How to deal with T_IRQ pin ?

[eagl1]

Hi,

I've done a simple touch tft task manager, and I tried both polling and interrupt.

I read in one of the threads here that even polling the touch functionality will pull the T_IRQ pin to LOW state.

So, if I understood that correctly, then I think both polling and interrupt are similar because both methods will pull the T_IRQ pin to LOW state.

I want to know the correct/efficient way to use each method, I will post my idea of using both methods taking into the consideration locking the touch read function to prevent the next unwanted touch readings.

I wanted to design two functions for Polling and Interrupt, but I think this one might work for the two methods.

uint8_t read_button(button &b){
  uint16_t x, y;
  uint8_t touch_state;

  if(!tft_obj.tftTouchLock){
    touch_state = tft.getTouch(&x, &y, 150);
    if(!touch_state){return;} // there's no touch event, exit the function
    tft_obj.tftTouchLock = 1; // if there's touch event, lock the function
    b.buttonTimer = millis();

    if(x > b.x && x < b.x + b.w && y > b.y && y < b.y + b.h){
      tft.drawRect(b.x, b.y, b.w, b.h, TFT_YELLOW);
      return b.index;
    }
    else{
      return NOT_SELECTED;
    }
  }
}

void tft_touch_timer(void){
  if((millis() - b.buttonTimer > 20) && (tft_obj.tftTouchLock)){
    tft_obj.tftTouchLock = 0;
  }
}