inline assembler

[Anton]

Good day,

I try to add inline assembler like this:

asm("POP {R12,PC}");

but I have an error:

  Error[Og006]: Error in inline assembly: "Error[401]: Operand syntax error"

I have read that I should change the processor mode in code settings in IAR but I can`t do it because it is gray and unchangeable. How can I solve the problem?

[Susheel Nuguru]

This is not a Nordic related question, This is purely ARM related.

Please read the post about push and pop here

You cannot use registers after R7 in these operations

3.4.6. PUSH and POP
Restrictions In these instructions:

• reglist must use only R0-R7.
• The exception is LR for a PUSH and PC for a POP.

change your asm to asm("POP {R7,PC}"); and it should work.