USB

Universal Serial Bus 2.0 subsystem. More...

Modules
	USB Core Driver
	USB device model and API for USB device drivers.
	USB Host Controller Driver
	Platform-dependent code to actually send and receive data over the USB.
	USB Hub Driver
	Driver for USB hub devices.

Files
file	usbcore.c
file	usbdebug.c
file	usbhub.c

Functions
syscall	usbinit (void)
syscall	usbinfo (void)

Detailed Description

Universal Serial Bus 2.0 subsystem.

USB support

Function Documentation

syscall usbinfo

(

void

)

Print information about all devices attached to the USB. This uses printf() and therefore should be called with interrupts enabled (e.g. by the shell).

Returns

::SYSERR if USB subsystem is not initialized; ::OK otherwise.

syscall usbinit

(

void

)

Initializes the USB subsystem and corresponding USB and begins the USB device enumeration process. Since USB is a dynamic bus, the enumeration process proceeds in an interrupt-driven manner and continues after this function returns. Thus, there is no guarantee that any given device will be enumerated at any specific time, even after this function returns; this is necessary by the design of USB itself. USB device drivers will be bound to devices as they are found; use usb_register_device_driver() to register a device driver, which can be done at any time (either before or after calling this function).

Returns

OK on success; SYSERR if the USB subsystem was not successfully initialized.