DocID017068 Rev 4

13/26

AN3156

DFU_UPLOAD request commands

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The processing of the DFU_UPLOAD command is shown in Figure 3 and Figure 4.

Figure 3. DFU_UPLOAD request: Device side

Figure 4. DFU_UPLOAD request: Host side

Note:

Before issuing an Upload request, the host has to check that the device is in a correct state

(dfuIDLE or dfuUPLOAD-IDLE state) and that there is no error reported in the status. If the

device is not in the required state/status, the host has to clear any error (DFU_CLRSTATUS

request) and get the new status until the device returns to dfuIDLE state.