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Author Topic: ITDB02-3.2WD -Touch Not Working  (Read 3108 times)
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I have a ITDB02-3.2WD - 3.2" Widescreen TFT LCD Screen Module with SD and touch screen & the ITDB02 Arduino MEGA Shield.

I have programmed it to do all the things I want except the Touch functions. I thought I would start with the the Touch calibration.

I have made the required changes to the calibration code & the libraries, the code compiles, uploads & displays the startup screen as per the picture. It says "Touch Screen to Continue" I do that but nothing happens, nothing at all. I have search through the forum but cannot find any clues to what might be wrong.

Can anyone help me?



Code:
// ITDB02_Touch_Calibration (C)2010 Henning Karlsen
// web: http://www.henningkarlsen.com/electronics
//
// This program can be used to calibrate the touchscreen
// of the ITDB02 modules.
// This program requires the ITDB02_Graph library (8bit mode)
// or ITDB02_Graph16 (16bit mode).
//
// It is assumed that the ITDB02 module is connected to a
// ITDB02 Shield, a ITDB02 Mega Shield or that you know how
// to change the pin numbers in the setup.
//
// Instructions will be given on the display.
//

// Remember to change the next line if you are using as 16bit module!
#include <UTFT.h>
#include <ITDB02_Touch.h>

// Declare which fonts we will be using
extern uint8_t SmallFont[];

UTFT myGLCD(ITDB32WD,38,39,40,41);
ITDB02_Touch  myTouch(6,5,4,3,2);

int cx, cy;
int rx[10], ry[10];
float px, py;
int ox, oy;

void setup()
{
  myGLCD.InitLCD(PORTRAIT);
  myGLCD.clrScr();
  myGLCD.setFont(SmallFont);

  myTouch.InitTouch(PORTRAIT);
  myTouch.setPrecision(PREC_LOW);
}

void drawCrossHair(int x, int y)
{
  myGLCD.drawRect(x-10, y-10, x+10, y+10);
  myGLCD.drawLine(x-5, y, x+5, y);
  myGLCD.drawLine(x, y-5, x, y+5);
}

void readCoordinates()
{
  int iter = 2000;
  int cnt = 0;
  unsigned long tx=0;
  unsigned long ty=0;
  boolean OK = false;
 
  while (OK == false)
  {
    while (myTouch.dataAvailable() == false) {}
    while ((myTouch.dataAvailable() == true) && (cnt<iter))
    {
      myTouch.read();
      tx += myTouch.TP_X;
      ty += myTouch.TP_Y;
      cnt++;
    }
    if (cnt>=iter)
    {
      OK = true;
    }
    else
    {
      tx = 0;
      ty = 0;
      cnt = 0;
    }
  }

  cx = tx / iter;
  cy = ty / iter;

}

void calibrate(int x, int y, int i)
{
  myGLCD.setColor(255, 255, 255);
  drawCrossHair(x,y);
  readCoordinates();
  myGLCD.setColor(80, 80, 80);
  drawCrossHair(x,y);
 
  rx[i]=cx;
  ry[i]=cy;
  while (myTouch.dataAvailable() == true)
  {
    myTouch.read();
  }
}

void waitForTouch()
{
  while (myTouch.dataAvailable() == true)
  {
    myTouch.read();
  }
  while (myTouch.dataAvailable() == false) {}
  while (myTouch.dataAvailable() == true)
  {
    myTouch.read();
  }
}

void startup()
{
  myGLCD.setColor(255, 0, 0);
  myGLCD.fillRect(0, 0, 239, 13);
  myGLCD.setColor(255, 255, 255);
  myGLCD.setBackColor(255, 0, 0);
  myGLCD.drawLine(0, 14, 239, 14);
  myGLCD.print("ITDB02 TOUCH CALIBRATION", CENTER, 1);
  myGLCD.setBackColor(0, 0, 0);
 
