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eMotion board installation
UM0979
10/39
DocID017768 Rev 4
Figure 5. Virtual COM port assignment
2.2 DFU
The MEMS STEVAL-MKI109V2 demonstration board is capable of reprogramming an
application through the USB, in accordance with the DFU class specification defined by the
USB Implementers Forum. This capability is useful because it allows reprogramming the
microcontroller directly in the field and is particularly well-suited to USB applications where
the same USB connector can be used both for the standard operating mode and for the
reprogramming process.
In order to configure the eMotion board in DFU mode button SW2 must be pressed before
supplying the board and released when the LEDs D1, D4, D5, and D6 light up.
If the firmware version in use is lower than V3.0.0.0, it’s mandatory to patch the DFU feature
using the “DFU_Patcher_V1.0.2.dfu” file available under the “DFU” folder before proceeding
with the upgrade of the firmware with a version equal to or higher than V3.0.0.0. The
procedure to patch the DFU feature corresponds to the one used during a standard
firmware upgrade with the DFU tool. At the end of this procedure, if the green LED D4 is on,
it indicates that the procedure is successfully completed; if the red LED D5 is on, the
procedure failed and has to be repeated. Before proceeding with the new firmware upgrade
the board must be reset using the SW3 button.