#ifndef _HD44780_H_
#define _HD44780_H_

#define    RS        PORTB_Bit7                // RC4 is RS line of LCD
#define    E        PORTB_Bit6                // RC5 is E line of LCD
#define LCD_DATA    PORTD            // RB0-RB3 are D4-D7 of LCD
#define DISP_ON        0x00C            // Display on
#define CLR_DISP    0x001            // Clear the Display (команда требует задержки на 5 mS)
#define ENTRY_INC    0x006            //
#define LINE1        0x080            // Начало первой линии
#define LINE2        0x0C0            // Начало второй линии
#define CGRAM        0x040            // CGRAM (0-ой переопределяемый символ)

void send_ins(char data);
void send_char(char data);
void init_LCD(void);
int putchar(int data);

#endif  //_HD44780_H_

#include <ioavr.h>
#include <ina90.h>
#include "delay.h"
#include "HD44780.h"

//**************************************************************************
//           Send the nibble of 'data' out to the LCD                      *
//**************************************************************************
void nybble_out(char data)
{
  LCD_DATA = (data & 0x0F) | (LCD_DATA & 0xF0);    
  E = 1;
  _NOP();
  E = 0;
  delay_us(250);                // Задержка 250 uS    
}

//**************************************************************************
//                    Send an instruction out to the LCD                   *
//**************************************************************************
void send_ins(char data)                        
{
  RS = 0;
  _NOP();
  nybble_out(data >> 4);
  nybble_out(data);
}

//**************************************************************************
//                    Send the character out to the LCD                    *
//**************************************************************************
void send_char(char data)
//int putchar(int data)
{
  RS = 1;
  _NOP();
  nybble_out(data >> 4);
  nybble_out(data);
}

//**************************************************************************
//                       Initialize the LCD                                *
//**************************************************************************
void init_LCD(void)
{
  delay_ms(40);                // Задержка 40 mS
  RS = 0;
  nybble_out(0x03);    
  delay_ms(5);                // Задержка 5 mS
  nybble_out(0x02);    
  delay_us(250);                // Задержка 250 uS    
  send_ins(0x28);                // 4 bit, 2 Line, 5x7 font    
  send_ins(0x10);                // display shift off
  send_ins(CLR_DISP);            // Clear the Display RAM
  delay_ms(5);                // Задержка 5 mS
  send_ins(ENTRY_INC);            // increment cursor
  send_ins(0x0C);                // display on cursor off

  send_ins(LINE1);
}

int putchar(int data)
{
  send_char((unsigned char)data);
  return data;
}

void init_LCD(void)
{
  delay_ms(40);                // Задержка 40 mS
  RS = 0;
  nybble_out(0x03);    
  delay_ms(5);                // Задержка 5 mS
  nybble_out(0x03);    
  delay_ms(5);                // Задержка 5 mS
  nybble_out(0x03);    
  delay_ms(5);                // Задержка 5 mS
  nybble_out(0x02);    
  delay_us(250);                // Задержка 250 uS    
  .........