[help] Configuration LCD hd44780

i want your help to verify my program "interfacing LCD hd44780"
this is my program using m32c87 ,20 MHz, it doesn't work !!

//**********************************************************
#define RS p3_0
#define RW p3_1
#define E p3_2
#define BF p3_7

void tpo(void)
{
unsigned char k;
for(k=0;k<250;k++) ;
}


void tempo(short duree_us)
{
ta0mr=0x00;
ta0=20*duree_us;
ta0ic=0x00;
ta0s=1;
while(ir_ta0ic==0);
ta0s=0;
}
void busy(void)
{

RS=0;
RW=1;
E=1;
pd3=0x00;
while(BF==1);
pd3=0xff;
E=0;
RW=0;


}
void lcd_com(unsigned char cmd)
{
busy();
RS=0;
RW=0;
E=0;
p3=(cmd & 0xf0);
E=1;
tempo(1000);
E=0;
p3=((cmd << 4)& 0x0f);
E=1;
tempo(1000);
E=0;

}
//initialization of screen display
void init_lcd(void)
{
pd3=0xff;
p3=0x00;
RS=0;
RW=0;
E=0;
lcd_com(0x03);
lcd_com(0x28);
lcd_com(0x06);
lcd_com(0x0e);
lcd_com(0x01);
}

void write_to_lcd(unsigned char car)
{
busy();
RS=1;
RW=1;
E=0;
p3=(car & 0xf0);
E=1;
tempo(1000);
E=0;
p3=((car << 4) & 0xf0);
E=1;
tempo(1000);
E=0;
}
// Global function
void main(void)
{
init_lcd();
write_to_lcd('b');
while(1);
}
//******************************************
PLEASE HELP ME