How to execute code from RAM on nRF51 using GCC Environment

[Anand Ramashetty]

How to execute code from RAM on nRF51 using GCC Environment

[Håkon Alseth]

Hi,

You can place a function in RAM in GCC like this:

__attribute__((used, long_call, section(".data"))) void some_func(void)
{
  do_something();
}

Then you should check the .map file to see that it's located somewhere in RAM (0x2000XYZZ)

Cheers, Håkon

[Anand Ramashetty]

Hi Håkon,

I just put the adverise_init into RAM to test whether attribute((used, long_call, section(".data"))) command will work or not. Right now I am thinking about what are the functions i can run from the RAM. Do you have any document or can you share some information about what are the functions in general/softdevice calls i can move it to RAM, So that i can achieve the maximum power optimization.

Note: The reason i am trying to execute code from RAM instead of flash is to optimize the power. When i check the nRF51822 version 3.1 product specification doc , i found there is 1.7 mA current consumption difference between Flash and RAM code execution.

Regards, Anand