Dear all :). I have finally gotten my 2,4" TFT touchscreen to do what I want it to (rotation etc...) and I am trying to build a menu system on it.
I have created a function for the startscreen and I load this in setup(). I am also using a variable called scrren, to indicate which screen I am showing. (will upload code once it is cleaned up a bit).
So, imagine this. In the startscreen function, I draw the buttons and I set screen = 0.
In loop() I have a simple if(screen ==0){ //check if buttons have been touched and set screen = 1 (or 2 depending on which button i touched)}
I have another if(screen == 1){ //here I draw some other buttons and will eventually check if they are touched, to do the necessary actions} which brings me to my question... When screen 1 is showing, all the buttons and text flicker (surely due to the loop refresh rate...).
Does anyone have an idea how I can let the code in loop draw the buttons etc. just once and not over and over again? Would it be easier if I moved the drawing of the buttons and text in screen 1 to a function? More like the startscreen?
Sorry if I am not making any sense, it does make sense in my head ;). Hope someone will understand it...
You'll have to post all your code to get a chance of a good answer. However, in principle, you should redraw the screen only when there is a change or an event has been detected e.g. a button being pressed, a temperature rising one degree etc. etc. Don't simply redraw it every loop iteration.
Incidentally, what screen have you purchased (post a link to it). I've just spent some time developing a navigation bar class for a 2.8 inch SPI touch screen which handles the generation of buttons on screen and the detection of button presses with call back routines.
Excellent advice people :D. I now have a few ideas and I have sorted out the flickering of screen two. Will work on the other screens/menus with your guidance in mind. Hopefully I will accomplish what I have set as my goal. Will post my code as soon as it is complete/working.
(rotation etc...) and I am trying to build a menu system on it.