TMS320F280049: unintentional nested interrupt

HS FAE Germany

Part Number: TMS320F280049

Hello,
customer gets unintentional nested interrupts in his ADC interrupt routine from timer 1 interrupt. Reason is that he used DINT(), EINT() in some sub functions because of protection reasons. How can he prevent this?
Can he set IER=0 at the beginning of his ADC interrupt routine?
If yes, must he save IER register to recover it at the end of the ADC interrupt routine? Or is the IER automatically recovered by the HW?

Regards, Holger

over 4 years ago

0 tlee over 4 years ago

TI__Guru 62975 points

Holger,

I would recommend reviewing this article for intentional interrupt nesting to see if it provides enough information to answer some of the questions.

-Tommy

0 HS FAE Germany over 4 years ago in reply to tlee

TI__Mastermind 31690 points

Hello Tommy,

I know the article. In this case customer don't want nested interrupts but has to enable the INTM. We can discuss offline or per video call if you like.

Regards, Holger

0 Vince over 4 years ago in reply to HS FAE Germany

TI__Mastermind 19795 points

Hi Holger,

Thanks for your question! IER is automatically restored on return from an ISR, so the customer does not need to store the IER state of the device when wanting to change it.

Only the PIEIER bits are not restored automatically, so if those get modified at all, they must be stored and then restored manually.

Let me know if that clears up the issue for you!

Regards,

Vince

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TMS320F280049: unintentional nested interrupt