LCD just show grey square box

#include <16F877A.h>
#fuses hs, nowdt, nolvp, noprotect   //Config
#use delay (clock = 20000000)      //20MHz Crystal

void init(void);      //Function Prototype
void busy_test(void);
void display(void);
void send_command(void);
void send_data(void);

unsigned char PORTC, TRISC, PORTD, TRISD, RS, RW, E, BF;
unsigned char command, data;

#byte PORTC = 0x07
#byte TRISC = 0x87
#byte PORTD = 0x08
#byte TRISD = 0x88

#bit RS = PORTC.0
#bit RW = PORTC.1
#bit E  = PORTC.2
#bit BF = PORTD.7

void main()
{
   init();
   display();
   while (1)
   {

   }   
}

void init()
{
   PORTC = 0x00;   //Clear Port C
   PORTD = 0x00;   //Clear Port D

   TRISC = 0x00;   //Set Port C As Output
   TRISD = 0x00;   //Set Port D As Output

   delay_ms (500);   //Power-On Delay
         //Busy Flag Valid Here

   //busy_test();   //Check Busy Flag
   command = 0x38;   //8-Bits, 2-Lines, 5x7 Dots
   send_command();   //Send Command To LCD

   delay_ms (10);

   //busy_test();   //Check Busy Flag
   command = 0x38;   //8-Bits, 2-Lines, 5x7 Dots
   send_command();   //Send Command To LCD

   delay_us (500);

   //busy_test();   //Check Busy Flag
   command = 0x38;   //8-Bits, 2-Lines, 5x7 Dots
   send_command();   //Send Command To LCD

   delay_ms (1);

   busy_test();   //Check Busy Flag
   command = 0x38;   //8-Bits, 2-Lines, 5x7 Dots
   send_command();   //Send Command To LCD

   delay_ms (1);

   busy_test();   //Check BF
   command = 0x08;   //Display Off, Cursor Off, No-Blink
   send_command();   //Send

   delay_ms (1);

   busy_test();
   command = 0x01;   //Clear Display
   send_command();

   delay_ms (5);

   busy_test();
   command = 0x06;   //Increment Cursor Position, No-Shift
   send_command();

   delay_ms (1);

   busy_test();
   command = 0x0F;   //Display On, Cursor On, Blink
   send_command();

   delay_ms (1);
}


void display()
{

   busy_test();
   command = 0x80;   //Set DDRAM Address To 0x00
   send_command();

   delay_ms (1);

   busy_test();
   data = 0x50;   //Display "P"
   send_data();

   delay_ms (1);

   busy_test();
   command = 0xC0;   //Set DDRAM Address To 0x40
   send_command();

   delay_ms (1);

   busy_test();
   data = 0x4C;   //Display "L"
   send_data();

   delay_ms (1);

}


void busy_test()
{
   while (1)
   {
      TRISD = 0xFF;      //Set Port D As Input
      //RS = 0;            //Command
      //RW = 1;            //Read Busy Flag
      PORTC = 0x02;

      delay_cycles (2);   //Control Setup Time
      //E  = 1;            //E-Line High
      PORTC = 0x06;

      delay_cycles (6);   //Wait Data Return

      if (BF == 0)
      {
         TRISD = 0x00;   //Set Port D Back To Output
         //E  = 0;         //E-Line Low
         PORTC = 0x02;
         return;
      }

      //E  = 0;            //E-Line Low
      PORTC = 0x02;
   }      //End while loop
}      //End Function


void send_command()
{   
   //RS = 0;            //Command
   //RW = 0;            //Write Instruction
   PORTC = 0x00;

   delay_cycles (2);   //Control Setup Time
   //E  = 1;            //E-Line High
   PORTC = 0x04;

   delay_cycles (3);   
   PORTD = command;   //Put Command To Port D

   delay_cycles (3);   //Data Setup Time
   //E  = 0;            //E-Line Low
   PORTC = 0x00;
   delay_cycles (1);   //Control & Data Hold Time
}


void send_data()
{
   //RS = 1;            //Data
   //RW = 0;            //Write data
   PORTC = 0x01;
   
   delay_cycles (2);   //Control Setup Time
   //E  = 1;            //E-Line High
   PORTC = 0x05;

   delay_cycles (3);
   PORTD = data;      //Put Data To Port D

   delay_cycles (3);   //Data Setup Time
   //E  = 0;            //E-Line Low
   PORTC = 0x01;
   delay_cycles (1);   //Control & Data Hold Time
}

void send_data()
{
   //RS = 1;            //Data
   //RW = 0;            //Write data
   PORTC = 0x01;
   
   delay_cycles (3);
   PORTD = data;      //Put Data To Port D

   delay_cycles (2);   //Control Setup Time
   //E  = 1;            //E-Line High
   PORTC = 0x05;

   delay_cycles (3);   //Data Setup Time
   //E  = 0;            //E-Line Low
   PORTC = 0x01;
   delay_cycles (1);   //Control & Data Hold Time
}