DFU Functional Descriptor

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DFU Functional Descriptor
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.

See Also on BitcoinWiki[edit]