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Function pointer with code banking

Niraj Patel

Hi
I am using Keil compiler for 8051 development.
i use function pointer throught in my program using code banking. i have 512 k of external ROM with 32 k of 16 banks defined.

i went through web and come to know that function pointer can be used with code banking but the condition is that all related files need to be kept in common area or same bank.

and also use OVERLAY.

now i have problem that it is pretty much difficult to keep all related function pointer files in one bank.

i have too many files which gives code overflow if i keep them in same bank.

please reply as soon as possible
and also explore more this OVERLAY with this function pointer and code banking.

regards
Have a nice day
Niraj Patel

Parents
  • 0 in reply to Drew Davis

    uVision already has a feature that can tell you most of this kind of thing. The source browser creates a database of functions and callers and callees.

    To view it...

    1. Make sure that Browse Information is enabled in the Options For Target - Output tab. Then, re-build your project.
    2. Select Source Browser from the View Menu.
    3. Select Functions from the Browser Window. This shows all the functions in your program. Click on the Uses column to sort by the number of times the function is called.
    4. Right-click on a function to change the display to show the call tree or the caller tree for that function.
    You can use the information from the source browser to figure out which functions to locate in the common area and which functions to locate in code banks.

    Note that deciding which functions go where is a difficult problem that is not easy to automate. Besides, the automation would probably fail more often than not. So, untimately, it is up to the developer.

    Jon

Reply
  • 0 in reply to Drew Davis

    uVision already has a feature that can tell you most of this kind of thing. The source browser creates a database of functions and callers and callees.

    To view it...

    1. Make sure that Browse Information is enabled in the Options For Target - Output tab. Then, re-build your project.
    2. Select Source Browser from the View Menu.
    3. Select Functions from the Browser Window. This shows all the functions in your program. Click on the Uses column to sort by the number of times the function is called.
    4. Right-click on a function to change the display to show the call tree or the caller tree for that function.
    You can use the information from the source browser to figure out which functions to locate in the common area and which functions to locate in code banks.

    Note that deciding which functions go where is a difficult problem that is not easy to automate. Besides, the automation would probably fail more often than not. So, untimately, it is up to the developer.

    Jon

Children
  • 0 in reply to Jon Ward

    The fundamental limitation that I find with the Sourec Browser is that there's no way to export any results from it. :-(
    It all has to be done interactively in the GUI - and is all lost when you close the GUI. :-(


    MSVC used to have a command-line tool for querying their browser database ("bscdump", IIRC) - something like that would be really useful!

  • 0 in reply to Jon Ward

    hi
    for this function pointer with code banking problem ,i come to know that OVERLAY directive can Generate table which has return address of function pointers.

    so any body know how to set this OVERLAY directive in keil?

    regards
    Niraj