Screen Saver effect with 2.8" TFT Shield Arduino

[KippyG]

Hi all,

I'm looking for some guidance.

I've been able to easily cycle trough bmps with Adafruit's TFT Shield for the Arduino, and easily draw geomtric shapes.

I'd like to cycle through bmps but if the screen is pressed, instantly shift to another bmp (like a menu screen).

Right now, I'm cycling through 5 bmps after each bmp is display I delay for about 2 seconds. The only time I detect a screen press is after that 2 second delay. I'd like to have some kind of interrupt that ignores the delay and instantly goes to the menu.

Any guidance is appreciated.

Thanks,

[John_Rickey]

Are you using a delay(2000) statement to create the 2 second delay? If so, try replacing that with something like:

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unsigned long timeUpdated

void UpdateScreen() {
  ...  // get and draw the bitmap
  timeUpdated = millis()   // on the line following the screen update
}

loop() {
  ....
  if (millis() - timeUpdated) >= 2000) UpdateScreen();
  ...
}

That should continue cycling through the loop, enabling you to poll the touchscreen on every loop.

[KippyG]

John,

Thanks for the guidance, since I was using

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delay (2000);

I implemented a solution close to your recommendation.

The

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timeUpdated

vairable updates every time the

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UpdateScreen

is called so I was not getting past the first image.

I ended up setting timeUpdate at the exit of the setup function for each if structure of the images I used something similar to:

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if ((millis() - timeUpdated) >= 2000 && (millis() - timeUpdated) <= 4000){
      bmpDraw("image1.bmp", 0, 0);
    }

I would change the 2000 and 4000 for each image to an appropriate time.

At the end of cycling through the 5 images I would change

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timeUpdated

to the current

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millis()

Thanks!