Question

How do I locate a function at an absolute flash address in Simplicity Studio?

Answer

Simplicity Studio supports both the Keil LX51 and BL51 linkers. To select between these, go to Project Properties->C/C++ Build->Settings->General Settings->Use Extended Linker (LX51) instead of BL51.

If you check the checkbox, the LX51 linker will be selected; otherwise, BL51 will be selected.

BL51

To locate code at an absolute address with BL51, use the following command-line flag in the Linker area under Project Properties->C/C++ Build->Settings:

CODE(?PR?func?file(800H))

Where func is the function name and file is the file name where the function is located.  An example would be:

CODE(?PR?_ADD?EFM8LB1_BLINKY(800H))

LX51

To locate code at an absolute address with LX51, use the following command-line flag in the Linker area under Project Properties->C/C++ Build->Settings:

SEGMENTS(?PR?func?file(C:2000H))

Where func is the function name and file is the file name where the function is located in. An example would be:

SEGMENTS(?PR?_ADD?EFM8LB1_BLINKY(C:2000H))

int add(int a, int b)
{
   return a+b;
}

//-----------------------------------------------------------------------------
// Main Routine
//-----------------------------------------------------------------------------
void main (void)
{
   int x, y;
   add(x,y);
   while (1) {}                        // Spin forever
}