なお，たとえばデバイス・ディスクリプタの長さは. （現在の仕様では）実質的に12hバイト固定ですが，ホ. ストからは先頭の数バイトしか要求してこないかもし. れません ...
2011/8/25 -Any USB descriptor is limited to 255 bytes since the leading bLength field is one byte wide. The second byte is taken by the bDescriptorType.
2014/7/17 -For the configuration descriptor the wTotalLength field is 2 byte, that would indicate a 64 KB maximum. But you cannot have more than 32 ...
There is a hardcoded limitation of 20 characters for these strings in stdio_usb_descriptors in the SDK (line 123).
The first byte specifies the length of the descriptor, while the second byte indicates the descriptor type. If the length of a descriptor is smaller than ...
2024/1/17 -The first two bytes of the descriptor indicates the total length. The following table shows the configuration descriptor for the USB webcam ...
2021/11/29 -This results in maximum length of HID Report Descriptor to only 255 bytes instead of 65535. This issue is related to USB_Device middleware and ...
2023/11/10 -The purpose of the device descriptor is to let the host know what specification of USB the device complies with and how many possible ...
The Device Descriptor (USB_DEVICE_DESCRIPTOR) is the root of the descriptor tree and contains basic device information.
USB記述子(Descriptor)の構成. 全ての記述子は共通形式で作成されます。最初のﾊﾞｲﾄは記述子の長さ(ﾊﾞｲﾄ数)を示し、第2ﾊﾞｲﾄは記述子種別を表します。記述子. の長さが仕様 ...