NET OS 6.1 Training

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NETOS 6.1 Training
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USB HOST
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USB HOST

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

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USB Host Hardware

• Supports USB 1.1 and OHCI 1.0 specifications

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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
  NETOS 6.1 release.
• ISR driven event notification design using
  semaphores.

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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.

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USB Host API

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

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USB Host API

• Memory functions
• usbMalloc()
• usbFree()
• Device class driver functions
• usbRegister()
• usbDeregister()
• usbRegisterIrq()

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USB Host API

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

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USB Host API

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

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USB Host API

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

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USB Host API

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

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USB Device Class Drivers

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

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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

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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)

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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)

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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.

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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.