TMS570LS3137: TMS570LS Privileged Mode Entry

Ali Ünsal

Part Number: TMS570LS3137
Other Parts Discussed in Thread: HALCOGEN

Hello everyone,

We have a TMS570LS3137 microcontroller. We want to use DMM port as digital output pin. But it is inside in the MPU region. Because of that we can't change DMM pin logic level.

Since the processor starts in supervisor mode when it first starts, I can see that the led connected to my DMM port is lit, that is, it gives output. However, I cannot access this pin from within any FreeRTOS task. For this I need to switch to privileged mode. I have analysed the solution here( e2e.ti.com/.../tms570lc4357-ti-fee-functions-hang-inside-the-freertos-task) before, but there are too many errors in the _svc.asm file. I think some assembly code used is not supported by IAR.
How can I solve this problem. I need to enter Privileged mode.

Thank you

Best regards

over 2 years ago

0 jagadish gundavarapu over 2 years ago

TI__Guru 70551 points

Hi Ali,

Apologies for the delay in my response.

Can you please refer the attached project in below thread:

(+) TMS570LC4357: TI Fee functions hang inside the FreeRTOS task. - Arm-based microcontrollers forum - Arm-based microcontrollers - TI E2E support forums

In this RTOS project as you can see, i just changed the mode to supervisor mode on starting of the task and again change back to the user mode after ending of the task.

Take this project as reference and do the necessary modifications on your end.

Thanks & regards,
Jagadish.

0 Ali Ünsal over 2 years ago in reply to jagadish gundavarapu

Prodigy 130 points

Hi Jagadish,

No problem thank you for your help.

I analyzed this project but this didn't work for me. The problem is _svc.asm file. A4, A3 and some assembly codes in _svc file give error. Sorry, I don't know assembly programming well enough. Because of that I don't understand this errors. I think the problem reason is IAR compiler not support this assembly instructions.

First of all, can you explain registers such as A4, A3 etc. Because I don't understand that. ARM official web site uses R0, R1 etc. registers for SVC handler in assembly.

The Errors are as above.

Sorry, I'm new in ARM architecture.

Thank you for your patient.

Best regards.

0 jagadish gundavarapu over 2 years ago in reply to Ali Ünsal

TI__Guru 70551 points

Hi Ali,

I saw one similar issue in below thread:

(+) Compile errors - new Halcogen project + IAR tools - Arm-based microcontrollers forum - Arm-based microcontrollers - TI E2E support forums

Here the compiler errors are due to the wrong mode setting, the user set the "Thumb Mode" instead of "ARM Mode", can you please verify same thing on your end as well?

And also refer the attached application notes to make sure all steps are correct.

--
Thanks & regards,
Jagadish.

0 Ali Ünsal over 2 years ago in reply to jagadish gundavarapu

Prodigy 130 points

Hi again,

I checked this settings. ARM Mode was selected, and I fixed it to the Thumb mode. But this didn't work.

I compared your assembly file and Halcogen generated file. There are some different instructions. I think problem maybe caused by this difference. Isn't it?

os_portasm.asm

sys_core.asm

I attached some difference between your assembly files and Halcogen generated for IAR Tool files.

Best regards

Thank you

Ali.

0 jagadish gundavarapu over 2 years ago in reply to Ali Ünsal

TI__Guru 70551 points

Hi Ali,

Ali Ünsal said:
I compared your assembly file and Halcogen generated file. There are some different instructions. I think problem maybe caused by this difference. Isn't it?

It could be due to those different instructions only.

Thanks & Regards,
Jagadish.

0 Ali Ünsal over 2 years ago in reply to jagadish gundavarapu

Prodigy 130 points

How can i fixed it?

Thanks

Best regards.

Ali

0 jagadish gundavarapu over 2 years ago in reply to Ali Ünsal

TI__Guru 70551 points

Hi Ali,

I never used IAR workbench before,

can you please try to change manually and see whether the errors are rectifying or not?

Thanks & regards,
Jagadish.