[FAQ] TMS570LC4357: i want to read stack pointer in SW

Hi Manoraj,

Actually R13 of the core register will act as a stack pointer.

But the problem is TI CGT compiler will not support to directly copy the core register values to variables. And i also didn't found any code related to this in the past.

So, i did one method myself to do this. Here it is:

Here what i am doing is, i just declared one register variable, and i am indirectly copying R13 register value to that register variable. Once i moved value to that register variable then i can copy it again to any required variable.

You might confused here that, how would i know the register corresponds to the register variable, actually i didn't know that initially. I just did a debug one time and i saw the register for the variable Stack_Pointer_Temp in debug window and i stopped debug and i added the instruction below later

__asm__ volatile(" MOV R0, R13 \n");

So, it might or might not be same register in your case, you also should need to do a dummy debug to find out the register assigned to the "Stack_Pointer_Temp".

I am attaching my code for your reference:
Stack_Pointer_Value_Copying_to_Variable_LC4357.zip

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Thanks & regards,
Jagadish.