Cant get touch working on ILI9341 display

Salchicha

Active member
I have my ILI9341 display working ok display wise but I cant get the touch functionality working, I've tried a few of the example sketches but none work.
I got mine off Amazon, it is branded as 'Hailage' rather than Adafruit, not sure if this makes a difference, one of the comments said it is using the XPT2046 drivers, which is mentioned in the sketch name I'm using.
Here is one of the examples I've modified (touchpaint_xpt2046), I've triple checked all the physical connections match up so as far as I can tell it should work.

I'm using Teensy 4.1, Arduino IDE

C++:
// uncomment to try Touch on SPI1 pins
#define TOUCH_SPI1
// FlexSPI on SPI1 pins
#define TOUCH_FLEXSPI


//****************************************************************************
// Includes
//****************************************************************************
#include <XPT2046_Touchscreen.h>
#include <ILI9341_t3n.h>

#ifdef TOUCH_FLEXSPI
#include <FlexIOSPI.h>
#include <FlexIO_t4.h>
#endif


//****************************************************************************
// This is calibration data for the raw touch data to the screen coordinates
//****************************************************************************
// Warning, These are
#define TS_MINX 337
#define TS_MINY 529
#define TS_MAXX 3729
#define TS_MAXY 3711

//****************************************************************************
// Settings and objects
//****************************************************************************
#if defined(KURTS_FLEXI)
#define TFT_DC 22
#define TFT_CS 15
#define TFT_RST -1
#define TFT_SCK 14
#define TFT_MISO 12
#define TFT_MOSI 7
#define DEBUG_PIN 13
#define TOUCH_CS  8
#else
// *************** Change to your Pin numbers ***************
#define TFT_DC  9
#define TFT_CS 10
#define TFT_RST 8
#define TFT_SCK 13
#define TFT_MISO 12
#define TFT_MOSI 11
#define TOUCH_CS  8
#endif

// If using SPI1 you can optionally setup to use other MISO pin on T4.1

#ifdef TOUCH_SPI1
#define TOUCH_MOSI 11
#define TOUCH_MISO 12
#define TOUCH_SCK  13
#undef TOUCH_CS
#define TOUCH_CS  8
#endif

// Setup flexSPI on same pins as SPI1
#ifdef TOUCH_FLEXSPI
#define TOUCH_MOSI 11
#define TOUCH_MISO 12
#define TOUCH_SCK  13
#undef TOUCH_CS
#define TOUCH_CS  8
FlexIOSPI  flexspi(TOUCH_MOSI, TOUCH_MISO, TOUCH_SCK);
#endif

XPT2046_Touchscreen ts(TOUCH_CS);
ILI9341_t3n tft = ILI9341_t3n(TFT_CS, TFT_DC, TFT_RST, TFT_MOSI, TFT_SCK, TFT_MISO);

// Size of the color selection boxes and the paintbrush size
#define BOXSIZE 40
#define PENRADIUS 3
int oldcolor, currentcolor;

//****************************************************************************
// Setup
//****************************************************************************
void setup(void) {
  while (!Serial && (millis() <= 1000));

  Serial.begin(9600);
  Serial.println(F("Touch Paint!"));

  tft.begin();

#if defined (TOUCH_SPI1)
  Serial.println("Using SPI1 for Touch\n");
  // Can setup to use SPI1
  #ifdef TOUCH_MISO
  SPI1.setMISO(TOUCH_MISO);
  #endif
  if (!ts.begin(SPI1)) {
#elif defined(TOUCH_FLEXSPI)
  Serial.println("Using flexSPI for Touch\n");
  if (!ts.begin(flexspi)) {
#else
  // Or by default use SPI
  if (!ts.begin()) {
#endif
    Serial.println("Couldn't start touchscreen controller");
    while (1);
  }
  Serial.println("Touchscreen started");

  tft.fillScreen(ILI9341_BLACK);

  // make the color selection boxes
  tft.fillRect(0, 0, BOXSIZE, BOXSIZE, ILI9341_RED);
  tft.fillRect(BOXSIZE, 0, BOXSIZE, BOXSIZE, ILI9341_YELLOW);
  tft.fillRect(BOXSIZE * 2, 0, BOXSIZE, BOXSIZE, ILI9341_GREEN);
  tft.fillRect(BOXSIZE * 3, 0, BOXSIZE, BOXSIZE, ILI9341_CYAN);
  tft.fillRect(BOXSIZE * 4, 0, BOXSIZE, BOXSIZE, ILI9341_BLUE);
  tft.fillRect(BOXSIZE * 5, 0, BOXSIZE, BOXSIZE, ILI9341_MAGENTA);

