S32k358 eMcem fault injection Issue

[Konstanty]

Hi, 

in our current project im trying to use the eMcem fault injection feature using eMcem_InjectFault(). Right now im only trying to inject a fault for EMCEM_DCM_NCF_5_FAULT_MONITOR0, EMCEM_DCM_NCF_5_FAULT_MONITOR1 & EMCEM_DCM_NCF_5_DBG_ACTIVATION. It seems that the fault injection is working properly. For every single fault injection, i also get the expected handler call. 

The problem, however, is that as soon as I inject even the first error, the system stops working properly. Using eMcem_GetErrors(), I can see that au32Faults[2] = 0xA00 (type eMcem_FaultContainerType). As far as I understand, these seem to be STCU_NCF (Fault 73) and STCU_BIST_USER_CF / LMBIST_USER_CF (Fault 75).

How are these all related?

What steps should be taken to ensure that the system functions properly without errors after fault injection?

Here is my code flow:

- eMcem_InjectFault(nFaultId) // inject fault

- FCCU_ALARM_ISR() // polls FCCU_ALARM_ISR until handler callback sets flag

- Check if handler has set expected flag

- eMcem_ClearFaults(nFaultId)

Thank you in advance.

[Konstanty]

Hello Daniel,

thank you for your quick response. Unfortunately, that only helps me understand why these errors occur. However, I still don't know how to clear these errors after fault injection.

Clearing individual faults, such as eMcem_ClearFaults(EMCEM_DCM_NCF_5_STCU_NCF), does not seem to have any effect. When I read the faults after clearing them, the same values are still there (au32Faults[2] = 0xA00).

How can I perform a fault injection in such a way that the system continues to function without any errors afterward?

Regards,

Konstanty

[danielmartynek · Accepted solution]

Hello Konstanty,

It has to be cleared in FCCU, try this:

status = eMcem_Fccu_ClearFault( 5 ); // This line will clear STCU2 flag
status = eMcem_ClearFaults( EMCEM_DCM_NCF_5_STCU_NCF );
status = eMcem_ClearFaults( EMCEM_DCM_NCF_5_LMBIST_USER_CF );

BR, Daniel

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[danielmartynek]

Hi @Konstanty,

This is expected, refer to the eMCEM User Manual:

Regards,

Daniel