UM1657 datasheet(35/48 Pages) STMICROELECTRONICS

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UM1657

SPIRIT1 DK - GUI description

The button "Sense RSSI" can be used to read the RF power on air according to the center

frequency and the channel filter bandwidth configured. This feature allows knowing also the

RF noise in the environment.

The "RSSI threshold [dBm]" set the threshold of the RSSI. To achieve a good

communication it is important to set in the receiver an RSSI threshold greater than the RX

noise floor.

3.3.1

AES

Selecting the "AES" tab allow the user to make some AES encryption/decryption operation

supported by the SPIRIT1 hardware.

The operations supported are:



Encryption



Derive decryption key



Decryption using a decryption key



Decryption using an encryption key

The Encryption operation is performed following these steps:

Select "Encryption" in AES operation

Type the clear text composed of 128 bits (i.e. 32 hex chars) in the Data input field

Type the encryption key composed of 128 bits (i.e. 32 hex chars) in the Key field

Push "START AES OPERATION" button

The encrypted text is provided as 32 hex chars in Data output

Figure 23. AES Encryption operation

The Derive decryption key operation is performed following these steps:

UM1657 データシート(PDF) 35 Page - STMicroelectronics