// ------------------------------------------------------------
// STM32 Nucleo-C031C6 SPI LCD Example (ILI9341)
// Simulation link:
// https://wokwi.com/projects/365549388158011393
// ------------------------------------------------------------

// Include SPI library → Enables SPI communication
#include "SPI.h"

// Include Adafruit graphics core library
// Provides basic drawing functions like text, lines, shapes
#include "Adafruit_GFX.h"

// Include ILI9341 LCD driver library
// Handles commands specific to ILI9341 TFT display
#include "Adafruit_ILI9341.h"

// ------------------------------------------------------------
// Pin definitions for TFT display
// ------------------------------------------------------------

// Data/Command pin of TFT connected to STM32 pin 2
#define TFT_DC 2

// Chip Select pin of TFT connected to STM32 pin 3
#define TFT_CS 3

// Create TFT display object
// Parameters: CS pin, DC pin
Adafruit_ILI9341 tft = Adafruit_ILI9341(TFT_CS, TFT_DC);

// ------------------------------------------------------------
// SETUP FUNCTION
// Runs once when the board is powered ON or reset
// ------------------------------------------------------------
void setup() {

  // Initialize Serial communication at 115200 baud rate
  // Used for debugging messages in Serial Monitor
  Serial.begin(115200);

  // Print a message to Serial Monitor
  Serial.println("Hello, WOKWI");

  // Initialize the TFT LCD
  // This sets SPI, resets the display, and configures it
  tft.begin();

  // ---------------- Display First Text ----------------

  // Set cursor position (X = 20 pixels, Y = 120 pixels)
  tft.setCursor(20, 120);

  // Set text color to RED
  tft.setTextColor(ILI9341_RED);

  // Set text size (3 = large text)
  tft.setTextSize(3);

  // Print text on TFT display
  tft.println("Hello STM2");

  // ---------------- Display Second Text ----------------

  // Move cursor to a new position
  tft.setCursor(24, 160);

  // Change text color to GREEN
  tft.setTextColor(ILI9341_GREEN);

  // Set smaller text size
  tft.setTextSize(2);

  // Print second message
  tft.println("I can do SPI :-)");
}

// ------------------------------------------------------------
// LOOP FUNCTION
// Runs continuously after setup()
// ------------------------------------------------------------
void loop() {

  // Delay for 1000 milliseconds (1 second)
  // No repeated action here, display remains static
  delay(1000);
}