DFU bootloader commands

AN3156

10/26

DocID017068 Rev 4

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DFU bootloader commands

The DFU_DNLOAD and DFU_UPLOAD requests are mainly used to perform simple Write

Memory and Read Memory operations. They are also used to initiate the integrated

bootloader commands (write, read unprotect, erase, set address, etc.). The

DFU_GETSTATUS command then triggers the command execution.

In the DFU download request the command is selected through the wValue parameter in

the USB request structure. If wValue = 0 then the data sent by the host after the request is a

bootloader command code. The first byte is the command code and the other bytes (if any)

are the data related to this command.

In the DFU upload request the command is selected through the wValue parameter in the

USB request structure. If wValue = 0 then Get Command is selected and performed.