Hello everyone
I am trying to build a mini oscillator with an arduino Uno and a TFT LCD like this one.
and I want to find a way to have a standard background.
could anyone help me out?
A standard background on the TFT display ?
What do you mean by that ? A bitmap which is always displayed ? A fixed colour or what ?
Since this display uses a derivative of the Adafruit libraries, look here for ideas about how to control it: Overview | Adafruit GFX Graphics Library | Adafruit Learning System
I guess that I wasn't that clear, but your answer almost solved my problem, I guess what I need is a bitmap that will not be affected by setting the background to black or the input signal.
I havent use any bitmap yet and i guess that I am going to need an sd card right?
Realize that both the LCD and the SD card data rates are hopelessly slow compared with a PC.
The Arduino UNO doesn't have enough memory to keep the whole background in memory, so you can't just write the background over the top of the things you want to erase/move. Opening the SD card and re-reading the bitmap line-by-line is going to be impossibly slow.
It's easiest if the background is defined mathematically. A gradient that changes from blue to orange down the screen is easy to compute - erasing any pixel by writing the background color can be done very quickly just by knowing the coordinates of the pixel. Try to keep the maths in integers as the integer calculations are so much faster than floating-point and speed will be very important when manipulating pixels.