128X64 Graphical LCD foant size

[samic45mit1]

I am using 128X64 GLCD (KS0108) with ATMEGA32 Micro controller and I using lib given on link https://en.radzio.dxp.pl/ks0108/ for same. I successfully interface it with atmega32 but when I try to change font size 5X8 to 12X16 (TABLE FOR 12x16 IS ALREADY GIVEN IN HEADER) in below function by changing value of i loop to 12 and (12*charToWrite) but I not gatting any result.

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Code C - [expand]
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void GLCD_WriteChar(char charToWrite)
{
   int i 
   
    charToWrite -= 32; 
    for(i = 0; i < 5; i++) 
         GLCD_WriteData(GLCD_ReadByteFromROMMemory((char *)((int)font5x8+(5 * charToWrite) + i))); 
         GLCD_WriteData(0x00);
}

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So please tell what is wrong.

 

[xpress_embedo]

Can you show us what did you write exactly to use the bigger fonts.

I think something more than this needs to be done, as the fonts you are trying to use bigger than the page size and that will affect this.

 

[samic45mit1]

This is the change I made in above function
void GLCD_WriteChar(char charToWrite)
{
int i

charToWrite -= 32;
for(i = 0; i < 12; i++)
GLCD_WriteData(GLCD_ReadByteFromROMMemory((char *)((int)font12x16+(12 * charToWrite) + i)));
GLCD_WriteData(0x00);
}

 

[FvM]

Each 16 pixel column will occupy two bytes, so the code can hardly work.

 

[samic45mit1]

So what to change in program for correct working

 

[doraemon]

Hello!
You will need to rearrange your data in 2 rows. On most of the small graphic LCDs, 1 byte writes a column
of 8 pixels. So you need to write the upper part of your character on one 8-pixel band, and the lower part
on the next 8-pixel band.
Nothing complicated, just some index manipulation.
Pascal