TMS570LS1227: Using the ECLK in GIO mode without generating dabort.

Gabriel B

Part Number: TMS570LS1227
Other Parts Discussed in Thread: HALCOGEN

I want to use ECLK as a GPIO.
HalCoGen is configured as follows:

I didn't find any documentation describing how to use it using HalCoGen API.

After a bit of searching, I found a comment in the reg_system.h indicates that systemPORT will control ECLK.
No comments about what pin to use, though.

My problem: The following code generated a data abort exception.

gioSetBit(systemPORT, 0, 0);

Where the exception occurs:

How do we use the ECLK ?

Regards,
Gabriel

over 2 years ago

0 jagadish gundavarapu over 2 years ago

TI__Guru 70151 points

Hi Gabriel,

Working on your issue and will provide an update soon.

--
Thanks & regards,
Jagadish.

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

TI__Guru 70151 points

Hi Gabriel,

I created one project to operate ECLK as GIO on RM46 and it worked fine at my end

I am attaching my project here, please refer its configuration and code.

2335.ECLK_AS_GIO_OUTPUT_RM46.zip

Here i set breakpoints for SET and CLR functions and verified waveform using salea logic analyzer

and i got below waveform.

So, it worked without any issue, so please refer attached project.

Thanks & regards,
Jagadish.

0 Gabriel B over 2 years ago in reply to jagadish gundavarapu

Intellectual 341 points

Hi Jagadish,

Thanks for your answer.
I think we might have the same problem that I had with the performance counter: the system port register might be in the privilege section.

Is there a way to enable user mode for the ECLK (like the _pmuEnableUserMode_ of the linked issue)?

Thanks,
Gabriel

0 jagadish gundavarapu over 2 years ago in reply to Gabriel B

TI__Guru 70151 points

Hi Gabriel,

I don't find any problem in accessing ECLK registers in user mode

As you can see i switched to user mode and i was able to access ECLK registers.

Thanks & regards,
Jagadish.

0 Gabriel B over 2 years ago in reply to jagadish gundavarapu

Intellectual 341 points

Are you using FreeRTOS (with the MPU)? Otherwise, it seems likely that you can use ECLK in user mode.

0 jagadish gundavarapu over 2 years ago in reply to Gabriel B

TI__Guru 70151 points

Hi Gabriel,

Gabriel B said:
Are you using FreeRTOS (with the MPU)?

No, i am not using FreeRTOS, my code was built on baremetal. Is your code using FreeRTOS?

0 Gabriel B over 2 years ago in reply to jagadish gundavarapu

Intellectual 341 points

My apologies: it was not clear.
I'm using the TI HalCoGen port of FreeRTOS (wich use the MPU).

0 jagadish gundavarapu over 2 years ago in reply to Gabriel B

TI__Guru 70151 points

Hi Gabriel,

Can you provide a minimal project to understand? It would be helpful to debug the issue at our end.

Thanks & regards,
Jagadish.

0 Gabriel B over 2 years ago in reply to jagadish gundavarapu

Intellectual 341 points

Hi Jagadish,

Here's a minimal project that crashes as showcased in this issue.
Let me know if you can reproduce it.

Best,

test-eclk.zip

0 jagadish gundavarapu over 2 years ago in reply to Gabriel B

TI__Guru 70151 points

Hi Gabriel,

Thanks for sharing the minimal project and i could see the issue of _dabort

Let me debug further and give update.

Thanks & regards,
Jagadish.

0 Gabriel B over 2 years ago in reply to jagadish gundavarapu

Intellectual 341 points

I'm glad you where able to reproduce the bug.
Looking forward to see the results of your investigation.

0 jagadish gundavarapu over 2 years ago in reply to Gabriel B

TI__Guru 70151 points

Hi Gabriel,

I understood the root cause for the issue, it is due to the user mode doesn't have privilege to access the system resources. As ECLK port registers comes into the system resources, if we try to write into these registers in user mode then it will create data abort exception.

The solution for this issue is to switch the mode before accessing the system port register of ECLK.

So, i modified your code as below and tested and now the program is working fine without any exceptions.

Please refer below attached project

test-eclk2.zip

Thanks & regards,
Jagadish.

0 Gabriel B over 2 years ago in reply to jagadish gundavarapu

Intellectual 341 points

Hi Jagadish,

I'm glad we observed the same behavior.
It looks like my HalCoGen doesn't generate the svc.h header file.
Do you know where to find it?

0 jagadish gundavarapu over 2 years ago in reply to Gabriel B

TI__Guru 70151 points

Hi Gabriel,

Actually i manually copy and paste that file from another project.

I too don’t have any idea how to generate that file from HalCoGen.

0 Gabriel B over 2 years ago in reply to jagadish gundavarapu

Intellectual 341 points

Hi Jagadish,

I understand.
My problem is I don't have the necessary background to assess if those functions will work as intended on my RM46.
So I'm hesitant to use them.

0 jagadish gundavarapu over 2 years ago in reply to Gabriel B

TI__Guru 70151 points

Gabriel B said:
So I'm hesitant to use them.

Understood Gabriel.

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TMS570LS1227: Using the ECLK in GIO mode without generating dabort.