UM0290 datasheet(32/76 Pages) STMICROELECTRONICS

32 / 76 page

Device firmware upgrade

UM0290

32/76

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DFU Functional descriptor

This descriptor is identical for both the run-time and the DFU mode descriptor sets.

Table 8.

DFU functional descriptor

Offset

Field

Size

Value

Description

bLength

09h

Size of this descriptor, in bytes.

bDescriptorType

21h

DFU FUNCTIONAL descriptor type.

bmAttributes

00h

DFU attributes:

– Bit7: if bit1 is set, the device will have an

accelerated upload speed of 4096 byes per upload

command (bitCanAccelerate)

0: No

1: Yes

– Bits 6:4: reserved

– Bit 3: device will perform a bus detach-attach

sequence when it receives a DFU_DETACH

request.

0: No

1: Yes

Note: The host must not issue a USB Reset.

(bitWillDetach)

– Bit 2: device is able to communicate via USB after

Manifestation phase (bitManifestation tolerant)

0: No, must see bus reset

1: Yes

– Bit 1: upload capable (bitCanUpload)

0: No

1: Yes

– Bit 0: download capable (bitCanDnload)

0: No

1: Yes

wDetachTimeOut

Number

Time, in milliseconds, that the device waits after

receipt of the DFU_DETACH request. If this time

elapses without a USB reset, then the device

terminates the reconfiguration phase and reverts to

normal operation. This represents 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.

wTransferSize

Number

Maximum number of bytes that the device can accept

per control-write transaction: wTransferSize depends

on the firmware implementation on each MCU.

bcdDFUVersion

011Ah

Version of the STMicroelectronics DFU Extension

specification release.

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