MP3 Player/Boombox Kevin Davis Shane Neuville Dan Chao Andy Owens Christopher Tillery ECEN 4610: Capstone Laboratory Preliminary Design Review (PDR)

Project Objectives  Record MP3s off CD-Rom onto hard drive  Play MP3s off of hard drive  Ability to select current track  Ability to stop, pause, rewind, and fast forward  Ability to delete songs  Interactive LCD display  Display artist and song title  Display volume level

Division of Labor Chris: ProcessorProcessor Hard Drive / File StorageHard Drive / File Storage CD-RomCD-Rom Dan: ProcessorProcessor PCBPCB MP3 DecoderMP3 Decoder Shane: Logic / Bus ControlLogic / Bus Control Hard drive / File StorageHard drive / File Storage CD-RomCD-Rom Andy: Logic / Bus ControlLogic / Bus Control PCBPCB LCDLCD Kevin: Logic / Bus ControlLogic / Bus Control PCBPCB User InterfaceUser Interface

FPGA  Xilinx  Bus Arbitration  Glue Logic

File Storage  IDE Hard Drive  Store the songs in mp3 format.  Fat 16  Interface via an 8255 chip  Mp3 Format CD’s  Utilize ID3 tags to separate songs into directories on the hard drive.  User can either play the CD, copy the CD to internal hard drive, or both.

File Storage  Wav format CD’s  User can either play the CD, copy the CD to internal hard drive, or both.  User Specifies CD Name and Artist for wav format CDs.  Files are stored in directories according to Artist and CD.

8255A Chip Description Chip Mode Selection Chip Mode Selection

Processor  Motorola M68HC12BC32

Processing Power  16 bit Address and Data Bus Capability  SCI and SPI serial interface  Interfacing with RS232  Upward Compatible with M68HC11 instruction set

Project Components Processor Data Bus Address Bus FPGA LCD CD RomHard Drive Audio OutDecoder RAMEPROM Keypad

MP3 Encoder/Decoder MAS 3587F

Encoder/Decoder Specs  Internal Clock  ADC/DAC  Encoding up to 192 kbit/s  I2C Serial Interface

ID3 Tag Information  128 bytes at end of MP3 file  Song title: 30 characters  Artist: 30 characters  Album: 30 characters  Year: 4 characters  Comment: 30 characters  Genre: 1 byte

Storage Structure  1 st level of directory structure will be artists name.  2 nd level of directory structure will be CD title  Songs can be stored at any level of the directory structure.

LCD Display - 4x20 characters  Custom Start-up logo  Menu to Choose:  Play Song / Playlist  Copy from CD  Delete Songs  Possible Playlist Editor  Display ID3 tag information: Include at least Song Title and Artist  Playtime and Volume displays possibly using bars

LCD Continued  LCD interacts with keypad through User Interface  LCD display controlled through RS-232 or I2C interface  Buy LCD with controller or use HD44780 chip as controller  Backlight to make viewing easier

Schedule

Cost Estimates  FPGA board: Free (provided by course)  Processor: $15  MP3 Encoder/Decoder: $35  LCD Screen with controller: $60  PCB board: $100  RAM: $10  CD-ROM Drive: Free (used)  Hard Drive: Free (used)  Speakers: Free (used)  Miscellaneous Parts: $100  Labor: Free  Hours spent in basement of engineering center: Priceless  Total Estimated Cost: $320

Positive Impact on Society  Less space wasted by CDs and cases  Eliminates problem of scratched CDs and misplaced CDs  Better parties with greater selection of songs for easier DJing  Adapted to car would result in less accidents caused by careless CD changing  Less CD sales force bands to put on more shows

Negative Impacts  Increased piracy of songs  Less music produced as profits are driven down  Wasted time listening to music may lead to less social interactions  Sound noise may cause deafness  Electrical noise may cause interferences with other devices

Risks and Contingency Plan  Problem with Hard Drive storage system  Simplify folders and file system  Store songs on standard size increments of space to make addressing easier  Problem with reading CD-Rom  Use alternative interface such as USB to upload songs  Preload Mp3s on Hard drive

Risks and Contingency Plan  LCD  Switch to character instead of graphical  Display just file name if ID3 tag information is not available  PCB Board does not work  Debug or redesign layout  Use Protoboard setup

Questions ?????