LCD DISLPLAY QUESTION

[WHUNG.JOHN]

TODAY .
I WRITTEN A SAMPLE LCD DISPLAY PROGRAM.AND NOT USE LCD.C (LIBRARY PROGRAM).
I used lcd.c library program .display any value correct.
but i tried written lcd display,and writted into pic16f877 chip.
the lcd dont display any vlaue.
my writted program. follow as .
i dont find error.please help me again.


#include <16F877.h>
#use delay(clock=10000000)
#fuses NOWDT,HS

void del (void)
{
int j;
for (j=0;j<20;j++);
}


void en1(void)
{
output_high(pin_d0);
del();
output_low(pin_d0);
del();
}

void write_com(unsigned char C)
{
output_d(C);
output_LOW(pin_d1); en1();C<<=4;
output_d(C);output_LOW(pin_d1);en1();
}

void init_lcd1(void)
{
output_d(0x30); en1();
output_d(0x30); en1();
output_d(0x30); en1();
output_d(0x20); en1();
write_com(0x28);
write_com(0x08);
write_com(0x01);
write_com(0x0c);
//write_com(0x0F);
delay_ms(100);




}

void write_data(unsigned char C)
{
output_d(C);
output_high(pin_d1); en1();C<<=4;
output_d(C);output_high(pin_d1);en1();
}

void pr(char x,char *y)
{
int i;
if (x==1)
{
write_com(0x80);
for(i=0;i<16;i++) write_data(' ');
write_com(0x80);}
else
{write_com(0xc0);
for (i=0;i<16;i++) write_data(' ');
write_com(0xc0);}

do {write_data(*y++);}
while(*y!='\0');
}

pr1(char t,char w)
{
write_com(0x80+t);
write_data(w);
}


void main()
{
char p[]="1234";
char k[]="5678";
output_low(pin_d0);
delay_ms(100);
init_lcd1();
pr(2,p);
pr1(5,k);

while(1)
{

}

}

[PCM programmer]