TMS320F28P650DH: Finding the root of ITRAP

Hang Yang

Hi Experts,

My csutomer is seeing the device enters ITRAP interrupt. We need to find where is triggering the ITRAP, first of look at the RPC , which is 0x3654F0, this is not a RAM/FLASH address for user. They should have branched to 0x3654F0 unexpectedly.

How to trace back where their code branched to 0x3654F0?

This failure is diffcult to reproduce so we can not step through the code ot find it. Can we analysis the stack to find it? I am attaching the stack here

Regards,

Hang

10 months ago

0 Prarthan Bhatt 10 months ago

TI__Mastermind 19446 points

Hi,

Please refer to "How can I debug an ITRAP?" section from the below link

https://software-dl.ti.com/C2000/docs/c28x_interrupt_faq/html/index.html

Thanks

0 Hang Yang 9 months ago in reply to Prarthan Bhatt

TI__Expert 3896 points

Hi Prathan,

The document only ends with finding where ITRP occurs, we already know ITRP occurs at 0x3654f0, we need to find why the code is jumping to this address.

The document said:

Another option is to look at the stack. When you take an illegal instruction trap, registers are automatically pushed on the stack, including the return address. By looking at the return address value on the stack, you can find out where the ITRAP occurred.

Could you provide more details on how to look at the stack? You may find the stack screen shot above. We find the location of ITRAP by looking at RPC register, not stack, and we don't know how to analysis the stack content.

Regards,

Hang