4 bit lcd display(PC066PGL) not working with PIC16F877A micro controller

#pragma config FOSC = HS        // Oscillator Selection bits (XT oscillator)
#pragma config WDTE = OFF       // Watchdog Timer Enable bit (WDT disabled)
#pragma config PWRTE = ON       // Power-up Timer Enable bit (PWRT enabled)
#pragma config BOREN = ON       // Brown-out Reset Enable bit (BOR enabled)
#pragma config LVP = OFF        // Low-Voltage (Single-Supply) In-Circuit Serial Programming Enable bit (RB3 is digital I/O, HV on MCLR must be used for programming)
#pragma config CPD = OFF        // Data EEPROM Memory Code Protection bit (Data EEPROM code protection off)
#pragma config WRT = OFF        // Flash Program Memory Write Enable bits (Write protection off; all program memory may be written to by EECON control)
#pragma config CP = OFF         // Flash Program Memory Code Protection bit (Code protection off)

#include<xc.h>
#include"lcd.h"
#define _XTAL_FREQ 20000000

int main()
{
    TRISB = 0X00;                               // Configure all the LCD pins as output
    PORTB = 0X00;
    
    char i,a[]={"Good morning!"};

    lcd_init();
     
    lcd_write('H');
    lcd_write('e');
    lcd_write('l');
    lcd_write('l');
    lcd_write('o');
    lcd_write(' ');
    lcd_write('w');
    lcd_write('o');
    lcd_write('r');
    lcd_write('l');
    lcd_write('d');

    lcd_goto(0xc0);                            //Go to Next line and display Good Morning
    lcd_data(a);
    while(1);
}

#include<xc.h>
#include"lcd.h"
#define _XTAL_FREQ 20000000


//*********************************************************// 
#define LCD_RS PORTBbits.RB5	// Register select
#define LCD_EN PORTBbits.RB4	// Enable


//*********************************************************//
// write a byte to the LCD in 4 bit mode 
//*********************************************************//
void lcd_write(unsigned char c)
{
	PORTB = (PORTB & 0xF0) |  (c >> 4);                // Send higher nibble
	LCD_EN = 1;
    LCD_EN = 0;
	PORTB = (PORTB & 0xF0) |  (c & 0x0F);              // Send lower nibble
	LCD_EN = 1;
    LCD_EN = 0;
	__delay_ms(40);
}
//*********************************************************//
// 	Clear and home the LCD
//*********************************************************//
void lcd_clear(void)
{
	LCD_RS = 0;
	lcd_write(0x1);
	__delay_ms(2);
}
//*********************************************************//
// write a string of chars to the LCD 
//*********************************************************//
void lcd_data(const char *s)
{
	LCD_RS = 1;	// write characters
	while(*s)
		lcd_write(*s++);
}


//*********************************************************//
// Go to the specified position
//*********************************************************//
void lcd_goto(unsigned char pos)
{
	LCD_RS = 0;
	lcd_write(0x80+pos);
}
//*********************************************************//	
// initialise the LCD - Put into 4 bit mode 
//*********************************************************//
void lcd_init(void)         
{
	LCD_RS = 0;                     // write control bytes
	__delay_ms(15);                 // power on delay
	PORTB = 0x3;                    // attention!
	LCD_EN = 1;
    LCD_EN = 0;
	__delay_ms(5);
	LCD_EN = 1;
    LCD_EN = 0;
	__delay_ms(100);
	LCD_EN = 1;
    LCD_EN = 0;
	__delay_ms(5);
	PORTB = 0x2;                    // to set 4 bit mode
	LCD_EN = 1;
    LCD_EN = 0;
	__delay_ms(40);
	lcd_write(0x28);                // 4 bit mode, 1/16 duty, 5x8 font
	lcd_write(0x08);                // display off
//	lcd_write(0x0F);                // display on, blink curson on
	lcd_write(0x0C);                // display on, cursor off, blink off
	lcd_write(0x06);                // entry mode
  //  lcd_write(0x80);              // Move the cursor to beginning of first line
    
}

/* write a byte to the LCD in 4 bit mode */

extern void lcd_write(unsigned char);

/* Clear and home the LCD */

extern void lcd_clear(void);

/* write a string of characters to the LCD */

extern void lcd_data(const char *s);

/* Go to the specified position */

extern void lcd_goto(unsigned char pos);
	
/* intialize the LCD - call before anything else */

extern void lcd_init(void);

extern void lcd_putch(char);

/*	Set the cursor position */

#define	lcd_cursor(x)	lcd_write(((x)&0x7F)|0x80)

LCD_EN = 1;
LCD_EN = 0;