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LONG Arrays in PBP 3.0.9 may have issues

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  • PBP 3.0.9 LONG Array bank-boundary vulnerability

    PBP 3.0.9 is the last version of PBP that will run on Windows XP. It also compiles large programs significantly faster than the newer versions. This post is intended as a warning and workaround for those who have reason to use version 3.0.9. This is the only known issue that could cause problems without generating a compile error. This issue is fixed in 3.0.10 and later.

    Individual LONGs are not vulnerable to this issue, only arrays. This is a rare issue that is most likely to be encountered in PIC18 programs that use most of the available ram and declare large LONG array variables.

    In 3.0.9, PBP may place LONG arrays at addresses that result in individual elements of the array spanning bank boundaries in RAM. This can cause unexpected and erroneous results when reading or writing to specific elements of the array.

    If you must use 3.0.9, manually specify hex addresses that end with 0, 4, 8, or C when you declare LONG ARRAY Variables:

    Code:
    array1 VAR LONG[100] $0100
array2 VAR LONG[100] $02A8
array3 VAR LONG[32]  $043C
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