R305 finger print sensor interface to AT89S52 ( Source code only ).

I need someone to modify my existing .c source code . I am working for a finger print door lock system. Schematic and hardware is ready ,source code is almost done except R305 interface. \\\\ (1) Hardware information : MCU-AT89S52, Hardware & Schematic done. LCD-JHD162a , Already Interfaced. FINGERPRINT-R305 (SynoCHIP), Need to Interface. (2) Enroll up to 20 fingerprint. ( to be stored in the R305 module) (3) Add / Delete any fingerprint at the time of initializing. (4) Set button function as required for Add / Delete ( You can use "btn_1" to "btn_5" already defined). (5) If fingerprint matched >> enter "accept()" function. (No need to configure "accept()" function. its ready.) (6) Door can be unlocked by pressing "btn_o" located in side of the room to enter "accept()" function without fingerprint. (No need to configure "accept()" function) (7) Add LCD string as required ( Already Interfaced JHD162a LCD module and code). (8) Project source code to be written in .c language.