TMS320C6678 execution mode

Alban MICHELANGELI

Intellectual 270 points

Other Parts Discussed in Thread: TMS320C6678

Hello,

I currently use the TMS320C6678 DSP.

I would like to know what to do at the end of the RESET service routine in following cases :

1. Run program always in supervisor-only mode execution : - Do nothing on bits CXM of TSR register ?

- Use MVC to confirm CXM of TSR register to 0 value

- Use a dedicated ASM instruction which allows to set program in supervisor-only mode execution

2.Run program in user mode execution : - Use MVC to set CXM of TSR register to 01 value

- Use a dedicated ASM instruction which allows to set program in user mode execution

I don't find answers in DSP documentation

Regards

Alban

over 9 years ago

0 Raja over 9 years ago

TI__Guru* 81335 points

Alban MICHELANGELI,

Welcome to the TI E2E forum. I hope you will find many good answers here and in the TI.com documents and in the TI Wiki Pages (for processor issues). Be sure to search those for helpful information and to browse for the questions others may have asked on similar topics (e2e.ti.com). Please read all the links below my signature.

We will get back to you on the above query shortly. Thank you for your patience.

Note: We strongly recommend you to create new e2e thread for your queries instead of following up on an old/closed e2e thread, new threads gets more attention than old threads and can provide link of old threads or information on the new post for clarity and faster response.

0 ran35366 over 9 years ago in reply to Raja

TI__Genius 12805 points

Alban

Can you describe better what do you want to do? Can you describe your system? Do you encounter a problem? and if so, what is the problem?

Ran

0 Alban MICHELANGELI over 9 years ago in reply to ran35366

Intellectual 270 points

Hello Ran,

My problem is very simple. I want my program run always in a supervision-only mode.

My software shall be in supervisor mode inside and outside Interrupt treatments.

What is the default mode outside Interrupt treatments ?

If it is the User Mode, I would like to know what instruction must be done to set the supervisor mode outside Interrupt treatments ?

If this instruction exists, when must I run this instruction ? I suppose it must be inside the "_c_int00" reset routine

Thanks for your answers

Alban

0 ran35366 over 9 years ago in reply to Alban MICHELANGELI

TI__Genius 12805 points

Alban

C6678 default is the supervisor mode

Please look at the following e2e posting (and read it to the end)

Best Regards

Ran

https://e2e.ti.com/support/embedded/tirtos/f/355/p/303379/1057090

0 ran35366 over 9 years ago in reply to ran35366

TI__Genius 12805 points

More information:

C66x users guide has the details

www.ti.com/.../sprugh7.pdf

9.2.1 Privilege Mode After Reset
Reset forces the CPU to the Supervisor mode. Execution of the reset interrupt service fetch packet (ISFP) begins in Supervisor mode.

Section 9.4 has how to change.

But TI supports only supervisor mode

Please close the thread if this answer your question

Ran

0 Alban MICHELANGELI over 9 years ago in reply to ran35366

Intellectual 270 points

Hi Ran,

That's perfectly clear. Thanks for your answer.

I don't know how to close the thread ... I don't find any MMI for this action.

Regards

Alban

0 Raja over 9 years ago in reply to Alban MICHELANGELI

TI__Guru* 81335 points

Hi Alban,

Thank you for the update. You should create a thread with Question instead of Discussion to enable "Answer" buttons on the post.

This thread has been closed.

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TMS320C6678 execution mode