[SOLVED] LCD Interfacing program

[venkates2218]

char font[][5] = {
    {0x7f, 0x08, 0x08, 0x08, 0x7f} // 48 H
    ,
    {0x7f, 0x49, 0x49, 0x49, 0x41} // 45 E
    ,
    {0x7f, 0x40, 0x40, 0x40, 0x40} // 4c L
    ,
    {0x3e, 0x41, 0x41, 0x41, 0x3e} // 4f O
};

void test_2(char *str) {
    int i, column;
    for (i = 0; str[i] != 0; i++){
        for (column = 0; column < 5; column++) {
            GLCD_Char(font[str[i] - 32][column]); 
        }
    }
}

This is the program which used to display the character in GLCD. In font array all the values are given
When an string is passed to test_2 function, the character will displayed in GLCD display based on values inside the array.
I removed -32 to understand the program.After removing 32 unrelated font are displayed in display.
What is the role of 32 here…?
I dono how the function Is working. Please explain how string choosing the values inside array function.

 

[Easyrider83]

32 is an offset where in font array the first simbol is located

 

[paulfjujo]

hello

in your case, your font is defined only for this 4 charateres HELO
so, dont' remove -32 ..
Whers is defined your string ?