  myGLCD.print("INSTRUCTIONS", CENTER, 30);
  myGLCD.print("Use a stylus or something", LEFT, 50);
  myGLCD.print("similar to touch as close to", LEFT, 62);
  myGLCD.print("the center of the highlighted", LEFT, 74);
  myGLCD.print("crosshair as possible. Keep as", LEFT, 86);
  myGLCD.print("still as possible and keep", LEFT, 98);
  myGLCD.print("holding until the highlight is", LEFT, 110);
  myGLCD.print("removed. Repeat for all", LEFT, 122);
  myGLCD.print("crosshairs in sequence.", LEFT, 134);
  myGLCD.print("Further instructions will be", LEFT, 158);
  myGLCD.print("displayed when the calibration", LEFT, 170);
  myGLCD.print("is complete.", LEFT, 182);
  myGLCD.print("Do NOT use your finger as a", LEFT, 206);
  myGLCD.print("calibration stylus or the", LEFT, 218);
  myGLCD.print("result WILL BE very imprecise.", LEFT, 230);
  myGLCD.print("Touch screen to continue", CENTER, 305);

  waitForTouch();
  myGLCD.clrScr();
}

void done()
{
  myGLCD.clrScr();
  myGLCD.setColor(255, 0, 0);
  myGLCD.fillRect(0, 0, 239, 13);
  myGLCD.setColor(255, 255, 255);
  myGLCD.setBackColor(255, 0, 0);
  myGLCD.drawLine(0, 14, 239, 14);
  myGLCD.print("ITDB02 TOUCH CALIBRATION", CENTER, 1);
  myGLCD.setBackColor(0, 0, 0);
 
  myGLCD.print("CALIBRATION COMPLETE", CENTER, 30);
  myGLCD.print("To use the new calibration", LEFT, 50);
  myGLCD.print("settings you must edit the", LEFT, 62);
  myGLCD.setColor(160, 160, 255);
  myGLCD.print("ITDB02_Touch.cpp", LEFT, 74);
  myGLCD.setColor(255, 255, 255);
  myGLCD.print("file and", 136, 74);
  myGLCD.print("change the following values.", LEFT, 86);
  myGLCD.print("The values are located right", LEFT, 98);
  myGLCD.print("below the opening comment in", LEFT, 110);
  myGLCD.print("the file.", LEFT, 122);
  myGLCD.print("PixSizeX", LEFT, 158);
  myGLCD.print("PixOffsX", LEFT, 170);
  myGLCD.print("PixSizeY", LEFT, 182);
  myGLCD.print("PixOffsY", LEFT, 194);
  myGLCD.print("Connected module:", LEFT, 250);
  myGLCD.drawLine(0, 155, 239, 155);
  myGLCD.drawLine(0, 209, 239, 209);

  myGLCD.printNumF(px, 2, 100, 158);
  myGLCD.printNumI(ox, 100, 170);
  myGLCD.printNumF(py, 2, 100, 182);
  myGLCD.printNumI(oy, 100, 194);
  if (px>=0)
    myGLCD.print("2.4\"", 144, 250);
  else
  {
    if (py>=0)
    {
      myGLCD.print("3.2\"", 144, 250);
      myGLCD.print("Negative numbers for PixSizeX", LEFT, 270);
      myGLCD.print("is expected :)", LEFT, 282);
    }
    else
    {
      myGLCD.print("3.2\" Wide", 144, 250);
      myGLCD.print("Negative numbers for PixSizeX", LEFT, 270);
      myGLCD.print("and PixSizeY are expected :)", LEFT, 282);
    }
  }
}

void loop()
{
  startup();
 
  myGLCD.setColor(80, 80, 80);
  drawCrossHair(10,10);
  drawCrossHair(10,160);
  drawCrossHair(10,309);
  drawCrossHair(120,10);
  drawCrossHair(120,160);
  drawCrossHair(120,309);
  drawCrossHair(229,10);
  drawCrossHair(229,160);
  drawCrossHair(229,309);
 
