LCD Interfacing Program with PIC16F877A

#include<pic.h>

#define _XTAL_FREQ 20e6

__CONFIG(0x3F3A);

#define RS RB2

#define EN RB1

#define databits PORTD

/*----------------PIC INITIALIZATION------------*/

void pic_init()

{

    TRISB2 = 0;

    TRISB1 = 0;

    TRISD = 0;

}

 

/*-------------LCD FUNCTIONS BEGIN--------------*/

void LCD_STROBE(void)

{

    EN = 1;

    __delay_us(1);

    EN = 0;

}

 

void data(unsigned char c)

{

    RS = 1;

    __delay_us(50);

    databits = (c >> 4);

    LCD_STROBE();

    databits = (c);

    LCD_STROBE();

}

 

void cmd(unsigned char c)

{

    RS = 0;

    __delay_us(50);

    databits = (c >> 4);

    LCD_STROBE();

    databits = (c);

    LCD_STROBE();

}

 

void clear(void)

{

    cmd(0x01);

    __delay_ms(2);

}

 

void lcd_init()

{

    __delay_ms(15);

    cmd(0x38);

    __delay_ms(1);

    cmd(0x38);

    __delay_us(100);

    cmd(0x38);

    cmd(0x28);            // Function set (4-bit interface, 2 lines, 5*7Pixels)

    cmd(0x28);            // Function set (4-bit interface, 2 lines, 5*7Pixels)

    cmd(0x0c);            // Make cursorinvisible

    clear();            // Clear screen

    cmd(0x6);            // Set entry Mode(auto increment of cursor)

}

 

void string(const char *q)

{

    while (*q) {

        data(*q++);

    }

}

 

/*-------------LCD END--------------------*/

 

main()

{

    __delay_ms(50);

    pic_init();

    lcd_init();

    TRISC = 0;

    while (1) {

        cmd(0x80);

        string("HELLO WORLD");

        cmd(0xc0);

        string("IT IS WORKING:-)");

         

    }

}