Every USB device exposes a device descriptor that indicates the device's class information, vendor and product identifiers, and number of configurations. Each configuration exposes it's configuration descriptor that indicates number of interfaces and power characteristics.
2024年1月17日
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All USB devices have a hierarchy of descriptors which describe to the host information such as what the device is, who makes it, what version of USB it ...
2024/01/17 · Every Universal Serial Bus (USB) device must be able to provide a single device descriptor that contains relevant information about the device.
USB devices report their attributes using descriptors, which are data structures with a defined format. Each descriptor begins with a byte-wide field ...
2023/11/10 · Each Universal Serial Bus (USB) device has a set of descriptors. The descriptors are read by the host during enumeration.
The Device Descriptor (USB_DEVICE_DESCRIPTOR) is the root of the descriptor tree and contains basic device information. The unique numbers, idVendor and ...
The BOS descriptor defines a root descriptor that is similar to the configuration descriptor, and is the base descriptor for accessing a family of related ...
The device descriptor of a USB device represents the entire device. As a result a USB device can only have one device descriptor.
There are two places on a device where class code information can be placed. One place is in the Device Descriptor, and the other is in Interface Descriptors.
2020/08/11 · USB descriptors are presented to the host during the enumeration process. These descriptors tell the host what type of device is connected and ...