UM0290 datasheet(35/76 Pages) STMICROELECTRONICS

35 / 76 page

UM0290

Device firmware upgrade

35/76

4.5.3

DFU state diagram

Figure 6 summarizes the DFU interface states and the transitions between them. The

events that rigger state transitions can be thought of as arriving on multiple “input tapes” as

in the classic Turing machine concept.

Figure 6.

Interface state transition diagram

Note:

The state transition diagram shown in Figure 6 is almost the same as that defined in the

DFU Class specification (Fig A1 page 28), with the exception of the new transition from state

2 to state 6, which is additional and may or not be implemented in the device firmware.

DFU_DNLOAD

(wLength > 0,

bitCanDnload = 1)

Status Poll Timeout

DFU_GETSTATUS

& Manifest complete

& BitManifestationTolerant=1

Status Poll Timeout,

bitManfestationTolerant = 1

DFU_DNLOAD

EST-SYNC

DFU_DNLOAD

( wLength > 0 )

DFU_GETSTATUS

Status Poll Timeout,

State

DFU_GETSTATUS

DFU_GETSTATE

State

25,9,

10,11

2,3,5,6

9,10

Re-enumeration

DFU_ABORT

Corrupt Firmware

DFU_CLRSTATUS

Any state

(except

0 or 1)

MCU reset

dfuIDLE

BUSY

dfuDNLOAD

SYNC

dfuDN

dfuERROR

state

2,3,5,6,9

DFU_GETSTATUS

& Block complete

dfuDNLO

AD-IDLE

DFU_DNLOAD

wLength=0

DFU_UPLOAD

- SYNC

DFU_UPLOAD

(short Frame)

dfuUPLOAD

dfuMANIF

DFU_GETSTATUS

(Manifest in progress)

dfuMANIF

EST

dfuMANIF

EST-WAIT

RESET

ERROR

app

DETACH

MCU Reset

+ USB Reset

+ DFU mode

selected

appIDLE

DFU_DETACH

Detach timeout

Application Program Mode

BitManifestationTolerant=0

wLength=0

ai14099

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