#include <Adafruit_GFX.h> // https://github.com/adafruit/Adafruit-GFX-Library
#include <Adafruit_ILI9341.h> // https://github.com/adafruit/Adafruit_ILI9341
// #include <Adafruit_BusIO.h> //https://github.com/adafruit/Adafruit_BusIO

#define TFT_MISO 15
#define TFT_CLK  18
#define TFT_MOSI 23
#define TFT_DC   2 // incorrect DC to screen pin gives white screen
#define TFT_RST  4
#define TFT_CS   5
Adafruit_ILI9341 tft = Adafruit_ILI9341(TFT_CS, TFT_DC, TFT_RST);

void setup() {
  Serial.begin(115200);
  tft.begin();
  // test(); // uncomment to read device results
  tft.setRotation(0);
  tft.setTextColor(ILI9341_WHITE);
  tft.setTextSize(2);
  text();
  pixel();
  line();
  rect();
  circle();
  Serial.println("\nFin.");
}

void loop() {
}

void text() {
  int x = 45, y = 160;
  tft.setCursor(x, y);
  tft.print("Hello, World!");
}

void pixel() {
  int y = 180, color = ILI9341_YELLOW;
  for (int x = 80; x < 180; x += 5) // increase left to right
    tft.drawPixel(x, y, color);
}

void line() {
  int xStart = 0, yStart = 0, xEnd = 240, yEnd = 320, color = ILI9341_RED;
  tft.drawLine(xStart, yStart, xEnd, yEnd, color);
}

void rect() {
  int x = 40, y = 150, width = 160, height = 40, color = ILI9341_CYAN;
  tft.drawRect(x, y, width, height, color);
}

void circle() {
  int x = 120, y = 170, radius = 90, color = ILI9341_GREEN;
  tft.drawCircle(x, y, radius, color);
}

void test() {
  uint8_t x = tft.readcommand8(ILI9341_RDMODE);
  Serial.println();
  Serial.print("Display Power Mode: 0x"); Serial.println(x, HEX);
  x = tft.readcommand8(ILI9341_RDMADCTL);
  Serial.print("MADCTL Mode       : 0x"); Serial.println(x, HEX);
  x = tft.readcommand8(ILI9341_RDPIXFMT);
  Serial.print("Pixel Format      : 0x"); Serial.println(x, HEX);
  x = tft.readcommand8(ILI9341_RDIMGFMT);
  Serial.print("Image Format      : 0x"); Serial.println(x, HEX);
  x = tft.readcommand8(ILI9341_RDSELFDIAG);
  Serial.print("Self Diagnostic   : 0x"); Serial.println(x, HEX);
  while (1);
}