/**************************************************************************
 This is an example 
 write the six componet of an array on 
 - Arduino serial monitor
 - SSD1306 Monochrome OLEDs display

 https://github.com/adafruit/Adafruit_SSD1306

 https://learn.adafruit.com/adafruit-gfx-graphics-library/using-fonts
FreeMono12pt7b.h		  FreeSansBoldOblique12pt7b.h FreeMono18pt7b.h		        FreeSansBoldOblique18pt7b.h
FreeMono24pt7b.h		  FreeSansBoldOblique24pt7b.h FreeMono9pt7b.h			        FreeSansBoldOblique9pt7b.h
FreeMonoBold12pt7b.h		  FreeSansOblique12pt7b.h FreeMonoBold18pt7b.h		    FreeSansOblique18pt7b.h
FreeMonoBold24pt7b.h		  FreeSansOblique24pt7b.h FreeMonoBold9pt7b.h		      FreeSansOblique9pt7b.h
FreeMonoBoldOblique12pt7b.h	  FreeSerif12pt7b.h   FreeMonoBoldOblique18pt7b.h	FreeSerif18pt7b.h
FreeMonoBoldOblique24pt7b.h	   FreeSerif24pt7b.h  FreeMonoBoldOblique9pt7b.h	FreeSerif9pt7b.h
FreeMonoOblique12pt7b.h		  FreeSerifBold12pt7b.h FreeMonoOblique18pt7b.h		  FreeSerifBold18pt7b.h
FreeMonoOblique24pt7b.h		  FreeSerifBold24pt7b.h FreeMonoOblique9pt7b.h		  FreeSerifBold9pt7b.h
FreeSans12pt7b.h		  FreeSerifBoldItalic12pt7b.h FreeSans18pt7b.h		        FreeSerifBoldItalic18pt7b.h
FreeSans24pt7b.h		  FreeSerifBoldItalic24pt7b.h FreeSans9pt7b.h			        FreeSerifBoldItalic9pt7b.h
FreeSansBold12pt7b.h		  FreeSerifItalic12pt7b.h FreeSansBold18pt7b.h		    FreeSerifItalic18pt7b.h
FreeSansBold24pt7b.h		  FreeSerifItalic24pt7b.h FreeSansBold9pt7b.h		      FreeSerifItalic9pt7b.h
 **************************************************************************/

//#include <SPI.h> // protocollo SPI alternativo al i2c
#include <Wire.h> // protocollo i2c per settare ad esempio la velocità
#include <Adafruit_GFX.h> // font
#include <Adafruit_SSD1306.h>
#include <Fonts/FreeSans9pt7b.h>
#include <Fonts/FreeSans12pt7b.h>
#include <Fonts/FreeSans18pt7b.h>

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

// Declaration for an SSD1306 display connected to I2C (SDA, SCL pins)
#define OLED_RESET     4 // Reset pin # (or -1 if sharing Arduino reset pin)
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);

char str[20];
float risultato=0.1234;

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

  // SSD1306_SWITCHCAPVCC = generate display voltage from 3.3V internally
  if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3D)) { // Address 0x3D for 128x64
    Serial.println(F("SSD1306 allocation failed"));
    for(;;); // Don't proceed, loop forever
  }
  display.setTextSize(1);      // Normal 1:1 pixel scale
  display.setTextColor(SSD1306_WHITE); // Draw white text
  display.setCursor(0, 0);     // Start at top-left corner
  display.cp437(true);         // Use full 256 char 'Code Page 437' font
  
  // Clear the buffer
  display.clearDisplay();
  delay(500);

  /*
  testdrawchar();      // Draw characters of the default font
  testdrawstyles();    // Draw 'stylized' characters
  testscrolltext();    // Draw scrolling text
  */
}

int numeri[]={5,6,9,7,3,1};
int j = 0;
int maxj=4;
static char ch,outstr[30];

void loop() {
  
      while (j==0) {
        
        display.setCursor(0, 15);     // Start at top-left corner
        display.setFont(&FreeSans9pt7b);
        display.setTextSize(1);      
        dtostrf(risultato,8,4,outstr ); 
        display.print(outstr);
        //display.write(outstr);
      
        j=1;
        
        display.display();
      }
}

/*
 display.setTextColor(BLACK, WHITE);
 display.setTextColor(WHITE, BLACK);
 display.setTextColor(SSD1306_BLACK, SSD1306_WHITE);

 displayLine(F("SNAP"),F("SNAP"),F("SNAP"),F("FS5 "),4);
 display.println(F("Hello, world!"));
 display.println(0xDEADBEEF, HEX);
 display.startscrollright(0x00, 0x0F);
 display.stopscroll();
 display.startscrollleft(0x00, 0x0F);
 display.startscrolldiagright(0x00, 0x07);
 display.startscrolldiagleft(0x00, 0x07);
  
*/