usb获取bus号和端口号
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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.
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