showing the data on characteristic lcd 2*16 with microblaze on fpga .

[moein0114]

hi , i am using the microblaze to calculate some thing and after that i want to show it on the lcd i have on my board . i ddidnt know exactly how to do it , so i searched and now i want to use this code to run the lcd for now :

#include<stdio.h>
#include<xparameters.h>
#include<xgpio.h>
XGpio e,rs,rw,lcd_data;
char reverse(char data)
{
     int i;
     int temp1;
     int temp2=0;
     for(i=0;i<8;i++)
     {
         temp1 = (data>>i)&1;
         temp2+= temp1 << (7-i);
     }
     return temp2;
}

void delay(int counter)
{
       while(counter) counter--;
}

void gpio_init (void)
{
     XGpio_Initialize(&e, XPAR_E_DEVICE_ID);
     XGpio_Initialize(&rs, XPAR_RS_DEVICE_ID);
     XGpio_Initialize(&rw, XPAR_RW_DEVICE_ID);
     XGpio_Initialize(&lcd_data, XPAR_DATA_IN_DEVICE_ID);
     /*Set the all GPIOs as output*/
     XGpio_SetDataDirection(&e,1,0);
     XGpio_SetDataDirection(&rs,1,0);
     XGpio_SetDataDirection(&rw,1,0);
     XGpio_SetDataDirection(&lcd_data,1,0);
}
void lcd_command(char i)
{
     XGpio_DiscreteWrite(&lcd_data,1,reverse(i));
     XGpio_DiscreteWrite(&rs, 1, 0);
     XGpio_DiscreteWrite(&e, 1, 1);
     XGpio_DiscreteWrite(&e, 1, 0);
     delay(200000);
}

void lcd_write(char i)
{
      XGpio_DiscreteWrite(&lcd_data, 1, reverse(i));
      XGpio_DiscreteWrite(&rs, 1, 1);
      XGpio_DiscreteWrite(&e, 1, 1);
      XGpio_DiscreteWrite(&e, 1, 0);
      delay(200000);
}

void cursor(int row, int column)
{
      if(row==1)
            lcd_command(0x80|(column-1));
      if (row==2)
           lcd_command(0x80|(0x40+(column-1)));
}

int main(void)
{
       gpio_init();
       XGpio_DiscreteWrite(&rw,1,0);
       delay(20000);
 lcd_command(0x28);  // in dasture chek shode hastesho malume chi b chie , faghat bahse cursor mimuen chie ????
       lcd_command(0x01);
       lcd_command(0x06);
       lcd_command(0x0F);

       lcd_write('F');
       lcd_write('P');
       lcd_write('G');
       lcd_write('A');
       cursor(2,1);
       lcd_write('C');
       lcd_write('E');
       lcd_write('N');
       lcd_write('T');
       lcd_write('E');
       lcd_write('R');
       return 0;
}

i have problems ,
does any body know , what is reverse() doing here ?
i am using characteristic lcd 2*16 and i have considered the commands for my lcd kind .
i just have problem with reverse ().
what am i missing here ?