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

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).

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

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

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.

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

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

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

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

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

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’)

Writing 16/32 bits to HC

PC-PIC Protocol   Over RS bps, 8 bits, no parity, 1 stop bit.   Transactions has Command and Data.

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.

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.

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

PC-PIC Protocol

Ports Table