  calibrate(10, 10, 0);
  calibrate(10, 160, 1);
  calibrate(10, 309, 2);
  calibrate(120, 10, 3);
  calibrate(120, 160, 4);
  calibrate(120, 309, 5);
  calibrate(229, 10, 6);
  calibrate(229, 160, 7);
  calibrate(229, 309, 8);
 
  px = ((float(rx[0]+rx[1]+rx[2])/3)-(float(rx[6]+rx[7]+rx[8])/3))/220;
  if (px>=0)
    ox = (((rx[6]+rx[7]+rx[8])/3))-(px*10);
  else
    ox = (((rx[0]+rx[1]+rx[2])/3))+(px*10);

  py = ((float(ry[0]+ry[3]+ry[6])/3)-(float(ry[2]+ry[5]+ry[8])/3))/300;
  if (py>=0)
    oy = (((ry[2]+ry[5]+ry[8])/3))-(py*10);
  else
    oy = (((ry[0]+ry[3]+ry[6])/3))+(py*10);
   

  done();
  while(true) {}
}
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It appears the Touch screen works as I stumbled on  a file (_16_9LCDTest) that has code to demonstrate handwriting on the screen. The code sets all the parameters within the code & doesn't use "#include", so at least the hardware seems fine, when you touch the screen the dots appear.

I still have no idea what is stopping the other code from working.



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Any help is good help  smiley-lol
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Hi there,

Im sorry i can't help but im just wondering where you got that handwriting sketch from and libraries for it?

Thanks alot
Mitch
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You got my hopes up there for a while, seems nobody knows the answer to my problem.

The libraries etc come from http://henningkarlsen.com/electronics/library.php?id=35.

I cannot find where I got the he sketch that actually works from, I think is is an old version as it has no libraries, if you want this version send me your email address and I will send it to you.
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Those displays are marketed by Itead studios. You Might go to their website and look about.

Doc
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Hi Firefox

Did you get this sorted as I am having the exact same problem. The sketch you referred to earlier works OK so, I agree, that the hardware is fine.

I have also been able to get the sketch referred to in this post working : http://arduino.cc/forum/index.php/topic,119000.0.html although there is a small error in the sketch were he displays the X axis both times - just change the last print line to display the Y co-ordinate rather than the X co-ordinate again.

My plan now is to review the sketches provided by Henning Karlsen to see if I can identify what the problem is - should be easy because the sketch in the linked post uses the same libraries  smiley-confuse
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It is getting late but I think I have the answer - change the precision to PREC-MEDIUM.

It appears that PREC_LOW does not work too well  smiley-grin

I will do some further testing tomorrow night.
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Magicj

Sorry I have been asleep on the job smiley

I haven't got it working, I'm pretty sure my setting is Prec_Medium. I have given up for the moment but if you have found solution I would love to know what it is.

I think there may be a conflict software wise with a Remote Control library I am using but as I am software challenged I have no idea how to test or rectify it.
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Firefox

It looks we we have the same hardware with the same problems smiley-grin

Can you try this for me...

Load the 16_9 sketch you referred to above and then load the calibration sketch - I have found that the touch panel will now work.

Assuming you have the same result, I suspect that there is something lacking in the ITDB02-Touch library initialization section. I will see if I can identify what it is, although I am still in the learning phase with some of this stuff smiley-slim
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Hi MagicJ

I have also found that I can get the Touch to work but only when I load as you mentioned. As soon as I try reload my code with all of the Touch coding in it nothing happens. It's too big a mental challenge for me, as far as I can tell everything is as it should be in my code.

David
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Hello,

Please read another thread for this problem, it seems that I solved the issue;)
It was related to SPI reading... some delay added to give  time for settling of lines.
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Hi,
I have similar problem... I have made the required changes to the calibration and changed values in UTouchCD.h.  Now the touch panel has stopped working. I restored the original file and still not working. I have a rather correct settings:
Code:
UTFT        myGLCD(ITDB32WD,38,39,40,41); 
UTouch      myTouch(6,5,4,3,2);
Is it possible that so suddenly broke?
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