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Altera_Forum's avatar
Altera_Forum
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10 years ago

best look up table implementation in C

Hello all,

I am doing a project that required to have a look up table for my C programming coding, i read there are several tutorial that i could refer but wish to seek for the best code efficient usage, any tips?

BR, Ray

5 Replies

  • Altera_Forum's avatar
    Altera_Forum
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    did you manage to try out? you can either just print out the data for checking or use a debug to view those variable create..

  • Altera_Forum's avatar
    Altera_Forum
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    Yeap, initial testing looks good.... any way to optimize this to use lower memory? I'm using a MAX 10 here,,, limited resources.

  • Altera_Forum's avatar
    Altera_Forum
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    how huge is your looks up table? I believe still able to fit in your MAX10.

  • Altera_Forum's avatar
    Altera_Forum
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    You may check this

    Code:

    
    # define NUMBER_OF_ROWS 5
    # define NUMBER_OF_COLS  4
    static int myArray =
    {
    {5, 10, 15, 20},
    {12, 10, 8, 8},
    {24, 22, 20, 18},
    {34, 32, 30, 29},
    {46, 43, 43, 43}
    };
    void main(void)
    { int i, j;
    printf("\n The contents of myArray are:\n");
    for (i = 0; i < NUMBER_OF_ROWS; i++)
    { for(j = 0; j < NUMBER_OF_COLS; j++)
    printf("%5d", myArray);
    printf("\n");
    }
    }
    

    But, since your rows and colums are not in sequence, so you may have either full lookup table (10 rows, 20 colums) or you need to divide your X and Y by specific value (rows divide by 2, colums divide by 5) to access the table