usb获取bus号和端口号

摘自：http://libusb.sourceforge.net/api-1.0/group__libusb__dev.html#gaf2718609d50c8ded2704e4051b3d2925

uint8_t libusb_get_bus_number

(

libusb_device *

dev

)

Get the number of the bus that a device is connected to.

Parameters

dev

a device

Returns

the bus number

◆ libusb_get_port_number()

uint8_t libusb_get_port_number

(

libusb_device *

dev

)

Get the number of the port that a device is connected to. Unless the OS does something funky, or you are hot-plugging USB extension cards, the port number returned by this call is usually guaranteed to be uniquely tied to a physical port, meaning that different devices plugged on the same physical port should return the same port number.

But outside of this, there is no guarantee that the port number returned by this call will remain the same, or even match the order in which ports have been numbered by the HUB/HCD manufacturer.

Parameters

dev

a device

Returns

the port number (0 if not available)

◆ libusb_get_port_numbers()

int libusb_get_port_numbers	(	libusb_device *	dev,
		uint8_t *	port_numbers,
		int	port_numbers_len
	)

Get the list of all port numbers from root for the specified device

Since version 1.0.16, LIBUSB_API_VERSION >= 0x01000102

Parameters

dev	a device
port_numbers	the array that should contain the port numbers
port_numbers_len	the maximum length of the array. As per the USB 3.0 specs, the current maximum limit for the depth is 7.

Returns

the number of elements filled

LIBUSB_ERROR_OVERFLOW if the array is too small

◆ libusb_get_port_path()

int libusb_get_port_path	(	libusb_context *	ctx,
		libusb_device *	dev,
		uint8_t *	port_numbers,
		uint8_t	port_numbers_len
	)

Deprecated please use libusb_get_port_numbers instead.