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Thread: Problems with In-Application-Programming of Data-Flash with extended Code Memory

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    New Member New Member RomanBauer is on a distinguished road
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    Nov 2016

    Problems with In-Application-Programming of Data-Flash with extended Code Memory


    I need to store and erase parameter data via In-Application-Programming in the XC886 32kB Flash Device.

    Moreover I have a lack of code memory. So I use 7kB of the Data-Flash as additional code memory.
    This works fine. So the Code is executed well, independent if it is stored in the Program-Flash-Banks (0x0000…0x5FFF)
    or in D-Flash-Bank 1 or in D-Flash-Bank 0.

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    If only D-Flash-Bank 1 is written with Code-Memory (till 0x6FFF), everything works fine. I can erase and write to the flash
    without problems.

    The point is: If D-Flash-Bank 0 is written with Code-Memory, the In-Application-Programing-functions don’t work anymore.
    Sometimes I can’t erase the parameters (the function stays in an endless loop) and writing to the flash works.
    Sometimes I can’t write to the flash and erasing works.

    (Note: I am sure that the code memory is not in the sectors which I use as data and I am sure that I do not erase
    or overwrite code memory)

    I have attached a file with the Flash-functions I use. I relocated these functions via linker instructions to different places
    in the code memory (0x7800, 0x6800, 0x5800, 0x2800, 0x2200). On some of these places the
    In-Application-Programing-functions work again, but if I add or remove e.g. 100 Bytes of code, I have the same error.

    Has anybody an idea?

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