# 2014-09-24 | Raspberry PI + YwRobot Arduino LCM1602 IIC V1 HD44780 LCD
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liblcm1602

  Finally i have some time to write a new post.

  Let's start:
  I bought a YwRobot Arduino LCM1602 IIC V1 HD44780 LCD from Amazon for 6,57 EUR.

  It has a I2C interface (so it will use just 2 cables, SDA & SCL, VCC & GND).

  I found some tutorials online, but they were for Arduino or python... NOTHING FOR C !
  So i decided to write a damn C lib for this component.
  I had to cross check various codes/datasheets to understand how it works, but at the
  end i wrote it.

  So, this is my lib! Enjoy it ;)

  You can grab from here



  #include <stdio.h>
  #include <string.h>
  #include "i2c.h"
  #include "lcd.h"

  #define I2C_FILE_NAME "/dev/i2c-0"

  const char* txt[]  = {
      "I work on the PI",
      "via liblcm1602.a"
  };

  int main() {
      int i2c_dev;
      lcd lcd0;
      // 0x27 is the address of the i2c device
      i2c_dev = open_i2c (I2C_FILE_NAME, 0x27);
      if (i2c_dev < 0) {
         printf ("Error: %d\n", i2c_dev);
         return 1;
      }
      lcd_init (&lcd0, i2c_dev);
      lcd_clear (&lcd0);
      lcd_print (&lcd0, txt[0], strlen(txt[0]), 0);
      lcd_print (&lcd0, txt[1], strlen (txt[1]), 1);
      close_i2c (i2c_dev);
      return 0;
  }



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