// STM32 Nucleo-C031C6 I2C Example
// Simulation: https://wokwi.com/projects/365421666018061313
#include <Wire.h> 
#include "LiquidCrystal_I2C.h"

#define I2C_ADDR    0x27
#define LCD_COLUMNS 20
#define LCD_LINES   4
//#define I2C1_SDA    D14
//#define I2C1_SCL    D15
//I2C1 my_i2c(I2C1_SDA, I2C1_SCL);
LiquidCrystal_I2C lcd(I2C_ADDR, LCD_COLUMNS, LCD_LINES);
void setup()
{
  Wire.begin(); 
  Serial.begin(9600);
  Serial.println("\nI2C Scanner");
}
void loop()
{
  byte error, address;
  int nDevices;
 
  Serial.print("Scanning");
 
  nDevices = 0;
  for(address = 1; address < 127; address++ )
  {
    Wire.beginTransmission(address);
    error = Wire.endTransmission();
    // La valeur de retour de Wire.endTransmission() 
    // est false (0) si le peripherique existe a cette adresse
    Serial.print(".");
 
    if (error == 0)
    {
      Serial.println("");        // retour à la ligne
      Serial.print("I2C device found at address 0x");
      if (address<16)
        Serial.print("0");
      Serial.print(address,HEX);
      Serial.println("  !"); 
      nDevices++;
      break;     // commenter cette ligne si vous recherchez plusieurs péripheriques I2C
                     // sur le bus, sinon le test s'arrête dès le premier trouvé
    }
    else if (error==4)
    {
      Serial.println(""); 
      Serial.print("Unknow error at address 0x");
      if (address<16)
        Serial.print("0");
      Serial.println(address,HEX);
    }  
    delay(50);
  }
  if (nDevices == 0)
  {
    Serial.println(""); 
    Serial.println("No I2C devices found\n");
  }
  else
    Serial.println("done\n");
 
  delay(3000);           // on attend 3 secondes et on recommence
}
/*
void setup() {
  Serial.begin(115200);
  Serial.println("Hello, STM32!");

  lcd.init();
  lcd.backlight();

  lcd.setCursor(4, 0);
  lcd.print("Hello, STM32");
  lcd.setCursor(5, 2);
  lcd.print("Welcome to");
  lcd.setCursor(7, 3);
  lcd.print("Wokwi!");
}

void loop() {
}
*/