#include <Adafruit_GFX.h>
#include <Adafruit_ILI9341.h>
#include "qrcode.h"

//paramters define
#define   MODEL ILI9341
#define TFT_CS    5    
#define TFT_DC    4
#define TFT_RST   16
#define  TFT_MOSI  23
#define TFT_MISO  19
#define TFT_SCK   18
#define TFT_LED   0   //if you   don't need to control the LED pin,you should set it to -1 and set it to 3.3V


//define some colour values
#define   BLACK   0x0000
#define BLUE    0x001F
#define RED     0xF800
#define   GREEN   0x07E0
#define CYAN    0x07FF
#define MAGENTA 0xF81F
#define YELLOW   0xFFE0
#define WHITE   0xFFFF

Adafruit_ILI9341 tft = Adafruit_ILI9341(TFT_CS,TFT_DC, TFT_RST);
//QRCode qrcode;
void   setup() {
  Serial.begin(115200);
  // Initialize the TFT display
  tft.begin();
  tft.setRotation(3); // Adjust the rotation if needed  
  tft.fillScreen(ILI9341_BLACK);
  tft.setTextColor(ILI9341_WHITE);
  tft.setTextSize(4);
  // Generate and display QR code
  //QRCode qrcode;
  String qrData = "http://www.google.com";  // Replace with your QR code data
  generateAndDisplayQRCode(qrData);
}

void loop() {
  // Nothing to do here
}

void generateAndDisplayQRCode(String qrData) {
  QRCode qrcode;

  int moduleSize = 6; // Adjust the module size as needed

  // Allocate QR code data structure
  uint8_t qrcodeData[qrcode_getBufferSize(3)];

  // Generate QR code
  qrcode_initText(&qrcode, qrcodeData, 3, ECC_MEDIUM, qrData.c_str() );
  
  // Display QR code on the TFT
  for (int y = 0; y < qrcode.size; y++) {
    for (int x = 0; x < qrcode.size; x++) {
      if (qrcode_getModule(&qrcode, x, y)) {
        tft.fillRect(x * moduleSize, y * moduleSize, moduleSize, moduleSize, ILI9341_WHITE);
      }
    }
  }
  tft.setCursor(20, 200);
  tft.println("Scan to Pay");
}