2x16 lcd 1-wire ile yazı yazma

#include <18f4520.h>
#include <string.h>
#fuses XT, NOWDT, NOPROTECT, NOBROWNOUT, NOLVP, NOPUT, NOWRT, NODEBUG, NOCPD
#use delay(clock=20M)

void lcd_putc(unsigned char c);
void lcd_command(unsigned char c);
void lcd_init();
void lcd_clear(void);
void lcd_position(unsigned char x,unsigned char y);
void lcd_printf(char *a);
void one_wire(unsigned char data);

void main()
{
   set_tris_b(0x00);  
   lcd_init();
   
   while(TRUE)
   {
      lcd_printf("Deneme");
   }
}



void lcd_putc(unsigned char c )
{
   unsigned char data;
    data = 0x00;
    data |=0x50;
    one_wire(data);
    data |= ((c & 0xF0)>>4);
    one_wire(data);
    data &= 0x1F;
    one_wire(data);
    delay_us(100);
   
    data = 0x00;
    data |= 0x50;
    one_wire(data);
    data |= (((c & 0x0F) << 4) >> 4);
    one_wire(data);
    data &= 0x1F;
    one_wire(data);
    delay_us(100);
}

void lcd_command(unsigned char c)
{
   unsigned char data;
    data = 0x00;
    data |=0x40;
    one_wire(data);
    data |= ((c & 0xF0)>>4);
    one_wire(data);
    data &= 0x0F;
    one_wire(data);
    delay_us(100);
   
    data = 0x00;
    data |= 0x40;
    one_wire(data);
    data |= (((c & 0x0F) << 4) >> 4);
    one_wire(data);
    data &= 0x0F;
    one_wire(data);
    delay_us(100);

}


void lcd_init()
{
    one_wire(0);
    delay_ms(15);
    lcd_command(2);
    delay_ms(2);
    lcd_command(40);   
    lcd_command(6);   
    lcd_command(12);   
    lcd_clear();


    lcd_command(128);
}


void lcd_clear(void)
{
    lcd_command(0x1);
    delay_ms(2);
}

void lcd_position(unsigned char x,unsigned char y)
{
    if(x==1)
        lcd_command(0x80+((y-1)%20));
    else
        lcd_command(0xC0+((y-1)%20));
}

void lcd_printf(char *a)
{
    delay_us(100);
    while(*a)
    {
        lcd_putc(*a++);
    }
}

void one_wire(unsigned char data)
{
    char i;
    output_high(pin_b0);
    for(i=0;i < 8;i++)
    {
        if((data<<(i))&0x80)
        {
            output_low(pin_b0); 
            //delay_us(1);
            output_high(pin_b0);
        }
        else
        {
            output_low(pin_b0); 
            delay_us(15);
            output_high(pin_b0);
            delay_us(30);
        }
    }
    output_low(pin_b0); 
    delay_us(210);
    output_high(pin_b0);
    delay_us(300);
}