4010-DAAKF-434 Datasheet, PDF (7/14 Pages) Silicon Laboratories – Si4010 KEY FOB DEMO KIT WITH AES CAPABILITY

Si4010-Keyfob-AES-DEMO
3.6. Receiver Board Firmware Description
The Si4313 RX board receives the packets from the Si4010 key fob, and, by the packet headers, it decides what
kind of packet was received. Two packet types can be received: association packets or button press packets. The
Si4313 RX board has two operation modes: Association mode and Button press mode. A key fob can only
associate when the Si4313 RX board is in Association mode. If the Si4313 is in Button press mode, then the
association packet will be discarded. During the first power up, the Si4313 RX board goes into Association mode,
and, after every key fob association, the firmware goes into Button press mode. The board can go back to
Association mode if the PB button is pressed. After an Si4010 key fob associates to the Si4313 RX board, the RX
board can receive the button press packets. At every packet reception, the firmware updates the LCD and sends
an indication message to the PC via the UART interface. The LCD displays the associated key fob serial numbers
and the number of the last button pressed on the key fob. However, the firmware stores more information about
each associated key fob, such as AES keys, temperature, battery level, etc. Figure 5 shows a flow chart of the
receiver board firmware.
Rev 1.1
7