// i2c_scanner display on serial & parallel LCD 
// & also PCF8574 i2c LCD
//
// For R909OLED PCB with lcd(8,9,10,11,12.13); @20231029
//  #define lcd_backlight 7 // 
//  LCD&i2c connection OK  serial OK
//
// Expecting address Si5351a:0x60, Si4732:0x63(0x11), i2c LCD:0x27
//   OLED:0x3C
//
// Added PCF8574 type  2021.11.15
// Delete LCD #include <skI2CLCDlib.h> // 0x3E Akiduki LCD
//
// SCL:A5,SDA:A4
// 20200711 ok
//
// Version 5, March 28, 2013
// Cover over 7-bit(127d), not handle extention address
//
 
#include <Wire.h>
// #include <skI2CLCDlib.h>

/* ChibiDuino2 LCD sample
 * SETUP: (Hitachi HD44780 compatable LCD)
 * +5V LCD Vdd pin 2       >>>     Gnd LCD Vss pin 1, and R/W pin 5
 * LCD RS pin 4 to D5      >>>     LCD Enable pin 6 to D6
 * LCD D4 pin 11 to D9     >>>     LCD D5 pin 12 to D10
 * LCD D6 pin 13 to D11     >>>     LCD D7 pin 14 to D12
 * 10K pot: - ends to +5V and Gnd, wiper to LCD VO pin (pin 3)
 */


//Akiduki i2c lcd 
#include <LiquidCrystal.h>              // Sure 8x2 LCD works with this lib
//Akiduki lcd instance
//  skI2CLCDlib LCD(0x3E, 16);          // Akiduki LCD i2c addess 16 chars per 2 lines

// PCF8574 i2c lcd instance
//  Thanks for giving information about i2c LCD adapter
//  https://github.com/marcoschwartz/LiquidCrystal_I2C
 #include <LiquidCrystal_I2C.h>
 LiquidCrystal_I2C lcdi2c(0x27,16,2);

// Parallel LCD for Adru5351 PCB
// instanciate the library and pass pins for (RS, Enable, D4, D5, D6, D7)
LiquidCrystal    lcd(8,9,10,11,12,13);

#define led_pin 15
#define lcd_backlight 7


  byte error, address;
  int nDevices;
  boolean led_status;
  char charbuf[6];

void setup()
{
  Wire.begin();
  Serial.begin(9600);
  Serial.println("\ni2c Scanner");
  pinMode(led_pin, OUTPUT);
  pinMode(lcd_backlight, OUTPUT);
  digitalWrite( lcd_backlight, 1);
  
// Akiduki i2c setup
// ICON OFF,contrast(0-63),VDD=5V
// LCD.Init(LCD_NOT_ICON,32,LCD_VDD5V) ; //change to 5V @20200612   
// 
//  LCD.SetCursor(0,0) ;               // starting @1,1 line 1 & column 1
//  LCD.Puts("i2c address scan") ;     // buffer address [00H]
//  LCD.SetCursor(0,1) ;               // starting @2,1 [40H]
//  LCD.Puts("   i2cLCDv1.0   ") ;     // buffer address [40H]

// PCF8574 i2c lcd
// Iniatilize i2c LCD
  lcdi2c.init(); 
  lcdi2c.backlight();

// 4 bits parallel LCD
  lcd.begin(16,2);                    // set lib for display size (2x16)
  lcd.clear();                       // clear the screen   
}
 
 
void loop()
{
 
  Serial.println("i2c Scanning start");
  digitalWrite(led_pin, led_status);  
  led_status = !led_status;
  delay(1000);   

//  LCD.SetCursor(0,0) ;               // [00H]
//  LCD.Puts("i2c Scan test   ") ;     //

  lcdi2c.setCursor( 0, 0) ;            // Set position
  lcdi2c.print( "i2c Scan test" ) ;    // Let to display

  lcd.setCursor(0,0);
  lcd.print("i2c Scan test   ") ;   
  
//  LCD.SetCursor(0,1) ;               // Set position @2,1 [40H]
//  LCD.Puts("ADR:") ;                 // LCD

  lcdi2c.setCursor( 0, 1) ;            // Set column position
  lcdi2c.print( "ADR:" ) ;             // Let to display
  
  lcd.setCursor(0,1);
  lcd.print("ADR:") ;  

    
  nDevices = 0;
  for(address = 1; address < 127; address++ )
  {
    // Check WIRE function return back result
    // The value of Write.endTransmisstion
    // Is there ACK response (yes:0） or no
    Wire.beginTransmission(address);
    error = Wire.endTransmission();
 
    if (error == 0)         // Got response
    {
      Serial.print("i2c device found at address 0x");
      if (address<16) Serial.print("0");
      Serial.print(address,HEX);
      Serial.println("  !");

      sprintf(charbuf, "%02X", address );
//      LCD.Puts("0x") ;
//      LCD.Puts(charbuf) ;    
//      LCD.Puts(",") ;
//      lcdi2c.print("0x") ;  
      lcdi2c.print(charbuf) ;  
      lcdi2c.print(",") ;        
//      lcd.print("0x") ;  
      lcd.print(charbuf) ;  
      lcd.print(",") ;  
       
      nDevices++;
    }
    else if (error==4)
    {
      Serial.print("Unknown error at address 0x");
      if (address<16) Serial.print("0");
      Serial.println(address,HEX);
    }    
  }
  
  if (nDevices == 0)
  {
    Serial.println("No i2c devices found\n");
//    LCD.Puts("No devices found") ; 
    lcdi2c.print("No devices found") ;     
    lcd.print("No devices found") ;  

  }
  else{
    Serial.println("done\n");
//    LCD.Puts("done            ");
    lcdi2c.print("done           ") ;     
    lcd.print("done           ") ; 
  } 

  delay(2000);                  // Wait 2 sec
  lcd.clear();                  // clear the screen 
  lcdi2c.clear();               // clear the screen 

}