topic Re: Function Pointer Table in FLASH in CodeWarrior for MCU

Function Pointer Table in FLASH

DustyStew — Fri, 25 Mar 2011 05:38:48 GMT

I'm using Codewarrior 5.9.0, coding in C for the HC9S08AW32

In my program, I use a table of function pointers. The table is declared like this:

#pragma CONST_SEG DEFAULT

const void ((*functions[NUM_FUNCTIONS])(void)) =

{

function1,

function2,

function3

};

And the functions are called like this:

functions[i]();

This works fine but the function table is allocated into RAM. Can I get that table to be stored in FLASH?

THX

DustyStew — Fri, 25 Mar 2011 06:21:47 GMT

I seem to have worked it out

const void ((* const functions[])(void))

CompilerGuru — Fri, 25 Mar 2011 11:40:22 GMT

Yes, exactly.

Probably the void's do not need to be const protected:

void ((* const functions[])(void))={....};

As always with C function pointers, it gets a lot more readable with a typedef:

typedef void (* FunctionPointers) (void);

const FunctionPointers functions[] = {...};

Daniel