CCS/TMS320F280049: How to read RPC?

Frank Walzer

Part Number: TMS320F280049

Tool/software: Code Composer Studio

My customer asked:

I’d like to read runtime RPC register (return program counter) when a watchdog interrupt is raised and store it in a not-volatile memory before executing the corresponding reset. Is there a way to perform this?

over 6 years ago

0 Kris Parrent over 6 years ago

Intellectual 740 points

Hi Frank,

This should be do-able but I believe will require assembly. You can push the RPC onto the stack from the watchdog function, and then there are a number of assembly instructions which can manipulate the stack to get it into a register accessible by C or directly into flash.

You can use inline assembly instructions within your C code, for example

asm(" PUSH RPC");

You can view the full assembly instruction set here:

www.ti.com/.../spru430f.pdf

Regards,
Kris

0 Richard Poley over 6 years ago in reply to Kris Parrent

TI__Mastermind 27200 points

Frank,

As Kris says, this can be done through a short assembly function. This would do it:

; assembly stub to get RPC

.global _getRPC

_getRPC:
PUSH RPC
POP ACC
LRETR

Place this in an assembly file and add it to your project. You would then just "extern" the function in your C code, something like this:
extern unsigned int getRPC(void);

Please post back if you run into any issues.

Regards,

Richard

0 Richard Poley over 6 years ago in reply to Richard Poley

TI__Mastermind 27200 points

Frank,

Sorry, I realise I answered the RPC part of your question, but not the non-volatile storage part. Writing a small amount of data into internal flash is not so simple on C2000. There are a few details via this Wiki page:

I'l ask around to see if someone has more up-to-date information for your device.

Regards,

Richard

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CCS/TMS320F280049: How to read RPC?