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RM0319 データシート(PDF) 46 Page - STMicroelectronics |
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RM0319 データシート(HTML) 46 Page - STMicroelectronics |
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46 / 368 page  BootROM RM0319 46/368 Doc ID 022640 Rev 3 USB descriptors As part of the process, several descriptors are exchanged. A detailed description is provided below: 1. Device Descriptors: Each gadget has one device descriptor. 2. Configuration descriptors: Each device has one default configuration descriptor which supports at least one interface. Table 9. Device descriptor Offset Field Size Value 0 bLength Byte 0x12 1 bDescriptorType Byte 0x01 2 bcdUSB Word 0x200 4 bDeviceClass Byte 0x00 5 bDeviceSubClass Byte 0x00 6 bDeviceProtocol Byte 0x00 7 wMaxPacketSize0 Byte 0x40 8 idVendor Word 0x0483 10 iProduct Word 0x3801 12 bcdDevice Word 0x100 14 iManufacturer Byte 0x01 15 iProduct Byte 0x02 16 iSerial Number Byte 0x03 17 bNumConfigurations Byte 0x01 Table 10. Configuration descriptor Offset Field Size Value 0 bLength Byte 0x09 1 bDescriptorType Byte 0x02 2 bTotalLength Word 0x0020 4 bNumInterfaces Byte 0x01 5 bConfigurationValue Byte 0x01 6 iConfiguration Byte 0x00 7 bmAttributes Byte 0xE0 8 MaxPower Byte 0x00 |
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