RADIO implements a mechanism for measuring the power in the received signal. This feature is called received signal strength indicator (RSSI).
The RSSI is continuously measured and the value filtered using a single-pole IIR filter. After a signal level change, the RSSI will settle after approximately RSSISETTLE.
Sampling the received signal strength is started by using the RSSISTART task. The sample can be read from the RSSISAMPLE register.
The sample period of the RSSI is defined by RSSIPERIOD. The RSSISAMPLE will hold the filtered received signal strength after this sample period.
For the RSSI sample to be valid, RADIO has to be enabled in RX mode by triggering the RXEN task and the reception has to be started with the READY event followed by START task.