Adafruit 2.8" TFT LCD with Cap Touch Breakout Board - Gestures

Other Hardware Displays
1

Hey,

This board used the FT6206 chip, which communicates with the arduino over i2c. I've been using the Adadruit_FT6206 library with the touch screen, and have detection of points working fine.

I found this datasheet: https://cdn-shop.adafruit.com/datasheets/FT6x06_AN_public_ver0.1.3.pdf, which says that it should be possible to use gestures such as touch up/down and zoom with the shield. According to the datasheet, there is a gest_id available on one of the i2c registers, which can simply be requested for over the i2c bus.

I have altered the readData() function of the library as follows (last 3 lines of code):

void Adafruit_FT6206::readData(uint16_t *x, uint16_t *y) {

  uint8_t i2cdat[16];
  Wire.beginTransmission(FT6206_ADDR);
  Wire.write((byte)0);  
  Wire.endTransmission();
  Wire.beginTransmission(FT6206_ADDR);
  Wire.requestFrom((byte)FT6206_ADDR, (byte)32);
  for (uint8_t i=0; i<16; i++)
    i2cdat[i] = Wire.read();
  Wire.endTransmission();  

  touches = i2cdat[0x02];

  //Serial.println(touches);
  if (touches > 2) {
    touches = 0;
    *x = *y = 0;
  }
  if (touches == 0) {
    *x = *y = 0;
    return;
  }

  /*
  if (touches == 2) Serial.print('2');
  for (uint8_t i=0; i<16; i++) {
   // Serial.print("0x"); Serial.print(i2cdat[i], HEX); Serial.print(" ");
  }
  */

  /*
  Serial.println();
  if (i2cdat[0x01] != 0x00) {
    Serial.print("Gesture #"); 
    Serial.println(i2cdat[0x01]);
  }
  */

    //Serial.print("# Touches: "); Serial.print(touches);
    for (uint8_t i=0; i<2; i++) {
      touchX[i] = i2cdat[0x03 + i*6] & 0x0F;
      touchX[i] <<= 8;
      touchX[i] |= i2cdat[0x04 + i*6]; 
      touchY[i] = i2cdat[0x05 + i*6] & 0x0F;
      touchY[i] <<= 8;
      touchY[i] |= i2cdat[0x06 + i*6];
      touchID[i] = i2cdat[0x05 + i*6] >> 4;
    }

    *x = touchX[0]; *y = touchY[0];
    
    // TESTING GESTURES
    int gestureId = i2cdat[0x01];
    Serial.print("x,y,w: "); Serial.print(i2cdat[0x04]); Serial.print(", "); Serial.print(i2cdat[0x06]); Serial.print(", "); Serial.println(i2cdat[0x07]);
    Serial.print("gest_id: "); Serial.println(gestureId);
}

However gives output similar to:

x,y,w: 67, 207, 0
gest_id: 0

with the gest_id always being 0.

Many Thanks

Henry