Mega 2560 + ili9341 + Utouch library - always points 0, 319

Other Hardware Displays
1

Hi, I have two Arduino Mega boards:

  1. ARDUINO MEGA 2560 R3 ATmega 2560
  2. MEGA2560 ATmega 2560 CH340 ARDUINO

I don't know if they are the same boards but the second were cheaper and the same seller has two of them.
When I run simple example from Utouch board 1) works fine, board 2) behaves upredicteably.

void setup()
{
  Serial.begin(9600);
 Serial.println("*******");
  myTouch.InitTouch(PORTRAIT);
  myTouch.setPrecision(PREC_MEDIUM);
 
}

void loop()
{
  while (true)
  {
    if (myTouch.dataAvailable())
    {
      myTouch.read();
      x=myTouch.getX();
      y=myTouch.getY();
      
      Serial.println(x);  
      Serial.println(y); 
      Serial.println("*******");
  
      }
    }
  }

I started playing with /hardware/*/inc files:

word UTouch::touch_ReadData()
{
	word data = 0;

	for(byte count=0; count<12; count++)
	{
		data <<= 1;
		digitalWrite(T_CLK, HIGH);
				 delayMicroseconds(200); //// added to get more stable readings???
		digitalWrite(T_CLK, LOW);
		   delayMicroseconds(200); //// added to get more stable readings???
		if (digitalRead(T_DOUT))
			data++;
	}
	return(data);

Coordinates are more accurate.

After some touching it breaks down (after some touching it always points -1, -1):

(29, 49)
(36, 46)
(-1, -1)
(31, 37)
(-1, -1)
(-1, -1)
(43, 292)
(-1, -1)
(21, 284)
(-1, -1)
(19, 282)
(-1, -1)
(15, 284)
(-1, -1)
(140, 280)
(141, 277)
(155, 302)
(-1, -1)
(-1, -1)
(-1, -1)
(-1, -1)
(-1, -1)
(-1, -1)
(-1, -1)
(-1, -1)
(-1, -1)
(-1, -1)
(-1, -1)
(-1, -1)
(138, 33)
(-1, -1)
(-1, -1)
(-1, -1)
(-1, -1)
(136, 36)
(-1, -1)
(138, 37)
(135, 34)
(137, 38)
(-1, -1)
(135, 38)
(-1, -1)
(138, 37)
(-1, -1)
(137, 35)
(-1, -1)
(-1, -1)
(-1, -1)
(-1, -1)
(132, 260)
(-1, -1)
(-1, -1)
(-1, -1)
(-1, -1)
(-1, -1)
(-1, -1)
(...... endless -1, -1) no matter when I touch it
2

I spent two days trying to solve the problem I guess I have to buy second Mega board? Maybe someone has some other ideas?

3

Strange as it may seem today it is working fine on PREC_LOW, I am wondering for how long..
Besides PREC_MEDIUM seems to be too high and it works rarely. Do you know how to adjust utouch work to be between PREC_MEDIUM and PREC_LOW?