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In my application, I want to easily change address of SFR include user's commands. Such as: sbit ram_en=P1^0; ...... /*In another place, I want to change ram_en to P1^2 dynamiclly.*/ I am try to do this(not definition field) in my code: ... sbit ram_en=P1^2; .... But it can not pass when compiling. So, how can I implement this function? Best regards!
"2) Step back from the bits, and just read the whole port byte." But he also wants the port number to be run-time configurable - not always P1! So he'd have to do this in conjunction with (3).
I missed that requirement. There are no pointers to SFRs possible in the 8051 architecture. So, yes, you'd need another level of dispatching for the port byte:
if (ReadCurrentPort() & my_mask)
I have one idea to make some C51 learning system that user can directly modify some interface definition from console So, you are going to make a learning system that makes the "student" learn methods that are not possible in real life. Please keep us informed as to who learns from it so we can avoid hiring them. Thanks Erik