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Oh, for Pete's sake.

I gave one approach (calling a function that returns a pointer) in Post #4 of this thread we're in which you clearly haven't even tried to understand.

If you don't want to...

Then do something like this



/* declarations of CAN_A and CAN_B must be global, so they exist outside readPort() */

struct FLEXCAN2_tag *readPort(Port Number)
{
switch (Number)
{

Remove the const qualifier and/or return the required value from the function.

There are other possibilities (moving it to other places in the definition) but you haven't given enough information...