  // select the current color 'red'
  tft.drawRect(0, 0, BOXSIZE, BOXSIZE, ILI9341_WHITE);
  currentcolor = ILI9341_RED;
}


void loop()
{
  // See if there's any  touch data for us
  if (ts.bufferEmpty()) {
    return;
  }

  // You can also wait for a touch
  /*
  if (! ts.touched()) {
    return;
  }
*/



  // Retrieve a point
  TS_Point p = ts.getPoint();

  // p is in ILI9341_t3 setOrientation 1 settings. so we need to map x and y differently.

  // Serial.println("X = "); Serial.print(p.x);
  // Serial.println("\tY = "); Serial.print(p.y);
  // Serial.println("\tPressure = "); Serial.print(p.z);


  // Scale from ~0->4000 to tft.width using the calibration #'s
#ifdef SCREEN_ORIENTATION_1
  p.x = map(p.x, TS_MINX, TS_MAXX, 0, tft.width());
  p.y = map(p.y, TS_MINY, TS_MAXY, 0, tft.height());
#else
 
  uint16_t px = map(p.y, TS_MAXY, TS_MINY, 0, tft.width());
  p.y = map(p.x, TS_MINX, TS_MAXX, 0, tft.height());
  p.x = px;
#endif
/*
    Serial.print(" ("); Serial.print(p.x);
    Serial.print(", "); Serial.print(p.y);
    Serial.println(")");
*/

  if (p.y < BOXSIZE) {
    oldcolor = currentcolor;

    if (p.x < BOXSIZE) {
      currentcolor = ILI9341_RED;
      tft.drawRect(0, 0, BOXSIZE, BOXSIZE, ILI9341_WHITE);
    } else if (p.x < BOXSIZE * 2) {
      currentcolor = ILI9341_YELLOW;
      tft.drawRect(BOXSIZE, 0, BOXSIZE, BOXSIZE, ILI9341_WHITE);
    } else if (p.x < BOXSIZE * 3) {
      currentcolor = ILI9341_GREEN;
      tft.drawRect(BOXSIZE * 2, 0, BOXSIZE, BOXSIZE, ILI9341_WHITE);
    } else if (p.x < BOXSIZE * 4) {
      currentcolor = ILI9341_CYAN;
      tft.drawRect(BOXSIZE * 3, 0, BOXSIZE, BOXSIZE, ILI9341_WHITE);
    } else if (p.x < BOXSIZE * 5) {
      currentcolor = ILI9341_BLUE;
      tft.drawRect(BOXSIZE * 4, 0, BOXSIZE, BOXSIZE, ILI9341_WHITE);
    } else if (p.x < BOXSIZE * 6) {
      currentcolor = ILI9341_MAGENTA;
      tft.drawRect(BOXSIZE * 5, 0, BOXSIZE, BOXSIZE, ILI9341_WHITE);
    }

    if (oldcolor != currentcolor) {
      if (oldcolor == ILI9341_RED)
        tft.fillRect(0, 0, BOXSIZE, BOXSIZE, ILI9341_RED);
      if (oldcolor == ILI9341_YELLOW)
        tft.fillRect(BOXSIZE, 0, BOXSIZE, BOXSIZE, ILI9341_YELLOW);
      if (oldcolor == ILI9341_GREEN)
        tft.fillRect(BOXSIZE * 2, 0, BOXSIZE, BOXSIZE, ILI9341_GREEN);
      if (oldcolor == ILI9341_CYAN)
        tft.fillRect(BOXSIZE * 3, 0, BOXSIZE, BOXSIZE, ILI9341_CYAN);
      if (oldcolor == ILI9341_BLUE)
        tft.fillRect(BOXSIZE * 4, 0, BOXSIZE, BOXSIZE, ILI9341_BLUE);
      if (oldcolor == ILI9341_MAGENTA)
        tft.fillRect(BOXSIZE * 5, 0, BOXSIZE, BOXSIZE, ILI9341_MAGENTA);
    }
  }
  if (((p.y - PENRADIUS) > BOXSIZE) && ((p.y + PENRADIUS) < tft.height())) {
    tft.fillCircle(p.x, p.y, PENRADIUS, currentcolor);
  }
}
 
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