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Hello, what I would like to do is to copy a function from SRAM to flash and decide in the main if I want to execute from flash or from SRAM. What I observed it is that if this function is calling a subroutine placed in SRAM, when I execute it from flash the jump will not be set correctly: it will try to jump to a subroutine placed in flash, but this function is located in SRAM!!! What can I do to have the correct address when I execute from flash? I tried with the PI qualifiers ropi, but it does not work... I am using a device with Cortex M4
Hi,
Thank you very much for your quick answer:-) So to better explain lets' say I have the function f calling functions g and l:
void f (void) { call g; call l; }
all these functions are in SRAM, then I copied f in flash but I want that g and l are still in SRAM when I execute the code from flash. How can I do that?
Alex
No, that doesn't address the question at all:
"exactly _why_ do you want main() to decide at runtime if it should call a specific function in RAM or in flash? What problem do you hope to solve?. You are introducing lots of problems with this specific requirement."
www.catb.org/.../smart-questions.html
Hello,
This is a customer application and this requiremets was given to me by my customer. The customer wants the possibility to have a function in sram and the same in flash and to decide when to use when or the other.
Easy - make two copies of the function. One linked for RAM and one linked for flash.
Good solution? Not at all. But the customer gets what he wants - and gets to pay the price from wanting what he shouldn't.