First of all you need a basic knowledge of C lang….
by the way it is not star but is is called as a POINTER…..
void lcd_data(unsigned char *disp)
{
while(*disp)
lcd_disp(*disp++);
}
explanation..
while(*disp) is conditional statament if Your character is not null ( ‘ ’ ) then and then lcd_disp(*disp++); executed and then due to Post increment Next address is came in pointer…and again while(*disp) condition check if it not null then display on lcd otherwise condition of loop is false and loop is terminated…
So Pointer is gives You a address Of your Variables…
Like wise
Disp[8]=”SHAILESH” stored at 0x00H then
*Disp will giive your a Address Of Disp[0] Not ‘S’;