1 / 20

USB Mass-Storage Implementation on an Embedded System (D0113)

USB Mass-Storage Implementation on an Embedded System (D0113). Final Presentation – 20/4/2004. Supervisor: Dimitry Sokolik Performed by: Yoav Gershoni Shachar Faigenblat. HSDS LAB Technion - Winter 2003. Project overview.

joyce
Download Presentation

USB Mass-Storage Implementation on an Embedded System (D0113)

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. USB Mass-Storage Implementationon an Embedded System(D0113) Final Presentation – 20/4/2004 Supervisor: Dimitry Sokolik Performed by: Yoav Gershoni Shachar Faigenblat HSDS LAB Technion - Winter 2003

  2. Project overview The project provides generic means to read files from a FAT32 formatted USB-Flash-Disk. • Stage A: PC implementation: all the logic and the protocol layers will be implemented on the PC. • Stage B: Full on board implementation (hardware & application).

  3. Block Diagram Stage A: PIC Evaluation Board Flat Cable 23 bits Parallel Connection USB Host Controller USB BUS Pic Microprocessor RS 232

  4. Block Diagram Stage B: PIC Evaluation Board Flat Cable 23 bits Parallel Connection USB Host Controller USB BUS Pic Microprocessor The application will be implemented on the PIC itself

  5. Project Specification • Components: • PIC 18F452 evaluation board. • Philips ISP1362 USB Host Controller. • Power supply: • 9v from external PS converted to 5v and 3.3v. • 5v for the evaluation board, PIC and USB bus. • 3.3v for the host controller. • Interfaces: • USB bus between Flash Disk and Host Controller. • parallel bus between PIC ports and Host Controller. • RS-232 bus between the PC and the PIC board.

  6. Project Specification – Cont’ • Connectors: • Type A USB connector. • D-Type-9 connector. (for RS-232 – already exists on the evaluation board and on PC).

  7. Project background • Stand alone device. • Stage A: Application on the PC. • Microprocessor instead of FPGA to control the USB HC. • Future implementations - MP3 decoder.

  8. Software Architecture Logical File System Layer FAT16/FAT32 Command Set Protocol Using SCSI Primary Command Set USB Mass-Storage Class Using Bulk-Only Transport protocol Host Controller Driver PC – PIC Communication

  9. Software Development Tools • PIC: • MCC18 compiler on MPLAB IDE. • PC: • Code in C, with Visual Studio compiler. • USB protocol: • USB Inspector.

  10. Project Status • PC-PIC Communication. • HC Board. • USB Protocol Analysis.

  11. PIC-HC Connection • HC has 16 I/O bits. • Command or Data Control bit (A0). • Method: • Send Command. (A0=‘1’) • Send/Receive Data. (A0=‘0’)

  12. Writing 16/32 bits to HC

  13. PC-PIC Protocol • Over RS232.115200bps, 8 bits, no parity, 1 stop bit. • Transactions has Command and Data.

  14. Software Design • PC-PIC Connection Protocol Design. • Learn RS232 Communication on PC. • RS232 on PIC using Lee & Ehud LIB. • Implementation of PC-PIC Protocol on PC and PIC.

  15. HC Board – Design • Connection To PIC (ports assignment) • Buffers to Convert Logical Levels: 5v <-> 3.3v • Power Supply: 5v, 3.3v • USB Connector with Over Current Sense. • Good Link Led. • Manual Reset. • Clock.

  16. USB Protocol Analysis • SCSI Commands – Understanding. • SCSI Commands – Specifications Drafts not Final.

  17. The End

  18. PC-PIC Protocol

  19. Ports Table

More Related