TMS570LS1224: Usage of While loop without recovery mechanism when waiting for hardware register status read

Saravanakumar Rathinathandavam

Part Number: TMS570LS1224
Other Parts Discussed in Thread: HALCOGEN,

Hi,

I have a query related to Halcogen generated code for the TMS570LS1224 microcontroller. In all driver code, there is a while loop used for polling the hardware register status bits and breaking the loop only if the expected status bits are satisfied. There is no timeout mechanism to come out of the while loop if the hardware register bit is sticky due to a random fault in the microcontroller.

Is this functionally safe? How can we claim this a functional safe code if we don't have a recovery mechanism for random faults in the microcontroller?

Can someone clarify?

over 3 years ago

0 jagadish gundavarapu over 3 years ago

TI__Guru* 78276 points

Hi Saravana Kumar,

HALCoGen is designed to generate the basic drivers (Hardware Abstraction Layer) for an application.

And HALCoGen SW development process was certified, but the HALCOGen generated code is not certified.

(+) RM42L432: Certification of CCS Compiler (CQKIT_RV) and HALCoGen (CSP), with IEC 61508 certification available? - Arm-based microcontrollers forum - Arm-based microcontrollers - TI E2E support forums

So, it is application responsibility to build any functional safeties required. I would suggest you use watchdog for this type of requirement, if processor hung any loop the watchdog timeout will occur, and processor will get reset.

Thanks & Regards,
Jagadish.

0 Saravanakumar Rathinathandavam over 3 years ago

Prodigy 10 points

Thank you, Jagadish. We do have the watchdog safety mechanism in place. Just wanted to understand the meaning of the below-highlighted comment in the HALCOgen-generated code.

/** - Wait for buffer initialization complete */

/*SAFETYMCUSW 28 D MR:NA <APPROVED> "Hardware status bit read check" */

while (((adcREG1->BNDEND & 0xFFFF0000U) >> 16U ) != 0U)

{

} /* Wait */

0 jagadish gundavarapu over 3 years ago in reply to Saravanakumar Rathinathandavam

TI__Guru* 78276 points

Hi Saravana Kumar,

This looks like a requirement, for the tracking purpose they added this comment.

I have to check this with internal team to get back to you on this.

Thanks & Regards,

Jagadish.