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The RSSI value read from the RSSI status register is a 2’s complement number. The following procedure can be used to convert the RSSI reading to an absolute power level (RSSI_dBm).
1) Read the RSSI status register 2) Convert the reading from a hexadecimal number to a decimal number (RSSI_dec) 3) If RSSI_dec ≥ 128 then RSSI_dBm = (RSSI_dec - 256)/2 – RSSI_offset 4) Else if RSSI_dec < 128 then RSSI_dBm = (RSSI_dec)/2 – RSSI_offset
