LCD used: JHD162A(see in my parallel port book for more about it)

 

hex file for lcd program for avr microcontroller(atmega series)

lcd jhd162a interface for atmel avr microcontroller in zip file

This is the simple schematic without using backlight and contrast pins. Here control
pins are connected to PORTD and datapins to PORTA. See the figure below.

/*----------------------------------------------------------------
-------------CONNECTION BETWEEN LCD AND ATMEGA32-----------------
-----------------------------------------------------------------*/
#define DATA_DDR DDRA
#define DATA_PORT PORTA
#define CONTROL_DDR DDRD
#define CONTROL_PORT PORTD
#define Enable_Pin 6
#define RegSelect_Pin 4
#define ReadWrite_Pin 5
#define CONTROL_MASK 0X70
Here are the declaration I am using. Here CONTROL_MASK is used so that remaining pins can be used for other purpose. Change the port settings here so that you can use same code for all ports. When you program you should program in such a way that port pins are not wasted and same program can be used irrespective of ports. So do this at the beginning of the program for better understanding of the program and portability. Practice this when you do programming. Rest program remain same as that I had given my previous book for parallel port.