[Discuss-gnuradio] RSSI calculation

[Fengyuan Gong]

Hi, All,

I am a bit confused about RSSI calculation.

In the given verilog code at http://code.ettus.com/redmine/ettus/projects/fpga/repository/revisions/8b377a9d6d0ad281474a8dbff49ea3b093178b28/entry/usrp2/sdr_lib/rssi.v 

I can see RSSI is defined by 16 bits.

But in usrp_prims_common.cc, function usrp_read_aux_adc,

*value = ((v_hi << 2) | ((v_lo >> 6) & 0x3)) << 2; // format as 12-bit

the value is only assigned by 12 bits. I though the value is RSSI. But then it contradicts with format given in the verilog code. Or value is not RSSI?

Any help is appreciated.

Fengyuan