/* ESP32_SPI_9481_v1
 *  
 *  Despite the script name I was supplied with a 9486
 *  
 *  Basic attempt to get screen working
 * Screen working...eventually
 * I has to uncomment the following in the User_SetUp.h to get correct colours
 * 
 //#define TFT_INVERSION_ON
 #define TFT_INVERSION_OFF
 
 * Touch working
 * 
 * pins, note that touch and screen share a couple of pins...SPI
 * 
 Pins in Order starting at screen VCC
 
VCC 3.3v (My screen spec said it would accept 5 v on VCC not Logic pins
GND > Gnd
TFT_CS   > ESP pin 15  // Chip select control pin
TFT_RST  > ESP pin  4 
TFT_DC   > ESP pin  2  // Data Command control pin
TFT_MOSI (SDI) > ESP pin 23
TFT_SCLK > ESP pin 18
BL (LCD power) 3.3V
TFT_MISO > ESP pin 19...although can be left disconnected if not trying to read back from screen
Touch clock TCK > ESP pin 18
Touch Chip Select TCS > ESP pin 21
Touch data to screen TOI > ESP pin 23
Touch Data from screen TDI > ESP pin 19 
PEN unused

 */
#include "TFT_eSPI.h" // Hardware-specific library
#include "SPI.h"

//#define TFT_RED         0xF800      /* 255,   0,   0 */

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

//touch variables
int xTouch; //x position
int yTouch; //y position
unsigned long touchTimer;//keeps track of touch timings
const int debounceSensitivity = 300;//300 milliseconds debounce



//deals with screen being touched
void screenPress() {
  uint16_t x, y;
  unsigned long currentMillis;
  currentMillis = millis();
  //deals with debouncing
  if ((currentMillis - touchTimer) >= debounceSensitivity) {
    touchTimer = currentMillis;

    tft.getTouchRaw(&x, &y);//only bother getting readings when needed
    if (tft.getTouchRawZ() > 500) {
      //will need alterations if screen is rotated
      xTouch = (x - 380) / 10; //9.75
      yTouch = (y - 248) / 7; //7.04
      
      Serial.printf("x: %i     ", x);
      Serial.printf("y: %i     ", y);
      Serial.printf("z: %i \n", tft.getTouchRawZ());
      Serial.print("X: ");
      Serial.print(xTouch);
      Serial.print("   Y: ");
      Serial.println(yTouch);
    }
  }
}

void setup() {
  Serial.begin(115200);
  Serial.println("ESP32_SPI_9481_v1");
  
  tft.begin();
  tft.init();
  tft.setRotation(0);
  

  tft.fillScreen(TFT_RED);
  tft.drawRect(0,0,319,476,TFT_WHITE);//screen seems to only display 476 wide, rest is hidden under black surround
  tft.drawRect(10,10,10,10,TFT_WHITE);//just to let me know top corner
  tft.setTextColor(TFT_WHITE, TFT_BLACK);
  tft.setCursor(40,40);
  tft.println("Some Text");
}

void loop() {
   screenPress();
}