X-CUBE-STL on ThreadX

Question

X-CUBE-STL on ThreadX

embdev 21

Hello,

For a safety-critical application, is there any example code or application note on how to integrate X-CUBE-STL with ThreadX? Kindly note that X-CUBE-STL must be executed with privileged level. Is it required or recommended to use 'ThreadX Modules' in order to isolate STL code from other application code? Please advise.

https://www.st.com/en/embedded-software/x-cube-stl.html

AshokPeddakotla-MSFT 35,971 Reputation points Moderator

2022-08-08T04:24:35.753+00:00

@embdev Welcome to Microsoft Q&A forum!

Thanks for your query. Community SME's on this topic or our team will review your scenario and circle back at the possible earliest time.
Scott Azure RTOS 4,051 Reputation points

2022-08-08T15:13:58.34+00:00

ThreadX Modules does not have any safety certifications, but it does provide memory protection. If you intend to use a certified version of ThreadX, you will need to get the Modules portion certified along with your application. We do not have any example or app note for safety-critical with X-CUBE-STL. I recommend you contact ST regarding this question.
embdev 21 Reputation points

2022-08-08T17:16:30.12+00:00

Hi again,

For ThreadX Modules, is there any plan for certification for the future? If not, do you provide a safety manual and test reports to simply the cerfification along with customer application?

Without modules, is there any way to isolate safety-critical tasks from non-safety tasks using only ThreadX? Our FuSa target is IEC 61508.

Thanks.

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AshokPeddakotla-MSFT 35,971 Reputation points Moderator

2022-08-08T04:24:35.753+00:00

@embdev Welcome to Microsoft Q&A forum!

Thanks for your query. Community SME's on this topic or our team will review your scenario and circle back at the possible earliest time.
Scott Azure RTOS 4,051 Reputation points

2022-08-08T15:13:58.34+00:00

ThreadX Modules does not have any safety certifications, but it does provide memory protection. If you intend to use a certified version of ThreadX, you will need to get the Modules portion certified along with your application. We do not have any example or app note for safety-critical with X-CUBE-STL. I recommend you contact ST regarding this question.
embdev 21 Reputation points

2022-08-08T17:16:30.12+00:00

Hi again,

For ThreadX Modules, is there any plan for certification for the future? If not, do you provide a safety manual and test reports to simply the cerfification along with customer application?

Without modules, is there any way to isolate safety-critical tasks from non-safety tasks using only ThreadX? Our FuSa target is IEC 61508.

Thanks.

Answer 1

Scott Azure RTOS 4,051

We don't have plans right now to certify Modules, but that may happen in the future. The safety manual comes with the certifications - these cost extra (see FAQ question here: https://azure.microsoft.com/en-us/pricing/details/rtos/#faq)

ThreadX without Modules doesn't do any memory isolation.
You can manually set up your MMU/MPU and put safety-critical threads in one section of memory and the rest in another memory section.

Answer 2

embdev 21

Is there any ThreadX example demonstrating isolation of memory regions by setting up MPU manually for Cortex M4/M7?

Are all Azure RTOS threads executed with privileged level instead of user level, aren't they? Because the STL requires privileged mode execution. It also run tests on FPU registers. Is any ThreadX setup needed for FPU?

Scott Azure RTOS 4,051 Reputation points

2022-08-09T15:30:59.723+00:00

We don't have any examples of manually setting up the MPU.

By default, ThreadX operates in privileged mode.

With ThreadX Modules, modules run in user mode. Based on your requirements, it sounds like you ought to use Modules.

ThreadX does manage FPU register context saving/restoring. There is nothing you need to do (other than perhaps enable the FPU at startup).

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X-CUBE-STL on ThreadX

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