- f_close (FIL* fp)     
(    ,    ). 
 fp      ;
- f_mount(unsigned char vol, FATFS *fs)    
    ,    
    FAT     . 
 vol     ( 0  9), fs  
   ,     ;
- f_read(FIL* fp, void* buff, unsigned int btr, unsigned int* br)  
     
 ,  fp      , 
buff      , btr    
 , br     ;
