I want to produce coloured diagrams on the mini2440 LCD (actually to develop a portable oscilloscope). It now strikes me that Qtopia may not be the answer since that is mainly concerned with icons and buttons etc. Is it possible to program in C to generate images on the LCD?
What frequency do you hope to be able to get up to? 10kHz? 10MHz? Resolution? Yes, you can program pixel by pixel in C if you want to do it the hard way. Why not look at some plotting utilities http://www.gnu.org/software/plotutils/ Maybe, the DirectFB project http://www.directfb.org/ Give some more detail about what you are trying to do and maybe, more helpful answers will come.
Maybe try the SDL Lib... it can simple crosscompiled and used....
Thanks davef and andreas for your suggestions which look useful. However, my question is rather more basic. I am just starting with the mini2440, and can write and cross-compile C programs which run on the mini2440 linux. How can I make the LCD screen do anything, such as change colour or draw a line? I have run the test program and the screen picture is fine, but how do I program in C to produce a result?