Scrolling the text on GLCD

[misnomerfrenzy]

Hi,

It seems to be a cliche to ask code help for scrolling display. But, mostly the help is available for scrolling LED display or Char LCD display.

I am using 128x64 GLCD on which we write data using column scanning. So, scrolling of data from left to right or right to left is easy and I have implemented code for it.

But, I dont know how to scroll data from down to up and vice versa.

I have declared a buffer

//u8Row max value 63; u8Column max value 128
 G_u8DisplayRAM[u8Row][u8Column];

For horizontal scorlling, I follow this method...

for(u8Index= u8StartColumn; u8Index<u8EndColumn; u8Index++)
G_u8DisplayRAM[u8Row][u8Index] = G_u8DisplayRAM[u8Row][u8Index+1];  //left to right
OR
G_u8DisplayRAM[u8Row][u8Index] = G_u8DisplayRAM[u8Row][u8Index-1]; //right to left

However, for vertical scrolling following logic cant work

for(u8Index= u8StartRow; u8Index<u8EndRow; u8Index++)
{
  for (u8Column=u8StartColumn; u8Column < u8EndColumn; u8Column++)
  {
     G_u8DisplayRAM[u8Index][u8Column] = G_u8DisplayRAM[u8Index+1][u8Column];  //up to down
     OR
     G_u8DisplayRAM[u8Index][u8Column] = G_u8DisplayRAM[u8Index-1][u8Column]; //down to up
   }
}

If possible, please let me know the algorithm or sample code which can scroll text in vertical direction

 

[misnomerfrenzy]

Any comment?