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

#define TFT_CS     16
#define TFT_DC     5
Adafruit_ILI9341 tft = Adafruit_ILI9341(TFT_CS, TFT_DC);

#define BLUE      0x001F
#define RED       0xF800
#define GREEN     0x07E0
#define WHITE     0xFFFF
#define BLACK     0x0000
#define YELLOW    0xFFE0

#define Num_Samples 128

static byte WaveFormTable[Num_Samples] = 
   // Sin wave
   { 
    0x80, 0x83, 0x87, 0x8A, 0x8E, 0x91, 0x95, 0x98, 0x9B, 0x9E, 0xA2, 0xA5, 0xA7, 0xAA, 0xAD, 0xAF,
    0xB2, 0xB4, 0xB6, 0xB8, 0xB9, 0xBB, 0xBC, 0xBD, 0xBE, 0xBF, 0xBF, 0xBF, 0xC0, 0xBF, 0xBF, 0xBF,
    0xBE, 0xBD, 0xBC, 0xBB, 0xB9, 0xB8, 0xB6, 0xB4, 0xB2, 0xAF, 0xAD, 0xAA, 0xA7, 0xA5, 0xA2, 0x9E,
    0x9B, 0x98, 0x95, 0x91, 0x8E, 0x8A, 0x87, 0x83, 0x80, 0x7C, 0x78, 0x75, 0x71, 0x6E, 0x6A, 0x67,
    0x64, 0x61, 0x5D, 0x5A, 0x58, 0x55, 0x52, 0x50, 0x4D, 0x4B, 0x49, 0x47, 0x46, 0x44, 0x43, 0x42,
    0x41, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x41, 0x42, 0x43, 0x44, 0x46, 0x47, 0x49, 0x4B,
    0x4D, 0x50, 0x52, 0x55, 0x58, 0x5A, 0x5D, 0x61, 0x64, 0x67, 0x6A, 0x6E, 0x71, 0x75, 0x78, 0x7C
   
};

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

  tft.begin();
  tft.setRotation(1);
  tft.fillScreen(BLACK);

  drawSineWave();
}

void loop() {
  // No action in the loop
}

void drawSineWave() {
  // Thickness of the line
  int thickness = 3;
  
  for (int i = 0; i < Num_Samples; i++) {
    float angle = (float)i / Num_Samples * TWO_PI;
    int x = i * tft.width() / Num_Samples;
    int y = map(WaveFormTable[i], 0, 255, tft.height(), 0);
    
    // Draw the sine wave with thicker yellow line
    for (int j = 0; j < thickness; j++) {
      tft.drawPixel(x, y + j, YELLOW);
    }
  }
}