i would like to explain the problem a bit further. i've no problem in displaying the data once i get it. But the data is dynamically updated. It is downloaded from the PC to XRAM. So while scrolling backwards, I don't know what location the first character should start.
For e.g. lets say that the XRAM contains data at locations from 1 to 100.
1) Display Screen I:- 1 - 23 characters. ('n' at the 24th character , so fill the 24th to 32nd characters with space on LCD).
2) Display Screen II:- 25 - 50 characters. ('n' at the 51st character)
and so on.
Now if am in say 8th screen, how do i know the characters in the previous screens, i.e. the 7th or 6th screens. Ok, if i don't use the n formatting, no problem, i have fixed 32 characters per screen so i've to go 64 characters back and i get the previous screen.
Hope u got it.
p.s.: Mr Mahmood, this is not a homework and i'm not lazy to ask u to do my work. i've already finished 7 KBytes of code in this project and now i'm really stuck up at this point. with this, i'll be finishing the coding.
Thanks Mr. Steve, could u please explain a bit more about storing the length and how to use this data?
Regards.............