Using USB-DFU Protocol
| Offset | Field | Size | Value | Descripton |
|---|---|---|---|---|
| 0 | bLength | 1 | 12h | Size of this descriptor,in bytes. |
| 1 | bDescriptorType | 1 | 01h | DEVICE descriptor type. |
| 2 | bcdUSB | 2 | 0100h | USB specification release number in binary coded decimal. |
| 4 | bDeviceClass | 1 | 00h | See interface. |
| 5 | bDeviceSubClass | 1 | 00h | See interface |
| 6 | bDeviceProtocol | 1 | 00h | See interface. |
| 7 | bMaxPacketSize0 | 1 | 8,16,32,64 | Maximum packet size for endpoint. |
| 8 | idVendor | 2 | ID | Vendor ID. Assigned by the USB-IF. |
| 10 | idProduct | 2 | ID | Product ID. Assigned by manufacturer. |
| 12 | bcdDevice | 2 | BCD | Device release number in binary coded decimal. |
| 14 | iManufacturer | 1 | index | index of string descriptor. |
| 15 | iProduct | 1 | index | index of string descriptor. |
| 16 | iSerialNumber | 1 | index | index of string descriptor. |
| 17 | bNumConfigurations | 1 | 01h | One configuration only for DFU. |
| Offset | Field | Size | Value | Descripton |
|---|---|---|---|---|
| 0 | bLength | 1 | 09h | Size of this descriptor,in bytes. |
| 1 | bDescriptorType | 1 | 04h | INTERFACE descriptor type. |
| 2 | bInterfaceNumber | 1 | Number | Number of this interface. |
| 3 | bAlternateSetting | 1 | 00h | Alternate setting. Must be zero. |
| 4 | bNumEndpoints | 1 | 00h | Only the control pipe is used. |
| 5 | bInterfaceClass | 1 | FEh | Application Specific Class Code. |
| 6 | bInterfaceSubClass | 1 | 01h | Device Firmware Upgrade Code. |
| 7 | bInterfaceProtocol | 1 | 01h | Runtime protocol. |
| 8 | iInterface | 1 | index | Index of string descriptor for this interface. |
| Offset | Field | Size | Value | Descripton |
|---|---|---|---|---|
| 0 | bLength | 1 | 09h | Size of this descriptor,in bytes. |
| 1 | bDescriptorType | 1 | 21h | DFU FUNCTIONAL descriptor type. |
| 2 | bmAttributes | 1 | Bit mask | DFU attributes Bit 7……4: reserved Bit 3: device will perform a bus detach-attach sequence when it receives a DFU_DETACH request. The host must not issue a USB Reset. (bitWillDetach) 0 = no 1 = yes Bit 2: device is able to communicate via USB afeter Manifestation phase.(bitManifestationTolerant) 0 = no, must see bus reset 1 = yes Bit1: upload capable(bitCanUpload) 0 = no 1 = yes Bit0: download capable(bitCanDnload) 0 = no 1 = yes |
| 3 | wDetachTimeOut | 2 | Number | Time,in milliseconds, that the device will wait after receipt of the DFU_DETACH request. if this time elapses without a USB reaset, then the device will terminate the Reconfiguration phase and revert back to normal operation . This repreents the maximum time that the device can wait(depending on its timers, etc.).The host may specify a shorter timeout in the DFU_DETACH request. |
| 5 | wTransferSize | 2 | Number | Maximum number of bytes that the device can accept per control-write transaction. |
| 7 | bcdDFUVersion | 2 | BCD | Numeric expression identifying the version of the DFU Specification release. |
| Offset | Field | Size | Value | Descripton |
|---|---|---|---|---|
| 0 | bLength | 1 | 09h | Size of this descriptor,in bytes. |
| 1 | bDescriptorType | 1 | 04h | INTERFACE descriptor type. |
| 2 | bInterfaceNumber | 1 | Number | Number of this interface. |
| 3 | bAlternateSetting | 1 | 00h | Alternate setting. Must be zero. |
| 4 | bNumEndpoints | 1 | 00h | Only the control pipe is used. |
| 5 | bInterfaceClass | 1 | FEh | Application Specific Class Code. |
| 6 | bInterfaceSubClass | 1 | 01h | Device Firmware Upgrade Code. |
| 7 | bInterfaceProtocol | 1 | 02h | DFU mode protocol. |
| 8 | iInterface | 1 | index | Index of string descriptor for this interface. |