NET+OS 6.1 Training

USB HOST

• USB Host Hardware• USB Host Stack• USB Host API• USB Device Class Drivers• Recommended readings

USB HOST

USB Host Hardware

• Supports USB 1.1 and OHCI 1.0 specifications

USB Host Stack

• Sourced from a Minolta and based on the Linux USB Host stack design.

• Supports bulk transfers, control transfers and interrupt transfers.

• Isochronous transfers are not supported in the NET+OS 6.1 release.

• ISR driven event notification design using semaphores.

USB Host Stack

• USB stack has an internal thread which processes root hub status change events as notified by the ISR

• Root hub status changes force the internal thread to enumerate or de-enumerate devices.

USB Host API

Initialization functions:• usbHostInit()• usbKeyboardInit()• usbMouseInit()• usbHubInit()• usbPrinterInit()

USB Host API

Memory functions:• usbMalloc()• usbFree()

Device class driver functions:• usbRegister()• usbDeregister()• usbRegisterIrq()

USB Host API

Enumeration functions:• usbClearEndPointFeature()• usbClearFeature()• usbClearPortFeature()• usbGetConfiguration()• usbGetDeviceDescriptor()• usbGetHidDescriptor()

USB Host API

• usbGetHubDescriptor()• usbGetHubStatus()• usbGetPortStatus()• usbGetProtocol()• usbGetStatus()• usbGetString()• usbSetConfiguration()

USB Host API

• usbGetHubDescriptor()• usbGetHubStatus()• usbGetPortStatus()• usbGetProtocol()• usbGetStatus()• usbGetString()• usbSetConfiguration()

USB Host API

• usbSetFeature()• usbSetIdle()• usbSetInterface()• usbSetPortFeature()• usbSetProtocol()• usbSetReport()

USB Device Class Drivers

Devices supported for this release:• Hub• Keyboard• Mouse• Printer

USB Device Class Drivers

Hub Driver:• Uses an interrupt endpoint to communicate

with the hub device• ISR driven event notification design

through semaphore• Internal thread processes hub port status

changes and enumerates (or de-enumerates) as needed

USB Device Class Drivers

Keyboard Driver:• Uses an interrupt endpoint to communicate

with the keyboard device• ISR driven event notification• Directs keystrokes to the console through

the standard I/O (i.e. serial port)

USB Device Class Drivers

Mouse Driver:• Uses an interrupt endpoint to communicate

with the mouse device• ISR driven event notification• Directs mouse position coordinates to the

console through the standard I/O (i.e. serial port)

USB Device Class Drivers

Printer Driver:• Uses one bulk out endpoint to communicate

with the printer device.• Tested with the Hitachi SL5 printer• Will work with printer devices that allow

directly downloading the actual print image without any protocols.

Recommended Readings

• USB 1.1 Specification• OHCI 1.0 Specification• USB Human Interface Devices (HID)

specification• USB related books that explain USB in less

abstract terms.