timer interrupt not return

123 146

Hi All
I just port azure RTOS SMP to Renesas MPU cortex-a53X2, it can run into timer interrupt ISR, but it can not return.
it stop in _tx_timer_interrupt(), not return. could you give me some advice.
Thanks

AshokPeddakotla-MSFT 27,386 Reputation points

2020-10-12T03:46:12.827+00:00

@123 Welcome to Q&A forum!
Sorry for the inconvenience caused. We are looking into this issue and update you as earliest.
Appreciate your time and patience

Also, could share the documentation which you are following for the above mentioned sample?
António Sérgio Azevedo 7,661 Reputation points Microsoft Employee

2020-10-13T11:02:38.303+00:00

Hi @123 , please help us understand the steps you are taking to be able and try to reproduce your issue. Is what you are trying under Azure RTOS github repo? https://github.com/azure-rtos

Thanks
AndresMlinar 256 Reputation points

2020-10-13T13:27:14.583+00:00

There is a version of ThreadX SMP for a ARMv8 core available here:
https://github.com/azure-rtos/threadx/tree/master/ports_smp/cortex_a35_smp
You should use that port as a starting point for Cortex-A53. Did you start from there?
Which compiler are you using?
123 146 Reputation points

2020-10-19T09:03:19.97+00:00

@ asergaz @AndrsMlinar-3450 Yes, I try Azure RTOS under github repo cortex_a35_smp

it is stuck in _tx_timer_interrupt() line 123, as the picture show, and according to my guess, the _tx_timer_system_clock pointer has not been initialized and an invalid memory address is accessed, but I don’t know how to solve this problem. Could you give me some advice? Thanks
AndresMlinar 256 Reputation points

2020-10-20T14:37:29.257+00:00

1) I am not sure what you mean by "it is stuck". Does the code loop there? Does that instruction cause an exception? What type? It means something else?
2) Have you modified the linker file to match your system? Note that the port you started from is meant for a different processor in the same broad family, it is likely that they have different memory maps.
3) In order to take ThreadX SMP from one processor example to a different processor, the most reliable way to proceed is to take a simple SMP example for the target processor and incorporate the code for ThreadX SMP into that example. Simple SMP examples normally have all the necessary C run-time initialization, interrupt controller initialization, memory controller initialization, secondary core or cores initialization, watchdog initialization (if any), and other basic code that must be in place and is processor specific. All these elements must function properly before control is passed to ThreadX.
Scott Azure RTOS 4,051 Reputation points

2020-10-20T18:35:35.19+00:00

You may also need to set up an actual hardware timer to drive the periodic timer that ThreadX requires. Note that our example projects for A5x/A35 on github all use the simulated timer provided by the ARM FVP simulator. You may want to ask Renesas for guidance on getting a hardware timer running.

2 answers

AndresMlinar 256 Reputation points

2020-10-20T14:38:25.83+00:00

Given the limited information provided, my best guess is that there is missing initialization, possibly a bad memory configuration; but the problem could be somewhere else.
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123 146 Reputation points

2020-10-26T07:06:39.41+00:00

Hi All,
I fix that problem, It is initialization problem, I just initial the ThreadX SMP first and then turn on the timer. and the interrupt return OK. Thanks
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AndresMlinar 256 Reputation points

2020-10-26T07:23:53.24+00:00

Great! Thanks for the information.

António Sérgio Azevedo 7,661 Reputation points Microsoft Employee

2020-10-26T12:05:18.48+00:00

@123 glad that your issue is now fixed :).

Could you go ahead and mark the above as answer (or add a new answer to the thread and mark it) so community members can benefit from a richer content? :)

Thank you so much.
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