LCD INTREFACE TO PIC18f4550 (4-bit mode)

C CODE:                  

/****************************************************************

NAME:MOHSIN KHAN

AIM:TO INTERFACE AN 16*2 LCD TO PIC18F4550 IN A 4-BIT MODE.

****************************************************************/

#include<p18f452.h>

//LCD Control pins

#define rs PORTDbits.RD0

#define rw PORTDbits.RD1

#define en PORTDbits.RD2

//LCD Data pins

#define sdata PORTD

voidlcd_ini(void);

void lcd_ini1(void);

voiddis_cmd(unsigned char);

voiddis_data(unsigned char);

voidlcdcmd(unsigned char);

voidlcddata(unsigned char);

void delay(unsigned int);

voidprint_string(char *a);

void main(void)

{

          char data0[]="   MULTIAXIS  ";

          char data1[]="BLDC MOTOR";

          unsignedinti=0;

          TRISD=0;                     // Configure Port D as output port

          lcd_ini();                        // LCD initialization

          print_string(data0);

          lcd_ini1();

          print_string(data1);

         

         

}

voidlcd_ini()       

{

          dis_cmd(0x02);            // To initialize LCD in 4-bit mode.

          dis_cmd(0x20);            // To initialize LCD in 2 lines, 5x7 dots and 4bit mode.

          dis_cmd(0x0C);

          dis_cmd(0x06);

          dis_cmd(0x80);

}

void lcd_ini1()    

{

dis_cmd(0x0C);

                   dis_cmd(0x06);

          dis_cmd(0xC0);

}

voiddis_cmd(unsigned char cmd_value)

{

          unsigned char cmd_value1;

          cmd_value1 = (cmd_value& 0xF0);       // Mask lower nibble because RD4-RD7 pins are being used

          lcdcmd(cmd_value1);                     // Send to LCD

          cmd_value1 = ((cmd_value<<4) & 0xF0);       // Shift 4-bit and mask

          lcdcmd(cmd_value1);                     // Send to LCD

}

voiddis_data(unsigned char data_value)

{

          unsigned char data_value1;

          data_value1=(data_value&0xF0);

          lcddata(data_value1);

          data_value1=((data_value<<4)&0xF0);

          lcddata(data_value1);

}

voidlcdcmd(unsigned char cmdout)

{

          sdata=cmdout;             //Send command to lcdport=PORTB

          rs=0;                                                

          rw=0;

          en=1;

          delay(2);

          en=0;

}

voidlcddata(unsigned char dataout)

{

          sdata=dataout;   //Send data to lcdport=PORTB

          rs=1;

          rw=0;

          en=1;

          delay(2);

          en=0;

}

voidprint_string(char *a)

{

inti;

for(i=0;(*(a+i))!='\0';i++)

   {

dis_data(*(a+i));

          delay(2);

         

   }

}

void delay(unsigned int d)

{

          unsignedinti,j;

          for(i=0;i<d;i++)

                   for(j=0;j<300;j++);

}