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,

Thanks for your input :) .

Regarding the command attribute((used, long_call, section(".data"))) , I have implemented as below. I want to put function1 into RAM.

attribute((used, long_call, section(".data"))) void function1(unsigned char *Data, uint16_t len) {

function2(Data, len);

}

When I tried to build I got the error as "(.data+0x20): relocation truncated to fit: R_ARM_THM_CALL against `function2'".

is there any thing I need to change in the linker files(I am using SDK6.1).

Sorry it looks like some basic stuff , But still I need your help to understand this.

Regards, Anand