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How long is the string of manufacturer of a USB device? - Stack Overflow

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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 ...


What's the maximum size of a USB descriptor?

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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 ...


Hardcoded USB descriptor string length limit in stdio_usb_descriptors.c

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I tried 127 and it works with the code I posted above. If I define the maximum to be 128, it works correctly for strings up to 127 characters in length, but ...


USB in a NutShell - Chapter 5 - USB Descriptors - Beyondlogic

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All descriptors are made up of a common format. The first byte specifies the length of the descriptor, while the second byte indicates the descriptor type. If ...


USB HID Report Descriptor length greater than 255 bytes not supported

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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 ...


Standard USB Descriptors - Windows drivers - Microsoft Learn

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2024/1/17 -Therefore, only the initial portion of a configuration descriptor is fixed, 9 bytes. The rest is variable depending on the number of interfaces ...


Configuration Descriptor - USB Component - Keil

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  2. _u_s_b__configuration__descriptor

The Configuration Descriptor (USB_CONFIGURATION_DESCRIPTOR) contains information about the device power requirements and the number of interfaces it can ...


USB2.0概説 - AVR.jp

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USB記述子(Descriptor)の構成. 19. 装置記述子(Device ... USBはﾃﾞｰﾀ用に1対の差動送信を使います。これはNRZI ... これは出力(OUT)指示票(ﾄｰｸﾝ)ﾊﾟｹｯﾄとそれに続くﾃﾞｰﾀ部のない ...


Part 4 - Protocol - USB Made Simple

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The host needs to know the max packet length in use by the control endpoint and this information is available in the 8th byte of the device descriptor.


USB descriptors - libusb

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  2. group__libusb__desc

... USB Device Capability descriptor This descriptor is documented in section 9.6. ... length). Retrieve a descriptor from the default ... endpoint descriptor from ...