Hi,
I have a working old code in rom 32k, I added ram code at the upper 32k and I set the hw to start form the new ram at 32k.
I want to address old function from the new ram code without modify the old project.
once I compile the project code the hex output is not the old rom hex with the new ram code.
rather it recompiled the old code to optize it and I have a new hex that is not like the old rom hex with the new additions.
The thinng is that I need to address the old code function (fixed hex in rom).
what can I do?
regards, dan
In his case, it should be possible, if that original ROM code expected to find code fragments in RAM to replace one or more of the functions in the ROM.
But it is a conceptually large difference between having a fixed program call a couple of replacement functions, and having the replacement functions becomming the new program and try to call back.
With two programs, two sets of global variables must be allocated, given initial values, ...
Next thing is that there will be two sets of CRTL functions for the same operation since the compiler will try to build a new program for stand-alone use. But if there are two copies of the same CRTL function, then there can be huge problems with the state of the two sets of global variables used by the two sets of CRTL functions.
One things leads to another in an every faster spinning spiral of disaster. Somewhere, one or more people thinks they save time/money by following that spiral.