// #include <LiquidCrystal_I2C.h>

// LiquidCrystal_I2C lcd(0x27,20,4);  // set the LCD address to 0x3F for a 16 chars and 2 line display

// void setup() {
//   lcd.init();
//   lcd.clear();         
//   lcd.backlight();      // Make sure backlight is on
  
//   // Print a message on both lines of the LCD.
//   lcd.setCursor(2,0);   //Set cursor to character 2 on line 0
//   lcd.print("Hello world!");
  
//   lcd.setCursor(2,1);   //Move cursor to character 2 on line 1
//   lcd.print("LCD Tutorial");
// }

// void loop() {
// }
//---------------------------------------------------------------------------------
#include <stdio.h>
#include <string.h>
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "driver/i2c.h"
#include "esp_err.h"
#include "sdkconfig.h"
#include "LiquidCrystal_I2C.h"

#define I2C_MASTER_SCL_IO 22 // I2C clock pin
#define I2C_MASTER_SDA_IO 21 // I2C data pin
#define I2C_MASTER_NUM I2C_NUM_0 // I2C port number
#define I2C_MASTER_TX_BUF_DISABLE 0 // I2C transmit buffer disabled
#define I2C_MASTER_RX_BUF_DISABLE 0 // I2C receive buffer disabled
#define LCD_ADDR 0x27 // LCD I2C address
#define LCD_COLS 20 // LCD columns
#define LCD_ROWS 4 // LCD rows

LiquidCrystal_I2C lcd(LCD_ADDR, LCD_COLS, LCD_ROWS); // set the LCD address and dimensions

void i2c_master_init() {
    i2c_config_t conf;
    conf.mode = I2C_MODE_MASTER;
    conf.sda_io_num = I2C_MASTER_SDA_IO;
    conf.sda_pullup_en = GPIO_PULLUP_ENABLE;
    conf.scl_io_num = I2C_MASTER_SCL_IO;
    conf.scl_pullup_en = GPIO_PULLUP_ENABLE;
    conf.master.clk_speed = 100000;
    i2c_param_config(I2C_MASTER_NUM, &conf);
    i2c_driver_install(I2C_MASTER_NUM, conf.mode,
                       I2C_MASTER_RX_BUF_DISABLE,
                       I2C_MASTER_TX_BUF_DISABLE, 0);
}
extern "C"{
void my_app_main() {
    i2c_master_init();
    lcd.init();
    lcd.clear();         
    lcd.backlight(); // make sure backlight is on

    // Print a message on both lines of the LCD.
    lcd.setCursor(2,0); // set cursor to character 2 on line 0
    lcd.print("Hello world!");
  
    lcd.setCursor(2,1); // move cursor to character 2 on line 1
    lcd.print("LCD Tutorial");

    while (1) {
        // your code here
    }
}
}