/* ESP32 Touch Screen

Allows a user to touch the screen, displays a dot at that location
*/

#include <TFT_eSPI.h>
#include <SPI.h>       // this is needed for display
#include <Wire.h>      // this is needed for FT6206
#include <Adafruit_FT6206.h>

Adafruit_FT6206 ctp = Adafruit_FT6206();

// The display also uses hardware SPI, plus #9 & #10
#define TFT_CS 15
#define TFT_DC 2
#define TFT_MOSI 23
#define TFT_SCLK 18

TFT_eSPI tft = TFT_eSPI(); // Invoke custom library with default width and height

void setup(void) {
  Serial.begin(115200);
  tft.begin();

  if (! ctp.begin(40)) {  // pass in 'sensitivity' coefficient
    Serial.println("Couldn't start FT6206 touchscreen controller");
    while (1);
  }

  tft.setRotation(0);
  Serial.println("TFT set up");

  String text = "Touch the screen to paint";
  tft.drawString(text, 0, 0, 2);
}


void loop() {
  if (ctp.touched()) {
    // Retrieve a point  
    TS_Point p = ctp.getPoint();

    p.x = map(p.x, 0, 240, 240, 0);
    p.y = map(p.y, 0, 320, 320, 0);

    tft.fillCircle(p.x, p.y, 2, TFT_WHITE);
    Serial.print("x,y = ");
    Serial.print(p.x);
    Serial.print(",");
    Serial.println(p.y);
  }
}