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3d array acces bug

Vasilij German

Hello!

I declared 3d array in my Keil project for lpc1788: volatile uint16_t db[16][128][3]. When I read members of the array db[x][y][z] with z < 1 there is no problem. But if I try to read members with z >=1 I always get 0xFFFF, even if they are not equal 0xFFFF (I checked it in debugger). For example:

db[0][1][0] = 0x1515;
uint16_t id_ = db[0][1][0];       //works fine, id_ is equal 0x1515

db[1][0][1] = 0x1515;
uint16_t index_ = db[1][0][1];    //returns index_ equal 0xFFFF


Could anybody explain to me what's wrong?

Regars, Vasilij.

Parents
  • 0

    I've tried this:

            volatile short db[16][128][3];

int main (void)
{
        short test;

        db[0][1][0] = 0x1515;
        test=db[0][1][0];
        db[1][0][1] = 0x2525;
        test=db[1][0][1];
}

    and it works as supposed. Toolset was V4.50

    Beware that some other part of your code (e.g.interrupt service routine)
    might erroneously overwrite that 3D array...

    - Dejan

Reply
  • 0

    I've tried this:

            volatile short db[16][128][3];

int main (void)
{
        short test;

        db[0][1][0] = 0x1515;
        test=db[0][1][0];
        db[1][0][1] = 0x2525;
        test=db[1][0][1];
}

    and it works as supposed. Toolset was V4.50

    Beware that some other part of your code (e.g.interrupt service routine)
    might erroneously overwrite that 3D array...

    - Dejan

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