/**************************************************************************
 Monochrome OLEDs based on SSD1306 drivers

 This example is for a 128x64 pixel display using I2C to communicate
 3 pins are required to interface (two I2C and one reset).

 Written by Sylvain DENIS for FabAcademy,
 with contributions from the open source community.

Corrected By Quentin BOLSEE

MIT license
 **************************************************************************/

#include <SPI.h>
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>

#define SCREEN_WIDTH 128 // OLED display width, in pixels
#define SCREEN_HEIGHT 64 // OLED display height, in pixels

#define Y_POS 16 //Defines the starting position in height
#define TXT_SIZE 5 //Define Size 

// Declaration for an SSD1306 display connected to I2C (SDA, SCL pins)
// The pins for I2C are defined by the Wire-library. 
// On an arduino UNO:       A4(SDA), A5(SCL)
// On an arduino MEGA 2560: 20(SDA), 21(SCL)
// On an arduino LEONARDO:   2(SDA),  3(SCL), ...
#define OLED_RESET     4 // Reset pin # (or -1 if sharing Arduino reset pin)
#define SCREEN_ADDRESS 0x3C ///< See datasheet for Address; 0x3D for 128x64, 0x3C for 128x32 - Here - 0x3C
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);

int x = SCREEN_WIDTH/2; // Start at half screen
int x_min = 0;

const char* txt = "Hello FabAcademy 2022"; //You can change the text

void setup() {
  SerialUSB.begin(9600);

  // SSD1306_SWITCHCAPVCC = generate display voltage from 3.3V internally
  if(!display.begin(SSD1306_SWITCHCAPVCC, SCREEN_ADDRESS)) {
    SerialUSB.println(F("SSD1306 allocation failed"));
    for(;;); // Don't proceed, loop forever
  }

  // Show initial display buffer contents on the screen --
  // the library initializes this with an Adafruit splash screen.
  display.clearDisplay();
  display.display();
  
  // Clear the buffer
  display.clearDisplay();

  //  testdrawchar();

  display.clearDisplay();
  display.setTextColor(SSD1306_WHITE);
  display.setTextWrap(false); //We prevent the return to the line

  // text size of 1 => 6 pixels
  x_min = -6 * TXT_SIZE * strlen(txt);
}

void loop() {
  display.clearDisplay();
  display.setCursor(x, Y_POS);
  display.setTextSize(TXT_SIZE);
  display.print(txt);
  display.display();
  
  x--;
  
  if (x < x_min) {
    x = SCREEN_WIDTH;
  }
}