UM0855 datasheet(28/35 Pages) STMICROELECTRONICS

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DFU

UM0855

28/35

Doc ID 16617 Rev 1

DFU

The MEMS DFU (device firmware update) GUI is a graphical interface that allows the user

to download and replace the firmware of a MEMS demonstration board, directly from a PC,

through the USB port.

MEMS demonstration boards that mount an ST72651AR6 microcontroller can reprogram an

application via USB, in accordance with the DFU class specification defined by the USB

Implementers Forum (USB-IF). This capability is useful because it allows the

reprogramming of the microcontroller directly in the field and is particularly well-suited for

USB applications where the same USB connector can be used both for standard operating

mode and for the reprogramming process.

Connector J4 must be shorted to allow the DFU procedure. If the demonstration kit is to be

reprogrammed through the ICP (in-circuit programming) connector and the ST7 dedicated

tools, J4 must be open.

8.1

PC requirements

In order to use the device firmware upgrade (DFU) software with the Windows operating

system, a recent version of Windows (such as Windows 98, Windows 98SE, Windows

Millennium, Windows 2000 or Windows XP) must be installed on the PC.

8.2

DFU procedure

Run the DFU.exe file. To enter the firmware update mode the user must plug the USB cable

into the demonstration kit while pressing the sw2 button on the board (

Figure 3, ref 12).

Figure 18 shows the window displayed when the board has been properly detected.

Figure 18.

Demonstration kit correctly recognized

The DFU driver must be installed before using this feature. The driver can be found in

“firmwareupdate.zip” in the driver installation folder of the demonstration kit.

UM0855 датащи(PDF) 28 Page - STMicroelectronics