the CPU I set an output of the microcontroller at this variable

- Periodically in the main loop of the CPU I force a call to CLA thanks to CLA_forceTasks()

The output is toggling, even if I disconnect the LAUNCHPAD and the JTAG with the DipSwitch 3 on the board.

Can anyone tell me

why my example seems to work ?

what is the right way to do ?

In advance, thank you.

Vincent

4 months ago

0 Ozino Odharo 4 months ago

TI__Mastermind 20642 points

HI Vincent,

It looks like you're using the SysConfig linker cmd file generation. I do believe it generates symbols that map to the expected linker symbols specified in code. So that explains why it is working. If you have any doubts or questions, I will recommend you check out the SysConfig based CLA examples provided in C2000Ware to get a sense how those functions are written. For additional information on the sysconfig linker command tool, check out this app note: https://www.ti.com/lit/an/sprad49/sprad49.pdf

You can also reference this document that shows how to add CLA support to an existing example: /cfs-file/__key/communityserver-discussions-components-files/171/CLAProjectStructureUG.pdf

Regards,

Ozino

0 vincent liebart 4 months ago in reply to Ozino Odharo

Intellectual 510 points

Ozino Odharo said:
I do believe it generates symbols that map to the expected linker symbols specified in code

Hello,

First thank you for answering me. The link you sent me are interesting, and I already had a look at the C2000Ware examples.

What you said is exactly what seems not to done:

in the *.cmd file generated by SysConfig: LOAD_START(loadStart_cla1Prog)

in the CLA_init() generated by SysConfig, used by C2000Ware: extern uint32_t Cla1funcsRunStart

Is there a link between loadStart_cla1Prog and Cla1funcsRunStart ? (I looked in device.h and did not find)

Thank you for your help. I really need to understand that issue.

0 Ozino Odharo 4 months ago in reply to vincent liebart

TI__Mastermind 20642 points

Hi Vincent,

I understand your concerns. Let me redirect this question to the C2000Ware SysConfig owners to clarify how this is handled.

Regards,
Ozino

0 Veena Kamath 4 months ago in reply to Ozino Odharo

TI__Mastermind 32565 points

Hi,

As you can see in the Sysconfig generated file, it uses BINIT table. This means the copying from Flash to RAM is automatically done by cinit function. And application need not do it explicitly.

Regards,

Veena

0 vincent liebart 4 months ago in reply to Veena Kamath

Intellectual 510 points

Hello,

Your answer seems exactly what I am looking for. But I don't see this table in the generated files. Can you tell me more about that ?

Where can I find it ? where is it included to be used by CLA_init() ? Are Cla1funcsRunStart, Cla1funcsLoadStart, ... included in this table ?

Thank you.

0 Veena Kamath 4 months ago in reply to vincent liebart

TI__Mastermind 32565 points

You can see that in the .map file under Linker Generated copy tables

The symbols added using START() and END() are not used in this table. So, you dont need those symbols, if you are using copy tables.

Reagrds,

Veena

0 vincent liebart 4 months ago in reply to Veena Kamath

Intellectual 510 points

Veena,

I found le *.map file and the __TI_cinit_table table in there.

But can you tell me were this table is used to copy the code written in the FLASH into the RAM ?

I did a mistake looking at CLA_init():

I seems that the Memcpy is executed. But the parser is wrong: CMDTOOL is defined (maybe in device_cmd.opt):

Do you confirm it ?

Veena Kamath said:
So, you dont need those symbols, if you are using copy tables

Which is the right way for choosing not to use the tables ?

I really hope I do not bother you with my questions.

0 Veena Kamath 4 months ago in reply to vincent liebart

TI__Mastermind 32565 points

BINIT table contents are copied as part of cint00 function itself, before main.

You can also use your own copy table. In that case, you need to invoke copy_in function to perform the copy . If the table name used is BINIT, it is taken care as part pf cint00 function

The following appnote might be helpful.

https://www.ti.com/lit/an/spraa46a/spraa46a.pdf

Regards,

Veena

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TMS320F28379D: CLA memcpy