Issue
I am developing on an ARM Cortex M3.
My IDE generates a C source file which includes an ISR vector table written in C as a struct of function pointers for ISR. By default they all have a weak alias which is the default hander.
I want to override the weak alias with an ASM function. Can I do this? I don't want to mess with the premade table, I just want to provide an ASM function to fill the name instead of using a C function, so load the ASM functions address of a given name.
Solution
Sure, just write the functions in assembly using the same symbol as the desired ISR. When a global symbol with the same name as a weak symbol exists, it replaces the weak symbol.
Answered By - fuz Answer Checked By - Marie Seifert (WPSolving Admin)